NJU7632 Step-Down switching regulator IC with standby function GENERAL DESCRIPTION The NJU7632 is a low voltage operation high-speed switching regulator control IC for step-down converter, with a standby function. It incorporates a totem pole output, which can drive an external MOS-FET easily. The NJU7632 also has a soft-start function, dead time control and timer latch for short circuit protection and their times are all adjustable with external parts. Further the internal standby function minimize the current during non-active condition. It is available in a small and thin 8-lead MSOP (TVSP) package, and it is suitable for battery powered applications. PACKAGE OUTLINE FEATURES PWM switching control Standby Function Operating Voltage Wide Oscillator Range Maximum Duty Cycle Quiescent Current PRODUCT VARIATION NJU7632RB1 (MSOP8 (TVSP8)) NJU763x** 2.2V to 8V 300kHz to 1MHz 100% Operating :800A typ. Standby :1A max. Internal :16ms typ. or adjustable Soft-Start Function Dead Time Control Timer Latch for Short Circuit Protection C-MOS Technology Package Outline NJU7632RB1 : MSOP8 (TVSP8)* Standby Terminal NJU7632 Standby Function NJU7630 PWM Control ** Planning *MEET JEDEC MO-187-DA / THIN TYPE PIN CONFIGURATION 1 8 2 7 3 6 4 5 NJU7632RB1 Ver.2012-08-03 PIN FUNCTION 1. OUT 2. V+ 3. FB 4. IN5. SCP 6. DTC 7. RT 8. GND -1- NJU7632 BLOCK DIAGRAM + V FB 0.8V ERAMP IN1V 0.2V Vref Soft Start UVLO Latch PWM Buffer 2A SCP OUT SCP OSC 2k 0.5V 0.5 1V RT A Standby ON/OFF 1V DTC + RT V RT GND RP ON/OFF High: ON Low : OFF (Standby) -2- Ver.2012-08-03 NJU7632 ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL Supply Voltage V+ Output Pin Current IO Power Dissipation PD Operating Temperature Range TOPR Storage Temperature Range TSTG MAXIMUM RATINGS +9 50 MSOP8 (TVSP8) :320 -40 to +85 -40 to +125 RECOMMENDED OPERATING CONDITIONS PARAMETER SYMBOL MIN. Operating Voltage V+ 2.2 Oscillator Timing Resistor RT 30 Oscillation Frequency fOSC 300 TYP. - 47 700 Under Voltage Lockout Block ON Threshold Voltage OFF Threshold Voltage Hysteresis Voltage Soft Start Block Soft Start Time Short Circuit Protection Block Input Threshold Voltage Charge Current Latch Mode ON Threshold Voltage Latch Mode OFF Threshold Voltage Oscillator Block RT Pin Voltage Oscillation Frequency Oscillate Supply Voltage Fluctuations Oscillate Temperature Fluctuations Standby RT Terminal Resistance Ver.2012-08-03 MAX. 8 120 1,000 (Ta=25C) UNIT V k kHz (V+=3.3V, RT=47k, Ta=25C) ELECTRICAL CHARACTERISTICS PARAMETER (Ta=25C) UNIT V mA mW C C SYMBOL VT_ON VT_OFF VHYS TSS TEST CONDITION V+= L H V+= H L VT_ON Duty=80% MIN. TYP. MAX. UNIT 1.9 1.8 60 2.0 1.9 100 2.1 2.0 - V V mV 8 16 24 ms VT_PC ICHG FB Pin VSCP=0V 0.95 1.5 1.00 2 1.05 2.5 V A VT_LA SCP Pin 0.95 1.00 1.05 V VT_LAOFF SCP Pin 0.2 0.45 0.7 V -5% 630 0.5 700 +5% 770 V kHz VRT fOSC fDV V+=2.2V to 8V - 1 - % fDT Ta=-40C to +85C - 3 - % - 2 - M RT_STB -3- NJU7632 (V+=3.3V, RT=47k, Ta=25C) ELECTRICAL CHARACTERISTICS PARAMETER Error Amplifier Block Reference Voltage Input Bias Current Open Loop Gain Gain Bandwidth Product Output Source Current Output Sink Current SYMBOL TEST CONDITION VB IB AV GB IOM+_1 IOM+_2 IOM- VFB=1V, VIN-=0.9V VFB=1V, VIN-=0.9V, V+=2.2V VFB=1V, VIN-=1.1V MIN. TYP. MAX. UNIT -1.0% -0.1 - - 20 4 0.10 1.00 - 80 1 45 9 0.16 +1.0% 0.1 - - 70 16 0.22 V A dB MHz mA mA mA 0.16 0.44 100 40 0.22 0.5 - 50 0.28 0.56 - 60 V V % % PWM Complete Block Input Threshold Voltage Maximum Duty Cycle Output Block Output High Level ON Resistance Output Low Level ON Resistance General Characteristics Quiescent Current Standby Quiescent