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NJM2377
SWITCHING REGULATOR CONTROL IC
GENERAL DESCRIPTION The NJM2377 is a high speed low voltage operation switching regulator control IC. It features a totem pole driver circuit that can directly drive an external Bipolar transistor. The NJM2377 is suitable for potable applications, including TFT panel supply with fly-back configuration. PACKAGE OUTLINE
NJM2377D
NJM2377M
FEATURES PWM switching control Operating Voltage (2.7 to 18V) Wide Oscillator Range (10 to 500 kHz) ON/OFF Maximum Duty Cycle (Ton:Toff = 9:1) Totem Pole Output Soft-Start Function UVLO (Under Voltage Lockout) Bipolar Technology Package Outline DIP8, DMP8, SSOP8, VSP8
NJM2377V
NJM2377R
BLOCK DIAGRAM
REF
8
CT
7 30uA
CS
6
V+
5
VREF
OSC L.O
U.V.LO
S.C.P ER*AMP 0.52V PWM
PIN FUNCTION 1. IN2. F.B 3. GND 4. OUT 5. V+ 6. CS 7. CT 8. REF
1
2
3
4
IN-
F.B
GND
OUT
Ver 2.0 - 1 -
NJM2377
ABSOLUTE MAXIMUM RATINGS (Ta=25C) PARAMETER SYMBOL Input Voltage V+ Output Current IO Power Dissipation PD Operating Temperature Range Storage Temperature Range TOPR TSTG
MAXIMUM RATINGS 18 50 (DIP 8) 700 (DMP 8) 300 (SSOP 8) 250 (VSP 8) 320 -40 +85 -50 +125
UNIT V mA mW C C
RECOMEND OPERATING CONDITIONS (V+=3V, Ta=25C) PARAMETER SYMBOL MIN. MAX. + Operating Voltage V 2.7 18 Feed Back Resistor RNF 100 - Oscillator Timing Capacitor CT 220 22,000 Oscillator Timing Resistor RT 5 100 Oscillation Frequency fOSC 10 500
UNIT V k pF k kHz
-2-
NJM2377
ELECTRICAL CHARACTERISTICS (V+=3V,RT=39k,CT=470pF,Ta=25C) REFERENCE VOLTAGE BLOCK PARAMETER SYMBOL Output Voltage Line Regulation Load Regulation OSCILLATOR BLOCK PARAMETER Oscillation Frequency Oscillate Fluctuations1 (Line Fluctuations) Oscillate Fluctuations2 (Temp Fluctuations)
TEST CONDITION
MIN. 1.47 - -
TYP. 1.50 3.8 5
MAX. 1.53 11.5 30
UNIT V mV mV
VREF IOR=1mA VO-VIN V+=2.7 18V, IOR=1mA VO-IO IOR=0.1 5.0mA
SYMBOL fOSC fdV fdT
+
TEST CONDITION RT=39k, CT=470pF V =2.7 18V Ta=-40C +85C
MIN. 80 - -
TYP. 100 1 5
MAX. 120 - -
UNIT kHz % %
ERROR AMPLIFIER BLOCK PARAMETER SYMBOL Reference Voltage Input Bias Voltage Open Loop Gain Gain Bandwidth Product Maximum Output Voltage (F.B Pin) Output Source Current (F.B Pin) PWM COMPARATE BLOCK PARAMETER Input Threshold Voltage (F.B Pin) Input Threshold Voltage (F.B Pin) Maximum Duty Cycle VB IB AV GB VOM+ VOMIOM+
TEST CONDITION
MIN. 0.51 - - - 1.9 - 40
TYP. 0.52 5 90 1.0 2.2 - 85
MAX. 0.53 100 - - 2.4 200 200
UNIT V nA dB MHz V mV A
RNF=100k, IN- Pin=0V RNF=100k, IN- Pin=0V VOM=1V, IN- Pin=0V
