MP2101 datasheet(3/12 Pages) MPS

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MP2101 – 1.6MHz SYNCHRONOUS STEP-DOWN PLUS 200mA LDO

MP2101 Rev. 1.0

www.MonolithicPower.com

8/18/2006

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

ELECTRICAL CHARACTERISTICS (4) (continued)

VIN1/2 = VEN1/2 = 3.6V, TA = +25°C, unless otherwise noted.

Parameters

Condition

Min

Typ

Max

Units

SW1 PFET On Resistance

ISW1 = 100mA

0.35

Ω

SW1 NFET On Resistance

ISW1 = –100mA

0.25

Ω

SW1 Leakage Current

VEN1 = 0V, VIN = 6V

VSW1 = 0V or 6V

–2

µA

SW1 PFET Peak Current Limit

Duty Cycle = 100%,

Current Pulse Width < 1ms

0.9

1.4

2.0

Oscillator Frequency

1.2

1.6

2.0

MHz

Linear Regulator LDO

IN2 Input Range

ILOAD = 10mA, VOUT2=VFB2

1.2

VIN1

TA = +25°C

0.588

0.600 0.612

Regulated FB2 Voltage

–40°C ≤ TA ≤ +85°C

0.582

0.618

FB2 Input Bias Current

VFB2 = 0.6V

–50

–2

+50

OUT2 Short Circuit Foldback

VOUT2 = 0V

180

OUT2 Output Current

VOUT = 1.2V

200

Dropout Voltage

(5)

ILOAD = 150mA, VOUT2 = 1.2V

280

Notes:

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

5) The dropout voltage is equal to VIN2 – VOUT2 when VOUT2 is 100mV below the nominal value.

PIN FUNCTIONS

Pin #

Name

Description

FB1

Feedback 1. Feedback Input for the switcher output (OUT1).

EN1

Enable 1. Enable input for the switcher. Pull high to turn on the switcher; low to turn it off.

IN1

Input 1. Main input supply for both the switcher and the auxiliary low dropout (LDO) linear

regulator.

SW1

Switcher Switch Node. Output for the 800mA switcher channel.

GND

Ground.

IN2

Input 2. Input supply for the auxiliary linear regulator LDO output power device.

OUT2

Output 2. Output of the 200mA LDO. The LDO is designed to be stable with an external

minimum 1µF ceramic capacitor at 200mA of load current.

PWROK

Power On Reset Open Drain Output. A high output indicates that both outputs are within

±10% of the regulation value. A low output indicates that the output is outside of the ±10%

window. PWROK is pulled down if EN1 and/or EN2 is low. The PWROK window comparators

have a 50µs deglitch timer for the switcher and 150µs deglitch timer for the linear regulator

LDO to avoid a false trigger during load transient.

EN2

Enable 2. Enable input for the linear regulator LDO. Pull high to turn on the LDO; low to turn it

off.

FB2

Feedback 2. Feedback input for the linear regulator output (OUT2).

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