Rainbow Electronics MAX1541 - Manual (Page 21)

MAX1540/MAX1541
Dual Step-Down Controllers with Saturation
Protection, Dynamic Output, and Linear Regulator
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Figure 1. MAX1540 Standard Application Circuit
MAX1540
+5V BIAS
SUPPLY
OUTPUT 1
1.8V, 4A (MAX)
REF
(485kHz/355kHz)
POWER GROUND
ANALOG GROUND
POWER-GOOD
ON
OFF
OPEN (I LIM(VAL) x 1.75)
OUTPUT 2
2.5V, 8A (MAX)
INPUT (V IN )*
7V TO 20V
LDOOUT
DH1
BST1
LX1
CSP1
DL1
CSN1
OUT1
FB1
SKIP
TON
REF
ILIM1
ILIM2
PGOOD2
PGOOD1
V CC
ON2
ON1
LDOON
LSAT
OVP/UVP
FB2
OUT2
CSN2
CSP2
GND
DL2
LX2
BST2
DH2
V+
R7
100k
Ω R6
100k Ω
C2
1
µF
R1
20 Ω
C OUT2
330 µF
R CS2
5m Ω
L2
2.2
µH
D L2 D L1
R CS1
15m Ω
C OUT1
220 µF
L1
2.5 µH
N L1 N L2
N H1 N H2
C BST2
0.1 µF
C BST1
0.1 µF
D BST D BST
C1
22 µF
C REF
0.22 µF
C3
470pF
C4
470pF
R2
100k
Ω
R3
49.9k
Ω
R4
200k Ω
R5
49.9k Ω
SEE TABLE 1 FOR COMPONENT SPECIFICATIONS.
*LOWER INPUT VOLTAGES REQUIRE
ADDITIONAL INPUT CAPACITANCE.
+5V BIAS
SUPPLY
C IN
(2) 10 µF