MAX8778 데이터 시트보기 (PDF) - Maxim Integrated
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MAX8778 Datasheet PDF : 34 Pages
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Dual Quick-PWM Step-Down Controller
with Low-Power LDO, RTC Regulator
NOTE: PLACE C22 BETWEEN
IN AND PGND AS CLOSE AS
POSSIBLE TO THE MAX17020.
L1
5V OUTPUT
COUT1
D1
C22
0.1μF
NH1
CBST1
0.1μF
NL1
12V TO 15V
CHARGE
PUMP
C8
0.1μF
C6
0.1μF
DX1
C5
10nF
C7
10nF
R4
500kΩ
DX2
R5
100kΩ
IN
DH1
DH2
BST1
BST2
LX1
LX2
NH2
CBST2
0.1μF
DL1
OUT1
BYP
DL2
PGND
AGND
OUT2
NL2
RGND
0Ω
MAX17020
R6
100kΩ
PGOOD1
PGOOD2
RTC
C3
1μF
SECFB
C4
0.1μF
REF
FB1
SKIP
CIN
4 x 10μF 25V
INPUT (VIN)*
7V TO 24V
L2
3.3V OUTPUT
COUT2
D2
R7
100kΩ
5V SMPS OUTPUT (OUT1)
} POWER-GOOD
RTC SUPPLY
5V LDO OUTPUT
C1
R1
4.7μF
47Ω
POWER GROUND
ANALOG GROUND
C2
1.0μF
RILIM1
*LOWER INPUT VOLTAGES REQUIRE
ADDITIONAL INPUT CAPACITANCE. IF
OPERATING NEAR DROPOUT, COMPONENT
SELECTION MUST BE CAREFULLY DONE TO
ENSURE PROPER OPERATION.
Figure 1. Standard Application Circuit—Main Supply
LDOREFIN
VDD
LDO
ON1
ON2
ONLDO
VCC
TON
REFIN2
ILIM1
ILIM2
PAD
ON OFF
X
OUT1/OUT2 SWITCHING FREQUENCY
OPEN (REF): 400kHz/300kHz
RILIM2
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