BU90054GWZ Datasheet, PDF (1/18 Pages) Rohm – Fast transient response

Datasheet
Single-chip Type with Built-in FET Switching Regulator Series
1.0A, Step-down Switching regulators
with Built-in Power MOSFET
BU90054GWZ
●General Description
The BU90054GWZ are a high efficiency 6MHz
synchronous step-down switching regulator with ultra
low current PFM mode.
It provides up to 1.0A load current and an input voltage
range from 3.0V to 5.5V, optimized for battery powered
portable applications.
BU90054GWZ has a mode control pin that allows the
user to select Forced PWM(Pulse Width Modulation)
mode or PFM(Pulse Frequency Modulation) and PWM
auto change mode utilized power save operation at light
load current.
●Applications
Smart phones, Cell phones, Portable applications and
Micro DC/DC modules, USB accessories
●Package(s)
UCSP30L1
W(Typ.) x D(Typ.) x H(Max.)
1.30mm x 0.90mm x 0.33mm
●Typical Application Circuit(s)
●Features
 Fast transient response
 Automatic PFM/PWM operation
 Forced PWM operation
 Internal Soft Start
 Under voltage lockout
 Over current protection
 Thermal shutdown
2.3～5.5V
VIN
4.7uF
EN
1.0uH
LX
VOUT
FB
4.7uF
GND MODE
Figure 1. Typical Application Circuit(s)
●Lineup
Part No.
BU90054GWZ
Output
voltage
Input voltage Switching frequency
1.80V
2.3V to 5.5V 4.8MHz to 6.0MHz
Operating mode
MODE=L
MODE=H
Automatic
PFM/PWM
Forced PWM
●Pin Configuration(s)
(BOTTOM VIEW)
B1
B2
MODE
LX
A1
A2
VIN
EN
B3
FB
A3
GND
Figure 2. Pin Configuration(s)
●Pin Description(s)
Pin No.
A1
A2
A3
B1
B2
B3
Symbol
VIN
EN
GND
MODE
LX
FB
Function
Power supply input pin
Enable pin
GND pin
Forced PWM mode pin
Inductor connection pin
Feedback voltage input pin
○Product structure：Silicon monolithic integrated circuit
www.rohm.com
© 2014 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
○This product is not designed protection against radioactive rays
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TSZ02201-0F1F0AG00060-1-2
8.Dec.2014 Rev.002