Current -4- VT_0 VT_50 MAXDUTY_1 MAXDUTY_2 Duty=0% Duty=50% VFB=0.9V VFB=0.9V, RDTC=47k ROH IO=-20mA - 10 20 ROL IO=+20mA - 5 10 RL=Non Load RT=Open - - 800 - 1200 1.0 A A IDD IDD_STB Ver.2012-08-03 NJU7632 TYPICAL APPLICATIONS Step-Down Converter FET L VIN VOUT SBD CIN COUT R2 R1 NJU7632 1 OUT GND 8 RP RT + 2 V 3 FB C RT 7 DTC 6 CS CNF RNF Ver.2012-08-03 4 IN- SCP RDTC 5 CSCP ON/OFF High: ON Low : OFF (Standby) -5- NJU7632 TYPICAL CHARACTERISTICS Oscillation Frequency fosc (kHz) 1000 100 Timing Resistance RT (k) 720 700 680 660 Duty Cycle vs. R DTC T Reference Voltage V (V) B 60 40 20 0 20 40 60 80 100 Dead Time Control Resistance RDTC (k) Voltage Gain Av (dB) 1.002 1 0.998 0.996 0 2 4 6 8 Operating Voltage V+ (V) Error Amplifier Block Voltage Gain, Phase vs. Frequency + o (V =3.3V, Gain=40dB, Ta=25 C) 60 45 Phase 135 Gain 90 15 45 1 10 100 1000 Frequency f (kHz) 10 180 30 0 0.1 -6- 10 (Ta=25oC) 1.004 80 0 2 4 6 8 Operating Voltage V+ (V) (V =3.3V, R =47k, Ta=25 C) AX Duty Cycle M D UTY (%) 100 0 Reference Voltage vs. Operating Voltage o + (RT=47k, Ta=25oC) 740 Phase (deg) Oscillation Frequency f 100 10 Oscillation Frequency vs. Operating Voltage (V+=3.3V, Ta=25oC) OSC (kHz) Oscillation Frequency vs. Timing Resistance 0 10000 Ver.2012-08-03 NJU7632 TYPICAL CHARACTERISTICS Quiescent Current vs. Operating Voltage Standby Current vs. Operating Voltage o (R =47k, R =Non Load, Ta=25 C) T (nA) Standby Current I 1000 800 600 400 200 2 4 6 8 Operating Voltage V+ (V) + V =1.95V 14 0.2 0 0 14 10 10 V+=3.3V 8 6 4 V+=8V 2 0 -50 -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) V+=8V 100 + 10 V =3.3V V+=1.95V 1 -50 Ver.2012-08-03 -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) OM- (mA) Error Amplifier Block Output Source Current vs. Temperature (VFB=1V, VIN-=0.9V) OM+ Output Source Current I 0.4 2 4 6 8 Operating Voltage V+ (V) 10 Output Block Output Low Level ON Resistance vs. Temperature (Io=+20mA) 12 12 1000 0.6 10 Output Block Output High Level ON Resistance vs. Temperature (Io=-20mA) T 0.8 Output Low Level ON Resistance ROL () 0 16 OH Output High Level ON Resistance () R 0 (mA) DD_STB 1200 (R =Open, Ta=25oC) 1 Output Sink Current I Quiescent Current IDD (A) 1400 L V+=1.95V 8 6 V+=3.3V 4 2 0 -50 0.2 V+=8V -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) Error Amplifier Block Output Sink Current vs. Temperature (VFB=1V, VIN- =1.1V) 0.15 V+=1.95V, 3.3V, 8V 0.1 0.05 0 -50 -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) -7- NJU7632 TYPICAL CHARACTERISTICS Soft Start Time vs. Temperature Reference Voltage vs. Temperature + (V =3.3V) 24 (V) Soft Start Time Tss (ms) 22 1.005 Reference Voltage V B 20 18 16 14 12 10 8 -50 1 0.995 0.99 -50 -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) Oscillator Frequency vs. Temperature + Oscillator Frequency fOSC (kHz) 760 (V =3.3V, R =47k) 2.06 T Threshold Voltage (V) 740 720 700 680 660 640 -50 -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) 1.94 200 0 -50 -8- -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) VT_OFF 1.9 1.86 -50 -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) Standby Current vs. Temperature + 1 Standby Current IDD_STB (A) Quiescent Current IDD (A) 400 T_ON 1.98 (V =3.3V, RT=47k) 600 Under Voltage Lockout Block vs. Temperature V + 800 -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) 2.02 Quiescent Current vs. Temperature 1000 (V+=3.3V) 1.01 (V =3.3V, RT=Open) 0.8 0.6 0.4 0.2 0 -50 -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) Ver.2012-08-03 NJU7632 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.2012-08-03 -9-