TI DCDC Solutions for Handheld and Low Standby Power Devices. Kean Pan Business Development Engineer

Transcription

1 TI DCDC Solutions for Handheld and Low Standby Power Devices Kean Pan Business Development Engineer 1

2 Agenda Challenges for DCDC on Handheld / Low Power Devices DCS-Control Overview and Devices MicroSiP Modules Multi-phase DCDC for Processor Power DCDC for Multi-cell Application Ultra Low Power DCDC 2

3 Challenges for DCDC on Handheld / Low Power Devices Smaller solution size / higher power density Higher efficiency Extends operation time of application Reduces overall system temperature Longer operating and stand-by time Active communication with application, e.g. DVS Lower quiescent current, Snooze Mode Lower solution cost Less external components Smaller external components Lower EMI and system noise No need for filtering Supporting audio, optical and RF systems

4 DCS-Control Overview and Devices 4

5 DCS Control - Stands for High efficiency over the entire load current range Fastest load transient response Seamless transition into Power Save Mode Stable over a large range of output capacitance typ 10uF to 100uF 5

6 Traditional PWM Control Review Internal Compensation OSC = Fixed Frequency PFM Detection Circuitry PFM Circuitry

7 Summary PWM control architecture Complex and silicon intensive (costly) Power Save Mode entry, exit and operation mode circuits Loop compensation required Fixed switching frequency with +/-20% typical tolerance We need something new to reach the next level

8 Basic Hysteretic Control f s Vin Vout Vout ESR Vhys L Vin Switching Frequency Varies and is a Function of ESR, L and Vhys

9 Considerations Hysteretic Control Possibly simplest control circuit Fastest response to input voltage and output voltage perturbations among all control techniques Switching frequency depends on Vhys, L, Vin, Vout and ESR Frequency variation Inherently stable operation Technical items to be solved Modern DC DC converters have no output capacitor ESR Compensate for effects preventing good output voltage accuracy Implementation of Power Save Mode Control or acceptance of switching frequency variation Requires changes to basic hysteretic control

10 TPS62130 Block Diagram

11 DCS-Control Proprietary Ramp Circuitry Feeds VOS (Vout) to Comparator VOS (Vout) FB Feedforward Error Capacitor Amplifier Only Required for Precise for Power DC Save Mode Regulation Mode Performance Hysteretic Comparator for Fast Response to Changes in Output Voltage On Timer for Power Save Mode and Constant Operating Frequency

12 What Does DCS-Control Provide? Superb Transient Response Seamless Transition To Power Save Mode

13 Old versus DCS-Control Triangle Load Sweep (10mA 1.0A) TPS62110 TPS62150 Output voltage Inductor Current Load Current CH1 50mV/div CH2 1A/div CH3 1A/div CH1 50mV/div CH2 1A/div CH3 1A/div No disturbing bursts during the transition between PWM and Power Save Mode

14 How Does DCS-Control Go from Power Save Mode to PWM Mode? DCS-Control = Direct Control with Seamless Transition to Power Save Mode Seamlessly! Operating mode is the same in Power Save Mode and PWM mode, so there is no mode switch -> no possibility for glitch during mode change

15 Transition from Power Save Mode to PWM ~2% Vout Vout 50mV/div Low Output Voltage Dip and Fast Recovery Time ~600 ns & Load Current 1A/div Inductor Current 1A/div SW node Seamless Transition from Power Save Mode with No Overshoot No load to 1A load step with 1uH and 22uF

16 Standard Step down converter Portfolio 300mA-500mA 600mA 1A, 1.2A, 1.6A 2A 3A SOT23, 2x2 SOT23, 2x2 MSOP, 2x2, 3x3 2x2 3x3 1 st Generation L=4.7uH to 10uH TPS62200 TPS62220 TPS62000 TPS62020 TPS nd Generation L=1.0uH to 2.2uH TPS62240 TPS62270*** TPS62260 TPS62290 TPS62060 TPS62065 DCS Control L=1.0uH to 2.2uH Cout up to 100uF TPS62230 TPS62080 TPS62085* TPS62090 Value Devices TPS62560 TPS62590 TLV62080 TLV62065 TLV

