Datasheet
Single-chip Type with Built-in FET Switching Regulator Series
Step-down Switching regulators
with Built-in Power MOSFET
BU9000xGWZ series
●General Description
●Applications
The BU9000xGWZ are a high efficiency 6MHz
synchronous step-down switching regulator with ultra
low current PFM mode.
Smart phones, Cell phones, Portable applications,
Micro DC/DC modules, and USB accessories
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.
●Package(s)
W(Typ.) x D(Typ.) x H(Max.)
1.30mm x 0.90mm x 0.40mm
UCSP35L1
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.
●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
Figure 1. Typical Application Circuit(s)
Operating mode
●Lineup
Output
voltage
Part No.
Input voltage
Switching frequency
MODE=L
MODE=H
BU90002GWZ
BU90003GWZ
BU90004GWZ
BU90005GWZ
BU90006GWZ
BU90007GWZ
BU90008GWZ
BU90009GWZ
3.30V
1.20V
1.80V
2.50V
3.00V
1.25V
1.00V
1.30V
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
2.3V to 5.5V
2.3V to 5.5V
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
3.2MHz to 4.0MHz
3.8MHz to 4.8MHz
Automatic
PFM/PWM
Forced PFM
Forced PWM
Automatic
PFM/PWM
●Pin Configuration(s)
●Pin Description(s)
Pin No.
Symbol
Function
(BOTTOM VIEW)
A1
A2
A3
B1
B2
B3
VIN
EN
Power supply input pin
Enable pin
GND
MODE
LX
GND pin
Forced PWM mode pin
Inductor connection pin
Feedback voltage input pin
FB
Figure 2. Pin Configuration(s)
○Product structure:Silicon monolithic integrated circuit ○This product is not designed protection against radioactive rays
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TSZ02201-0F2F0AG00010-1-2
7.Jul.2015 Rev.007
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