LTC3421_15 Datasheet, PDF (7/16 Pages) Linear Technology – 3A, 3MHz Micropower Synchronous Boost Converter with Output Disconnect

BLOCK DIAGRA
+
1V TO 4.5V
LTC3421
21
V_IN
V_OUT
SHDN
2
ENB
4
SHUTDOWN
V_REF
3
1.22V REF
2%
THERMAL
REG/SHDN
R_T
5
OSC
SYNC
IN
SYNC
7
ANTIRING
V_IN V_DD
14 15 16
SW SW SW
PMOS
V_IN
WELL
SWITCH
18
V_OUTS
ANTICROSS
CONDUCTION
NMOS
I_SENSE
AMP
–+
I_ZERO
AMP
V_OUT
17
V_OUT
19
V_OUT
20
CURRENT
LIMIT
CURRENT
COMP
I_LIMIT =
150k/R_C1
ERROR
AMP
1.22V
I_LIM
8
SS
6
FB
1
PWM
LOGIC
SLEEP
OFF
+ _Σ+
Burst Mode ^1%
CONTROL
UV
SLOPE COMP
I/3000
V_C
24
BURST
9
BURST
COMP
–3%
0.97V/1.05V
V_OUT
2.40V TO 5.25V
R1
R_C1
C_SS
R2
C_P
R_Z
OV
R1
LBI
23
V_IN
–
V_OUT
R2
0.6V/
+
0.63V
ENB
3%
EXPOSED
GND
PAD
PGND PGND PGND
10
25
11 12 13
LBO
22
3421 BD
3421f
7