BU90002GWZ Datasheet, PDF (1/24 Pages) Rohm – Step-down Switching regulators with Built-in Power MOSFET

BU90002GWZ
Datasheet
Single-chip Type with Built-in FET Switching Regulator Series
Step-down Switching regulators
with Built-in Power MOSFET
BU9000xGWZ series
●General Description
The BU9000xGWZ 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.
BU9000xGWZ 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.
●Features
Fast transient response
Automatic PFM/PWM operation
Forced PWM operation
Internal Soft Start
Under voltage lockout
Over current protection
Thermal shutdown
●Applications
Smart phones, Cell phones, Portable applications and
Micro DC/DC modules, USB accessories
●Package(s)
UCSP35L1
W(Typ.) x D(Typ.) x H(Max.)
1.30mm x 0.90mm x 0.40mm
●Typical Application Circuit(s)
Figure 1. Typical Application Circuit(s)
●Lineup
Part No.
BU90002GWZ
BU90003GWZ
BU90004GWZ
BU90005GWZ
BU90006GWZ
BU90007GWZ
Output
voltage
3.30V
1.20V
1.80V
2.50V
3.00V
1.25V
Input voltage
4.0V to 5.5V
2.3V to 5.5V
2.3V to 5.5V
2.3V to 5.5V
2.3V to 5.5V
2.3V to 5.5V
Switching frequency
5.4MHz to 6.6MHz
3.6MHz to 4.4MHz
4.8MHz to 6.0MHz
5.4MHz to 6.6MHz
5.4MHz to 6.6MHz
3.6MHz to 4.4MHz
Operating mode
MODE=L
MODE=H
Automatic
PFM/PWM
Forced PFM
Automatic
PFM/PWM
Forced PWM
●Pin Configuration(s)
(BOTTOM VIEW)
B1
B2
B3
M ODE
LX
FB
A1
A2
A3
V IN
EN
G ND
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 ○This product is not designed protection against radioactive rays
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TSZ02201-0F2F0AG00010-1-2
04.Jul.2012 Rev.001