MP2012 – 1.5A SYNCHRONOUS STEP-DOWN CONVERTER

MP2012 Rev. 1.01

www.MonolithicPower.com

3

9/22/2011

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2011 MPS. All Rights Reserved.

Parameters

Condition

Min

Typ

Max

Units

Supply Current

600

750

μA

Shutdown Current

0.01

1

μA

Thermal Shutdown Trip Threshold

Hysteresis = 20°C

150

°C

EN Trip Threshold

0.3

1.0

1.5

V

EN Input Current

0.1

1.0

μA

EN Input Current

6

μA

IN Undervoltage Lockout Threshold

Rising Edge

2.15

2.40

2.65

V

IN Undervoltage Lockout Hysteresis

160

mV

Regulated FB Voltage

0.784

0.776

0.800

0.800

0.816

0.824

V

FB Input Bias Current

-50

-2

+50

nA

SW PFET On Resistance

0.18

0.25

0.28

Ω

SW NFET On Resistance

0.14

0.2

0.24

Ω

SW Leakage Current

-1

0.1

1

μA

SW Leakage Current

-5

1.5

5

μA

SW PFET Peak Current Limit

Duty Cycle=100%

Duty Cycle=50%

(6)

2.1

3.0

3.5

A

Switching Frequency

1.0

1.2

1.4

MHz

Notes:

5) Production test at +25°C. Specifications over the temperature range are guaranteed by design and characterization.

PIN FUNCTIONS

Pin #

Name

Description

1

FB

Feedback input. An external resistor divider from the output to GND, tapped to the FB

pin sets the output voltage.

2

GND,

Exposed Pad

Ground pin. Connect exposed pad to ground plane for proper thermal

performance.

3

SW

Switch node to the inductor.

4

PVIN

Input supply pin for power FET.

5

VIN

Input Supply pin for controller. Put small decoupling ceramic near this pin.

6

EN

Enable input, “High” enables MP2012. EN is pulled to GND with 1Meg internal resistor.