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  Richtek Technology Electronic Components Datasheet  

RT8288A Datasheet

500kHz Synchronous Step-Down Converter

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RT8288A pdf
®
RT8288A
4A, 21V 500kHz Synchronous Step-Down Converter
General Description
The RT8288A is a synchronous step-down regulator with
an internal power MOSFET. It achieves 4A of continuous
output current over a wide input supply range with excellent
load and line regulation. Current mode operation provides
fast transient response and eases loop stabilization.
Fault condition protection includes cycle-by-cycle current
limiting and thermal shutdown. An internal soft-start
minimizes external parts count and internal compensation
circuitry.
The RT8288A requires a minimal number of readily
available external components, providing a compact
solution.
Ordering Information
RT8288A
Package Type
SP : SOP-8 (Exposed Pad-Option 2)
Note :
Lead Plating System
Z : ECO (Ecological Element with
Halogen Free and Pb free)
Richtek 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.
Marking Information
RT8288A
ZSPYMDNN
RT8288AZSP : Product Number
YMDNN : Date Code
Features
z 4A Output Current
z Internal Soft-Start
z 120mΩ/40mΩ Internal Power MOSFET Switch
z Internal Compensation Minimizes External Parts
Count
z Fixed 500kHz Frequency
z Thermal Shutdown Protection
z Cycle-by-Cycle Over Current Protection
z Wide 4.5V to 21V Operating Input Range
z Adjustable Output from 0.808V to 15V
z Available in an SOP-8 (Exposed Pad) Package
z RoHS Compliant and Halogen Free
Applications
z Distributive Power Systems
z Battery Charger
z DSL Modems
z Pre-Regulator for Linear Regulators
Pin Configurationshttp://www.DataSheet4U.net/
(TOP VIEW)
VIN
SW
SW
BOOT
8
27
GND
36
9
45
GND
VCC
FB
EN
SOP-8 (Exposed Pad)
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS8288A-03 June 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
datasheet pdf - http://www.DataSheet4U.net/


  Richtek Technology Electronic Components Datasheet  

RT8288A Datasheet

500kHz Synchronous Step-Down Converter

No Preview Available !

RT8288A pdf
RT8288A
Typical Application Circuit
VIN
Chip Enable
CIN
22µF
1 VIN
BOOT 4
RT8288A
SW 2, 3
5 EN
6
FB
8, 9 (Exposed Pad)
GND
VCC 7
CBOOT
100nF
L
RT
CC
0.1µF
R2
R1
VOUT
COUT
VOUT (V)
5
3.3
2.5
1.8
1.5
1.2
1.05
Table 1. Recommended Components Selection
R1 (kΩ)
R2 (kΩ)
RT (kΩ)
L (μH)
75 14.46
0
4.7
75 24.32
0
3.6
75 35.82
0
3.6
5 4.07 30
2
5 5.84 39
2
5
10.31
47
2
5
16.69
47
1.5
COUT (μF)
22 x 2
22 x 2
22 x 2
22 x 2
22 x 2
22 x 2
22 x 2
Function Pin Description
Pin No.
Pin Name
http://www.DataSheet4U.net/
Pin Function
1 VIN
Supply Input. VIN supplies the power to the IC, as well as the step-down converter
switches. Drive VIN with a 4.5V to 21V power source. Bypass VIN to GND with a
suitably large capacitor to eliminate noise on the input to the IC.
2, 3 SW
Switch Node. SW is the switching node that supplies power to the output. Connect
the output LC filter from SW to the output load. Note that a capacitor is required
from SW to BOOT to power the high side switch.
4 BOOT
5 EN
6 FB
7 VCC
8,
9 (Exposed
Pad)
GND
High Side Gate Drive Boost Input. BOOT supplies the drive for the high side
N-MOSFET switch. Connect a 100nF or greater capacitor from SW to BOOT to
power the high side switch.
Chip Enable (Active High). For automatic start-up, connect the EN pin to VIN with a
100kΩ resistor.
Feedback Input. FB senses the output voltage to regulate said voltage. Drive FB
with a resistive voltage divider from the output voltage. The feedback threshold is
0.808V.
Bias Supply. Decouple with 0.1μF to 0.22μF capacitor. The capacitance should be
no more than 0.22μF.
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS8288A-03 June 2012
datasheet pdf - http://www.DataSheet4U.net/


Part Number RT8288A
Description 500kHz Synchronous Step-Down Converter
Maker Richtek
Total Page 14 Pages
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