Rainbow Electronics MAX1855 - Manual (Page 32)

MAX1716/MAX1854/MAX1855
High-Speed, Adjustable, Synchronous Step-Down
Controllers with Integrated Voltage Positioning
32 ______________________________________________________________________________________
V
CC
C OUT
(8) 47 µF
D2
L1
0.47 µH
1.6V OUTPUT
UP TO 18A
SHDN
VGATE
D1
C4
1 µF
C3
0.1
µF
Q1
Q2
C5
1 µF
R3
10 Ω
C
IN
(5) 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
200k Ω
C2
47pF
C1
0.22 µF
ON OFF
R2
1k
Ω
GND (550kHz)
R1
1k
Ω
R
SENSE
3m Ω
Q1: (2) IRF7811
INTERNATIONAL RECTIFIER
Q2: (2) IRF7811
INTERNATIONAL RECTIFIER
D1: CMPSH-3
CENTRAL SEMICONDUCTOR
D2: CMSH2-60
CENTRAL SEMICONDUCTOR
MAX1716 DAC CODE SHOWN
Figure 13. All-Ceramic-Capacitor Application (Circuit #4)
24
23
22
21
20
19
18
17
1
2
3
4
5
6
7
8
CS
LX
BST
SKIP FB
SHDN
V+
DH
TOP VIEW
D0
D1
D2
D3 TON
V CC
ILIM
CC
16
15
14
13
9
10
11
12
D4
V DD
PGND
DL VGATE
VPS
GND
REF
QSOP
MAX1716
MAX1854
MAX1855
Pin Configuration