NJW4162A. 2channel MOSFET Drive Switching Regulator IC for Buck Converter

Transcription

1 channel MOSFET Drive Switching Regulator IC for Buck Converter GENERAL DESCRIPTION The NJW1A is a channel MOSFET Drive switching regulator IC for buck converter that operates wide input voltage range from.3v to V. The oscillating frequency range can set within 1kHz to 1MHz by external resistor. It also has an external synchronous function. It has individual Standby functions, Soft Start functions and Power Good functions for each channel, therefore a start-up control and/or operating condition monitoring are available with a microcomputer. The NJW1A is suitable for a logic voltage generating circuit from high input voltage such as Automotive. Office Automation and Industrial applications. PACKAGE OUTLINE NJW1AVC3 FEATURES Pch MOSFET Driving Driving Voltage -1V(typ.) Maximum Rating Input Voltage 5V Wide Operating Voltage Range.3V to V PWM Control Maximum Duty Cycle 1% Wide Oscillating Frequency Range 1kHz to 1MHz External Synchronization Function 1,5kHz (max.) Anti-Phase switching Adjustable Soft Start Function UVLO (Under Voltage Lockout) Over Current Protection (Hiccup type) Thermal Shutdown Protection Standby Function Power Good Function Package Outline NJW1AVC3 : SSOP-C3 Ver

2 PIN CONFIGURATION 1 HSREG SI1 19 SI OUT OUT PG1 17 N.C. IN GND FB1 15 FB SS1 7 1 IN- EN SS EN 9 1 PG RT 1 11 SYNC (Top View) NJW1AVC3 - - Ver

3 PIN DESCRIPTIONS PIN NAME PIN NUMBER 1 Power Supply pin SI1 SI OUT1 OUT PG1 PG IN-1 IN- FB1 FB SS1 SS EN1 EN RT 1 FUNCTION Current Sensing pin When voltage difference between the pin and the SI pin exceeds 15mV(typ.), over current protection operates. Output pin for Power MOSFET Driving The OUT pin Voltage is clamped with -1V(typ.) at the time of Low level, in order to protect a gate of Pch MOSFET. Power Good pin. An open drain output that goes high impedance when the IN- pin voltage is stable around 1%. Output Voltage Detecting pin Connects output voltage through the resistor divider tap to this pin in order to voltage of the IN- pin become.8v. Feedback Setting pin The feedback resistor and capacitor are connected between the FB pin and the INpin. Soft Start timer setting pin. Soft start time is controlled by a capacitor. Standby Control pin The EN pin internally pulls down with 5k. Normal Operation at the time of High Level. Standby Mode at the time of Low Level or OPEN. Oscillating Frequency Setting pin by Timing Resistor. Oscillating Frequency should set between 1kHz and 1MHz. SYNC 11 External Clock Input pin. The SYNC pin internally pulls down with 5k. It operates by inputting clock signal at the oscillatory frequency that synchronized with the input signal. When not using the external synchronization function, make the SYNC pin the Low level or open. GND 1 GND pin N.C. 17 Non Connection HSREG Output pin of the high side regulator. Connect a bypass capacitor to stabilize a driver circuit. Ver

4 BLOCK DIAGRAM HSREG TSD UVLO EN1 EN RT SYNC 5kW 5kW 5kW Enable Control 1 Enable Control SYNC VREF V B =.8V Logic OSC 3V Regulator Anti Phase PWM1 1V Regulator Logic OCP1 Pulse by Pulse Hiccup Driver1 V IPK1 SI1 OUT1 IN-1 ER AMP1 SS1 Soft Start1 FB1 V IPK PG1 SI Power Good Control Logic OCP Pulse by Pulse Hiccup IN- ER AMP Logic Driver OUT SS Soft Start PWM FB PG Power Good Control Logic GND - - Ver

