RT9629B_15 Datasheet, PDF (2/14 Pages) Richtek Technology Corporation – Triple-Channel Synchronous Rectified Buck MOSFET Driver

RT9629B
Ordering Information
RT9629B
Package Type
QW : WQFN-24L 5x5 (W-Type)
Lead Plating System
Z : ECO (Ecological Element with
Halogen Free and Pb free)
Note :
Richtek products are :
 RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
 Suitable for use in SnPb or Pb-free soldering processes.
Pin Configurations
(TOP VIEW)
24 23 22 21 20 19
UGATE3 1
BOOT3 2
GND 3
NC 4
PWM3 5
NC 6
GND
18 PHASE2
17 LGATE2
16 VCC1
15 LGATE1
14 GND
25
13 PHASE1
7 8 9 10 11 12
WQFN-24L 5x5
Function Pin Description
Pin No.
Pin Name
1, 12, 19
UGATE3,
UGATE1,
UGATE2
2, 11, 20
BOOT3,
BOOT1,
BOOT2
3, 14, 23,
25 (Exposed Pad)
GND
Pin Function
High Side Gate Drive Outputs for Phase 3, Phase 1, and Phase 2. Connect this
pin to the Gate of high side power MOSFET.
Bootstrap Power Pins for Phase 3, Phase 1, and Phase 2. This pin powers the
high side MOSFET driver. Connect this pin to the junction of the bootstrap
capacitor and the cathode of the bootstrap diode.
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
4, 6, 8
NC
No Internal Connection.
5, 7, 9
PWM3,
PWM2,
PWM1
PWM Signal Input. Connect this pin to the PWM output of the controller.
10
13, 18, 24
15, 17, 22
16, 21
POR
Power On Reset Signal.
PHASE1,
PHASE2,
PHASE3
Switch Nodes of High Side Driver 1, Driver 2, and Driver 3. Connect this pin to
the high side MOSFET Source together with the low side MOSFET Drain and
the inductor.
LGATE1,
LGATE2,
LGATE3
Low Side Gate Drive Output for Phase 1, Phase 2, and Phase 3. This pin drives
the Gate of low side MOSFET.
VCC1, VCC2
Supply Input Pin. VCC1 supplies current for Channel 1
drivers. VCC2 supplies current for Channel 3 gate driver.
and Channel
2
gate
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS9629B-06 July 2015