General Description The is a 1.1MHz fixed frequency, current mode, PWM synchronous buck (step-down) DC-DC converter, capable of driving a 800mA load with high efficiency, excellent line and load regulation. The device integrates a main switch and a synchronous switch without an external Schottky diode. It is ideal for powering portable equipment that runs from a single Li-ion battery. A standard series of inductors are available from several different manufacturers optimized for use with the. This feature greatly simplifies the design of switch-mode power supplies. This IC is available in TSOT-23-5, MSOP-10 and DFN-2 2-6(1) packages. Features High Efficiency: up to 95% Output Current: 800mA Input Voltage Range: 2.5V to 5.5V Fixed 1.1MHz Frequency Current Mode Control 100% Duty Cycle in Dropout Built-in Short Circuit Protection Built-in Thermal Shutdown Function Built-in Current Limit Function Shutdown Current: <1µA Applications GPS WiFi Card Portable Media Player Digital Still and Video Cameras TSOT-23-5 MSOP-10 DFN-2 2-6(1) Figure 1. Package Types of 1
Pin Configuration KT Package MM Package DN Package TSOT-23-5 MSOP-10 DFN-2 2-6(1) P in 1 Mark EN GND 1 2 5 FB VIN NC GND 1 2 3 10 9 8 PGND SW EN NC EN 1 2 6 5 FB GND SW 3 4 VIN NC FB 4 7 5 6 NC NC VIN 3 4 SW Figure 2. Pin Configuration of (Top View) Pin Description Pin Number TSOT-23-5 MSOP-10 DFN-2 2-6(1) Pin Name 1 8 2 EN 2 3 5 GND Ground pin Function Control input pin. Forcing this pin above 1.5V enables the IC. Forcing this pin below 0.6V shuts down the IC. When the IC is in shutdown mode, all functions are disabled to decrease the supply current below 1µA 3 9 4 SW Power switch output pin. Inductor connection to drain of the internal PFET and NFET switches 4 1 3 VIN Supply input pin. Bypass to GND with a 10µF or greater ceramic capacitor 5 5 6 FB Feedback pin. Connect it with an external resistor divider network to program the system output voltage 2, 4, 6, 7 1 NC No connection 10 PGND Power ground pin 2
Functional Block Diagram Ordering Information Figure 3. Functional Block Diagram of - Circuit Type Package KT: TSOT-23-5 MM: MSOP-10 DN: DFN-2 2-6(1) G1: Green TR: Tape & Reel ADJ: Adjustable Voltage Package Temperature Range Part Number Marking ID Packing Type TSOT-23-5 KT-ADJTRG1 L2A Tape & Reel MSOP-10-40 to 85 C MM-ADJTRG1 3406AMM-G1 Tape & Reel DFN-2 2-6(1) DN-ADJTRG1 BA Tape & Reel BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant and green. 3
Absolute Maximum Ratings (Note 1) Parameter Symbol Value Unit Input Voltage -0.3 to 6 V Feedback Voltage V FB -0.3 to +0.3 V EN Pin Voltage V EN -0.3 to +0.3 V SW Pin Voltage V SW -0.3 to +0.3 V TSOT-23-5 250 Thermal Resistance θ JA MSOP-10 135 ºC/W DFN-2 2-6(1) 100 Operating Junction Temperature T J 150 ºC Storage Temperature T STG -65 to 150 ºC Lead Temperature (Soldering, 10sec) T LEAD 260 ºC Note 1: Stresses greater than those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions is not implied. Exposure to Absolute Maximum Ratings for extended periods may affect device reliability. Recommended Operating Conditions Parameter Symbol Min Max Unit Input Voltage 2.5 5.5 V Maximum Output Current I OUT (MAX) 800 ma Operating Ambient Temperature T A -40 85 ºC 4
