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ML4902CT Datasheet(PDF) 6 Page - Micro Linear Corporation

Part # ML4902CT
Description  High Current Synchronous Buck Controller
PDF  12 Pages
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Manufacturer  MICRO-LINEAR [Micro Linear Corporation]
Direct Link  http://www.microlinear.com
Logo MICRO-LINEAR - Micro Linear Corporation

ML4902CT Datasheet(HTML) 6 Page - Micro Linear Corporation

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ML4902
6
Figure 1. Typical VRM Circuit
FUNCTIONAL DESCRIPTION (Continued)
UNDERVOLTAGE LOCKOUT
The ML4902 has hysteretic undervoltage lockout
protection circuits for both the 12V (VDD) and 5V (VCC)
supplies. During an input undervoltage condition, the
internal reference and voltage monitor circuits remain in
operation, but N DRV H and N DRV L are disabled and
the PWR GOOD output will be false (low).
COMPENSATION
The COMP pin is connected to the output of the
transconductance amplifier which forms the gain block
for the proportional control loop of the ML4902. An RC
network from this pin to GND is used to compensate the
amplifier.
VID4
R5
100
Ω
12VIN
5VIN
C4-C9
L2
1.4µH
R4
470k
Ω
C13
1nF
C14
220nF
16V
C20
22µF
25V
C10
220nF
16V
C12
220nF
16V
R3
1M
Ω
OUTEN
VID0
VID1
VID2
VID3
PWRGD
C3
C1
C2
Q1, Q2
2X IRF7413
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
R2
1k
Ω
C11
220nF
16V
Q3, Q4
2X IRF7413
VCCP
VSS
C1 - C9 - 1500µF, 6.3V, Sanyo 6MV1500GX
C15, C19 - 100nF ceramic
U1
ML4902
C15
C19
R1
12
Ω
C22
1nF
PROTECT
VDD
VCC
N DRV H
N DRV L
PWR GND
NC
COMP
ISENSE
VFB
D0
D1
D2
D3
RANGE
SHDN
NC
PWR GOOD
VREF
GND
L1
1µH



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