RT8061A Step-Down Converter Datasheet

RT8061A Datasheet, PDF, Equivalent


Part Number

RT8061A

Description

Synchronous Step-Down Converter

Manufacture

Richtek

Total Page 12 Pages
Datasheet
Download RT8061A Datasheet


RT8061A
®
RT8061A
3A, 1MHz, Synchronous Step-Down Converter
General Description
The RT8061A is a high efficiency synchronous, step-down
DC/DC converter. Its input voltage range from 2.7V to 5.5V
that provides an adjustable regulated output voltage from
0.6V to VIN while delivering up to 3A of output current.
The internal synchronous low on resistance power
switches increase efficiency and eliminate the need for
an external Schottky diode. The switching frequency is
fixed internally at 1MHz. The 100% duty cycle provides
low dropout operation, hence extending battery life in
portable systems. Current mode operation with internal
compensation allows the transient response to be
optimized over a wide range of loads and output capacitors.
The RT8061A is operated in PWM/PSM mode to achieve
high efficiency for a wide load range. The RT8061A is
available in a WDFN-10L 3x3 package.
Ordering Information
RT8061A
Package Type
QW : WDFN-10L 3x3 (W-Type)
Lead Plating System
Z : ECO (Ecological Element with
Halogen Free and Pb free)
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.
Features
High Efficiency : Up to 95%
Low RDS(ON) Internal Switches : 69mΩ/49mΩ at VIN
= 5V
Fixed Frequency : 1MHz
No Schottky Diode Required
0.6V Reference Allows Low Output Voltage
PWM/PSM Mode Operation
Low Dropout Operation : 100% Duty Cycle
OCP, UVP, OVP, OTP
RoHS Compliant and Halogen Free
Applications
Portable Instruments
Battery-Powered Equipment
Notebook Computers
Distributed Power Systems
IP Phones
Digital Cameras
Pin Configuration
(TOP VIEW)
NC 1
LX 2
LX 3
PGOOD 4
EN 5
10 PVIN
9 PVIN
8 SVIN
7 NC
11 6 FB
WDFN-10L 3x3
Marking Information
11 : Product Code
11 YM
DNN
YMDNN : Date Code
Copyright ©2019 Richtek Technology Corporation. All rights reserved.
DS8061A-06 June 2019
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT8061A
RT8061A
Typical Application Circuit
PGOOD
RT8061A
4 PGOOD LX 2, 3
LOUT
R1
VIN
9, 10 PVIN
CIN 8 SVIN
FB 6
C1
RFB1
RFB2
Chip Enable
5 EN
GND 11 (Exposed Pad)
CFF
VOUT
COUT
Functional Pin Description
Pin No.
Pin Name
Pin Function
1, 7 NC
No internal connection.
2, 3 LX
Switch node. Connection this pin to the inductor.
4
PGOOD
Power good indicator. This pin is an open drain logic output that is pulled to
ground when the output voltage is less than 90% of the target output voltage.
5 EN Enable control. Pull high to turn on. Do not float.
6
FB
Feedback. This pin receives the feedback voltage from a resistive voltage divider
connected across the output.
8
SVIN
Signal input. Decouple this pin to GND with at least 1F ceramic cap.
9, 10
PVIN
Power input. Decouple this pin to GND with at least 4.7F ceramic cap.
11 (Exposed Pad) GND
The exposed pad must be soldered to a large PCB and connected to GND for
maximum power dissipation.
Functional Block Diagram
EN
PGOOD
FB
PGOOD
VREF
0.6V
EA
EN
OSC
Output
Clamp
Slope
Com
ISEN
OC
Limit
Int-SS
POR
0.72V
0.54V
0.4V
OV
PGOOD
UV
Control
Logic
OTP
Driver
NISEN
Zero Current
100
PVIN
LX
SVIN
Copyright ©2019 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS8061A-06 June 2019


Features ® RT8061A 3A, 1MHz, Synchronous Step-D own Converter General Description The RT8061A is a high efficiency synchronou s, step-down DC/DC converter. Its input voltage range from 2.7V to 5.5V that p rovides an adjustable regulated output voltage from 0.6V to VIN while deliveri ng up to 3A of output current. The inte rnal synchronous low on resistance powe r switches increase efficiency and elim inate the need for an external Schottky diode. The switching frequency is fixe d internally at 1MHz. The 100% duty cyc le provides low dropout operation, henc e extending battery life in portable sy stems. Current mode operation with inte rnal compensation allows the transient response to be optimized over a wide ra nge of loads and output capacitors. The RT8061A is operated in PWM/PSM mode to achieve high efficiency for a wide loa d range. The RT8061A is available in a WDFN-10L 3x3 package. Ordering Informat ion RT8061A Package Type QW : WDFN-10L 3x3 (W-Type) Lead Plating System Z : ECO (Ecological Element wit.
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