ISL85402(2011) 查看數據表（PDF） - Intersil

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ISL85402
(Rev.:2011)

2.5A Regulator with Integrated High-Side MOSFET for Synchronous Buck or Boost Buck Converter

Intersil 

ISL85402

Electrical Specifications Refer to “Block Diagram” on page 4 and “Typical Application Schematics” on page 5. Operating

Conditions Unless Otherwise Noted: VIN = 12V, or VCC = 4.5V ±10%, TA = -40°C to +85°C. Typical are at TA = +25°C. 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

POWER-ON RESET

Rising VCC POR Threshold

Falling VCC POR Threshold

VCC POR Hysteresis

ENABLE

VPORH_RISE

VPORL_FALL

VPORL_HYS

2.82 2.9 3.05 V

2.6 2.8

V

0.3

V

Required Enable On Voltage

Required Enable Off voltage

OSCILLATOR

VENH

VENL

2

V

0.8

V

PWM Frequency

FOSC

RFS = 665kΩ

RFS = 51.1kΩ

FS Pin Connected to VCC or Floating or GND

160 200 240 kHz

1950 2200 2450 kHz

450 500 550 kHz

MIN ON Time

MIN OFF Time

REFERENCE VOLTAGE

tMIN_ON

tMIN_OFF

130 225 ns

210 325 ns

Reference Voltage

System Accuracy

VREF

0.8

V

-1.0

+1.0 %

FB Pin Source Current

5

nA

SOFT-START

Soft-Start Current

ISS

ERROR AMPLIFIER

3

5

7

µA

Unity Gain-Bandwidth

DC Gain

Maximum Output Voltage

CLOAD = 50pF

CLOAD = 50pF

10

MHz

88

dB

3.6

V

Minimum Output Voltage

0.5

V

Slew Rate

PFM MODE CONTROL

SR

CLOAD = 50pF

5

V/µs

Default PFM Current Threshold

MODE = VCC or Floating

700

mA

INTERNAL HIGH-SIDE MOSFET

Upper MOSFET rDS(ON)

LOW-SIDE MOSFET GATE DRIVER

rDS(ON)_UP

125 180 mΩ

LGate Source Resistance

100mA Source Current

3.5

Ω

LGATE Sink Resistance

100mA Sink Current

3.3

Ω

BOOST CONVERTER CONTROL

EXT_BOOST Boost_Off Threshold Voltage

0.74 0.8 0.86 V

EXT_BOOST Hysteresis Sink Current

AUXVCC Boost Turn-Off Threshold Voltage

IEXT_BOOST_HYS

2.4 3.2 3.8 µA

0.74 0.8 0.86 V

AUXVCC Hysteresis Sink Current

IAUXVCC_HYS

2.4 3.2 3.8 µA

7

FN7640.0

September 29, 2011

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