RT9602GS RICHTEK [Richtek Technology Corporation], RT9602GS Datasheet

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RT9602GS

Manufacturer Part Number
RT9602GS
Description
Dual Channel Synchronous-Rectified Buck MOSFET Driver
Manufacturer
RICHTEK [Richtek Technology Corporation]
Datasheet
Dual Channel Synchronous-Rectified Buck MOSFET Driver
General Description
The RT9602 is a dual power channel MOSFET driver
specifically designed to drive four power N-Channel
MOSFETs in a synchronous-rectified buck converter
topology. These drivers combined with RT9237/A and
RT9241A/B series of Multi-Phase Buck PWM controllers
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 protect-ion 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.
Ordering Information
Note :
RichTek Pb-free and Green products are :
DS9602-08 March 2007
RT9602
RoHS compliant and compatible with the current require-
Suitable for use in SnPb or Pb-free soldering processes.
100%matte tin (Sn) plating.
ments of IPC/JEDEC J-STD-020.
Package Type
S : SOP-14
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Features
Applications
Pin Configurations
Drives Four N-Channel MOSFETs
Adaptive Shoot-Through Protection
Internal Bootstrap Devices
Small SOP-14 Package
5V to 12V Gate-Drive Voltages for Optimal Efficiency
Tri-State Input for Bridge Shutdown
Supply Under-Voltage Protection
Power ON Over-Voltage Protection
RoHS Compliant and 100% Lead (Pb)-Free
Core Voltage Supplies for Intel Pentium
Athlon
High Frequency Low Profile DC-DC Converters
High Current Low Voltage DC-DC Converters
TM
Microprocessors
LGATE1
LGATE2
PWM1
PWM2
PGND
PVCC
GND
(TOP VIEW)
5
7
2
3
4
6
SOP-14
14
13
12
11
10
9
8
VCC
PHASE1
UGATE1
BOOT1
BOOT2
UGATE2
PHASE2
RT9602
www.richtek.com
®
4 and AMD
®
1

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RT9602GS Summary of contents

Page 1

Dual Channel Synchronous-Rectified Buck MOSFET Driver General Description The RT9602 is a dual power channel MOSFET driver specifically designed to drive four power N-Channel MOSFETs in a synchronous-rectified buck converter topology. These drivers combined with RT9237/A and RT9241A/B series of ...

Page 2

RT9602 Typical Application Circuit www.richtek.com 2 DS9602-08 March 2007 ...

Page 3

Functional Pin Description Pin No. Pin Name 1 PWM1 Channel 1 PWM Input 2 PWM2 Channel 2 PWM Input 3 GND Ground Pin 4 LGATE1 Lower Gate Drive of Channel 1 5 PVCC Upper and Lower Gate Driver Power Rail ...

Page 4

RT9602 Function Block Diagram PWM1 PWM2 GND Absolute Maximum Ratings Supply Input Voltage, V ---------------------------------------------------------------------------- 15V CC Supply Voltage, PVCC -------------------------------------------------------------------------------- V BOOT Voltage BOOT PHASE Input Voltage, V ------------------------------------------------------------------------------------ GND - 0. PWM PHASE to ...

Page 5

Electrical Characteristics Parameter V Supply Current CC Bias Supply Current Power Supply Current Power-On Reset V Rising Threshold CC Hysteresis PWM Input Maximum Input Current PWM Floating Voltage PWM Rising Threshold PWM Falling Threshold UGATE Rise Time LGATE Rise Time ...

Page 6

RT9602 Application Information The RT9602 has power on protection function which held UGATE and LGATE low before VCC up cross the rising threshold voltage. After the initialization, the PWM signal takes the control. The rising PWM signal first forces the ...

Page 7

gs1 gs1 gs1 × gs2 gs2 gs2 According to the design of RT9602, before driving the gate ...

Page 8

RT9602 When layout the PCB, it should be very careful. The power- circuit section is the most critical one. If not configured properly, it will generate a large amount of EMI. The junction of Q1, Q2, L2 and Q3, Q4, ...

Page 9

Power Dissipation vs. Frequency 800 700 5nF = 600 C 500 C =C =2nF 400 U L 300 C =C =1nF U L 200 100 0 0 100 200 300 Frequency (kHz) Figure 5. Power Dissipation ...

Page 10

RT9602 V Vcc > P PEASE > lLGATE > l PWM1 > Time (25ms) Figure 9. High Side Direct Short Referring to Figure 7, when V CC turns on the LGATE to clamp the Phase through the low side MOSFET. ...

Page 11

Outline Dimension Symbol Richtek Technology Corporation Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 DS9602-08 March 2007 ...

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