5 ABSOLUTE MAXIMUM RATINGS (Ta=5 C) PARAMETER SYMBOL MAXIMUM RATINGS UNIT Supply Voltage -.3 to +5 V OUT1, pin Voltage V OUT1, -11 to (*1) V EN1, pin Voltage V EN1, -.3 to +5 V IN-1, pin Voltage V IN-1, -.3 to + V Power Good1, pin Voltage V PG1, -.3 to + V SYNC pin Voltage V SYNC -.3 to + V OUT pin Peak Current I O_PEAK+ 1, (Source) ma I O_PEAK- 1, (Sink) ma Power Dissipation P D SSOP 1, (*) 1,5 (*3) mw Junction Temperature Range Tj - to +15 C Operating Temperature Range T opr - to +15 C Storage Temperature Range T stg -5 to +15 C (*1): When Supply voltage is less than +11V, the absolute maximum rating is -.3 to. (*): Mounted on glass epoxy board. ( mm:based on EIA/JDEC standard, Layers) (*3): Mounted on glass epoxy board. ( mm:based on EIA/JDEC standard, Layers), internal Cu area: 7. 7.mm RECOMMENDED OPERATING CONDITIONS PARAMETER SYMBOL MIN. TYP. MAX. UNIT Supply Voltage.3 V Timing Resistor R T.3 5 k Oscillating Frequency f OSC 1 1, khz Power Good pin Voltage V PG 5.5 V External Clock Input Range f SYNC f OSC 1.1 1,5 (*) khz HSREG Capacitor C HSREG.1. 1 F (*): Use the external synchronization frequency in the range below x of internal oscillating frequency (Maximum: 1.5 MHz). Ver

6 ELECTRICAL CHARACTERISTICS (Unless otherwise noted, =V EN =1V, R T =1k, Common to CH1 and CH, Ta=5 C) PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT Under Voltage Lockout Block ON Threshold Voltage V T_ON = L H V OFF Threshold Voltage V T_OFF = H L V Hysteresis Voltage V HYS 1 15 mv Soft Start Block Charge Current I CHG 8 1 A Oscillator Block Oscillating Frequency f OSC V IN- =.75V, V FB =.7V khz Oscillating Frequency OCP operates f OSC_LIM V IN- =.55V, V FB =.7V 15 khz Error Amplifier Block Reference Voltage V B -1.%.8 +1.% V Input Bias Current I B A Output Source Current I OM+ V FB =V, V IN- =.75V A Output Sink Current I OM- V FB =1V, V IN- =.9V 1 ma PWM Comparate Block Maximum Duty Cycle M AX D UTY V IN- =.75V 1 % Output Block Output High Level ON Resistance R OH I O = -5mA Output Low Level ON Resistance R OL I O = +5mA HSREG Output Current I O_HSREG HSREG pin= 8V 1 15 ma Output pin Limiting Voltage V OLIM V Enable Control Block ON Control Voltage V ON V EN = L H 1.9 V OFF Control Voltage V OFF V EN = H L.5 V Pull-down Resistance R PD_ON/OFF I EN =5 A 5 k Current Limit Detection Block Current Limit Detection Voltage V IPK mv Delay Time t DELAY 1 ns - - Ver

7 ELECTRICAL CHARACTERISTICS (Unless otherwise noted, =V EN =1V, R T =1k, Common to CH1 and CH, Ta=5 C) PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT Power Good Block High Level Detection Voltage V THH_PG % Low Level Detection Voltage V THL_PG % Hysteresis Region V HYS_PG % Power Good ON Resistance R ON_PG I PG =1mA 1 Leak Current at OFF State I LEAK_PG V PG =V.1 A External Synchronization Block High Threshold Voltage V THH_SYNC V Low Threshold Voltage V THL_SYNC.5 V Pull-down Resistance R PD_SYNC 5 k General Characteristics Quiescent Current I DD R L =no load, V IN- =.75V, V FB =.7V ma Standby Current I DD_STB V EN1, =V 1 A THERMAL CHARACTERISTICS PARAMETER SYMBOL VALUE UNIT Junction-to-ambient thermal resistance Junction-to-Top of package characterization parameter ja jt 15 (*) 83 (*5) 13 (*) 9 (*5) (*): Mounted on glass epoxy board. ( mm:based on EIA/JDEC standard, Layers) (*5): Mounted on glass epoxy board. ( mm:based on EIA/JDEC standard, Layers), internal Cu area: 7. 7.mm POWER DISSIPATION vs. AMBIENT TEMPERATURE C/W C/W Power Dissipation P D (mw) NJW1AVC3 Power Dissipation vs. Ambient Temperature (Tj=~15 C) At on layer PC Board At on layer PC Board Ambient Temperature Ta ( C) Ver

