RT7295C SynchronousStep-Down Converter Datasheet

RT7295C Datasheet, PDF, Equivalent


Part Number

RT7295C

Description

SynchronousStep-Down Converter

Manufacture

Richtek

Total Page 14 Pages
Datasheet
Download RT7295C Datasheet


RT7295C
Design
Sample &
Tools
Buy
® RT7295C
3.5A, 18V, 500kHz ACOTTMSynchronous Step-Down Converter
General Description
The RT7295C is a synchronous step-down converter with
Advanced Constant On-Time (ACOTTM) mode control. The
ACOTTM provides a very fast transient response with few
external components. The low impedance internal
MOSFET supports high efficiency operation with wide input
voltage range from 4.3V to 18V. The proprietary circuit of
the RT7295C enables to support all ceramic capacitors.
The output voltage can be adjusted between 0.6V and 8V.
Ordering Information
RT7295C
Package Type
J6F : TSOT-23-6 (FC)
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.
Pin Configurations
(TOP VIEW)
SW VIN EN
654
23
BOOT GND FB
TSOT-23-6 (FC)
Features
4.3V to 18V Input Voltage Range
3.5A Output Current
Advanced Constant On-Time Control
Fast Transient Response
Support All Ceramic Capacitors
Up to 95% Efficiency
500kHz Switching Frequency
Adjustable Output Voltage from 0.6V to 8V
Cycle-by-Cycle Current Limit
Input Under-Voltage Lockout
Hiccup Mode Under-Voltage Protection
Thermal Shutdown
RoHS Compliant and Halogen Free
Applications
Industrial and Commercial Low Power Systems
Computer Peripherals
LCD Monitors and TVs
Green Electronics/Appliances
Point of Load Regulation for High-Performance DSPs,
FPGAs, and ASICs
Marking Information
05=DNN
05= : Product Code
DNN : Date Code
Simplified Application Circuit
RT7295C
VIN VIN BOOT
SW
Enable
EN FB
GND
VOUT
Copyright ©2016 Richtek Technology Corporation. All rights reserved.
DS7295C-08 October 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT7295C
RT7295C
Functional Pin Description
Pin No.
Pin Name
Pin Function
1
BOOT
Bootstrap Supply for High-Side Gate Driver. Connect a 0.1F ceramic capacitor
between the BOOT and SW pins.
2 GND
Power Ground.
3 FB
4 EN
Feedback Voltage Input. The pin is used to set the output voltage of the converter
via a resistive divider. The converter regulates VFB to 0.6V
Enable Control Input. Connect EN to a logic-high voltage to enable the IC or to a
logic-low voltage to disable. Do not leave this high impedance input unconnected.
5 VIN
Power Input. The input voltage range is from 4.3V to 18V. Must bypass with a
suitable large ceramic capacitor at this pin.
6 SW
Switch Node. Connect to external L-C filter.
Function Block Diagram
BOOT VIN
VIN
Reg
VIBIAS
PVCC
VREF
Min off
PVCC
OC
UV & OV
PVCC
SW
Ripple
Gen.
+--
Comparator
Control
Driver
GND SW
VIN
EN On-Time
UGATE
LGATE
SW
SW
GND
FB EN
Operation
The RT7295C is a synchronous step-down converter with
advanced constant on-time control mode. Using the ACOT
control mode can reduce the output capacitance and fast
transient response. It can minimize the component size
without additional external compensation network.
UVLO Protection
To protect the chip from operating at insufficient supply
voltage, the UVLO is needed. When the input voltage of
VIN is lower than the UVLO falling threshold voltage, the
device will be lockout.
Current Protection
The inductor current is monitored via the internal switches
cycle-by-cycle. Once the output voltage drops under UV
threshold, the RT7295C will enter hiccup mode.
Copyright ©2016 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
Thermal Shutdown
When the junction temperature exceeds the OTP
threshold value, the IC will shut down the switching
operation. Once the junction temperature cools down and
is lower than the OTP lower threshold, the converter will
autocratically resume switching.
is a registered trademark of Richtek Technology Corporation.
DS7295C-08 October 2016


Features Design Sample & Tools Buy ® RT7295C 3.5A, 18V, 500kHz ACOTTMSynchronous S tep-Down Converter General Description The RT7295C is a synchronous step-down converter with Advanced Constant On-Ti me (ACOTTM) mode control. The ACOTTM pr ovides a very fast transient response w ith few external components. The low im pedance internal MOSFET supports high e fficiency operation with wide input vol tage range from 4.3V to 18V. The propri etary circuit of the RT7295C enables to support all ceramic capacitors. The ou tput voltage can be adjusted between 0. 6V and 8V. Ordering Information RT729 5C Package Type J6F : TSOT-23-6 (FC) Note : Lead Plating System G : Green ( Halogen Free and Pb Free) Richtek prod ucts are :  RoHS compliant and comp atible with the current requirements of IPC/JEDEC J-STD-020.  Suitable for use in SnPb or Pb-free soldering proce sses. Pin Configurations (TOP VIEW) SW VIN EN 654 23 BOOT GND FB TSOT-23-6 ( FC) Features  4.3V to 18V Input Voltage Range  3.5A Output Curren.
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