SYMBOL VTH0 VTH80 M
TEST CONDITION duty*cycle=0% duty*cycle=80% F.B Pin=1.2V RT=39k, CT=470pF
MIN. - - 80
TYP. 0.45 1.05 90
MAX. 0.65 - -
UNIT V V %
SOFT START CIRCUIT BLOCK PARAMETER SYMBOL Input Bias Current (CS Pin) Input Threshold Voltage (CS Pin) Input Threshold Voltage (CS Pin) IBCS VTHCS0 VTHCS80
TEST CONDITION
MIN. -
TYP. 250 0.25 0.79
MAX. 650 0.35 -
UNIT nA V V
duty*cycle=0%, F.B Pin=1.2V duty*cycle=80%, F.B Pin=1.2V
- -
-3-
NJM2377
ELECTRICAL CHARACTERISTICS (V+=3V,RT=39k,CT=470pF,Ta=25C) SHORT CIRCUIT PROTECTION PARAMETER SYMBOL Input Threshold Voltage (F.B Pin) Charge Current (CS Pin) Latch Mode Threshold Voltage (CS Pin) VTHPC ICHG VTHLA CS Pin=0V, F.B Pin=2V
TEST CONDITION
MIN. 1.30 10 1.20
TYP. 1.50 30 1.50
MAX. 1.80 50 1.80
UNIT V A V
UNDER VOLTAGE LOCKOUT PARAMETER SYMBOL ON Threshold Voltage OFF Threshold Voltage Hysteresis Voltage OUTPUT BLOCK PARAMETER H-Output Voltage (OUT Pin) L-Output Voltage (OUT Pin) Output Source Current (OUT Pin) VTHON VTHOFF VHYS
TEST CONDITION
MIN. - - 60
TYP. 1.95 1.78 170
MAX. - - -
UNIT V V mV
SYMBOL VOH VOL ISOURCE
TEST CONDITION RL=10k Output Sink Current=20mA Out Pin=0V
MIN. 1.7 - 23
TYP. 2.0 0.25 35
MAX. - 0.65 -
UNIT V V mA
GENERAL CHARACTERISTICS PARAMETER SYMBOL Quiescent Current Average Quiescent Current ICCLA ICCAV
TEST CONDITION Latch Mode, CS Pin=1.8V RL= , duty*cycle=50%
MIN. - -
TYP. 1.7 5.0
MAX. 2.4 6.8
UNIT mA mA
-4-
NJM2377
TYPICAL APPLICATIONS
V
+
Rsf
Rsr
Cs
Rt
Ct
8
7 30uA
6
5
D1
VOUT
VREF
OSC L.O
U.V.LO
CIN
ER*AMP 0.52V PWM
S.C.P
N1
N2
R2
COUT
VR1
1
2
3
4
CLP Rf GND
Q1
R1
GND
-5-
NJM2377
TIPICAL CHARACTERISTICS
H Output Voltage(OUT Pin) vs. Source Current (V+=3V,CT=0V,CS=1V,Ta=25C) 3 H Output Voltage VOH (V) L Output Voltage VOL (V) 2.5 2 1.5 1 0.5 0 0 10 20 30 40 Source Current ISOURCE (mA)
Oscillator Frequency vs. Timing Resistor (V+=3V,Ta=25C)
1.2 1 0.8 0.6 0.4 0.2 0
L Output Voltage(OUT Pin) vs. Sink Current (V+=3V,CS=FB=0V,CT=0.5V,Ta=25C)
0
10
20
30
40
50
60
Sink Current ISINK (mA)
Oscillator Frequency vs. Timing Capacitor (V+=3V,Ta=25C)
RT=10k RT=33k
1000
1000
Oscillator Frequency f OSC (kHz)
100
Oscillator Frequency f OSC (kHz)
CT=470pF CT=1000pF
100
RT=100k
10
10
1 1 10 100 1000 Timing Resistor RT (k) 10000
1 10 100 1000 10000 Timing Capacitor CT (pF) 100000
1.52 Reference Voltage VREF (V) 1.5 1.48 1.46 1.44 1.42 0
Reference Voltage vs. Output Current (V+=3V,Ta=25C)
Operating Current ICC (mA)
6 5 4 3 2 1 0
Operating Current vs. Operating Voltage (Ta=25C)
ICCAV
ICCLA
5
10
15
0
Output Current IOR (mA)
