Step-Down Converter. RT5712F Datasheet


RT5712F Converter. Datasheet pdf. Equivalent


Part Number

RT5712F

Description

6V CMCOT Synchronous Step-Down Converter

Manufacture

Richtek

Total Page 14 Pages
Datasheet
Download RT5712F Datasheet


RT5712F
RT5712F
2A, 1MHz, 6V CMCOT Synchronous Step-Down Converter
General Description
The RT5712F is a high efficiency synchronous
step-down DC-DC converter. Its input voltage range is
from 2.7V to 6V and provides an adjustable regulated
output voltage from 0.6V to 3.4V while delivering up to
2A of output current.
The internal synchronous low on-resistance power
switches increase efficiency and eliminate the need for
an external Schottky diode. The Current Mode
Constant-On-time (CMCOT) operation with internal
compensation allows the transient response to be
optimized over a wide range of loads and output
capacitors.
Applications
STB, Cable Modem, & xDSL Platforms
LCD TV Power Supply & Metering Platforms
General Purpose Point of Load (POL)
Features
Efficiency Up to 95%
RDSON 100mHS / 70mLS
VIN Range 2.7V to 6V
VREF 0.6V with 1.5% Accuracy
CMCOTControl Loop Design for Best
Transient Response, Robust Loop Stability with
Low-ESR (MLCC) COUT
Fixed Soft-Start 1.2ms
Cycle-by-Cycle Over Current Protection
Input Under Voltage Lockout
Output Under Voltage Protection (UVP Hiccup)
Thermal Shutdown Protection
Marking Information
RT5712FHGQW
3S : Product Code
3SW
W : Date Code
Ordering Information
RT5712F
Package Type
QW : WDFN-6L 2x2 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
UVP Option
H : Hiccup
L : Latch-Off
Note :
Richtek products are :
RoHS compliant and compatible with the current
requirements of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
RT5712FLGQW
3R : Product Code
3RW
W : Date Code
Pin Configuration
(TOP VIEW)
PGOOD 1
EN 2
VIN 3
6 FB
5 GND
7 4 LX
WDFN-6L 2x2
Simplified Application Circuit
VIN VIN LX
CIN RT5712F
EN
FB
PGOOD
GND
L
VOUT
R1
COUT
R2
Copyright © 2019 Richtek Technology Corporation. All rights reserved.
DS5712F-04 June 2019
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT5712F
RT5712F
Functional Pin Description
Pin No.
Pin Name
Pin Function
Power good indicator. The output of this pin is an open-drain with external
1 PGOOD pull-up resistor. PGOOD is pulled up when the FB voltage is within 90%,
otherwise it is LOW.
2 EN Enable control input.
3 VIN Supply voltage input. The RT5712F operates from a 2.7V to 6V input.
4 LX Switch node.
5, 7 (Exposed Pad) GND
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum thermal dissipation.
6 FB Feedback.
Functional Block Diagram
EN
VIN
UVLO
OTP
Shut Down
Control
Ton LX
Error
Comparator
FB
VREF
- Amplifier
+
Logic
+ Control Driver
-
RC
CCOMP
Current
Limit
Detector
+
- Current LX
Sense
VIN
LX
GND
PGOOD
Operation
The RT5712F is a synchronous low voltage step-down
converter that can support the input voltage range from
2.7V to 6V and the output current can be up to 2A. The
RT5712F uses a constant on-time, current mode
architecture. In normal operation, the high side
P-MOSFET is turned on when the switch controller is
set by the comparator and is turned off when the Ton
comparator resets the switch controller.
Low side MOSFET peak current is measured by
internal RSENSE. The error amplifier EA adjusts
COMP voltage by comparing the feedback signal (VFB)
from the output voltage with the internal 0.6V reference.
When the load current increases, it causes a drop in
the feedback voltage relative to the reference, then the
COMP voltage rises to allow higher inductor current to
match the load current.
Copyright © 2019 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
UV Comparator
If the feedback voltage (VFB) is lower than threshold
voltage 0.2V, the UV comparator's output will go high
and the switch controller will turn off the high side
MOSFET. The output under voltage protection is
designed to operate in Hiccup and Latch-off mode.
PGOOD Comparator
When the feedback voltage (VFB) is higher than
threshold voltage 0.54V, the PGOOD open drain output
will be high impedance. The internal PGOOD MOSFET
is typical 100. The PGOOD signal delay time from EN
is about 2ms.
is a registered trademark of Richtek Technology Corporation.
DS5712F-04 June 2019


Features RT5712F 2A, 1MHz, 6V CMCOT Synchronous Step-Down Converter General Descriptio n The RT5712F is a high efficiency sync hronous step-down DC-DC converter. Its input voltage range is from 2.7V to 6V and provides an adjustable regulated ou tput voltage from 0.6V to 3.4V while de livering up to 2A of output current. Th e internal synchronous low on-resistanc e power switches increase efficiency an d eliminate the need for an external Sc hottky diode. The Current Mode Constant -On-time (CMCOT) operation with interna l compensation allows the transient res ponse to be optimized over a wide range of loads and output capacitors. Applic ations  STB, Cable Modem, & xDSL Pla tforms  LCD TV Power Supply & Meteri ng Platforms  General Purpose Point of Load (POL) Features  Efficiency Up to 95%  RDSON 100m HS / 70m LS  VIN Range 2.7V to 6V  VREF 0 .6V with 1.5% Accuracy  CMCOT™ Control Loop Design for Best Transient Response, Robust Loop Stability with Low-ESR (MLCC) COUT  Fixed Soft-Start 1.2ms  Cyc.
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