LTC1421(Rev_A) View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LTC1421 Datasheet PDF : 24 Pages
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LTC1421/LTC1421-2.5
BLOCK DIAGRAM
24 AUXVCC
23
VCC
VCCLO
50mV +–
22
SETLO
19
VCCHI
18
SETHI
50mV +–
AUXVCC
CP1
CP2
21
10
17
16
GATELO RAMP GATEHI VOUTHI
CHARGE
PUMP
N2
N1
CP3
20
VOUTLO
VCC
9 CPON
VCC
4 FAULT
20µA
1 CON1
2 CON2
3 POR
5 DISABLE
12
GND
UNDERVOLTAGE
LOCKOUT
DIGITAL CONTROL
UW
W
SWITCHI G TI E WAVEFOR S
t1
t2
CON1
t5
t7
CON2
CPON
PWRGD
RESET
DISABLE
POR
t3
t4
t6
1421 F01
Figure 1. Nominal Operation Switching Waveforms
CP4
1.232V
REFERENCE
+– VTRIP
73.5k
71.5k FB 11
26.7k
REF 8
VCC
20µA
VCC
PWRGD 6
RESET
TIMING
20µA
RESET 7
CP5
+
–
COMPOUT 15
COMP – 14
COMP + 13
1421 BD
t9
t5
VCCLO – SETLO
FAULT
CPON
PWRGD
RESET
POR
t10
t11
t2
1421 F02
t6
Figure 2. Fault Detection Switching
7
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