MCP1612T-ADJI/MF(2005) 查看數據表（PDF） - Microchip Technology

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MCP1612T-ADJI/MF
(Rev.:2005)

Single 1A, 1.4 MHz Synchronous Buck Regulator

Microchip Technology 

MCP1612

1.0 ELECTRICAL

CHARACTERISTICS

Absolute Maximum Ratings †

VIN – AGND .......................................................................6.0V

(SHDN, FB, VCC, Comp ........... (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 (HBM) ....................................... 4 kV

ESD protection on all pins (MM)......................................... 300V

† Notice: Stresses above those listed under “Maximum

Ratings” 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.

Exposure to maximum rating conditions for extended periods

may affect device reliability.

DC CHARACTERISTICS

Electrical Specifications: Unless otherwise noted, VIN = VCC = VSHDN = 3.3V, VOUT = 1.8V, CIN = COUT = 10 µF, L = 3.3 µH,

ILOAD = 100 mA, TA = +25°C. Boldface specifications apply over the TA range of -40°C to +85°C.

Parameters

Sym

Min

Typ

Max

Units

Conditions

Input Voltage

Input Operating Voltage

Input Shutdown Current

Input Quiescent Current

Oscillator Characteristics

VIN

I(VIN)

I(VIN)

2.7

—

5.5

—

0.01

1

—

5

7

V

µA Shutdown mode (SHDN = GND)

mA ILOAD = 0 mA

Internal Oscillator Frequency

Internal Power Swicthes

FOSC

1.2

1.4

1.6

MHz

RDSon P-Channel

RDSon N-Channel

LX Pin Leakage Current

RDSon-P

—

RDSon-N

—

ILX

-1

Positive Current Limit Threshold +ILX(MAX)

—

Negative Current Limit Threshold -ILX(MAX)

—

Feedback Characteristics

300

—

300

—

—

1

2.3

—

-1.4

—

mΩ IP = 250 mA

mΩ IN = 250 mA

µA SHDN = 0V, VIN = 5.5V, LX = 0V,

LX = 5.5V

A

A

Transconductance from FB to

gm

35

62

90

µA/V

COMP

Output Voltage

Output Voltage Range

VOUT

0.8

—

VIN

V

Reference Feedback Voltage

VFB

0.78

0.8

0.82

V

Feedback Input Bias Current

IVFB

—

1

—

nA

Line Regulation

VLINE-REG

—

0.15

0.5

%/V VIN = 2.7V to 5.5V, ILOAD = 100 mA

Load Regulation

VLOAD-REG

—

0.25

—

% VIN = 4.2V, ILOAD = 100 mA to 1A

Note 1:

2:

The integrated MOSFET switches have an integral diode from the LX pin to VIN and from LX to PGND. In cases where

these diodes are forward-biased, the package power dissipation limits must be adhered to. Thermal protection is not

able to regulate the junction temperature for these cases.

UVLO is specified for a falling VIN. Once the UVLO is activated, the UVLO-HYS must be overcome before the device will

return to operation.

DS21921B-page 4

© 2005 Microchip Technology Inc.

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