Step-Down Converter. RT5710B Datasheet


RT5710B Converter. Datasheet pdf. Equivalent


Part Number

RT5710B

Description

CMCOT Synchronous Step-Down Converter

Manufacture

Richtek

Total Page 15 Pages
Datasheet
Download RT5710B Datasheet


RT5710B
RT5710B
6V, 1A, 1.5MHz, CMCOT Synchronous Step-Down Converter
General Description
The RT5710B is a simple, easy-to-use, 1A synchronous
step-down DC-DC converter with an input supply
voltage range of 2.5V to 6V. The device build-in an
accurate 0.6V reference voltage and integrates low
RDS(ON) power MOSFETs to achieve high efficiency in
a WDFN-6L 2x2 package.
The RT5710B adopts Current Mode Constant On-Time
(CMCOT) control architecture to provide an ultrafast
transient response with few external components and to
operate in nearly constant switching frequency over the
line, load, and output voltage range. The RT5710B
operates in Forced PWM that helps meet tight voltage
regulation accuracy requirements.
The RT5710B senses Low-Side FETs current for a
robust over-current protection. It features cycle-by-cycle
current limit protection and prevent the device from the
catastrophic damage in output short circuit, over current
or inductor saturation. An Internally soft-start function
prevents inrush current during start-up. The device also
includes input under-voltage lockout, output
under-voltage protection, and over-temperature
protection (thermal shutdown) to provide safe and
smooth operation in all operating conditions. The
RT5710B is offered in a WDFN-6L 2x2 package.
Features
1A Converter With Built-In 160m/110mLow
RDS(ON) Power FETs
Input Supply Voltage Range : 2.5V to 6V
Output Voltage Range : 0.6V to 3.4V
Current Mode Constant On-Time (CMCOT)
Control
Ultrafast Transient Response
No Needs For External Compensations
Optimized for Low-ESR Ceramic Output
Capacitors
0.6 2% High-Accuracy Feedback Reference
Voltage
LS FETs Protection for Robust Over-Current
Protection
Forced PWM Mode
Fixed Switching Frequency : 1.5MHz
Internally Soft-Start Function
Monotonic Start-Up for Pre-Biased Output
Input Under-Voltage Lockout (UVLO)
Output Under-Voltage Protection (UVP) with
Hiccup Mode
Enable Control
Available In WDFN-6L 2x2 Package
Applications
STB, Cable Modem, & xDSL Platforms
LCD TV Power Supply & Metering Platforms
General Purpose Point of Load (POL)
Simplified Application Circuit
VIN VIN LX
CIN RT5710B
EN
FB
GND
L
VOUT
R1
COUT
R2
Copyright © 2019 Richtek Technology Corporation. All rights reserved.
DS5710B-05 November 2019
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT5710B
RT5710B
Ordering Information
RT5710B
Package Type
QW : WDFN-6L 2x2 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
UVP Option
H : Hiccup
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.
Marking Information
36W
36 : Product Code
W : Date Code
Pin Configuration
(TOP VIEW)
NC 1
EN 2
VIN 3
6 FB
5 GND
7 4 LX
WDFN-6L 2x2
Functional Pin Description
Pin No.
Pin Name
Pin Function
1 NC No internal connection.
2 EN Enable control input.
3 VIN Supply voltage input. The RT5710B operates from a 2.5V 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
Sense
LX
VIN
LX
GND
Copyright © 2019 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS5710B-05 November 2019


Features RT5710B 6V, 1A, 1.5MHz, CMCOT Synchrono us Step-Down Converter General Descrip tion The RT5710B is a simple, easy-to-u se, 1A synchronous step-down DC-DC conv erter with an input supply voltage rang e of 2.5V to 6V. The device build-in an accurate 0.6V reference voltage and in tegrates low RDS(ON) power MOSFETs to a chieve high efficiency in a WDFN-6L 2x2 package. The RT5710B adopts Current Mo de Constant On-Time (CMCOT) control arc hitecture to provide an ultrafast trans ient response with few external compone nts and to operate in nearly constant s witching frequency over the line, load, and output voltage range. The RT5710B operates in Forced PWM that helps meet tight voltage regulation accuracy requi rements. The RT5710B senses Low-Side FE Ts current for a robust over-current pr otection. It features cycle-by-cycle cu rrent limit protection and prevent the device from the catastrophic damage in output short circuit, over current or i nductor saturation. An Internally soft-start function prevents .
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