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參數(shù)資料
| 型號： | ML4895 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Synchronous Buck Controller For DC/DC conversion(用于DC/DC變換的同步補償控制器（5.9V～15V到2.5V～4V變換）) |
| 中文描述： | 同步降壓控制器，用于直流/直流轉(zhuǎn)換（用于直流/直流變換的同步補償控制器（高于全?15V的到為2.5V?4V變換）） |
| 文件頁數(shù)： | 1/10頁 |
| 文件大?。?/td> | 248K |
| 代理商： | ML4895 |
July 1998
ML4895
Synchronous Buck Controller
1
BLOCK DIAGRAM
FEATURES
I
Regulation to ±3% maximum
I
Adjustable output synchronous buck (2.5V to 4V)
I
Wide input voltage range (5.9V to 15V)
I
Power conversion efficiencies of >90% over 3 decades
of output current
I
Integrated antishoot-through logic
I
Shutdown control provides load isolation and minimum
sleep mode power consumption
GENERAL DESCRIPTION
The ML4895 synchronous buck controller has been
designed to provide high efficiency DC/DC conversion for
portable products. The ML4895 can deliver a user
programmable 2.5V to 4V output from input voltages of
5.9V to 15V.
The ML4895 drives external P- and N-channel MOSFETs
in a synchronous buck topology, allowing an overall
conversion efficiency of greater than 90% over an output
current range exceeding three decades, with an output
current capability of up to 5A.
The regulator can be disabled via the
SHDN
pin. While
disabled, the output of the regulator is completely
isolated from the circuit’s input supply, and the supply
current is reduced to less than 5μA to help extend battery
life.
OSCILLATOR
ONE SHOT
2.5V
–7mV
S
R
Q
Q
SHOOT-THRU
PROTECTION
–
+
VREG
VIN
2
VFB
3
ISENSE
6
N DRV
7
P DRV
8
VIN
5
GND
VREG
4
SHDN
+
–
COMP
–
+
COMP
LINEAR
REGULATOR
SLEEP
LOGIC
VIN
VIN
1
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