8 TYPICAL APPLICATIONS V IN C IN1 C IN C HSREG HSREG SI1 R SENSE1 OUT1 R G1 Q1 L1 V OUT1 CH1 ON/OFF EN1 CH ON/OFF High: ON Low: OFF(Standby) EN FB1 C NF1 R NF1 D1 C OUT1 C FB1 R FB1 R 1 Power Good1 PG1 IN-1 R 11 Power Good PG NJW1A SYNC SI R SENSE R T RT OUT R G Q L V OUT C SS1 SS1 FB C NF R NF D C OUT C FB R FB R C SS SS GND IN- R Ver

9 Oscillating Frequnecny :f OSC (khz) TYPICAL CHARACTERISTICS 1 1 Timing Resistor vs. Oscillating Frequency ( =1V, Ta=5ºC) Timing Resistor :R T (kw) Oscillating Frequency :f OSC (khz) Oscillating Frequency vs. Supply Voltage (R T =1k, V IN -=.75V, V FB =.7V, Ta=5ºC) 1 3 Supply Voltage : (V).81 Reference Voltage vs. Supply Voltage (Ta=5ºC) Quiescent Current vs. Supply Voltage (R L =no load, R T =1k, V IN -=.75V, V FB =.7V, Ta=5ºC) Reference Voltage :V B (V) Quiescent Current :I DD (ma) Supply Voltage : (V) 1 3 Supply Voltage : (V) Error Amplifier Block Voltage Gain, Phase vs. Frequency ( =1V, Gain=dB, Ta=5ºC) 18 Phase Voltage Gain :A V (db) Gain Phase Φ (deg) 1 1k 1k 1k 1M 1M Frequency :f (Hz) Ver

10 TYPICAL CHARACTERISTICS Oscillating Frequency :f OSC (khz) Oscillating Frequency vs Temperature ( =1V, R T =1kW, V IN -=.75V, V FB =.7V) 5 Reference Voltage :V B (V) Reference Voltage vs. Temperature ( =1V).79 Current Limit Detection Voltage :V IPK (mv) Current Limit Detection Voltage vs. Temperature ( =1V) Output pin Limiting Voltage :V OLIM (V) Output pin Limiting Voltage vs. Temperature ( =1V) Output High Level ON Resistance vs. Temperature ( =1V, I O =-5mA) Output Low Level ON Resistance vs. Temperature ( =1V, I O =+5mA) Output High Level ON Resistance : R OH (W) Output Low Level ON Resistance : R OL (W) Ver

11 TYPICAL CHARACTERISTICS Under Voltage Lockout Voltage vs. Temperature.3 1 Charge Current vs. Temperature ( =1V) Threshold Voltage : (V) V T_ON V T_OFF Charge Current :I CHG (μa) ON/OFF Voltage :V ON/OFF (V) Enable Control ON/OFF Voltage vs.temperature ( =1V) V ON V. OFF.. Quiescent Current :I DD (ma) Quiescent Current vs. Temperature (R L =no load, R T =1k, V IN -=.75V, V FB =.7V) =V =1V =.3V 1 Standby Current vs. Temperature (V EN1, =V) Standby Current :I DD_STB (μa) 1 8 =V =1V =.3V Ver

12 MEMO [CAUTION] The specifications on this databook are only given for information, without any guarantee as regards either mistakes or omissions. The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights Ver