May 1998
ML4902
High Current Synchronous Buck Controller
GENERAL DESCRIPTION
The ML4902 high current synchronous buck controller
provides high efficiency DC/DC conversion to generate
V
CCP
for processors such as the Pentium
庐
Pro and Pentium
II from Intel
庐
.
The ML4902 controller, when combined with 2 N-channel
MOSFETs, generates output voltages between 1.8V and
3.5V from a 5V 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 90%.
The ML4902 can be enabled/disabled via the
SHDN
pin.
While disabled, the output of the regulator is completely
isolated from the circuit鈥檚 input supply. The ML4902
employs fixed-frequency PWM control combined with a
sophisticated control loop enhancement circuit to provide
excellent load transient response.
FEATURES
s
Designed to meet Pentium Pro and Pentium II VRM
power supply requirements
DC regulation to +1% maximum
Proprietary circuitry provides transient response of 卤5%
maximum over a 0A to 20A load range
Programmable output voltage (1.8V to 3.5V) is set by
an onboard 2 chord 4-bit DAC
Synchronous N-channel buck topology for maximum
power conversion efficiency
Fixed frequency operation for easier system integration
Integrated anti-shootthrough logic, short circuit
protection, shutdown, and UV lockout
s
s
s
s
s
s
BLOCK DIAGRAM
19
VDD
+
10.5V
18
VCC
4.4V
5V
30碌A
PROTECT
20
SHDN
6
D0
1
D1
2
D2
3
D3
4
RANGE
5
鈥?/div>
UVLO
+
鈥?/div>
N DRV H
17
CONTROL
LOGIC
N DRV L
16
PWR GND
15
COMP
3.5V
+
鈥?/div>
+
鈥?/div>
200kHz
+
鈥?/div>
13
VFB
VDAC
鈥?7mV I
SENSE
PWR GOOD
8
11
+
鈥?/div>
12
2 CHORD
4 BIT DAC
VDAC + 3%
VFB
VDAC - 3%
VDAC
+
鈥?/div>
VDAC + 10%
VDAC + 3%
VFB
VDAC - 10%
VDAC - 3%
10
+
鈥?/div>
+
鈥?/div>
+
鈥?/div>
3.5V
REFERENCE
GND
VREF
9
1
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