LTC3527-1_15 Datasheet, PDF (9/22 Pages) Linear Technology – Dual 800mA/400mA, 1.2MHz/2.2MHz Synchronous Step-Up DC/DC Converters

BLOCK DIAGRAM
V_IN
0.88V
TO 5V
SW1
6
L1
4.7μH
4 ^VIN1
OSC1
C_IN
4.7μF
START1
SD1
SHDN1 ^VREF_GD
1 _SHUTDOWN
AND V_BIAS
ANTI-RING
PWM
LOGIC
AND
DRIVERS
SD1
LTC3527/LTC3527-1
BULK CONTROL SIGNALS
V_IN
V_OUT
V_OUT1
5
0.40Ω
0.30Ω
CURRENT
SENSE
–
I_ZERO
COMP
V_OUT1
1.6V TO 5.25V
PWM
COMP
I_LIM
REF
SLOPE COMPENSATION
MODE
CONTROL
MODE
WAKE1
V_C1
FB1
2
1.20V
ERROR
AMPLIFIER
PGOOD1
16
SLP1
FB1
BURST 1
SD1
TSD
1.20V - 9%
CONVERTER 1
SOFT-START
V_C CLAMP
15 V_IN
10 ^FSEL
3 MODE
V_{REF_GD}
OSCILLATOR
START-UP
OSCILLATOR
OSC1
SLP1
OSC2
SLP2
REFERENCE
UVLO
THERMAL SD
START1
START2
SHARED
V_{REF_GD}
1.20V
1.20V
-
9%
GND
14
TSD _EXPOSED
PAD/ ₁₇
PGND
SW2
7
L2
4.7μH
V_IN2
9
OSC2
START2
SD2
SHDN2 ^VREF_GD
12 _SHUTDOWN
AND V_BIAS
ANTI-RING
PWM
LOGIC
AND
DRIVERS
SD2
BULK CONTROL SIGNALS
V_IN
V_OUT
V_OUT2
8
0.60Ω
0.50Ω
CURRENT
SENSE
–
I_ZERO
COMP
R1
C_OUT1
4.7μF
R2
V_OUT2
1.6V TO 5.25V
PWM
COMP
I_LIM
REF
SLOPE COMPENSATION
MODE
CONTROL
MODE
WAKE2
V_C2
R3
FB2
11
1.20V
R4
ERROR
AMPLIFIER
PGOOD2
13
SLP2
FB2
BURST2
SD2
TSD
1.20V - 9%
CONVERTER 2
SOFT-START
V_C CLAMP
C_OUT2
4.7μF
35271fc
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