17 TPS A High efficiency step down converter Features VIN range from 2.5V to 6V 2.8MHz/1.4MHz switching frequency Adjustable and fixed output voltage options Applications Notebook, Netbook computers Solid State Drive 100% duty cycle mode for lowest dropout 20uA quiescent current in Power Save Mode Output voltage discharge function Adjustable softstart and short circuit protection 10uF to 100uF output capacitance Hard Disk Drive Processor supply Distributed power supplies Battery powered applications Thermal shutdown Package 3x3 QFN package Smallest solution size 2.8MHz with 0.47uH Highest efficiency 1.4MHz with 1uH 17

18 Efficiency [%] Efficiency 1.4MHz, 1.8V output TPS62090 PG 1.0 Vout = 1.8V // Board 2 // 1.4MHz // Hiccup dis. // CL max 1-Eff 2D Iout 25 C Coilcraft XFL4020 4x4x % efficiency at 1mA 90% efficiency at 2A 1uH inductor Iout [A]

19 Efficiency [%] Efficiency 2.8MHz, 1.8V output Coilcraft XFL4020 4x4x2.1 TPS62090 PG 1.0 Vout = 1.8V // Board 2 // 2.8MHz // Hiccup dis. // CL max 1-Eff 2D Iout 25 C % efficiency at 2A 400nH inductor Iout [A]

20 Fastest possible load transient response Load Step 0.2A to 2A Immediate and fastest response to a load step due to 100% switch turn on CH2:Vout, CH4=Iload, CH1=Inductor current 20

21 Seamless transition into Power Save Mode Output voltage ripple <20mV under all conditions CH2:Vout, CH3=Iload, CH4=Inductor current 21

22 Stable from 10uF up to 100uF output capacitance 1uH/10uF 1uH/100uF CH2:Vout, CH4=Iload, CH1=Inductor current Load Step 0.2A to 2A 22

23 TPS A High efficiency step down converter Features Vin range from 2.5V to 6V 3MHz switching frequency Adjustable and fixed output voltage options 100% duty cycle mode for lowest dropout 20uA quiescent current in Power Save Mode 6.5uA quiescent current in SNOOZE Mode Output voltage discharge function 10uF to 100uF output capacitance Thermal shutdown 3x3 QFN package Applications Battery powered applications Distributed power supplies Notebook, Netbook computers 10% efficiency increase with SNOOZE Mode 23

24 60% efficiency at 100uA in SNOOZE Mode 90% efficiency at 0.6A 1uH inductor 24

25 TPS62080 load transient response Only 25mV drop for a 1A load step! 25

26 DCS Control - Stands for High efficiency over the entire load current range Fastest load transient response Seamless transition into Power Save Mode Stable over a large range of output capacitance typ 10uF to 100uF 26

27 MicroSiP TM DC/DC Converters Fully Integrated Power Solutions

28 SiP What is it all about? SiP stands for System in Package, i.e. a multiplicity of devices acting in concert to perform one or more functions unattainable by a single (cost effective) device. The package is the interconnect medium used to create a virtual single device. A SiP approach can offer a significant number of advantages. 1. Smallest solution size : Innovative 3D integration 2. Optimized electrical performance: Comparable efficiency, lower EMI 3. Ease of use: Reduced HW design workload / application issues 4. One stop shopping The advantages coming along with this technology can only be realized if: - The rationale for doing the SiP meets certain criteria. - There is a balance between SiP lamitate area vs. silicon size.

