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  Richtek Technology Electronic Components Datasheet  

RT7262A Datasheet

Synchronous Step-Down Converter

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®
RT7262A
2A, 21V 500kHz Synchronous Step-Down Converter
General Description
The RT7262A is a synchronous step-down regulator with
integrated power MOSFETs. It achieves 2A 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 adjustable soft-start
reduces the stress on the input source at start-up.
The RT7262A requires a minimal number of readily
available external components, providing a compact
solution.
Ordering Information
RT7262A
Package Type
QW : WDFN-14L 4x3 (W-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.
Features
z Wide Input Range : 4.5V to 21V
z Adjustable Output from 0.808V to 15V
z 2A Output Current
z 150mΩ/60mΩ Internal Power MOSFET Switch
z Internal Compensation Minimizes External Parts
z 500kHz Fixed Switching Frequency
z Synchronized External Clock from 300kHz to 2MHz
z Adjustable Soft-Start
z Cycle-by-Cycle Over Current Limit
z Thermal Shutdown Protection
z Available in SOP-8 (Exposed Pad) and WDFN-14L
4x3 Packages
z RoHS Compliant and Halogen Free
Applications
z Distributive Power Systems
z Battery Charger
z DSL Modems
z Pre-Regulator for Linear Regulators
Simplified Application Circuit
VIN
Chip Enable
VIN BOOT
CIN RT7262A
SW
EN/SYNC
VCC
FB
CC GND
CBOOT L
RT R1
R2
VOUT
COUT
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS7262A-01 September 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
Free Datasheet http://www.datasheet4u.com/


  Richtek Technology Electronic Components Datasheet  

RT7262A Datasheet

Synchronous Step-Down Converter

No Preview Available !

RT7262A
Marking Information
RT7262AZQW
07 : Product Code
07 YM
DNN
YMDNN : Date Code
RT7262AZSP
RT7262A
ZSPYMDNN
RT7262AZSP : Product Number
YMDNN : Date Code
Pin Configurations
(TOP VIEW)
VIN 1
SW 2
SW 3
SW 4
SW 5
BOOT 6
EN/SYNC 7
GND
15
14 AGND
13 GND
12 GND
11 VCC
10 SS
9 PGOOD
8 FB
WDFN-14L 4x3
VIN
SW
SW
BOOT
8
27
GND
36
9
45
GND
VCC
FB
EN/SYNC
Functional Pin Description
SOP-8 (Exposed Pad)
Pin No.
WDFN-14L 4x3
SOP-8
(Exposed Pad)
11
2, 3, 4, 5
2, 3
Pin Name
VIN
SW
Pin Function
Power 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.
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.
6
4
BOOT
Bootstrap for High Side Gate Driver. Connect a 100nF or greater
capacitor from SW to BOOT to power the high side switch driver.
Enable or External Frequency Synchronization Input. For
7
5
EN/SYNC
automatic start-up, connect the EN/SYNC pin to VIN with a
100kΩ resistor. The switching frequency can be changed by an
external clock applying to the SYNC pin.
Feedback Input. FB senses the output voltage via an external
8
6 FB
resistive voltage divider. The feedback reference voltage is
0.808V typically.
9
--
PGOOD
Power Good Indicator is an Open Drain Output. The power good
rising/falling threshold is 90%/70% of regulation output voltage.
10
-- SS
Soft-Start Control Input. Connect a capacitor from SS to GND to
set the soft-start period.
11
7
VCC
Bias Supply. Decouple with 0.1μF to 0.22μF capacitor between
this pin and GND.
12, 13, 15
(Exposed Pad)
8,
9 (Exposed Pad)
GND
Ground. The exposed pad must be soldered to a large PCB and
connected to GND for maximum power dissipation.
14
--
AGND
Analog Ground. Connect this pin to the system ground in PCB
layout.
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS7262A-01 September 2012
Free Datasheet http://www.datasheet4u.com/


Part Number RT7262A
Description Synchronous Step-Down Converter
Maker Richtek
Total Page 17 Pages
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