MOSFET Driver. RT9628A Datasheet


RT9628A Driver. Datasheet pdf. Equivalent


Part Number

RT9628A

Description

High Voltage Synchronous Rectified Triple Channel Buck MOSFET Driver

Manufacture

Richtek

Total Page 12 Pages
Datasheet
Download RT9628A Datasheet


RT9628A
®
RT9628A
High Voltage Synchronous Rectified Triple Channel Buck
MOSFET Driver for Notebook Computer
General Description
The RT9628A is a high frequency, triple Channel driver
specifically designed to drive two power N-MOSFETs in
each channel of a synchronous-rectified Buck converter
topology. It is especially suited for mobile computing
applications that require high efficiency and excellent
thermal performance. This driver, combined with Richtek's
series of multi-phase Buck PWM controllers, provides a
complete core voltage regulator solution for advanced
microprocessors.
The drivers are capable of driving a 3nF load with fast
rising/falling time and fast propagation delay. This device
implements bootstrapping on the upper gates with only a
single external capacitor. This reduces implementation
complexity and allows the use of higher performance, cost
effective, N-MOSFETs. Adaptive shoot through protection
is integrated to prevent both MOSFETs from conducting
simultaneously.
Features
Triple Channel Driver
Each Channel Drives Two N-MOSFETs
Adaptive Shoot-Through Protection
0.5Ω On-Resistance, 4A Sink Current Capability
Supports High Switching Frequency
Tri-State PWM Input for Power Stage Shutdown
Output Disable Function
Integrated Boost Switch
Low Bias Supply Current
VCC POR Feature Integrated
Applications
Core Voltage Supplies for Intel® / AMD® Mobile
Microprocessors
High Frequency Low Profile DC/DC Converters
High Current Low Output Voltage DC/DC Converters
High Input Voltage DC/DC Converters
Marking Information
00= : Product Code
00=YM
DNN
YMDNN : Date Code
Simplified Application Circuit
12V
PWM1
PWM2
PWM3
Enable
VCCx
RT9628A
PHASE1
PWM1
PWM2
PHASE2
PWM3
EN
PHASE3
GND
VIN
L1
VOUT
L2
L3
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS9628A-00 October 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT9628A
RT9628A
Ordering Information
RT9628A
Package Type
QW : WQFN-24L 4x4 (W-Type)
(Exposed Pad-Option 1)
Lead Plating System
G : Green (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)
PHASE2
NC
UGATE2
BOOT2
NC
NC
24 23 22 21 20 19
1 18
2 17
3 16
GND
4 15
5 25 14
6 13
7 8 9 10 11 12
LGATE3
PHASE3
UGATE3
BOOT3
NC
NC
WQFN-24L 4x4
Functional Pin Description
Pin No.
Pin Name
Pin Function
1, 17, 21
PHASE2,
PHASE3,
PHASE1
Switch Nodes. Connect these pins to the Sources of the high side MOSFETs and
the Drains of the low side MOSFETs. These pins provide return paths for the high
side gate drivers.
3, 16, 20
UGATE2,
UGATE3,
UGATE1
High Side Gate Drive Outputs. Connect to the gates of high side power N-
MOSFETs.
4, 15, 19
BOOT2,
BOOT3,
BOOT1
Bootstrap Supply for High Side Gate Drives. Connect the bootstrap capacitors
between these pins and the PHASEx pins. The bootstrap capacitors provide the
charge to turn on the high side MOSFETs.
8, 9, 11
PWM2,
PWM1,
PWM3
Control Inputs for Drivers. The PWM signal can enter three distinct states during
operation. Connect these pins to the PWM outputs of the controller. The PWM
signal must be driving after EN signal then 60s.
10 EN
Enable Control Input. When pulling low, both UGATEx and LGATEx are driven
low and the normal operation is disabled.
18, 22, 24
LGATE3,
LGATE1,
LGATE2
Low Side Gate Drive Outputs. Connect to the Gates of the low side power N-
MOSFETs.
23
VCC
Supply Voltage Input. Connect this pin to a 5V bias supply. Place a high quality
bypass capacitor from this pin to GND.
25 (Exposed Pad) GND
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS9628A-00 October 2014


Features ® RT9628A High Voltage Synchronous Rec tified Triple Channel Buck MOSFET Drive r for Notebook Computer General Descri ption The RT9628A is a high frequency, triple Channel driver specifically desi gned to drive two power N-MOSFETs in ea ch channel of a synchronous-rectified B uck converter topology. It is especiall y suited for mobile computing applicati ons that require high efficiency and ex cellent thermal performance. This drive r, combined with Richtek's series of mu lti-phase Buck PWM controllers, provide s a complete core voltage regulator sol ution for advanced microprocessors. The drivers are capable of driving a 3nF l oad with fast rising/falling time and f ast propagation delay. This device impl ements bootstrapping on the upper gates with only a single external capacitor. This reduces implementation complexity and allows the use of higher performan ce, cost effective, N-MOSFETs. Adaptive shoot through protection is integrated to prevent both MOSFETs from conducting simultaneously. Featur.
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