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參數(shù)資料
| 型號(hào)： | ML4903 |
| 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1.8V～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1.8?3.5V的變換）） |
| 文件頁數(shù)： | 1/12頁 |
| 文件大?。?/td> | 275K |
| 代理商： | ML4903 |
July 1999
ML4903
High Current Synchronous Buck Controller
1
GENERAL DESCRIPTION
The ML4903 high current synchronous buck controller
provides high efficiency DC/DC conversion to generate
V
CCP
for processors such as the Pentium
Pro and Pentium
II from Intel
.
The ML4903 controller, when combined with two external
MOSFETs, generates output voltages between 1.8V and
3.5V from a 12V supply. The output voltage is selected via
an internal 2 chord 4-bit DAC. In the upper range, the
output can be set between 2.1V and 3.5V in 100mV steps.
In the lower range, the output can be set between 1.8V
and 2.05V in 50mV steps. Output currents in excess of
20A can be attained at efficiencies greater than 80%.
The ML4903 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 ML4903
employs fixed-frequency PWM control combined with a
sophisticated control loop enhancement circuit to provide
excellent load transient response.
FEATURES
I
Designed to meet Pentium Pro and Pentium II VRM
power supply requirements
I
DC regulation to +1% maximum
I
Proprietary circuitry provides transient response of ±5%
maximum over a 0A to 14A load range
I
Programmable output voltage (1.8V to 3.5V) is set by
an onboard 2 chord 4-bit DAC
I
Synchronous buck topology for maximum power
conversion efficiency
I
Fixed frequency operation for easier system integration
I
Integrated anti-shootthrough logic, short circuit
protection, shutdown, and UV lockout
BLOCK DIAGRAM
3.5V
REFERENCE
9
VREF
GND
P DRV
N DRV
ISENSE
PWR GOOD
19
UVLO
16
12
17
8
VDD
+
–
18
VCC
+
–
5
RANGE
VDAC
1
D0
2
D1
3
D2
4
D3
2 CHORD
4 BIT DAC
4.4V
10.5V
20
PROTECT
3.5V
5V
10
6
SHDN
+
–
+
–
+
–
VFB
VDAC + 3%
VDAC - 3%
+
–
+
–
VFB
VDAC - 3%
VDAC - 10%
VDAC + 3%
VDAC + 10%
VFB
11
PWR GND
15
CONTROL
LOGIC
+
–
-107mV
–
+
VDAC
+
–
COMP
13
200kHz
30μA
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相關(guān)代理商/技術(shù)參數(shù) |
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| ML4950 WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| ML4950CS | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ML4950ES | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Adjustable Output, Low Current Single Cell Boost Regulator with Detect |
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