RT6154A Datasheet, PDF (1/15 Pages) Richtek Technology Corporation – High Efficiency Single Inductor Buck-Boost Converter

®
RT6154A/B
High Efficiency Single Inductor Buck-Boost Converter
General Description
The RT6154A/B is a high efficiency single inductor Buck-
Boost Converter which can operate with wide input voltage
such as battery which is higher or lower than the output
voltage and it can supply the load current up to 4A. The
maximum peak current in the switches is limited to a
typical value of 5A at V_IN = 3.6V and 2.6A at V_IN = 2.1V.
The RT6154A/B feedback loop is internally compensated
for both Buck and Boost operation and it provides seamless
transition between Buck and Boost modes and optimal
transient response. The RT6154A/B operates at 2.4MHz
typical switching frequency in full synchronous operation.
The RT6154A/B operates in Pulse Skipped Modulation
(PSM) mode for increasing efficiency during low power
RF transmission modes. The Power Save Mode can be
disabled, forcing the RT6154A/B to operate at a fixed
switching frequency operation at 2.4MHz. The RT6154A/
B can also be synchronized with external frequency from
2.2MHz to 2.6MHz. The RT6154A output voltage is
programmable using an external resistor divider, and the
RT6154B is fixed internally to 3.3V.
Features
 Operates from a Single Li-ion Cell : 1.8V to 5.5V
 Adjustable Output Voltage : 1.8V to 5.5V
 3A Maximum Load Capability for V_IN > 3.6V,
V_OUT = 3.3V
 Power Save Mode (PSM) for Improving Low Output
Power Efficiency
 Fixed Frequency Operation at 2.4MHz and
Synchronization Possible from 2.2MHz to 2.6MHz
 Up to 96% Efficiency
 Input Current Limit
 Internal Compensation
 RoHS Compliant and Halogen Free
Applications
 Cellular Phones
 Portable Hard Disk Drives
 PDAs
Pin Configuration
(TOP VIEW)
VINA 1
GND 2
FB 3
VOUT ⁴
VOUT 5
LX2 6
LX2 7
PGND
15
14 PGOOD
13 PS/SYNC
12 EN
11 VIN
10 VIN
9 LX1
8 LX1
WDFN-14AL 4x3
Simplified Application Circuit
LX1 LX2
RT6154A
V_IN
VIN
VOUT
V_OUT
VINA
FB
Enable
EN
PGOOD
PS/SYNC
GND PGND
Power Good
Output
Copyright ©2017 Richtek Technology Corporation. All rights reserved.
DS6154A/B-03 May 2017
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1