NCP1597_13 datasheet(4/13 Pages) ONSEMI

Part #	NCP1597

Description	Synchronous Buck Regulator

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Manufacturer	ONSEMI [ON Semiconductor]

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NCP1597A

http://onsemi.com

4

ELECTRICAL CHARACTERISTICS

(Vin = 4.0 V − 5.5 V, Vout = 1.2 V, TJ = +25°C for typical value; −40°C < TJ < 85°C for min/max values unless noted otherwise)

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

Vin Input Voltage Range

Vin

4.0

5.5

V

VCC UVLO Threshold

3.2

3.5

3.8

V

UVLO Hysteresis

335

mV

VCC Quiescent Current

IinVCC

Vin = 5 V,VFB = 1.5 V, (No Switching)

1.7

2.0

mA

VCCP Quiescent Current

IinVCCP

Vin = 5 V,VFB = 1.5 V, (No Switching)

25

mA

Vin Shutdown Supply Current (Note 2)

IQSHDN

EN = 0 V

1.8

3.0

mA

FEEDBACK VOLTAGE

Reference Voltage

VFB

0.788

0.800

0.812

V

Feedback Input Bias Current

IFB

VFB = 0.8 V

10

100

nA

Feedback Voltage Line Regulation

Vin = 4.0 V to 5.5 V

0.06

%/V

PWM

Maximum Duty Cycle (Regulating)

82

85

%

Minimum Controllable ON Time (Note 2)

50

ns

PULSE−BY−PULSE CURRENT LIMIT

Pulse−by−Pulse Current Limit (Regulation)

ILIM

2.7

3.9

4.3

A

Pulse−by−Pulse Current Limit (Soft−Start)

ILIMSS

4.0

5.3

6.1

A

OSCILLATOR

Oscillator Frequency

FSW

0.87

1.0

1.13

MHz

MOSFET

High Side MOSFET ON Resistance

RDS(on)

HS

RDS(on)

HS

IDS = 100 mA, VGS = 5 V

140

200

mW

High Side MOSFET Leakage (Note 2)

VEN = 0 V, VSW = 0 V

10

mA

Low Side MOSFET ON Resistance

RDS(on)

LS

RDS(on)

LS

IDS = 100 mA, VGS = 5 V

90

125

mW

Low Side MOSFET Leakage (Note 2)

VEN = 0 V, VSW = 5 V

10

mA

ENABLE (NCP1597A)

EN HI Threshold

ENHI

1.4

V

EN LO Threshold

ENLO

0.4

V

EN Hysteresis

200

mV

EN Pullup Current

1.4

3.0

mA

SOFT−START

Soft−Start Ramp Time

tSS

FSW = 1 MHz

1.0

ms

Hiccup Timer

2.0

ms

THERMAL SHUTDOWN

Thermal Shutdown Threshold

185

°C

Thermal Shutdown Hysteresis

30

°C

2. Guaranteed by design. Not production tested.

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