29 Order of Target Customer Preferences 1. Size Solution size >45% smaller compared to discrete solution Less than 1mm height 2. Ease of Use No External Components needed Simplified PCB Layout One-Stop-Shop 1 mm (max) 3. Performance Superior EMI and noise performance Similar feature set and efficiency as discrete DC/DC converters PicoStar TM PicoStar TM

30 TPS82671/x mA Fully Integrated, Low Noise Step-Down Converter in MicroSiP Regulated Switching Frequency: 5.5MHz All required external components are integrated Spread Spectrum, PWM Frequency Dithering, High PSRR and low ripple Power Save Mode Automatic Power Safe Mode transition or forced PWM Mode operation Input voltage: 2.3V to 4.8V Allows < 7mm 2 total solution size, thus provides 90mA/mm 2 One-Stop-Shop, reduced HW design workload and no more questionable designs Supports noise sensitive applications through improved RF spurious performance and radiated noise reduction Allows to choose between high efficiency over entire load range (PSM) or regulated fixed frequency TPS82671 TPS82675 Supports Li-Ion batteries with extended voltage range 1.80 V out, PFM/PWM Mode 1.20 V out, PFM/PWM Mode Cell Phones, Smart-Phones Portable Audio/Video Digital TV, WLAN, GPS and Bluetooth Portable Medical Devices

31 MircoSiP Module Overview Step-Down Converter 1 mm (max) Device Output Voltage [V] Supply Voltage Range [V] Output Current [ma] Features TPS PFM/PWM Mode, Output Cap Discharge, SSM TPS PWM Mode, Output Cap Discharge TPS PFM/PWM Mode, Output Cap Discharge, SSM TPS PFM/PWM Mode, SSM TPS PFM/PWM Mode, Output Cap Discharge, SSM TPS PFM/PWM Mode, SSM TPS PFM/PWM Mode, SSM TPS PFM/PWM Mode, Output Cap Discharge, SSM TPS PFM/PWM Mode, Output Cap Discharge, SSM TPS PFM/PWM Mode, Output Cap Discharge TPS PFM/PWM Mode, Output Cap Discharge Boost Converter Device Output Voltage [V] Supply Voltage Range [V] Output Current [ma] Features SSM = Spread Spectrum Modulation TPS PFM/PWM Mode, Load Disconnect

32 Multi-phase DCDC for Processor Power 32

33 process node [nm] App Processor Trends Process node scaling nm 60nm 45nm 28nm Higher clock rates and SoC integration Driven by performance need Marketing driven Reduced process scale: Increased leakage Higher process variation Reduced V DD and wider distribution Reduced parasitic gate capacitance overcompensated by Increased gate # Higher clock rates Battery technology Does not keep pace New batteries: Ever increasing power demand P P P f(v ) f(c,#,f,v ) 2 static dynamic DD Gate CR DD 33

34 Efficiency Key Focus: High Efficiency Operation PFM 1-ph Power Stage PWM 2-ph Power Stages PFM Split Power Stage PWM 1-ph Power Stage high efficiency operation over the complete load range Ultra Light load: PFM split power stage. Parasitic FET gate capacitance is kept at minimum number for lowest currents Light load: single phase PFM operation. PFM maintains high efficiency conversion. Medium load: single phase PWM operation Small R DS,on FETs keep efficiency high at medium loads Load Current High load: multi-phase PWM operation Phases operate in parallel. The effective R DS,on is divided by the number of phases. In addition, losses in the inductor are kept as small as possible since the DCR is divided as well. Incorporated Charge-Pump Si-Anode low-vin efficiency boost/ process variation /peak output current efficiency boost

35 Key Focus: Smallest Solution Size Smallest solution size is achieved by Stand-alone concept: compared to PMICs, decoupling caps can be saved, placement can be optimized Small input and output capacitors Cancelling additional external components Enabling smallest inductors Single phase: allowing tiniest inductors by high frequency operation and current limits optimized for choosing tiny inductors Multi phase: The multi-phase technology allows for choosing smallest inductors with small saturation currents. The overall size of the n inductors is smaller than a single inductor with an according saturation current would be. Still, smaller effective DCRs can be achieved keeping inductor losses small by putting them in parallel. Height requirements (<1.2mm, <1.0mm, <0.8mm) can be met. Volume Factor 4 for 2x current. ½ I (0.47uH) vs. I (0.47uH) Volume Factor 2 for 2x current for ½ inductance ½ I (0.47uH) vs. I (0.2uH) 35

