NJM2377 SWITCHING REGULATOR CONTROL IC ■GENERAL DESCRIPTION

■PACKAGE OUTLINE

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.

■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

NJM2377D

NJM2377M

NJM2377V

NJM2377R

■BLOCK DIAGRAM REF

CT

CS

V+

8

7

6

5

30uA

VREF

PIN FUNCTION 1. IN2. F.B 3. GND 4. OUT 5. V+ 6. CS 7. CT 8. REF

OSC L.O

U.V.LO

S.C.P ER·AMP 0.52V

PWM

1

IN-

2

F.B

3

GND

4

OUT

Ver 2.2 - 1 -

NJM2377 ■ABSOLUTE MAXIMUM RATINGS (Ta=25°C) 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

■RECOMEND OPERATING CONDITIONS (V+=3V, Ta=25°C) 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

-2-

UNIT V mA mW °C °C

UNIT V kΩ pF kΩ kHz

NJM2377 ■ELECTRICAL CHARACTERISTICS (V+=3V,RT=39kΩ,CT=470pF,Ta=25°C) REFERENCE VOLTAGE BLOCK PARAMETER SYMBOL Output Voltage Line Regulation Load Regulation OSCILLATOR BLOCK PARAMETER Oscillation Frequency Oscillate Fluctuations1 (Line Fluctuations) Oscillate Fluctuations2 (Temp Fluctuations)

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

(CS Pin) Input Threshold Voltage (CS Pin) Input Threshold Voltage (CS Pin)

TYP.

MAX.

UNIT

1.47 – –

1.50 3.8 5

1.53 11.5 30

V mV mV

MIN.

TYP.

MAX.

UNIT

V =2.7 ∼ 18V

80 –

100 1

120 –

kHz %

Ta=-40°C ∼ +85°C

–

5

–

%

MIN.

TYP.

MAX.

UNIT

0.52 5 90 1.0 2.2

0.53 100 – – 2.4

V nA dB MHz V

SYMBOL fOSC fdV fdT

TEST CONDITION RT=39kΩ, CT=470pF +

TEST CONDITION

VB IB AV GB VOM+

RNF=100kΩ, IN- Pin=0V

0.51 – – – 1.9

VOMIOM+

RNF=100kΩ, IN- Pin=0V VOM=1V, IN- Pin=0V

– 40

– 85

200 200

mV µA

MIN.

TYP.

MAX.

UNIT

SYMBOL

TEST CONDITION

VTH0

duty·cycle=0%

–

0.45

0.65

V

VTH80

duty·cycle=80%

–

1.05

–

V

F.B Pin=1.2V RT=39kΩ, CT=470pF

80

90

–

%

MIN.

TYP.

MAX.

UNIT

–

250

650

nA

αM

SOFT START CIRCUIT BLOCK PARAMETER SYMBOL Input Bias Current

MIN.

VREF IOR=1mA ∆VO-VIN V+=2.7 ∼ 18V, IOR=1mA ∆VO-IO IOR=0.1 ∼ 5.0mA

ERROR AMPLIFIER BLOCK PARAMETER SYMBOL Reference Voltage Input Bias Current Open Loop Gain Gain Bandwidth Product Maximum Output Voltage (F.B Pin)

TEST CONDITION

TEST CONDITION

IBCS VTHCS0

duty·cycle=0%, F.B Pin=1.2V

–

0.25

0.35

V

VTHCS80

duty·cycle=80%, F.B Pin=1.2V

–

0.79

–

V

-3-

NJM2377 ■ELECTRICAL CHARACTERISTICS (V+=3V,RT=39kΩ,CT=470pF,Ta=25°C) SHORT CIRCUIT PROTECTION PARAMETER SYMBOL Input Threshold Voltage (F.B Pin) Charge Current (CS Pin) Latch Mode Threshold Voltage (CS Pin)

VTHPC ICHG VTHLA

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)

-4-

CS Pin=0V, F.B Pin=2V

TEST CONDITION

VTHON VTHOFF VHYS

SYMBOL VOH VOL ISOURCE

GENERAL CHARACTERISTICS PARAMETER SYMBOL Quiescent Current Average Quiescent Current

TEST CONDITION

ICCLA ICCAV

TEST CONDITION RL=10kΩ Output Sink Current=20mA Out Pin=0V

TEST CONDITION Latch Mode, CS Pin=1.8V RL= , duty·cycle=50%

MIN.

TYP.

MAX.

UNIT

1.30

1.50

1.80

V

10 1.20

30 1.50

50 1.80

µA V

MIN.

TYP.

MAX.

UNIT

– – 60

1.95 1.78 170

– – –

V V mV

MIN.

TYP.

MAX.

UNIT

1.7 – 23

2.0 0.25 35

– 0.65 –

V V mA

MIN.

TYP.

MAX.

