MCP1601 datasheet(3/22 Pages) MICROCHIP

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 2003 Microchip Technology Inc.

DS21762A-page 3

MCP1601

1.0

ELECTRICAL

CHARACTERISTICS

Absolute Maximum Ratings †

VIN - AGND ......................................................................6.0V

SHDN, FB, SYNC/PWM, VOUT ..... (AGND-0.3V) to (VIN+0.3V)

LX to PGND................................................ -0.3V to (VIN+0.3V)

PGND to AGND .................................................. -0.3V to +0.3V

Output Short Circuit Current .................................continuous

Storage temperature .....................................-65°C to +150°C

Ambient Temp. with Power Applied ................-40°C to +85°C

Operating Junction Temperature...................-40°C to +125°C

ESD protection on all pins

..................................................≥ 4kV

† Notice: Stresses above those listed under “Maximum rat-

ings” may cause permanent damage to the device. This is a

stress rating only and functional operation of the device at

those or any other conditions above those indicated in the

operational listings of this specification is not implied. Expo-

sure to maximum rating conditions for extended periods may

affect device reliability.

PIN FUNCTION TABLE

NAME

FUNCTION

VIN

Input Source Voltage

SHDN

Device Shutdown Pin

Output Voltage Feedback Input

AGND

Analog Ground

VOUT

Sensed Output Voltage

SYNC/PWM

Synchronous Clock input or PWM/

PFM select

PGND

Power Ground

Output Inductor Node

ELECTRICAL SPECIFICATIONS

Electrical Specifications: Unless otherwise indicated, VIN=4.2V, VOUT=1.8V, ILOAD = 10 mA, TA=-40°C to +85°C.

Parameters

Sym

Min

Typ

Max

Units

Conditions

Power Input Requirements

Voltage

VIN

2.7

—

5.5

ILOAD = 0 mA to 500 mA

Shutdown Current

I(VIN)

—

0.05

1.0

µA

Shutdown Mode (SHDN = GND)

PFM Mode Current

I(VIN)

—

119

180

µA

SYNC/PWM = GND, PFM Mode

(ILOAD = 0 mA)

Oscillator Section

Internal Oscillator Frequency

FOSC

650

750

850

kHz

SYNC/PWM = VIN

External Oscillator Capture Range

FSYNC

850

—

1000

kHz

FSYNC > FOSC

External Oscillator Duty Cycle

FSYN-FALL

—

FSYNC = 1 MHz

Internal Power Switches

RDSon P-CHANNEL

RDSon-P

—

500

—

Ω

IP=100 mA, TA=+25°C, VIN=4.2V

RDSon N-CHANNEL

RDSon-N

—

500

—

Ω

IN=100 mA, TA=+25°C, VIN =4.2V

Dropout Voltage

VDROPOUT

—

250

—

VOUT = 2.7V, ILOAD = 300 mA,

TA=+25°C, VDROPOUT=97%VOUT

Pin Leakage Current

ILX

-1.0

—

1.0

µA

SHDN = 0V, VIN = 5.5V, LX = 0V, LX =

5.5V

Output PWM Mode

Peak Current Limit

IPEAK-PWM

—

1.0

—

PWM Mode, SYNC/PWM = VIN, TA =

+25°C

Output Voltage

Output Voltage Range

VOUT

0.9

—

VIN

Reference Feedback Voltage

VFB

0.78

0.8

0.82

Feedback Input Bias Current

IVFB

—

0.1

—

Line Regulation

VLINE-REG

—

0.1

—

%/V

VIN=2.7V to 5.5V, ILOAD=10 mA

Load Regulation

VLOAD-REG

—

1.5

—

%VIN = 3.6V,

ILOAD = 0 mA to 300 mA

Start-Up Time

TSTART

—

0.5

—

PWM Mode, SYNC/PWM=VIN

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