36 Multi phase vs. two inductors in parallel To achieve smallest solution size, tiny inductors are a must. Tiny inductors come with limited saturation current ratings. So why not putting simply two inductors in parallel to overcome height constrains? DCR variation causes inductor current to be unequally distributed. A PCB temperature gradient might enforce this effect Efficiency suffers since the seen DCR is not DCR/2 An inductor might run into saturation. A higher saturation current is required, increasing solution size No phase shedding feasible No phase inversed operation possible Regulation bandwidth limitation On TPS6238xx solutions, the current is actively balanced The efficiency benefits from both DCR and RDS,on in parallel reducing losses by 50% for two phases and by 66% for three phases Automatic phase shedding allows highest efficiency over the complete output current range The output voltage ripple is minimized by phase inverted operation EMI and input ripple are minimized by phase inverted operation The effective regulation bandwidth is increased with the number of phases Balancing and precise current limits allow the choice of tiniest inductors 36

37 TPS62385x Overview 4.7A 2-Phase Step-Down Converter Highest Efficiency Reduced Inductor and On-Chip losses by Multi Phase Design SmartRail Technology for highest Efficiency over the whole Load Range Integrated Charge Pump for low Battery Efficiency Boosting Low R DS,on Switches and Active Rectifiers Automatic dual-to-single Phase Transition Power Save Mode for Light Load Efficiency I²C High Speed Compatible Interface Excellent DC and AC Output Voltage Regulation Differential Load Sensing Multiplied Regulation Bandwidth by Multi Phase Design Precise DC Output Voltage Accuracy Reduced Output Voltage Ripple by 180 -Phase Shifted Operation Multiple Robust Operation and Protection Features Soft Start with 500μs Startup Time Power Good Indication Programmable Slew Rate at Voltage Transition Low Battery Voltage Ripple by Phase Shifted Operation Over Temperature Monitoring and Protection with programmable thresholds Input Under Voltage Detection and Lockout Output Current Limit and Protection 7-bit SAR ADC for Output Current Monitoring Interrupt Signal for Exception Handling Programmable Output Voltage 10mV Steps 0.5V to 1.77V Optional: VOUT can be analog controlled via VSEL 2.22mm x 2.44mm chip size 0.5mm pitch Enables low cost board version Best for power trace routing

38 TPS62386x Overview 6.8A 2-Phase Step-Down Converter Highest Efficiency Reduced Inductor and On-Chip losses by Multi Phase Design SmartRail Technology for highest Efficiency over the whole Load Range Integrated Charge Pump for low Battery Efficiency Boosting Low R DS,on Switches and Active Rectifiers Automatic dual-to-single Phase Transition Power Save Mode for Light Load Efficiency I²C High Speed Compatible Interface Excellent DC and AC Output Voltage Regulation Differential Load Sensing Multiplied Regulation Bandwidth by Multi Phase Design Precise DC Output Voltage Accuracy Reduced Output Voltage Ripple by 180 -Phase Shifted Operation Multiple Robust Operation and Protection Features Soft Start with 500μs Startup Time Power Good Indication Programmable Slew Rate at Voltage Transition Low Battery Voltage Ripple by Phase Shifted Operation Over Temperature Monitoring and Protection with programmable thresholds Input Under Voltage Detection and Lockout Output Current Limit and Protection 7-bit SAR ADC for Output Current Monitoring Interrupt Signal for Exception Handling Programmable Output Voltage 10mV Steps 0.5V to 1.77V Optional: VOUT can be analog controlled via VSEL 2.22mm x 2.44mm chip size 0.5mm pitch Enables low cost board version Best for power trace routing