UNIT

– –

1.7 5.0

2.4 6.8

mA mA

NJM2377 ■ TYPICAL APPLICATIONS

+

V

Rsf

Rsr

Rt

8

Cs

Ct

7

6

D1

5

VOUT

30uA

VREF

OSC L.O

U.V.LO

CIN

N1

S.C.P

R2

N2

ER·AMP 0.52V

PWM

COUT

1

2

3

CLP

VR1

4

Q1

R1

Rf GND

GND

-5-

NJM2377 ■TIPICAL CHARACTERISTICS

1.2 L Output Voltage VOL (V)

H Output Voltage VOH (V)

H Output Voltage(OUT Pin) vs. Source Current (V+=3V,CT=0V,CS=1V,Ta=25°C) 3 2.5 2 1.5 1 0.5

L Output Voltage(OUT Pin) vs. Sink Current (V+=3V,CS=FB=0V,CT=0.5V,Ta=25°C)

1 0.8 0.6 0.4 0.2 0

0 0

1000

10

20

30

0

40

10

20

30

40

50

60

Source Current ISOURCE (mA)

Sink Current ISINK (mA)

Oscillator Frequency vs. Timing Resistor (V+=3V,Ta=25°C)

Oscillator Frequency vs. Timing Capacitor (V+=3V,Ta=25°C)

1000

RT=10kΩ

100

Oscillator Frequency f OSC (kHz)

Oscillator Frequency f OSC (kHz)

RT=39kΩ

CT=470pF CT=1000pF

10

100

10

1

1 1

10 100 1000 Timing Resistor RT (kΩ)

1.5 1.48 1.46 1.44 1.42

100 1000 10000 Timing Capacitor CT (pF)

100000

Operating Current vs. Operating Voltage (Ta=25°C)

6 Operating Current ICC (mA)

Reference Voltage VREF (V)

10

10000

Reference Voltage vs. Output Current (V+=3V,Ta=25°C)

1.52

ICCAV

5 4 3

ICCLA

2 1 0

0

5

10

Output Current IOR (mA)

-6-

RT=100kΩ

15

0

5 10 15 Operating Voltage V+ (V)

20

NJM2377 ■TIPICAL CHARACTERISTICS Maximum Duty Cycle vs. Oscillator Frequency (V+=3V,Ta=25°C)

Maximum Duty Cycle αM (%)

100 90 80 70 60 50 40 30 20 10 0 10

100

1000

10000

Duty Cycle α (%)

Oscillator Frequency f OSC (kHz) Duty Cycle vs. CS Pin Voltage (V+=3V,Ta=25°C)

100 90 80 70 60 50 40 30 20 10 0 0

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 (V +=3V,RL= ∞ ,duty·cycle=50%

2 1.5 1 0.5 0

RT=39kΩ,CT=470pF)

5 Average Quiescent Current ICCAV (mA)

Quiescent Current (Latch Mode) ICCLA (mA)

Quiescent Current(Latch Mode) vs.Temperature (V+=3V,CS=1.8V) 2.5

4 3 2 1 0

-50 -25

0

25

50

75 100 125 150

Ambient Temperature Ta (°C)

-50 -25

0

25

50

75 100 125 150

Ambient Temperature Ta (°C)

-7-

NJM2377 ■TIPICAL CHARACTERISTICS Reference Voltage Block Reference Voltage vs. Temperature (V+=3V,IOR=1mA) Oscillator Frequency f OSC (kHz)

Reference Voltage VREF (V)

1.56 1.54 1.52 1.5 1.48 1.46 1.44

-50 -25

25

50

80 0

25

50

75 100 125 150

Ambient Temperature Ta (°C)

Error Amplifire Block Reference Voltage vs. Temperaure (V+=3V)

Maximum Duty Cycle vs. Temperature (V+=3V,RT=39kΩ,CT=470pF)

0.52 0.51

100 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)

Ambient Temperature Ta (°C)

Charge Current (CS Pin) vs. Temperature (V+=3V,F.B Pin=2V)

Under Voltage Lockout Block ON/OFF Threshold Voltage vs. Temperature

3 Operating Voltage V (V)

35

+

Charge Current ICHG (uA)

90

-50 -25

0.5

30 25 20

2.5

VTHON

2 VTHOFF

1.5 1

-50 -25

0

25

50

75 100 125 150

Ambient Temperature Ta (°C)

-8-

100

Ambient Temperature Ta (°C)

0.53

40

110

75 100 125 150

Maximum Duty Cycle α (%)

Error Amplifire Block Reference Voltage VB (V)

0.54

0

120

Oscillator Frequency vs. Temperature (V+=3V,RT=39kΩ,CT=470pF)

-50 -25

0

25

50

75 100 125 150

Ambient Temperature Ta (°C)

NJM2377 ■TIPICAL CHARACTERISTICS

H Output Voltage VOH (V)

H Output Voltage (OUT Pin) vs. Temperature (V+=3V,RL=10kΩ) 3 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 VOL (mV)

L Output Voltage (OUT Pin) vs. Temperature (V+=3V,ISINK=20mA) 160 140 120 100 80 60 40 20 0 -50 -25

0

25

50

75 100 125 150

Ambient Temperature Ta (°C)

Output Source Current ISOURCE (mA)

40

Output Source Current (OUT Pin) vs. Temperature (V+=3V,OUT Pin=0V)

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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