MP2125 – DUAL 1.5A, 1.2MHZ SYNCHRONOUS STEP-DOWN CONVERTER

MP2125 Rev. 1.0

www.MonolithicPower.com

3

12/24/2013

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© 2013 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

0.784

0.800

0.816

V

Regulated FB Voltage

0.776

0.800

0.824

V

FB Input Bias Current

-50

-2

+50

nA

SW PFET On Resistance

0.25

Ω

SW NFET On Resistance

0.2

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%

3.0

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

FB1

Feedback input voltage for channel 1

2

GND1

Ground pin 1

3

SW1

Switch node to the inductor for channel 1

4

N/C

Not connect

5

PVIN2

Channel 2 input supply pin for power FET

6

VIN2

Channel 2 input supply pin for controller

7

EN2

Enable input for channel 2, “High” enables channel 2. EN2 is pulled to GND with 1Meg

internal resistor

8

FB2

Feedback input voltage for channel 2

9

GND2

Ground pin 2

10

SW2

Switch node to the inductor for channel 2

11

N/C

Not connect

12

PVIN1

Channel 1 input supply pin for power FET

13

VIN1

Channel 1 input supply pin for controller

14

EN1

Enable input for channel 1, “High” enables channel 1. EN1 is pulled to GND with 1Meg

internal resistor