RT6158A Buck-Boost Converter Datasheet

RT6158A Datasheet, PDF, Equivalent


Part Number

RT6158A

Description

2A Buck-Boost Converter

Manufacture

Richtek

Total Page 14 Pages
Datasheet
Download RT6158A Datasheet


RT6158A
®
RT6158A
High Efficiency, Low Quiescent, 2A Buck-Boost Converter
General Description
The RT6158A converter is a high efficiency single inductor
converter which can operate with wide input voltage 2.5V
to 5V such as battery which is higher or lower than the
output voltage and it can supply the load current up to 2A.
The maximum peak current in the switches is limited to a
typical value of 4.5A. 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 Buck-Boost
operates at 2MHz typical switching frequency in full
synchronous operation.
The RT6158A operates in Pulse Frequency Modulation
(PFM) mode for increasing efficiency. The PFM mode can
be disabled, forcing the RT6158A to operate at a fixed
switching frequency operation at 2MHz. The RT6158A can
also be synchronized with external frequency at MODE
pin from 2.2MHz to 2.6MHz. The RT6158A output voltage
is programmable using an external resistor divider; the
output voltage range is from 2.1V to 5.2V.
Applications
Cellular Telephones
Wifi Module
Tablet PC
Portable Instrument
Features
Input Voltage Range : 2.5V to 5V
Adjustable Output Voltage : 2.1V to 5.2V by External
Divided Resistors
Up to 2A Maximum Load Capability for VIN = 3V,
VOUT = 3.5V
Up to 96% Efficiency (VIN = 4.2V, VOUT = 3.5V, ILOAD =
0.5A)
OCP, OVP, OTP, UVLO and SCP Function
2MHz Switching Frequency
5μA Non-Switching Low Quiescent Current
Forced PWM and Automatic PFM/PWM Mode
Selection
Output Fast Discharge Function
Automatic / Seamless Step Up and Step Down
Mode Transitions
25-Ball WL-CSP Package
Ordering Information
RT6158A
Note :
Package Type
WSC : WL-CSP-25B 2.07x2.33 (BSC)
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.
Simplified Application Circuit
L1
VIN
CIN
LX1 LX2
PVIN
RT6158A
VOUT
AVIN
EN
FB
MODE
AGND
PGND
VOUT
R1
CFF
COUT
R2
Copyright ©2019 Richtek Technology Corporation. All rights reserved.
DS6158A-05 August 2019
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT6158A
RT6158A
Marking Information
0M YM
DNN
0M : Product Code
YMDNN : Date Code
Pin Configuration
(TOP VIEW)
A1 A2 A3 A4 A5
PVIN PVIN PVIN PVIN AVIN
B1 B2
LX1 LX1
B3 B4
LX1 LX1
B5
EN
C1 C2 C3 C4 C5
PGND PGND PGND MODE AGND
D1 D2 D3 D4 D5
LX2 LX2 LX2 LX2 AGND
E1 E2 E3 E4
VOUT VOUT VOUT VOUT
E5
FB
WL-CSP-25B 2.07x2.33 (BSC)
Functional Pin Description
Pin No.
Pin Name
A1, A2, A3, A4 PVIN
A5 AVIN
B1, B2, B3, B4 LX1
Pin Function
Power input supply. The input voltage range is from 2.5V to 5V after soft-start is
finished. Connect input capacitors between this pin and PGND with a wide PCB
trace.
Analog input supply. AVIN Connect to PVIN.
Switching node 1. Connect to inductor.
B5
C1, C2, C3
EN
PGND
C4
C5, D5
MODE
AGND
Chip enable. This input must not be left floating and must be terminated.
Power ground. Connect to this pin with the shortest path for power transmission
to reduce parasitic component effect.
High for PFM mode, low for FCCM mode. This pin also can be used to
synchronize switching frequency with 2.2MHz to 2.6MHz. This input must not
be left floating and must be terminated.
Analog ground. This is the signal reference ground for the IC.
D1, D2, D3, D4 LX2
E1, E2, E3, E4 VOUT
E5 FB
Switching node 2. Connect to inductor.
Output voltage pin. PCB trace length from VOUT to the output filter capacitor
should be as short and wide as possible.
Output voltage feedback. The typical value of the voltage at the FB pin is
800mV.
Copyright ©2019 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS6158A-05 August 2019


Features ® RT6158A High Efficiency, Low Quiesce nt, 2A Buck-Boost Converter General De scription The RT6158A converter is a hi gh efficiency single inductor converter which can operate with wide input volt age 2.5V to 5V such as battery which is higher or lower than the output voltag e and it can supply the load current up to 2A. The maximum peak current in the switches is limited to a typical value of 4.5A. Feedback loop is internally c ompensated for both Buck and Boost oper ation and it provides seamless transiti on between Buck and Boost modes and opt imal transient response. The Buck-Boost operates at 2MHz typical switching fre quency in full synchronous operation. T he RT6158A operates in Pulse Frequency Modulation (PFM) mode for increasing ef ficiency. The PFM mode can be disabled, forcing the RT6158A to operate at a fi xed switching frequency operation at 2M Hz. The RT6158A can also be synchronize d with external frequency at MODE pin f rom 2.2MHz to 2.6MHz. The RT6158A output voltage is programmable.
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