39 TPS62387x Overview 7.8A 2-Phase Step-Down Converter Highest Efficiency Reduced Inductor and On-Chip losses by Multi Phase Design SmartRail Technology for highest Efficiency over the whole Load Range Integrated Charge Pump for low Battery Efficiency Boosting Low R DS,on Switches and Active Rectifiers Automatic dual-to-single Phase Transition Power Save Mode for Light Load Efficiency I²C High Speed Compatible Interface Excellent DC and AC Output Voltage Regulation Differential Load Sensing Multiplied Regulation Bandwidth by Multi Phase Design Precise DC Output Voltage Accuracy Reduced Output Voltage Ripple by 180 -Phase Shifted Operation Multiple Robust Operation and Protection Features Soft Start with 500μs Startup Time Power Good Indication Programmable Slew Rate at Voltage Transition Low Battery Voltage Ripple by Phase Shifted Operation Over Temperature Monitoring and Protection with programmable thresholds Input Under Voltage Detection and Lockout Output Current Limit and Protection 7-bit SAR ADC for Output Current Monitoring Interrupt Signal for Exception Handling Programmable Output Voltage 10mV Steps 0.5V to 1.77V Optional: VOUT can be analog controlled via VSEL 2.22mm x 2.44mm chip size 0.5mm pitch Enables low cost board version Best for power trace routing

40 DCDC for Multi-Cell Applications 40

41 DCS-Control Step-Down Converter V IN MAX >6V Vin Vout Iout L - C Package Solution Size [mm 2 ] * Features TPS to 15V ADJ, 2.0V TPS to 17V ADJ, 1.8V 75mA 22uH/4.7uF 3x3 SOT 30 Iq=11uA, EN, PG, 2x2 SON (TPS62122), DCS-Control TM 300mA 10uH/10uF 2x2 SON 40 Iq=11uA, Adj. EN, PG, DCS-Control TM Pin to Pin Compatible TPS to 17V ADJ, 1.8, 3.3, 5.0V TPS to 17V ADJ, 1.8, 3.3, 5.0V TPS to 17V ADJ, 1.8, 3.3, 5.0V TPS to 17V ADJ, 1.8, 3.3, 5.0V TPS to 17V ADJ, 1.8, 3.3, 5.0V 3.0 A 1uH/22uF 3x3 QFN 95 Iq=17uA, EN, PG, FSW, DEF, SS/TR, DCS-Control TM 2.0A 1uH/22uF 3x3 QFN 95 Iq=17uA, EN, PG, FSW, DEF, SS/TR, DCS-Control TM Pin to Pin Compatible 1.0A 1uH/22uF 3x3 QFN 85 Iq=17uA, EN, PG, FSW, DEF, SS/TR, DCS-Control TM 1.0A 2.2uH/22uF 2x2 SON 45 Iq=17uA, EN, PG, DCS-Control TM 0.5A 2.2uH/22uF 2x2 SON 45 Iq=17uA, EN, PG, DCS-Control TM * Estimated Total Solution Size based on EVM layout for fixed V OUT, incl. C IN, C OUT and L

42 TPS6216x/17x Tiny 17V 0.5A/1A Step-Down Converter in 2x2 WSON Released: November 2011 DCS-Control topology: fast AC line and load transient response plus seamless transition into Power Save Mode Supports high Output Capacitance of up to 200uF Works with small inductor and low ESR capacitors 100% Duty Cycle and 17uA typ. Quiescent Current Power Good Output Maintains a stable and accurate output voltage Robust design through supporting many L-C combinations and on board capacitance Allows cost efficient external components and supports a total solution size of 45mm2 Enables extended application run time through lowest dropout and power consumption Indicates output voltage condition, e.g. for system communication like startup sequencing. General Purpose Point-of-Load Industrial Applications, e.g. PLC, measurement DSC Camera Enterprise Solid-state drives Low power DSP core applications Computing TPS62160EVM-627 TPS62170EVM-627

