Rainbow Electronics MAX1855 - Manual (Page 31)

MAX1716/MAX1854/MAX1855
High-Speed, Adjustable, Synchronous Step-Down
Controllers with Integrated Voltage Positioning
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V
CC
C OUT
(4) 220 µF
D2
L1
0.68 µH
1.0V OUTPUT
UP TO 12A
SHDN
VGATE
D1
C4
1 µF
C3
0.1
µF
Q1
Q2
C5
1 µF
R3
10 Ω
C
IN
(4) 10 µF
BATTERY (V BATT )
7V TO 24V
REF
ILIM
CC
+5V INPUT
BIAS SUPPLY
POWER-GOOD
INDICATOR
DL
LX
V+
DH
BST
CS
PGND
VPS
FB
TON
V DD
MAX1716
MAX1854
MAX1855
SKIP
D0
D1
D2
D3
D4
GND
R6
100k Ω
TO V CC
R4
100k Ω
R5
300k Ω
C2
47pF
C1
0.22 µF
ON OFF
R2
2k
Ω
REF (400kHz)
R1
1k
Ω
R
SENSE
3.5m Ω
Q1: IRF7811
INTERNATIONAL RECTIFIER
Q2: (2) IRF7811
INTERNATIONAL RECTIFIER
D1: CMPSH-3
CENTRAL SEMICONDUCTOR
D2: CMSH2-60
CENTRAL SEMICONDUCTOR
MAX1716 DAC CODE SHOWN
Figure 12. Low-Voltage Application (Circuit #3)