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ISL8502

2A Synchronous Buck Regulator with Integrated MOSFETs

Intersil 

ISL8502

Electrical Specifications

PARAMETER

Refer to Block and Simplified Power System Diagrams and Typical Application Schematics. Operating

Conditions Unless Otherwise Noted: VIN = 12V, or VCC = 5V ±10%, TA = -40°C to +85°C. Typical are at

TA = +25°C. (Continued)

SYMBOL

TEST CONDITIONS

MIN

MAX

(Note 7) TYP (Note 7) UNITS

PWM Frequency

fOSC

RT = 96kΩ

RT = 40kΩ

FS pin tied to VCC

400 500 600 kHz

960 1200 1440 kHz

800

kHz

Ramp Amplitude

Ramp Amplitude

Modulator Gain

Maximum Duty Cycle

Maximum Duty Cycle

REFERENCE VOLTAGE

ΔVOSC

ΔVOSC

VVIN/ΔVOSC

DMAX

DMAX

VIN = 14V

VIN = 5V

By Design

fOSC = 500kHz

fOSC = 1.2MHz

1.0

V

0.470

V

8

-

88

%

76

%

Reference Voltage

System Accuracy

VREF

0.600

V

-1.0

+1.0

%

FB Pin Bias Current

±80 ±200 nA

SOFT-START

Soft-Start Current

ISS

Enable Soft-Start Threshold

20

30

40

µA

0.8

1.0

1.2

V

Enable Soft-Start Threshold Hysteresis

12

mV

Enable Soft-Start Voltage High

2.8

3.2

3.8

V

ERROR AMPLIFIER

DC Gain

88

dB

Gain-Bandwidth Product

GBWP

15

MHz

Maximum Output Voltage

3.9

4.4

V

Slew Rate

SR

5

V/µs

INTERNAL MOSFETS

Upper MOSFET rDS(ON)

Lower MOSFET rDS(ON)

PGOOD

rDS_Upper

rDS_Lower

VCC = 5V

VCC = 5V

180

mΩ

90

mΩ

PGOOD Threshold

VFB/VREF

Rising Edge Hysteresis 1%

Falling Edge Hysteresis 1%

107 111 115

%

86

90

93

%

PGOOD Rising Delay

PGOOD Leakage Current

PGOOD Low Voltage

PGOOD Sinking Current

PROTECTION

tPGOOD_DELAY

VPGOOD

IPGOOD

fOSC = 500kHz

VPGOOD = 5.5V

250

ms

5

µA

0.10

V

0.5

mA

Positive Current Limit

IPOC_peak

IOC from VIN to PHASE (Notes 5, 6)

(TA = 0°C to +85°C)

IOC from VIN to PHASE (Notes 5, 6)

(TA = -40°C to +0°C)

2.1

3.5

4.5

A

2.0

3.4

4.0

A

6

FN6389.2

June 29, 2010

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