MP38892DN datasheet(2/10 Pages) MPS

2 / 10 page

MP38892 – 6A, 42V, 420KHZ STEP-DOWN WITH SYNCHRONIZABLE GATE DRIVER

MP38892 Rev.1.0

www.MonolithicPower.com

9/21/2010

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

PACKAGE REFERENCE

Part Number*

Package

Temperature

MP38892DN

SOIC8E

–40

°C to +85°C

* For Tape & Reel, add suffix –Z (eg. MP38892DN–Z)

For RoHS Compliant Packaging, add suffix –LF

(eg. MP38892DN–LF–Z)

ABSOLUTE MAXIMUM RATINGS (1)

Supply Voltage VIN....................................... 45V

VSW.........................-0.3V(-5V for < 10ns) to 46V

VBST – VSW ...................................................... 6V

All Pins........................................... –0.3V to +6V

Junction Temperature...............................150

°C

Lead Temperature ....................................260

°C

Storage Temperature ..............–65

°C to +150°C

Recommended Operating Conditions

(2)

Supply Voltage VIN........................... 4.5V to 42V

Operating Temperature .............–40

°C to +85°C

Thermal Resistance

(3)

θJA

θJC

SOIC8E .................................. 50 ...... 10...

°C/W

Notes:

1) Exceeding these ratings may damage the device.

2) The device is not guaranteed to function outside of its

operating conditions.

3) Measured on JESD51-7, 4-layer PCB.

ELECTRICAL CHARACTERISTICS

VIN = 12V, TA = +25°C, unless otherwise noted.

Parameters

Symbol Condition

Min

Typ

Max

Units

Feedback Voltage

VFB

4.5V

≤ VIN ≤ 42V

0.796

0.808

0.820

Feedback Current

IFB

VFB = 0.8V

Switch On Resistance

(4)

RDS(ON)

100

mΩ

Switch Leakage

VEN = 0V, VSW = 0V

0.1

μA

Current Limit

(4)

7.5

8.0

Oscillator Frequency

fSW

VFB = 0.6V

240

420

600

KHz

Fold-back Frequency

VFB = 0V

115

205

KHz

Maximum Duty Cycle

VFB = 0.6V

Minimum On Time

(4)

tON

100

Under Voltage Lockout Threshold Rising

3.90

4.10

4.30

Under Voltage Lockout Threshold Hysteresis

880

EN Input Low Voltage

0.4

EN Input High Voltage

VEN = 2V

EN Input Current

VEN = 0V

0.1

μA

Sync Frequency Range (Low)

FSYNCL

300

KHz

Sync Frequency Range (High)

FSYNCH

1.5

MHz

Enable Turnoff Delay

TOFF

5.0

μs

Supply Current (Shutdown)

VEN = 0V

μA

Supply Current (Quiescent)

VEN = 2V, VFB = 1V

0.9

1.1

Thermal Shutdown

150

°C

BG Driver Bias Supply Voltage

VCC

ICC = 5mA

4.5

5.0

Gate Driver Sink Impedance

(4)

RSINK

Ω

Gate Driver Source Impedance

(4)

RSOURCE

Ω

Gate Drive Current Sense Trip Threshold

VSW

Note:

Guaranteed by design.

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