ML4901 Ver la hoja de datos (PDF) - Micro Linear Corporation
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ML4901 Datasheet PDF : 8 Pages
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April 1997
PRELIMINARY
ML4901
High Current Synchronous Buck Controller
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.
FEATURES
s Designed to meet Pentium® Pro power supply
requirements
s DC regulation to +1% maximum
s Proprietary circuitry provides transient response of +5%
maximum over 300mA to 14A load range
s Programmable output voltage (2.1V to 3.5V) is set by an
onboard 4-bit DAC
s Synchronous buck topology for maximum power
conversion efficiency
s Fixed frequency operation for easier system integration
s Integrated antishoot-through logic, short circuit
protection, and UV lockout
s Shutdown control provides load isolation
BLOCK DIAGRAM (Pin Configuration Shown for 16-Pin SOIC Version)
VDD
15
+
10.4V –
PROTECT
16
+
4.4V –
UVLO
35µA
SHDN
5
D0
1
D1
2
D2
3
D3
4
4 BIT DAC
VDAC
VDAC + 3%
+
–
VFB
+
VDAC - 3%
–
CONTROL
LOGIC
+
–
200kHz
VDAC + 10%
+
VDAC + 3%
–
VFB
+
VDAC - 10%
–
VDAC - 3%
P DRV
14
N DRV
13
PWR GND
12
COMP
11
VFB
9
VDAC
-95mV ISENSE
10
PWR GOOD
6
3.5V
REFERENCE
VREF
7
GND
8
1
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