43 TPS62130/40/50: 3-17V V IN, 1-3A, 2.5MHz Step-Down Converters in 3x3mm QFN Released: November 2011 High Efficiency Step Down Converter with DCS-Control TM VIN range from 3 to 17V Adjustable VOUT from 0.9 to 6.0V Fixed VOUT options: 1.8V, 3.3V, 5.0V Output current up to: 3A (TPS62130) 2A (TPS62140) 1A (TPS62150) Seamless transition to Power Save Mode Pin-selectable switching frequency (full, half) 100% Duty Cycle Mode Programmable Soft Start and Tracking Quiescent current of 17uA (typ.) Power Good (3.. 17)V 10uF High VIN step down converter with small solution size 3.3V / 3A utilizing a 1uH inductor DCS-Control TM regulation is fast and accurate Low quiescent current and selectable switching frequency for high efficiency VFB control allows current source applications 3.3nF PVIN AVIN EN TPS62131 SS/TR DEF FSW SW VOS PG FB AGND PGND 1μH 100k 1.8V / 3A 22uF General Purpose POL Solid State Disk Drives Embedded and mobile Computing Industrial applications Cstart TR Adjustable Startup FB Voltage Control DEF FSW Pin Selectable Output Voltage Pin Selectable Switching Frequency TPS62130EVM-505 TPS62140EVM-505 TPS62150EVM-505

44 TLV6213x/5x: V V IN, 3/1A, Step-Down Converters in 3x3mm QFN High Efficiency Step Down Converter with DCS-Control TM VIN range from 4 to 17V Adjustable VOUT from 0.9 to 5.0V Output current up to: 3A (TLV62130) 1A (TLV62150) Seamless transition to Power Save Mode Pin-selectable switching frequency (full, half) 100% Duty Cycle Mode Programmable Soft Start. Quiescent current of 17uA (typ.) Power Good (3.. 17)V 10uF High VIN step down converter with small solution size 3.3V / 3A utilizing a 1uH inductor DCS-Control TM regulation is fast and accurate Low quiescent current and selectable switching frequency for high efficiency VFB control allows current source applications 3.3nF PVIN AVIN EN TPS62131 SS/TR DEF SW VOS PG FB AGND 1μH 100k 1.8V / 3A 22uF FSW PGND General Purpose POL Cstart TR Adjustable Startup FB Voltage Control FSW Pin Selectable Switching Frequency Solid State Disk Drives Embedded and mobile Computing Industrial applications

45 Ultra Low Power DC DC Product Overview + Roadmap 45

46 Ultra Low Power - Product Status TPS62120 Industry's first commercial successful energy harvester in full production Iq=11uA CC430 solar demonstrator TPS61251 adjustable current limit boost converter with 2uA Snooze mode TPS62730 CC2540 Companion Step Cown Converter with 30nA standby mode TPS mA Step down Converter with 6uA EN comparator 46

47 Ultra low power device line up (RTM ed) DC/DC Topology VIN IOUT Key Features Package Application TPS62120 TPS62122 Step Down 2V 15V 75mA Iq = 11uA, DCS- Control TM 2x2 SON, SOT23-8 Self powered wireless switch, embedded processing, Low Power RF TPS62730 Step Down 1.9V 3.9V 100mA Iq 30nA in Bypass, 22uA in DC/DC mode, DCS-Control TM 1x1.5 SON Low Power RF companion DC/DC for CC2540/41, CC430, CC1120 etc. TPS62125 Step Down 3V 17V TPS61220 boost 0.7V 5.5V TPS61251 boost 2.3V 6.0V 300mA 200mA SW limit 6uA Iq Input SVS, 13uA Iq active, VO 1.2V to 10V, DCS- Control TM 2x2 SON 8 Embedded processing, current loops, energy harvesting, 4 cell alkaline powered sensors Iq 5.5uA SC cell alkaline powered application e.g. sensors 2uA Iq snooze mode, 100mA - 1.5A programmable input current limit 2x2 SON Low Iq buffer cap charger 47

