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ISL8088

Dual 800mA Low Quiescent Current 2.25MHz High Efficiency Synchronous Buck Regulator

Intersil 

ISL8088

Electrical Specifications

Unless otherwise noted, all parameter limits are established over the recommended operating

conditions: TA = -40°C to +85°C, VIN = 2.75V to 5.5V, EN1 = EN2 = VIN, SYNC = 0V,

L = 2.2µH, C1 = 10µF, C2 = C4 = 10µF, IOUT1 = IOUT2 = 0A to 800mA. (Typical values are

at TA = +25°C, VIN = 3.6V). Boldface limits apply over the operating temperature

range, -40°C to +85°C. (Continued)

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

MAX

(Note 6) TYP (Note 6) UNITS

N-Channel MOSFET ON-Resistance

LX_ Maximum Duty Cycle

VIN = 5.5V, IO = 200mA

VIN = 2.75V, IO = 200mA

180 350

mΩ

320 450

mΩ

100

%

PWM Switching Frequency

FS

Synchronization Range

1.8 2.25 2.7

2.7

4

MHz

MHz

LX Minimum On-Time

SYNC = 0 (forced PWM mode)

100

ns

Soft Discharge Resistance

PG

RDIS_ EN = LOW

80

100 130

Ω

Output Low Voltage

Sinking 1mA, VFB = 0.5V

0.3

V

PG Pull-up Resistor

1

MΩ

Internal PGOOD Low Rising Threshold

Percentage of nominal regulation

voltage

88

92

96

%

Internal PGOOD Low Falling Threshold

Percentage of nominal regulation

voltage

82

89

91

%

Delay Time (Rising Edge)

1

ms

Internal PGOOD Delay Time (Falling Edge)

EN1, EN2, SYNC

1

2

µs

Logic Input Low

0.4

V

Logic Input High

1.4

V

SYNC Logic Input Leakage Current

Enable Logic Input Leakage Current

Thermal Shutdown

ISYNC

IEN_

Pulled up to 5.5V

0.1

1

µA

0.1

1

µA

150

°C

Thermal Shutdown Hysteresis

25

°C

NOTE:

6. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established

by characterization and are not production tested.

5

FN6858.1

April 29, 2010

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