RICHTEK RT9602CS Datasheet
Preliminary
RT9602
Dual Channel Synchronous-Rectified Buck MOSFET Driver
General Description
The RT9602 is a, twin power channel MOSFET driver
specifically designed to drive four power N-Channel
MOSFETs in a synchronous-rectified buck converter
topology. These drivers combined with a
RT9237/RT9241 series of Multi-Phase Buck PWM
controller provide a complete core voltage regulator
solution for advanced microprocessors.
The RT9602 can provide flexible gate driving for both
high side and low side drivers. This gives more
flexibility of MOSFET selection.
The output drivers in the RT9602 have the capability
to drive a 3000pF load with a 40ns propagation delay
and 80ns transition time. This device implements
bootstrapping on the upper gates with only a single
external capacitor required for each power channel.
This reduces implementation complexity and allows
the use of higher performance, cost effective, N-
Channel MOSFETs. Adaptive shoot-through
protection is integrated to prevent both MOSFETs
from conducting simultaneously.
The RT9602 can detect high side MOSFET drain-to-
source electrical short at power on and pull the 12V
power by low side MOS and cause power supply to
go into over current shutdown to prevent damage of
CPU.
Features
z
Drives Four N-Channel MOSFETs
z
Adaptive Shoot-Through Protection
z
Internal Bootstrap Devices
z
Small 14-Lead SOIC Package
z
5V to 12V Gate-Drive Voltages for Optimal
Efficiency
z
Tri-State Input for Bridge Shutdown
z
Supply Under-Voltage Protection
z
Power ON Over-Voltage Protection
Applications
Core Voltage Supplies for Intel Pentium 4 and
z
AMD Athlon
High Frequency Low Profile DC-DC Converters
z
High Current Low Voltage DC-DC Converters
z
TM
Microprocessors
Pin Configurations
Part Number Pin Configurations
RT9602CS
(Plastic SOP-14)
PWM1
PWM2
LGATE1
PVCC
PGND
LGATE2
GND
TOP VIEW
1
2
3
4
5
6
7
14
13
12
11
10
9
8
VCC
PHASE1
UGATE1
BOOT 1
BOOT 2
UGATE2
PHASE2
Ordering Information
RT9602
Package type
S : SOP-14
Operating temperature range
C: Commercial standard
DS9602-00 January 2002 www.richtek-ic.com.tw
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RT9602
Pin Description
Preliminary
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Pin Name Pin Function
PWM1 Channel 1 PWM Input
PWM2 Channel 2 PWM Input
GND Ground Pin
LGATE1 Lower Gate Drive of Channel 1
PVCC Upper and Lower Gate Driver Power Rail
PGND Lower Gate Driver Ground Pin
LGATE2 Lower Gate Drive of Channel 2
PHASE2
UGATE2 Upper Gate Drive of Channel 2
BOOT2 Floating Bootstrap Supply Pin of Channel 2
BOOT1 Floating Bootstrap Supply Pin of Channel 1
UGATE1 Upper Gate Drive of Channel 1
PHASE1
VCC Control Logic Power Supply
Connect this pin to phase point of channel 2.
Phase point is the connection point of high side MOSFET source and low side MOSFET drain
Connect this pin to phase point of channel 1.
Phase point is the connection point of high side MOSFET source and low side MOSFET drain
www.richtek-ic.com.tw DS9602-00 January 2002
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Function Block Diagram
Preliminary
RT9602
PWM1
PWM2
Internal
5V
19K
19K
Internal
5V
19K
19K
VCC
Control
Logic
Shoot-through
Protection
Pow e r-o n OVP
Shoot-through
Protection
Shoot-through
Protection
Pow e r-o n OVP
PVCC
PGND
PVCC
BOOT1
UGATE1
PHASE1
PVCC
LGATE1
PGND
BOOT2
UGATE2
PHASE2
PVCC
GND
Shoot-through
Protection
LGATE2
PGND
DS9602-00 January 2002 www.richtek-ic.com.tw
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