RT9237 Datasheet, PDF (1/15 Pages) List of Unclassifed Manufacturers – MULTI-PHASE DC/DC CONTROLLER FOR CPU CORE POWER SUPPLY

Preliminary
RT9237
Multi-Phase DC/DC Controller for CPU Core Power Supply
General Description
The RT9237 is a multi-phase buck DC/DC controller
integrated with all control functions for high
performance processor VRM. The RT9237 drives 2,
3 or 4 buck switching stages operating in interleaved
phase set automatically. The multi-phase
architecture provides high output current while
maintaining low power dissipation on power devices
and low stress on input and output capacitors. The
high equivalent operating frequency also reduces
the component dimension and the output voltage
ripple in load transient.
RT9237 regulates both easily set voltage and
current loops. Precise current sharing for power
stage is achieved by differential input current sense
and processing circuit. The settings of current
sense, droop tuning and over current protection are
independent to compensation circuit of voltage loop.
The feature greatly facilitates the flexibility of CPU
power supply design and tuning.
The RT9237 uses a 5-bit DAC of 1.1V to 1.85V
(25mV/step) output with load current droop
compensation to meet the strict VRM transient
requirement. The IC monitors the VCORE voltage
for PGOOD and over voltage protection. Soft start,
over current protection and programmable under
voltage lockout are also provided to assure the
safety of microprocessor and power system.
Applications
z Power Supply for Server and Workstation
z Power Supply for High Current Microprocessor
Ordering Information
RT9237… …
Package Type
S : SOP-28
Operating temperature range
C: Commercial standard
Features
z Multi-Phase Power Conversion with Automatic
Phase Selection
z VRM 9.0 DAC Output with Active Droop
Compensation for Fast Load Transient
z Precise Channel Current Sharing with
Differential Sense Input
z Hiccup Mode Over Current Protection
z Programmable Under Voltage Lockout and
Soft Start
z High Ripple Frequency, (Channel Frequency
200KHz) Times Channel Number
Pin Configurations
Part Number
Pin Configurations
RT9237CS
(Plastic SOP-28)
TOP VIEW
VID4 ¹
VID3 2
VID2 3
VID1 4
VID0 5
COMP 6
FB 7
ADJ 8
GND 9
VSEN 10
IRMP ¹¹
DVD 12
28 VDD
27 PGOOD
26 PWM4
25 ISP4
24 ISP1
23 PWM1
22 PWM2
21 ISP2
20 ISP3
19 PWM3
18 ISN1
17 ISN2
IMAX 13
SS 14
16 ISN3
15 ISN4
DS9237-00 January 2002
www.richtek-ic.com.tw
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