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參數(shù)資料
| 型號： | L6928TR |
| 廠商： | 意法半導體 |
| 英文描述： | High efficiency monolithic synchronous step down regulator |
| 中文描述： | 高效率單片同步降壓穩(wěn)壓器 |
| 文件頁數(shù)： | 1/16頁 |
| 文件大?。?/td> | 167K |
| 代理商： | L6928TR |
October 2006
Rev 4
1/16
16
L6928
High efficiency monolithic synchronous step down regulator
General features
■
2V to 5.5V battery input range
■
High efficiency: up to 95%
■
Internal synchronous switch
■
No external schottky required
■
Extremely low quiescent current
■
1
μ
A max shutdown supply current
■
800mA max output current
■
Adjustable output voltage from 0.6V
■
Low drop-out operation: up to 100% duty cycle
■
Selectable low noise/low consumption mode at
light load
■
Power good signal
■
±1% output voltage accuracy
■
Current-mode control
■
1.4MHz switching frequency
■
Externally synchronizable
from 1MHz to 2MHz
■
OVP
■
Short circuit protection
Applications
■
Battery-powered equipments
■
Portable instruments
■
Cellular phones
■
PDAs and hand held terminals
■
DSC
■
GPS
Application test circuit
Description
The device is dc-dc monolithic regulator
specifically designed to provide extremely high
efficiency.
L6928 supply voltage can be as low as 2V
allowing its use in single Li-ion cell supplied
applications. Output voltage can be selected by
an external divider down to 0.6V. Duty Cycle can
saturate to 100% allowing low drop-out operation.
The device is based on a 1.4MHz fixed-frequency,
current mode-architecture.
Low Consumption Mode operation can be
selected at light load conditions, allowing
switching losses to be reduced. L6928 is
externally synchronizable with a clock which
makes it useful in noise-sensitive applications.
Other features like Powergood, Overvoltage
protection, Shortcircuit protection and Thermal
Shutdown (150°C) are also present.
MSOP8
VFQFPN8
www.st.com
L 4.7
μ
H
SYNC
LX
VFB
C1
10
μ
F
6.3V
C2
220pF
C4
10
μ
F
6.3V
R2
200K
R3
500K
R1
100K
V
IN
=2V to 5.5V
V
OUT
=1.8V
V
CC
RUN
COMP
GND
PGOOD
D01IN1528
7
6
1
8
3
5
2
4
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|---|---|
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