5 10 15 Operating Voltage V+ (V)
20
-6-
NJM2377
TIPICAL CHARACTERISTICS
Maximum Duty Cycle vs. Oscillator Frequency (V+=3V,Ta=25C)
100 90 80 70 60 50 40 30 20 10 0 10
Maximum Duty Cycle M (%)
100
1000
10000
Oscillator Frequency f OSC (kHz) Duty Cycle vs. CS Pin Voltage (V+=3V,Ta=25C)
100 90 80 70 60 50 40 30 20 10 0 0
Duty Cycle (%)
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 CS Pin Voltage (V)
Average Quiescent Current vs. Temperature
Quiescent Current(Latch Mode) vs.Temperature (V+=3V,CS=1.8V) 2.5 Quiescent Current (Latch Mode) ICCLA (mA) 2 1.5 1 0.5 0 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (C)
Average Quiescent Current ICCAV (mA)
(V +=3V,RL= ,duty*cycle=50% 5 4 3 2 1 0 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (C) RT=39k,CT=470pF)
-7-
NJM2377
TIPICAL CHARACTERISTICS
Reference Voltage Block Reference Voltage vs. Temperature (V+=3V,IOR=1mA) Oscillator Frequency f OSC (kHz) Oscillator Frequency vs. Temperature (V+=3V,RT=39k,CT=470pF)
1.56 Reference Voltage VREF (V) 1.54 1.52 1.5 1.48 1.46 1.44
120 110 100 90 80
-50 -25
0
25
50
75 100 125 150
-50 -25
0
25
50
75 100 125 150
Ambient Temperature Ta (C) Error Amplifire Block Reference Voltage vs. Temperaure (V+=3V)
Ambient Temperature Ta (C) Maximum Duty Cycle vs. Temperature (V+=3V,RT=39k,CT=470pF)
0.54 Error Amplifire Block Reference Voltage VB (V) 0.53 0.52 0.51 0.5
100 Maximum Duty Cycle (%) 95 90 85 80
-50 -25
0
25
50
75 100 125 150
-50 -25
0
25
50
75 100 125 150
Ambient Temperature Ta (C) Charge Current (CS Pin) vs. Temperature (V+=3V,F.B Pin=2V) Operating Voltage V (V)
Ambient Temperature Ta (C) Under Voltage Lockout Block ON/OFF Threshold Voltage vs. Temperature
40 Charge Current ICHG (uA) 35 30 25 20
3 2.5 2 1.5 1
+
VTHON
VTHOFF
-50 -25
0
25
50
75 100 125 150
-50 -25
0
25
50
75 100 125 150
Ambient Temperature Ta (C)
Ambient Temperature Ta (C)
-8-
NJM2377
TIPICAL CHARACTERISTICS
H Output Voltage (OUT Pin) vs. Temperature (V+=3V,RL=10k) 3 H Output Voltage VOH (V) 2.5 2 1.5 1 0.5 0 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (C) L Output Voltage (OUT Pin) vs. Temperature (V+=3V,ISINK=20mA) 160 L Output Voltage VOL (mV) 140 120 100 80 60 40 20 0 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (C) Output Source Current (OUT Pin) vs. Temperature (V+=3V,OUT Pin=0V)
40 Output Source Current ISOURCE (mA) 35 30 25 20 15 10 5 0
-50 -25
0
25
50
75 100 125 150
[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.
Ambient Temperature Ta (C)
-9-

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