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MCP1601

500 mA Synchronous BUCK Regulator

Microchip Technology 

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 4 kV

† 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

SHDN

Input Source Voltage

Device Shutdown Pin

FB

Output Voltage Feedback Input

AGND

Analog Ground

VOUT

Sensed Output Voltage

SYNC/PWM

Synchronous Clock input or PWM/

PFM select

PGND

LX

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

Shutdown Current

PFM Mode Current

Oscillator Section

Internal Oscillator Frequency

External Oscillator Capture Range

External Oscillator Duty Cycle

Internal Power Switches

RDSon P-CHANNEL

RDSon N-CHANNEL

Dropout Voltage

Pin Leakage Current

Output PWM Mode

Peak Current Limit

Output Voltage

Output Voltage Range

Reference Feedback Voltage

Feedback Input Bias Current

Line Regulation

Load Regulation

Start-Up Time

VIN

I(VIN)

I(VIN)

2.7

—

5.5

—

0.05

1.0

V ILOAD = 0 mA to 500 mA

µA Shutdown Mode (SHDN = GND)

—

119

180

µA SYNC/PWM = GND, PFM Mode

(ILOAD = 0 mA)

FOSC

650

FSYNC

850

FSYN-FALL

10

750

850

kHz SYNC/PWM = VIN

—

1000

kHz FSYNC > FOSC

—

90

% FSYNC = 1 MHz

RDSon-P

—

500

—

m IP=100 mA, TA=+25°C, VIN=4.2V

RDSon-N

—

500

—

m IN=100 mA, TA=+25°C, VIN =4.2V

VDROPOUT

—

250

—

mV VOUT = 2.7V, ILOAD = 300 mA,

TA=+25°C, VDROPOUT=97%VOUT

ILX

-1.0

—

1.0

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

5.5V

IPEAK-PWM

—

1.0

—

A PWM Mode, SYNC/PWM = VIN, TA =

+25°C

VOUT

0.9

—

VIN

V

VFB

0.78

0.8

0.82

V

IVFB

—

0.1

—

nA

VLINE-REG

—

0.1

—

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

VLOAD-REG

—

1.5

—

% VIN = 3.6V,

ILOAD = 0 mA to 300 mA

TSTART

—

0.5

—

ms PWM Mode, SYNC/PWM=VIN

 2003-2013 Microchip Technology Inc.

DS21762B-page 3

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