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  Richtek Technology Electronic Components Datasheet  

RT7272B Datasheet

Synchronous Step-Down Converter

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RT7272B pdf
®
RT7272B
3A, 36V, 500kHz Synchronous Step-Down Converter
General Description
The RT7272B is a high efficiency, current mode
synchronous step-down DC/DC converter that can deliver
up to 3A output current over a wide input voltage range
from 4.5V to 36V. The device integrates a 150mΩ high
side and a 80mΩ low side MOSFET to achieve high
conversion efficiency up to 95%. The current mode control
architecture supports fast transient response and simple
compensation circuit.
A cycle-by-cycle current limit function provides protection
against shorted output and an internal soft-start eliminates
input current surge during start-up. The RT7272B provides
complete protection functions such as input under voltage
lockout, output under voltage protection, over current
protection and thermal shutdown.
The RT7272B is available in the thermal enhanced SOP-8
(Exposed Pad) package.
Ordering Information
RT7272B
Package Type
SP : SOP-8 (Exposed Pad-Option 2)
Note :
Lead Plating System
G : Green (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 4.5V to 36V Input Voltage Range
z 3A Output Current
z Internal N-MOSFETs
z Current Mode Control
z Fixed Frequency Operation : 500kHz
z Adjustable Output Voltage from 0.8V to 30V
z High Efficiency Up to 95%
z Stable with Low ESR Ceramic Output Capacitors
z Cycle-by-Cycle Current Limit
z Input Under Voltage Lockout
z Output Under Voltage Protection
z Thermal Shutdown Protection
z Adjustable Current Limit
z RoHS Compliant and Halogen Free
Applications
z Distributed Power Systems
z Pre-Regulator for Linear Regulators
z Notebook Computers
z Point of Load Regulator in Distributed Power System
z Digital Set-top Boxes
z Personal Digital Recorders
z Broadband Communications
z Flat Panel TVs and Monitors
z Vehicle Electronics
Simplified Application Circuit
VIN
CIN
VIN BOOT
RT7272B
SW
CB L
RLIM
FB
RL CC RC
GND
COMP
VOUT
R1
COUT
R2
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS7272B-01 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  

RT7272B Datasheet

Synchronous Step-Down Converter

No Preview Available !

RT7272B pdf
RT7272B
Pin Configurations
(TOP VIEW)
SW
BOOT
EN
GND
8
27
GND
36
9
45
VIN
RLIM
COMP
FB
SOP-8 (Exposed Pad)
Marking Information
RT7272B
GSPYMDNN
RT7272BGSP : Product Number
YMDNN : Date Code
Functional Pin Description
Pin No.
Pin Name
Pin Function
1 SW
2 BOOT
3 EN
4,
9 (Exposed Pad)
GND
5 FB
6 COMP
Switch Node Connect to external L-C filter.
Bootstrap Supply for High Side Gate Drive. A 100nF or greater capacitor is
recommended to connect from BOOT pin to SW pin.
Enable Control Input. A logic-high enables the converter; a logic-low forces the
device into shutdown mode.
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum thermal dissipation.
Feedback Input. This pin is connected to the converter output. It is used to set
the output of the converter to regulate to the desired value via an resistive
divider.
Compensation Node. COMP is used to compensate the regulation control loop.
Connect a series RC network from COMP to GND. In some cases, an additional
capacitor from COMP to GND is required.
7
RLIM
Current Limit Setting. Connect to a resistor to determine current limit.
8
VIN
Power Input. The input voltage range is from 4.5V to 36V. Must bypass with a
suitable large ceramic capacitor.
Function Block Diagram
VIN
Internal
Regulator
Shutdown
Comparator
VA VCC
1.2V +
VCC
Oscillator
Foldback
Control
Slope Comp
Current Sense
Amplifier
+
-
RSENSE VA
- 0.4V +
UV
Lockout
-
5kΩ
EN
Comparator
-
UV
Comparator
SQ
+
1.7V +
- RQ
Current
Comparator
150mΩ
80mΩ
BOOT
SW
GND
VCC
SS
0.8V
+
-+EA
RLIM
FB COMP
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS7272B-01 January 2013
Free Datasheet http://www.datasheet4u.com/


Part Number RT7272B
Description Synchronous Step-Down Converter
Maker Richtek
Total Page 15 Pages
PDF Download
RT7272B pdf
RT7272B Datasheet PDF
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