MP8048 - 22V, 4A QUAD CHANNEL POWER HALF-BRIDGE

M8048 Rev. 1.1

www.MonolithicPower.com

4

9/10/2009

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2009 MPS. All Rights Reserved.

PIN FUNCTIONS

Pin #

Name

Description

1

NC

No connect.

2,3

SW1B

Switched Output 1B. Connect the output LC filter to SW1B. SW1B is valid

approximately 100µs after VSP goes high.

4,5

VSP1B

Power Supply Input. Connect VSP1B to the positive side of the input power supply.

Bypass VSP1B to PGND as close to the IC as possible.

6

VSP1A

Power Supply Input. Connect VSP1A to the positive side of the input power supply.

Bypass VSP1A to PGND as close to the IC as possible.

7,8

SW1A

Switched Output 1A. Connect the output LC filter to SW1A. SW1A is valid

approximately 100µs after VSP goes high.

9,10

PGND1A

Power Ground of channel 1A. Connect the exposed pad on bottom side to the ground

plane.

11

BST1A

Bootstrap Supply. BST1A powers the high-side gate of the SW1A stage. Connect a

0.1μF or greater capacitor between BST1A and SW1A.

12

PWM1A

Driver Logic Input 1A. Drive PWM1 with the signal that controls the MP8048 SW1A.

Drive PWM high to turn on the high side switch; drive PWM low to turn on the low-side

switch.

13

PWM1B

Driver Logic Input 1B. Drive PWM1 with the signal that controls the MP8048 SW1B.

Drive PWM high to turn on the high side switch; drive PWM low to turn on the low-side

switch.

14

FAULTB

Fault Output. A low output at FAULT indicates that the MP8048 has detected an over

temperature or over current condition. This output is open drain.

15

SHDNB

Shutdown Input. When low, the IC will be shut off.

16,35

AGND

Analog Ground.

17

PWM2A

Driver Logic Input 2A. Drive PWM2 with the signal that controls the MP8048 SW2A.

Drive PWM high to turn on the high side switch; drive PWM low to turn on the low-side

switch.

18

STBYB

Standby Input. Default low (internal pull-down). If driven high, the output of the drivers

is determined by the PWM1A/1B/2A/2B. If driven low, the output of both drivers is high

impedance.

19

PWM2B

Driver Logic Input 2B. Drive PWM2 with the signal that controls the MP8048 SW2B.

Drive PWM high to turn on the high side switch; drive PWM low to turn on the low-side

switch.

20

BST2B

Bootstrap Supply. BST2B powers the high-side gate of the SW2B stage. Connect a

0.1μF or greater capacitor between BST2B and SW2B.

21,22

PGND2B

Power Ground of Channel 2B. Connect the exposed pad on the bottom side to the

ground plane.

23,24

SW2B

Switched Output 2B. Connect the output LC filter to SW2B. SW2B is valid

approximately 100µs after VSP goes high.

25

VSP2B

Power Supply Input. Connect VSP2B to the positive side of the input power supply.

Bypass VSP2B to PGND as close to the IC as possible.

26,27

VSP2A

Power Supply Input. Connect VSP2A to the positive side of the input power supply.

Bypass VSP2A to PGND as close to the IC as possible.

28,29

SW2A

Switched Output 2A. Connect the output LC filter to SW2A. SW2A is valid

approximately 100µs after VSP goes high.

30,31

PGND2A

Power Ground of channel 2A. Connect the exposed pad on bottom side to the ground

plane.

32

BST2A

Bootstrap Supply. BST2A powers the high-side gate of the SW2A stage. Connect a

0.1μF or greater capacitor between BST2A and SW2A.