Text preview for : rt9214.PDF part of Various rt9214 . Electronic Components Datasheets Various rt9214.PDF
Back to : rt9214.PDF | Home
RT9214
5V/12V Synchronous Buck PWM DC-DC Controller
General Description Features
The RT9214 is a high efficiency synchronous buck PWM Operating with 5V or 12V Supply Voltage
controllers that generate logic-supply voltages in PC based Drives All Low Cost N-Channel MOSFETs
systems. These high performance , single output devices Voltage Mode PWM Control
include internal soft-start, frequency compensation 300kHz Fixed Frequency Oscillator
networks and integrates all of the control, output Fast Transient Response :
adjustment, monitoring and protection functions into a High-Speed GM Amplifier
single package. Full 0 to 100% Duty Ratio
Internal Soft-Start
The device operating at fixed 300kHz frequency provides
Adaptive Non-Overlapping Gate Driver
an optimum compromise between efficiency, external
Over-Current Fault Monitor on MOSFET, No
component size, and cost.
Current Sense Resistor Required
Adjustable over-current protection (OCP) monitors the RoHS Compliant and 100% Lead (Pb)-Free
voltage drop across the RDS(ON) of the lower MOSFET for
synchronous buck PWM DC-DC controller. The over- Applications
current function cycles the soft-start in 4-times hiccup Graphic Card
mode to provide fault protection, and in an always hiccup Motherboard, Desktop Servers
mode for under-voltage protection. IA Equipments
Telecomm Equipments
Ordering Information High Power DC-DC Regulators
RT9214
Package Type
Pin Configurations
S : SOP-8 (TOP VIEW)
SP : SOP-8 (Exposed Pad-Option 1)
Operating Temperature Range BOOT 8 PHASE
P : Pb Free with Commercial Standard UGATE 2 7 OPS
GND 3 6 FB
G : Green (Halogen Free with Commer-
LGATE 4 5 VCC
cial Standard)
Note : SOP-8
Richtek Pb-free and Green products are :
RoHS compliant and compatible with the current require- BOOT PHASE
8
ments of IPC/JEDEC J-STD-020. UGATE 2 7 OPS
NC
Suitable for use in SnPb or Pb-free soldering processes. GND 3
9
6 FB
100% matte tin (Sn) plating. LGATE 4 5 VCC
SOP-8 (Exposed Pad)
DS9214-13 September 2007 www.richtek.com
1
RT9214
Typical Application Circuit
VIN
+5V to +12V D1 +3.3V/+5V/+12V
1N4148 RBOOT
2.2
C2 C3 C4
0.1uF 1uF 470uF
R1
10 1 RUGATE Q1
BOOT 2
UGATE
2.2 MU
5 8
VCC PHASE L1 VOUT
C1 3uH
6 RT9214 7 ROCSET
1uF FB OPS
3 4 Q2 R
GND LGATE
ML
C
Disable > Q3 C6 to C8
3904 1000uFx3
R2
32
R3
68 VOUT = VREF