MAX1540 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
RCS1
15mΩ
OUTPUT 1
VOUT(HIGH) = 1.5V
VOUT(LOW) = 1.0V
( ) ^R9
VOUT(LOW) = VREF _{(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
MAX1541
DH1
DH2
BST1
BST2
LX1
DL1
SKIP
CSP1
LX2
DL2
GND
CSP2
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
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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