RT9212 Datasheet, PDF (1/14 Pages) Richtek Technology Corporation – Dual 5V Synchronous Buck PWM DC-DC and Linear Power Controller

Preliminary
RT9212
Dual 5V Synchronous Buck PWM DC-DC and Linear Power
Controller
General Description
The RT9212 is a 3-in-one power controller delivers high
efficiency and tight regulation from two voltage regulating
synchronous buck PWM DC-DC and one linear power
controllers.
The RT9212 can control two independent output voltages
adjustment in range of 0.8V to 4.0V with 180 degrees
channel to channel phase operation to reduce input ripple.
In dual power supply application the RT9212 monitors the
output voltage of both Channel 1 and Channel 2. An
independent PGOOD (power good) signal is asserted for
each channel after the soft-start sequence has completed,
and the output voltage is within ±15% of the set point. The
linear controller drives an external transistor to provide an
adjustable output voltage.
Built-in over-voltage protection prevents the output from
going above 137.5% of the set point by holding the lower
MOSFET on and the upper MOSFET off. Adjustable over-
current protection (OCP) monitors the voltage drop across
the R_DS(ON) of the upper MOSFET for each synchronous
buck PWM DC-DC controller individually.
Ordering Information
RT9212
Package Type
C : TSSOP-24
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Note :
RichTek Pb-free and Green 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.
`100% matte tin (Sn) plating.
Features
z Operating with Single 5V Supply Voltage
z Drives All Low Cost N-MOSFETs
z Voltage Mode PWM Control
z 300kHz Fixed Frequency Oscillator
z Fast Transient Response :
Full 0% to 100% Duty Ratio
z Internal Soft-Start
z Adaptive Non-Overlapping Gate Driver
z Over-Current Fault Monitor on V_CC, No Current
Sense Resistor Required
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Graph Card
z Motherboard, Desktop Servers
z IA Equipments
z Telecomm Equipments
z High Power DC-DC Regulators
Pin Configurations
(TOP VIEW)
UGATE1
BOOT1
PHASE1
NC
FB1
COMP1
NC
NC
GNDA
PHASE2
BOOT2
UGATE2
24
2
23
3
22
4
21
5
20
6
19
7
18
8
17
9
16
10
15
11
14
12
13
TSSOP-24
PGND1
LGATE1
PVCC1
OCSET1/SD
OCSET2/SD
PGOOD
FB2
FBL
DRV
VCC
LGATE2
PGND2
DS9212-05 March 2007
www.richtek.com
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