LTC3577_15 Datasheet, PDF (23/54 Pages) Linear Technology – Highly Integrated 6-Channel Portable PMIC

LTC3577/LTC3577-1
OPERATION
HV_IN
8V TO 38V
(TRANSIENTS
TO 60V)
4.7μF
4
2
V_IN BOOST
68nF _150k
LT3480
5
3
RUN/SS SW
10
R_T
40.2k
7 _NC
6 _NC
1
BD ₈
FB
GND V_C
LT3480
HIGH VOLTAGE
BUCK CIRCUITRY
11 9
0.47μF
6.8μH
DFLS240L
499k
22μF
100k
Si2333DS
UP TO
2A
42 4 41
V_C WALL ACPR
V_OUT
39
LTC3577 IDGATE ³⁷
BAT ³⁸
V_OUT
C_OUT
Si2333DS
(OPT)
+
BAT
Li-Ion
3577 F03
Figure 3. LT3480 Buck Control Using V_C (800kHz Switching)
HV_IN
8V TO 36V
1N4148
3
1
V_IN BOOST
1μF
68nF
150k
4
LT3505
SHDN SW
2
0.1μF _6.8μH
BZT52C16T
MBRM140
20k ^806k
LT3505
HIGH VOLTAGE
BUCK CIRCUITRY
6 R_T
GND
7
FB
V_C
5, 9 8
42 4 41
V_C WALL ACPR
V_OUT
39
LTC3577 IDGATE ³⁷
BAT ³⁸
49.9k
10μF
10.0k
Si2333DS
UP TO
1.2A
V_OUT
C_OUT
Si2333DS
(OPT)
+
BAT
Li-Ion
3577 F04
Figure 4. LT3505 Buck Control Using V_C (2.2MHz Switching with Frequency Foldback)
3577fa
23