MAX1540A Datasheet, PDF (34/49 Pages) Maxim Integrated Products – Dual Step-Down Controllers with Saturation Protection, Dynamic Output, and Linear Regulator

Dual Step-Down Controllers with Saturation
Protection, Dynamic Output, and Linear Regulator
+5V BIAS
SUPPLY
C1
1μF
VDD
V+
DL1
L1
1.8μH
DBST
NH1
CBST1
0.1μF
NL1
MAX1541
DH1
DH2
BST1
BST2
LX1
LX2
DL1
DL2
SKIP
GND
CSP1
CSP2
RCS1
15mΩ
OUTPUT 1
VOUT(HIGH) = 1.5V
VOUT(LOW) = 1.0V
( ) ^{VOUT(LOW) = VREF}
R9
(R8 + R9)
VOUT(HIGH) = VREF
(R9 + R10)
[R8 + (R9 + R10)]
COUT1
470μF
CCC1
47pF
CREF
0.22μF
CILIM1
470pF
R2
100kΩ
CILIM2
470pF
R3
49.9kΩ
R4
100kΩ
VOUT(LOW)
R5
49.9kΩ
VOUT(HIGH)
OPEN
(ENABLED, 140μs)
REF
R8
75kΩ
R9
75kΩ
CREFIN
470pF
R10
150kΩ
CSN1
OUT1
FB1
CC1
REF
ILIM1
ILIM2
GATE
FBLANK
REFIN1
OD
CSN2
OUT2
FB2
OVP/UVP
LSAT
TON
LDOON
ON1
ON2
VCC
PGOOD1
PGOOD2
LDOIN
LDOOUT
FBLDO
EP
INPUT (VIN)*
7V TO 20V
CIN
(2) 4.7μF
DBST
NH2
CBST
0.1μF
NL2
DL2
L2
4.3μH
RCS2
15mΩ
COUT2
220μF
OUTPUT 2
VOUT2 = 2.5V
OPEN (ILIM(VAL) x 1.75)
REF (485kHz/355kHz)
ON
R1
20Ω
C2
1μF
R6
100kΩ
OFF
+5V BIAS
SUPPLY
R7
100kΩ
C3
4.7μF
R11
32.4kΩ
R12
20kΩ
POWER-GOOD
R13
10Ω
+5V BIAS
SUPPLY
C4
22μF
LDO OUTPUT
VLDOOUT = 3.3V
POWER GROUND
ANALOG GROUND
*LOWER INPUT VOLTAGES REQUIRE
ADDITIONAL INPUT CAPACITANCE.
Figure 12. MAX1541 Standard Application Circuit
SEE TABLE 1 FOR COMPONENT SPECIFICATIONS.
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