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What is RT9214?

This electronic component, produced by the manufacturer "Richtek Technology", performs the same function as "5V/12V Synchronous Buck PWM DC-DC Controller".


RT9214 Datasheet PDF - Richtek Technology

Part Number RT9214
Description 5V/12V Synchronous Buck PWM DC-DC Controller
Manufacturers Richtek Technology 
Logo Richtek Technology Logo 


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5Vh/e1e2tV4US.cyonmchronous Buck PWM DC-DC CoRnTtr9o2l1le4rGeneral Description
taSThe RT9214 is a high efficiency synchronous buck PWM
acontrollers that generate logic-supply voltages in PC based
.Dsystems. These high performance , single output devices
winclude internal soft-start, frequency compensation
wnetworks and integrates all of the control, output
wadjustment, monitoring and protection functions into a
Features
z Operating with 5V or 12V Supply Voltage
z Drives All Low Cost N-Channel MOSFETs
z Voltage Mode PWM Control
z 300kHz Fixed Frequency Oscillator
z Fast Transient Response:
High-Speed GM Amplifier
single package.
The device operating at fixed 300kHz frequency provides
man optimum compromise between efficiency, external
ocomponent size, and cost.
.cAdjustable over-current protection (OCP) monitors the
voltage drop across the RDS(ON) of the lower MOSFET for
Usynchronous buck PWM DC-DC controller. The over-
t4current function cycles the soft-start in 4-times hiccup
mode to provide fault protection, and in an always hiccup
emode for under-voltage protection.
Full 0 to 100% Duty Ratio
z Internal Soft-Start
z Adaptive Non-Overlapping Gate Driver
z Over-Current Fault Monitor on MOSFET, No
Current Sense Resistor Required
Applications
z Graphic Card
z Motherboard, Desktop Servers
z IA Equipments
z Telecomm Equipments
z High Power DC-DC Regulators
eOrdering Information
hRT9214
SPackage Type
S : SOP-8
taOperating Temperature Range
C : Commercial Standard
aP : Pb Free with Commercial Standard
Pin Configurations
(TOP VIEW)
BOOT
UGATE
GND
LGATE
2
3
4
8 PHASE
7 OPS
6 FB
5 VCC
SOP-8
.DTypical Application Circuit
w+5V to +12V D1
1N4148
VIN
+3.3V/+5V/+12V
w R1
10
w omC1
U.c1uF
1 BOOT UGATE 2
5 VCC
PHASE 8
6
FB
RT9214
OPS
7
3 GND
LGATE 4
C2
0.1uF
ROCSET
C3
1uF
Q1
MU
L1
3uH
C4
470uF
VOUT
C6 to C8
Q2 1000uFx3
ML
et4Disable >
Q3
2N7002
heR2 R3
32 68
www.DataSDS9214-02 December 2004
R4 C5
200-1k 0.1-0.33uF
www.richtek.com
1

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RT9214 equivalent
RT9214
Parameter
Symbol
Test Conditions
Min Typ Max Units
Error Amplifier (GM)
E/A Transconductance
gm
Open Loop DC Gain
AO
PWM Controller Gate Drivers (VCC = 12V)
Upper Gate Source
IUGATE
Upper Gate Sink
Lower Gate Source
Lower Gate Sink
Dead Time
RUGATE
ILGATE
RLGATE
TDT
VBOOT VPHASE = 12V,
VUGATE VPHASE = 6V
VBOOT VPHASE = 12V,
VUGATE VPHASE = 1V
VCC = 12V, VLGATE = 6V
VCC = 12V, VLGATE = 1V
-- 0.7 --
-- 90 --
ms
dB
300 500 -- mA
-- 4 8
300 500 --
-- 3 5
-- -- 100
mA
ns
Protection
FB Under-Voltage Trip
OC Current Source
Soft-Start Interval
FBUVT
IOC
TSS
FB Falling
VPHASE = 0V
70 75 80
35 40 45
-- 3.5 --
%
µA
ms
Note 1. Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These are for
stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the
operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended
periods may remain possibility to affect device reliability.
Note 2. Devices are ESD sensitive. Handling precaution recommended.
Note 3. The device is not guaranteed to function outside its operating conditions.
Note 4. θJA is measured in the natural convection at TA = 25°C on a low effective thermal conductivity test board of
JEDEC 51-3 thermal measurement standard.
DS9214-02 December 2004
www.richtek.com
5


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1. Synchronous Buck PWM DC-DC Controller

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