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參數(shù)資料
| 型號： | ML4901 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | High Current Synchronous Buck Controller For DC/DC conversion(用于DC/DC變換的大電流同步補(bǔ)償控制器（12V到2.1V～3.5V變換）) |
| 中文描述： | 高電流同步降壓控制器，用于直流/直流轉(zhuǎn)換（用于直流/直流變換的大電流同步補(bǔ)償控制器（12V的到大于2.1V?3.5V的變換）） |
| 文件頁數(shù)： | 1/8頁 |
| 文件大?。?/td> | 239K |
| 代理商： | ML4901 |
April 1997
PRELIMINARY
ML4901
High Current Synchronous Buck Controller
1
GENERAL DESCRIPTION
The ML4901 high current synchronous buck controller has
been designed to provide high efficiency DC/DC
conversion for next generation processors such as the
Pentium
Pro from Intel
.
The ML4901 controller, when combined with 2 external
MOSFETs, generates output voltages between 2.1V and
3.5V from a 12V supply. The output voltage is selected via
an internal 4-bit DAC. Output currents in excess of 14A
can be attained at efficiencies greater than 90%.
The ML4901 can be enabled/disabled via the
SHDN
pin.
While disabled, the output of the regulator is completely
isolated from the circuit’s input supply. The ML4901
employs fixed-frequency PWM control combined with a
dual mode control loop to provide excellent load transient
response.
BLOCK DIAGRAM
(Pin Configuration Shown for 16-Pin SOIC Version)
FEATURES
I
Designed to meet Pentium
Pro power supply
requirements
I
DC regulation to +1% maximum
I
Proprietary circuitry provides transient response of +5%
maximum over 300mA to 14A load range
I
Programmable output voltage (2.1V to 3.5V) is set by an
onboard 4-bit DAC
I
Synchronous buck topology for maximum power
conversion efficiency
I
Fixed frequency operation for easier system integration
I
Integrated antishoot-through logic, short circuit
protection, and UV lockout
I
Shutdown control provides load isolation
3.5V
REFERENCE
7
VREF
GND
P DRV
N DRV
ISENSE
PWR GOOD
15
UVLO
13
10
14
VDD
+
–
16
PROTECT
+
–
VDAC
1
D0
2
D1
3
D2
4
D3
4 BIT DAC
4.4V
10.4V
8
5
SHDN
+
–
+
–
VFB
VDAC + 3%
VDAC - 3%
VFB
9
PWR GND
12
CONTROL
LOGIC
+
–
-95mV
+
–
VDAC
+
–
COMP
11
200kHz
35μA
+
–
+
–
VFB
VDAC - 3%
VDAC - 10%
VDAC + 3%
VDAC + 10%
6
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4901CS | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:High Current Synchronous Buck Controller |
| ML4901CT | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:High Current Synchronous Buck Controller |
| ML4902 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:High Current Synchronous Buck Controller |
| ML4902CT | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:High Current Synchronous Buck Controller |
| ML4902CT UP WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
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