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7447785004

24V Input, 1A/2A Output, High Efficiency Synchronous Buck Regulator with Power Good Indication

Microchip Technology 

MCP16321/2

1.0 ELECTRICAL

CHARACTERISTICS

Absolute Maximum Ratings†

VIN.................................................................... -0.3V to 26.4V

SW ...................................................................... -1V to 26.4V

BOOST – GND ........................................... -0.3V to (VIN+6V)

EN,VFB, PG Voltage.............................................. -0.3V to 6V

Continuous Total Power Dissipation .......................................

...................................................See Thermal Characteristics

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

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

ESD Protection On All Pins:

HBM ......................................................................... 3 kV

MM ..........................................................................200V

† Notice: Stresses above those listed under “Absolute

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 sections of this

specification is not intended. Exposure to maximum

rating conditions for extended periods may affect

device reliability.

DC CHARACTERISTICS

Electrical Characteristics: Unless otherwise indicated, TA = +25°C, VIN = 12V, VOUT = 3.3V, IOUT = 300 mA,

L = 4.7 µH, COUT = 2x22 µF, CIN = 2x10 µF. Boldface specifications apply over the TJ range of -40°C to +125°C.

Parameters

Sym

Min

Typ

Max

Units Conditions

VIN Supply Voltage

Input Voltage

Quiescent Current

(Switching)

VIN

6.0

—

24

V

IQ

—

5.2

—

mA IOUT = 0 mA

Quiescent Current

(Non-Switching)

Quiescent Current -

Shutdown

IQ

—

2.3

—

mA Closed Loop in

Overvoltage

IOUT = 0 mA

IQ

—

5

10

µA EN = 0

VIN Undervoltage Lockout

Undervoltage Lockout Start

UVLOSTRT

5.5

5.75

Undervoltage Lockout

Hysteresis

UVLOHYS

—

0.65

6.0

V VIN Rising

—

V Non-Switching

Output Characteristics

Maximum Output Current

MCP16321

IOUT

1

—

—

A VIN = 6V to 24V

Maximum Output Current

MCP16322

IOUT

2

—

—

A VIN = 6V to 24V

Output Voltage Adjust Range

Output Voltage Tolerance

in PWM Mode

VOUT

VOUT-PWM

0.9

VOUT - 2%

—

VOUT

5.0

VOUT + 2%

V

V IOUT = 1A

Output Voltage Tolerance

in PFM Mode

VOUT-PFM

VOUT - 1% VOUT + 1% VOUT + 3.5% V IOUT = 0A

Feedback Voltage

Feedback Reference

Tolerance

VFB

VFB-TOL

0.886

0.9

-1.5

—

0.914

V

1.5

%

PFM Mode Feedback

Comparator Threshold

VFB-PFM

—

VOUT + 1%

—

V

Feedback Input Bias

Current

IFB

—

100

—

nA

Note 1: Regulator SW pin is forced off for 240 ns every 8 cycles to ensure the BOOST cap is replenished.

© 2011 Microchip Technology Inc.

DS22285A-page 3

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