Electrical Characteristics =V EN =3.6V, T A =25, unless otherwise specified. Specifications with boldface type apply over full operating temperature range from -40 to 85ºC. Parameters Symbol Conditions Min Typ Max Unit Supply Current I CC V FB =0.55V 400 600 µa Shutdown Supply Current I SHDN V EN =0V, =5.5V 0.01 1 µa Under Voltage Lockout Threshold Under Voltage Lockout Hysteresis V UVLO Rising edge 2.27 V V HUVLO 200 mv Feedback Bias Current I FB V FB =0.65V -50 0.5 50 na Feedback Voltage V FB I OUT =100mA Maximum Output Current I OUT (MAX) =2.5V, =0.9V =3.6V, =1.2V =4.6V, =3.3V 0.588/ 0.582 0.600 0.612/ 0.618 Switch Current Limit I LIM V FB =0.55V 0.95 1.25 A Oscillator Frequency f OSC 0.8 1.1 1.4 MHz 800 800 800 V ma EN Pin Threshold V ENL 0.6 V ENH 1.5 V EN Pin Input Leakage Current Internal PFET On Resistance Internal NFET On Resistance I H V EN =3.6V -0.1 0.1 µa I L V EN =0V -0.1 0.1 µa R DSONP I SW =100mA 0.44 Ω R DSONN I SW =-100mA 0.29 Ω Maximum Duty Cycle D MAX V FB =0.55V 100 % Soft-start Time Thermal Shutdown Threshold Thermal Shutdown Hysteresis T SS V EN =0V to I OUT =50mA 220 µs T OTSD 160 ºC T HYS 30 ºC 5
Typical Performance Characteristics L=10µH, C IN =C OUT =10µF, T A =25 o C, unless otherwise noted. 1.4 0.7 1.3 0.6 Frequency (MHz) 1.2 1.1 1.0 0.9 =3.6V =1.8V I OUT =0A Supply Current (ma) 0.5 0.4 0.3 =3.6V V FB =0.55V 0.8 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 Input Voltage (V) 0.2-60 -40-20 0 20 40 60 80 100 120 140 160 Temperature ( o C) Figure 4. Frequency vs. Input Voltage Figure 5. Supply Current vs. Temperature 2.0 2.0 1.8 1.8 1.6 1.6 Current Limit (A) 1.4 1.2 1.0 0.8 Output Voltage (V) 1.4 1.2 1.0 0.8 0.6 0.6 0.4 0.2 =3.6V V FB =0.55V 0.4 0.2 =3.6V =1.8V 0.0-60 -40-20 0 20 40 60 80 100 Temperature ( O C) 0.0 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 Output Current (A) Figure 6. Current Limit vs. Temperature Figure 7. Output Voltage vs. Output Current 6
Typical Performance Characteristics (Continued) 400ns/div V SW 2V/div 20mV/div V SW 2V/div 20mV/div 400ns/div 400ns/div Figure 8. Light Load Operation Figure 9. Heavy Load Operation ( =3.6V, =1.8V, I OUT =0mA) ( =3.6V, =1.8V, I OUT =800mA) I OUT 500mA/div 100mV/div I IN 500mA/div 2V/div V EN 2V/div 200µs/div 400µs/div Figure 10. Load Transient Figure 11. Start up from Shutdown ( =3.6V, =1.8V, I OUT =0mA to 800mA) ( =3.6V, =1.8V, R LOAD =2.5Ω) 7
Typical Performance Characteristics (Continued) 1V/div V SW 2V/div I L 1A/div 1V/div V SW 2V/div I L 1A/div 10µs/div 40µs/div Figure 12. Short Circuit Protection Figure 13. Short Circuit Recovery ( =3.6V, =1.8V, no load) ( =3.6V, =1.8V, no load) 1.0 1.0 0.9 0.9 Efficiency (%) 0.8 0.7 0.6 0.5 0.4 TSOT-23-5 MSOP-10 Efficiency (%) 0.8 0.7 0.6 0.5 0.4 TSOT-23-5 MSOP-10 0.3 0.2 0.1 =3.6V =1.8V L=10µH 0.3 0.2 0.1 =4.2V =3.3V L=10µH 0.0 0.1 1 0.0 0.1 1 Output Current (A) Output Current (A) Figure 14. Efficiency vs. Output Current Figure 15. Efficiency vs. Output Current 8
Typical Performance Characteristics (Continued) 2.0 Normalized Feedback Voltage (%) 1.5 1.0 0.5 0.0-0.5-1.0-1.5 =3.6V =1.8V -2.0-60 -40-20 0 20 40 60 80 100 Temperature ( o C) Figure 16. Normalized Feedback Voltage vs. Temperature Typical Application 150k R2 300k R1 2.5V to 5.5V C IN 10µF EN FB VIN -ADJ GND SW L 10µH C OUT 10µF 1.8V 800mA Figure 17. Typical Application of 9
Mechanical Dimensions TSOT-23-5 Unit: mm(inch) 5 GAUGE PLANE 10
Mechanical Dimensions (Continued) MSOP-10 Unit: mm(inch) 11
Mechanical Dimensions (Continued) DFN-2 2-6(1) Unit: mm(inch) 1.900(0.075) 2.100(0.083) 0.200(0.008) MIN. 0.650(0.026) N4 TYP. N5 N6 0.224(0.009) 0.376(0.015) 1.500(0.059) 1.700(0.067) 1.900(0.075) 2.100(0.083) 0.850(0.033) 1.050(0.041) Pin 1 Mark PIN #1 IDENTIFICATION See DETAIL A N3 N2 N1 0.250(0.010) 0.350(0.014) 0.000(0.000) 0.050(0.002) DETAIL A 2 1 2 1 2 1 0.550(0.022) 0.650(0.026) 0.152(0.006) REF. Pin 1 options 12
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