48 TPS62730 (TPS_Radio) 100mA DC/DC solution with Bypass Mode Selectable or Automatic Transition from DC/DC to bypass mode Up to 95% Efficiency, 25uA (typ.) Quiescent Current and 30nA (typ.) Shutdown Current Excellent low Output Voltage Ripple DCS-Control topology Package: 1mm x 1.5mm QFN and 0402 caps, 0603 inductor Extends application run time by up to 20% Support reduction of total power consumption from battery Makes this device ideal for RF applications Enables seamless transition into Power Save Mode and excellent transient and AC load regulation Small external components and small IC package allow for solution size of <12mm 2 BLE (Bluetooth Low Energy) MSP430 and alike controller supply HVAC (Heating, Ventilating, and Air Conditioning) VIN RF4CE (ZigBee) 1.9V - 3.9V Metering Smoke Detectors C 2.2 IN µf ON BYP VIN GND TPS62730EVM-726 TPS62730 ON/BYP SW VOUT STAT L 2.2mH C 2.2 OUT µf VOUT 2.1V

49 TPS62120, TPS V to 15V Input, 75mA I out, 96% efficiency Step-Down Converter High efficiency in PFM mode 2.5V Rising / 1.85V Falling UVLO Thresholds Wide UVLO hysteresis window allows the storage of energy in,, C IN until there is enough for the converter to efficiently transfer, to the output avoiding short cycling during buck power-up Active Discharge Capacitor (TPS62120), Power Good pin (TPS62120) SOT-23-8 (TPS62120), 2x2 QFN (TPS62122) Above 70% 100uA Allows time control for power sequencing & a clear and sharp start up voltage. Notification of output voltage being regulated when V out is greater than 95% of the nominal value Multiple solar cells Inductive energy harvesters Low Power RF Applications Low Power Microprocessor Industrial sensing (12V bus) TPS62122EVM-586 TPS62120EVM-640

50 High Efficiency Above 100µA for 10V IN

51 Proper start up from weak source 5V 300uA Solar Module 600 Lux C 100 store µ F C 4.7 IN µ F TPS62120 vs. TPS62231 L COUT 4.7 µ F V OUT =1.8V Load 100R TPS62120 UVLO hysteresis ~ 600mV TPS62231UVLO hysteresis ~100mV Runtime ~ 4ms -> 130uWs Energy Runtime ~ 400us -> 13uWs Larger UVLO Hysteresis more energy can be extracted from the storage capacitor

52 TPS62125 Released: May mA Step-Down Converter with Adjustable Enable Threshold and Hysteresis Adjustable ENABLE threshold and hysteresis DCS-Control topology High efficiency over entire load and supply voltage range Wide input voltage range: 3V - 17V 100% Duty Cycle for Lowest Dropout Extend application run-time through high design flexibility Maintains a stable output voltage through a fast AC line and load transient response Increases Efficiency at very light loads (>60% at 100uA) Allows to capture the entire energy from the harvester; tolerates multiple different supply types Achieves longest run-time by allowing the application to operate close to the input voltage level Energy Harvesting supplies Battery applications: 4x Alkaline or 2-4 Li-Ion cells 9V 15V bus voltage rails Embedded Processing Inverter (negative VOUT) TPS62125EVM-044

53 TPS62125 Programmable EN Comparator Precise (3%) programmable start up threshold setting Only 6uA quiescent current consumption EN comparator with internal 50mV hysteresis Increasing hysteresis with external resistor on EN-hys pin VIN VIN_startup DC/DC ON Hysteresis VIN VIN ON/ SHDN VREF VOUT V IN_stop DC/DC OFF R EN1 R EN2 EN REF EN_hys EN Comparator Proper VOUT ramp up R EN HYS GND

54 Thank you 54