MP4350 – 2.5A, 4MHz, 20V STEP-DOWN CONVERTER

MP4350 Rev. 1.0

www.MonolithicPower.com

2

5/26/2008

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2008 MPS. All Rights Reserved.

PACKAGE REFERENCE

Part Number*

Package

Temperature

MP4350DQ

QFN10 (3x3)

–40

°C to +85°C

For RoHS compliant packaging, add suffix –LF

(eg. MP4350DQ–LF–Z)

BST to SW..................................... –0.3V to +6V

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

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

°C

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

°C

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

°C

Recommended Operating Conditions

(2)

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

°C to +85°C

Thermal Resistance

(3)

QFN10 (3mm x 3mm)............. 50 ...... 12...

°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 approximately 1” square of 1 oz copper.

ELECTRICAL CHARACTERISTICS

Parameter

Symbol Condition

Min

Typ

Max

Units

Feedback Voltage

0.776

0.8

0.824

V

Upper Switch On Resistance

150

mΩ

Upper Switch Leakage

1

µA

Current Limit

Duty Cycle = 50%

2.9

3.5

A

Error Amp Voltage Gain

(4)

200

V/V

Error Amp Transconductance

40

60

80

µA/V

Error Amp Min Source current

5

µA

Error Amp Min Sink current

–5

µA

VIN UVLO Threshold

2.7

3.0

3.3

V

VIN UVLO Hysteresis

0.35

V

Soft-Start Time

(4)

1.5

ms

1.6

2

2.4

MHz

Oscillator Frequency

3.2

4

4.8

MHz

Shutdown Supply Current

12

18

µA

Quiescent Supply Current

100

125

µA

Thermal Shutdown

150

°C

Thermal Shutdown Hysteresis

15

°C

Minimum Off Time

(4)

100

ns

Minimum On Time

(4)

100

ns

EN Up Threshold

1.35

1.5

1.65

V

EN Down Threshold

1.15

1.2

1.25

V

Note:

4) Guaranteed by design.

TOP VIEW

SW

SW

EN

COMP

FB

1

2

3

4

5

BST

VIN

VIN

FREQ

GND

10

9

8

7

6

EXPOSED PAD

ON BACKSIDE