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  Richtek Technology Electronic Components Datasheet  

RT7276 Datasheet

(RT7275 / RT7276) Synchronous Step-Down Converter

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®
RT7275/76
3A, 18V, 700kHz ACOTTM Synchronous Step-Down Converter
General Description
The RT7275/76 are high-performance 700kHz 3A step-
down regulators with internal power switches and
synchronous rectifiers. They feature quick transient
response using their Advanced Constant On-Time
(ACOTTM) control architecture that provides stable
operation with small ceramic output capacitors and without
complicated external compensation, among other benefits.
The input voltage range is from 4.5V to 18V and the output
is adjustable from 0.765V to 8V.
The proprietary ACOTTM control improves upon other fast-
response constant on-time architectures, achieving nearly
constant switching frequency over line, load, and output
voltage ranges. Since there is no internal clock, response
to transients is nearly instantaneous and inductor current
can ramp quickly to maintain output regulation without
large bulk output capacitance. The RT7275/76 are stable
with and optimized for ceramic output capacitors.
With internal 90mΩ switches and 60mΩ synchronous
rectifiers, the RT7275/76 display excellent efficiency and
good behavior across a range of applications, especially
for low output voltages and low duty cycles. Cycle-by-
cycle current limit, input under-voltage lock-out,
externally-adjustable soft-start, output under- and over-
voltage protection, and thermal shutdown provide safe and
smooth operation in all operating conditions.
The RT7275 and RT7276 are each available in WDFN-10L
3x3 and PTSSOP-14 packages, with exposed thermal
pads.
Simplified Application Circuit
VIN
Input Signal
Power Good
RT7275/76
VIN SW
VINR
EN
BOOT
FB
PGOOD
PVCC
VOUT
SS
PGND GND
VOUT
Features
z Fast Transient Response
z Steady 700kHz Switching Frequency
` At all Load Currents (RT7275)
` Discontinuous Operating Mode at Light Load
(RT7276)
z 3A Output Current
z Advanced Constant On-Time (ACOTTM) Control
z Optimized for Ceramic Output Capacitors
z 4.5V to 18V Input Voltage Range
z Internal 90mΩ Switch and 60mΩ Synchronous
Rectifier
z 0.765V to 8V Adjustable Output Voltage
z Externally-adjustable, Pre-biased Compatible Soft-
Start
z Cycle-by-Cycle Current Limit
z Optional Output Discharge Function (PTSSOP-14
Only)
z Output Over- and Under-voltage Shut-down
Applications
z Industrial and Commercial Low Power Systems
z Computer Peripherals
z LCD Monitors and TVs
z Green Electronics/Appliances
z Point of Load Regulation for High-Performance DSPs,
FPGAs, and ASICs
z Not Recommended for Sink/Source Applications
Fast-Transient Response
RT7275
VOUT
(20mV/Div)
IOUT
(2A/Div)
VOUT = 12V, VOUT = 1.05V, IOUT = 0 to 3A
Time (100μs/Div)
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS7275/76-00 January 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
Free Datasheet http://www.datasheet4u.com/


  Richtek Technology Electronic Components Datasheet  

RT7276 Datasheet

(RT7275 / RT7276) Synchronous Step-Down Converter

No Preview Available !

RT7275/76
Ordering Information
RT7275/76
Package Type
CP : TSSOP-14 (Exposed Pad)
QW : WDFN-10L 3x3 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Operating Mode
75 : Continuous Switching Mode
76 : Discontinuous Operating Mode
at Light Load
Note :
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.
Pin Configurations
(TOP VIEW)
VOUT
FB
PVCC
SS
GND
PGOOD
EN
14
2 13
3 12
4 PGND 11
5 10
6 15 9
78
VINR
VIN
BOOT
SW
SW
PGND
PGND
TSSOP-14 (Exposed Pad)
EN 1
FB 2
PVCC 3
SS 4
PGOOD 5
10 VIN
9 VIN
8 BOOT
7 SW
11 SW
WDFN-10L 3x3
Marking Information
RT7275GCP
RT7275
GCPYMDNN
RT7275GCP : Product Number
YMDNN : Date Code
RT7276GCP
RT7276
GCPYMDNN
RT7276GCP : Product Number
YMDNN : Date Code
RT7275GQW
4C=YM
DNN
4C= : Product Code
YMDNN : Date Code
RT7276GQW
2C=YM
DNN
2C= : Product Code
YMDNN : Date Code
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS7275/76-00 January 2013
Free Datasheet http://www.datasheet4u.com/


Part Number RT7276
Description (RT7275 / RT7276) Synchronous Step-Down Converter
Maker Richtek
Total Page 24 Pages
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