RT5771D Step-Down Converter Datasheet

RT5771D Datasheet, PDF, Equivalent


Part Number

RT5771D

Description

Synchronous Step-Down Converter

Manufacture

Richtek

Total Page 11 Pages
Datasheet
Download RT5771D Datasheet


RT5771D
®
RT5771D
3A, 1MHz, Synchronous Step-Down Converter
General Description
The RT5771D is a high efficiency synchronous, step-down
DC-DC converter. Its input voltage ranges 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 RT5771D is available in the WDFN-10L 3x3 package.
Ordering Information
RT5771D
Package Type
QW : WDFN-10L 3x3 (W-Type)
Lead Plating System
G : Green (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.
Marking Information
M1= : Product Code
M1=YM
DNN
YMDNN : Date Code
Features
High Efficiency : Up to 95%
High Efficiency at Light Load
Low RDS(ON) Power Switches : 69mΩ/49mΩ
Fixed Frequency : 1MHz
No Schottky Diode Required
Internal Compensation
0.6V Reference Allows Low Output Voltage
Low Dropout Operation : 100% Duty Cycle
OCP, UVP, OTP
Applications
Portable Instruments
Battery Powered Equipments
Notebook Computers
Distributed Power Systems
IP Phones
Digital Cameras
Pin Configuration
(TOP VIEW)
FB 1
VCC 2
VIN 3
GND 4
GND 5
10 EN
9 PGOOD
8 NC
7 SW
11 6 SW
WDFN-10L 3x3
Copyright ©2019 Richtek Technology Corporation. All rights reserved.
DS5771D-01 June 2019
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT5771D
RT5771D
Typical Application Circuit
VIN
PGOOD
Enable
CIN
10µF
R3
100k
L
RT5771D
1.5µH
3 VIN
SW 6, 7
2 VCC
C1
1µF
9 PGOOD
FB 1
CFF R1
560pF 6.2k
R2
8.2k
10 EN
GND
4, 5,
11 (Exposed
Pad)
VOUT
COUT 1.05V
22µF x 2
VOUT (V)
3.3
2.5
1.8
1.5
1.2
1
Table 1. Recommended Component Selection
R1 (k)
R2 (k)
CFF (pF)
L (H)
37 8.2 430
2
26 8.2 430
2
16.5 8.2 510 1.5
12.3 8.2 560 1.5
8.2 8.2 620 1.5
5.6 8.2 680 1.5
COUT (F)
22 x 2
22 x 2
22 x 2
22 x 2
22 x 2
22 x 2
Functional Pin Description
Pin No.
Pin Name
Pin Function
1 FB
Feedback input. This pin receives the feedback voltage from a resistive
voltage divider connected across the output.
2
VCC
Supply voltage input. Decouple this pin to GND with at least 1F ceramic
capacitor.
3 VIN Power input. Decouple this pin to GND with at least 10F ceramic capacitor.
4, 5,
11 (Exposed Pad)
GND
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
6, 7 SW
Switch node. Connect this pin to the inductor.
8 NC No internal connection.
Power good indicator. This pin is an open drain logic output. The PGOOD will
9
PGOOD
be pulled to ground when the output voltage is less than 90% of the target
output voltage.
10 EN
Enable control input. Pull high the EN pin to turn on the converter.
Copyright ©2019 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS5771D-01 June 2019


Features ® RT5771D 3A, 1MHz, Synchronous Step-D own Converter General Description The RT5771D is a high efficiency synchronou s, step-down DC-DC converter. Its input voltage ranges from 2.7V to 5.5V that provides an adjustable regulated output voltage from 0.6V to VIN while deliver ing up to 3A of output current. The int ernal synchronous low on-resistance pow er switches increase efficiency and eli minate the need for an external Schottk y diode. The switching frequency is fix ed internally at 1MHz. The 100% duty cy cle provides low dropout operation, hen ce extending battery life in portable s ystems. Current mode operation with int ernal compensation allows the transient response to be optimized over a wide r ange of loads and output capacitors. Th e RT5771D is available in the WDFN-10L 3x3 package. Ordering Information RT5 771D Package Type QW : WDFN-10L 3x3 (W -Type) Lead Plating System G : Green ( Halogen Free and Pb Free) Note : Rich tek products are :  RoHS compliant and compatible with the cur.
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