MCP1650 datasheet(5/28 Pages) MICROCHIP

5 / 28 page

 2004 Microchip Technology Inc.

DS21876A-page 5

MCP1650/51/52/53

1.0

ELECTRICAL

CHARACTERISTICS

Absolute Maximum Ratings †

VIN TO GND...........................................................6.0V

CS,FB,LBI,LBO,SHDN,PG,EXT............ GND – 0.3V to

VIN + 0.3V

Current at EXT pin ................................................ ±1A

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

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

ESD protection on all pins

........................... ≥ 4kV HBM

† 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.

DC CHARACTERISTICS

Electrical Specifications: Unless otherwise noted, all parameters apply at VIN = +2.7V to +5.5V, SHDN =High,

TJ = -40°C to +125°C. Typical values apply for VIN = 3.3V, TA +25°C.

Parameters

Sym

Min

Typ

Max

Units

Conditions

Input Characteristics

Supply Voltage

VIN

2.7

—

5.5

Undervoltage Lockout

(S Option)

UVLO

2.4

2.55

2.7

VIN rising edge

Under Voltage Lockout

(R Option)

UVLO

1.85

2.0

2.15

VIN rising edge

Undervoltage Hysteresis

UVLOHYST

—117

—

Shutdown Supply Current

ISHD

—

0.001

µA

SHDN = GND

Quiescent Supply Current

—

120

220

µA

EXT = Open

Soft Start Time

TSS

—

500

—

µs

Feedback Characteristics

Feedback Voltage

VFB

1.18

1.22

1.26

All conditions

Feedback Comparator

Hysteresis

VHYS

—12

Feedback Input Bias Current

IFBlk

-50

—

VFB < 1.3V

Current Sense Input

Current Sense Threshold

ISNS-TH

114

155

Delay from Current Sense to

Output

Tdly_ISNS

—80

—

Ext Drive

EXT Driver ON Resistance

(High Side)

RHIGH

—8

Ω

EXT Driver ON Resistance

(Low Side)

RLOW

—4

Ω

Oscillator Characteristics

Switching Frequency

FOSC

650

750

850

kHz

Low Duty Cycle Switch-Over

Voltage

VLowDuty

—3.8

—

VIN rising edge

Duty Cycle Switch Voltage

Hysteresis

DCHyst

—92

—

Low Duty Cycle

DCLOW

High Duty Cycle

DCHIGH

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