RICHTEK RT9600 Datasheet
Preliminary
RT9600
Synchronous-Rectified Buck MOSFET Drivers
General Description
The RT9600 is a high frequency, dual MOSFET
driver specifically designed to drive two power N-
Channel MOSFETs in a synchronous-rectified buck
converter topology. This driver combined with a
RT9237 Multi-Phase Buck PWM controller form a
complete core-voltage regulator solution for
advanced microprocessors.
The RT9600 drives both the lower/upper gate in a
synchronous-rectifier bridge to 12V. Independent
driving of upper gate through PVCC pin is
achievable. Recommended PVCC ranges are from
8 to 12V for Rds(on) concern. This drive-voltage
flexibility provides the advantage of optimizing
applications involving trade-offs between switching
losses and conduction losses.
The output drivers in the RT9600 have the capacity
to efficiently switch power MOSFETs at frequencies
up to 2MHz. Each driver is capable of driving a
3000pF load with a 30ns propagation delay and
50ns transition time. RT9600 implements
bootstrapping on the upper gate with only an
external capacitor required. 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.
Features
z
Drives Two N-Channel MOSFETs
z
Adaptive Shoot-Through Protection
z
Internal Bootstrap Device
z
Supports High Switching Frequency
−
Fast Output Rise Time
−
Propagation Delay 30ns
z
Small SOP-8 Package
z
Dual Gate-Drive Voltages for Optimal Efficiency
z
Three-State Input for Bridge Shutdown
z
Supply Under Voltage Protection
z
High Side Short Circuit Protection
Applications
Core Voltage Supplies for Intel Pentium 4,
z
z High Frequency Low Profile DC-DC Converters
z High Current Low Voltage DC-DC Converters
AMD
AthlonTM Microprocessors
Pin Configurations
Part Number Pin Configurations
BOOT
PWM
GND
TOP VIEW
1
2
3
4
PHASE
8
PVCC
7
6
VCC
LGATE
5
RT9600CS
(Plastic SOP-8)
UGATE
Ordering Information
RT9600
Package Type
S : SOP-8
Operating temperature range
C: Commercial standard
DS9600-00 July 2001 www.richtek-ic.com.tw
1
RT9600
Pin Description
Preliminary
Pin No.
Pin Name Pin Function
UGATE Upper Gate Drive Output. Connect to gate of high-side power N-Channel MOSFET
1
BOOT Floating bootstrap supply pin for upper gate drive.
2
PWM Input PWM signal for controlling the driver.
3
GND Ground
4
LGATE Lower gate drive output. Connect to gate of low-side power N-Channel MOSFET.
5
VCC +12V Supply Voltage
6
PVCC Upper Gate Drive Supply Bias. Typical +12V
7
PHASE
8
Connect this pin to the source of the high-side MOSFET and the drain of the low-side
MOSFET
Function Block Diagram
V
CC
Internal
5V
500K
PWM
500K
Control
Logic
High Side
Short-CKT
Protection
PVCC
Shootthrough
Protect
BOOT
UGATE
Phase
V
CC
LGATE
GND
Typical Application Circuit
+12V
C
8
1µF
+12V
PWM
C
13
1µF
7
3
6
VCC
PVCC
RT96 00
PWM
GND
BOOT
UGATE
PHASE
LGATE
4
2
C
1µF
1
8
5
PHB95NO3LT
11
Q
4
www.richtek-ic.com.tw DS9600-00 July 2001
2
C
9
100µF
SANYO OS-CON 16V
Q
3
PHB83NO3LT
L3
1µH
C
15
1000µF
R
2.4K
10
2.4K
R
13
There 2 PC B tr ac e ha ve to pa rallel and place R ne ar t o PWM I C
VCORE
C
16
1000µF
ISEN2
ISN2
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