Datasheet

2
LTC1421/LTC1421-2.5
ABSOLUTE MAXIMUM RATINGS
W
WW
U
WU
U
PACKAGE
/
O
RDER I FOR ATIO
Consult factory for parts specified with wider operating temperature ranges.
(Note 1)
Supply Voltage (V
CCLO
, V
CCHI
, AUXV
CC
) .............. 13.2V
Input Voltage (Analog Pins)..... – 0.3V to (V
CCHI
+ 0.3V)
Input Voltage (Digital Pins)................... – 0.3V to 13.2V
Output Voltage (Digital Pins) .. – 0.3V to (V
CCLO
+ 0.3V)
Output Voltage (CPON)......... – 13.2V to (V
CCLO
+ 0.3V)
Output Voltage (V
OUTLO
, V
OUTHI
) ........... –0.3V to 13.2V
Output Voltage (GATELO, GATEHI)........... –0.3V to 20V
Operating Temperature Range
LTC1421C ............................................... 0°C to 70°C
LTC1421I........................................... –40°C to 85°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
ORDER PART
NUMBER
T
JMAX
= 125°C, θ
JA
= 100°C/W (G)
T
JMAX
= 125°C, θ
JA
= 85°C/W (SW)
1
2
3
4
5
6
7
8
9
10
11
12
TOP VIEW
SW PACKAGE
24-LEAD PLASTIC SO
G PACKAGE
24-LEAD PLASTIC SSOP
24
23
22
21
20
19
18
17
16
15
14
13
CON1
CON2
POR
FAULT
DISABLE
PWRGD
RESET
REF
CPON
RAMP
FB
GND
AUXV
CC
V
CCLO
SETLO
GATELO
V
OUTLO
V
CCHI
SETHI
GATEHI
V
OUTHI
COMPOUT
COMP
–
COMP
+
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CCHI
= 12V, V
CCLO
= 5V unless otherwise noted (Note 2).
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
DC Characteristics
I
CCLO
V
CCLO
Supply Current CON1 = CON2 = GND, POR = V
CCLO
● 1.5 3 mA
I
CCHI
V
CCHI
Supply Current CON1 = CON2 = GND, POR = V
CCLO
● 0.6 1 mA
V
LKO
Undervoltage Lockout V
CCLO
and V
CCHI
2.28 2.45 2.60 V
V
LKH
Undervoltage Lockout Hysteresis V
CCLO
and V
CCHI
100 mV
V
REF
Reference Output Voltage No Load ● 1.220 1.232 1.244 V
∆V
LNR
Reference Line Regulation 3V ≤ V
CCLO
≤ 12V, No Load ● 48 mV
∆V
LDR
Reference Load Regulation I
O
= 0mA to –5mA, Sourcing Only ● 13 mV
I
RSC
Reference Short-Circuit Current V
REF
= 0V –45 mA
V
COF
Comparator Offset Voltage 0V ≤ V
CM
≤ (V
CCLO
− 1.3V) ● ±10 mV
V
CPSR
Comparator Power Supply Rejection 0V ≤ V
CM
≤ (V
CCLO
− 1.3V), 3V ≤ V
CCLO
≤ 12V ● 1 mV/V
V
CHST
Comparator Hysteresis 0V ≤ V
CM
≤ (V
CCLO
− 1.3V) 7 mV
V
RST
Reset Voltage Threshold (V
OUTLO
) FB = V
OUTLO
● 2.80 2.90 3.00 V
FB = Floating
● 4.50 4.65 4.75 V
FB = GND
● 5.75 5.88 6.01 V
V
RHST
Reset Threshold Hysteresis (V
OUTLO
) FB = V
OUTLO
7mV
FB = Floating 12 mV
FB = GND 15 mV
R
FB
FB Pin Input Resistance 0V ≤ V
FB
≤ V
CCLO
95 kΩ
V
CB
Circuit Breaker Trip Voltage V
CB
= (V
CCLO
– V
SETLO
) or V
CB
= (V
CCHI
– V
SETHI
) ● 40 50 60 mV
V
TRIP
Output Voltage for Re-Power-Up LTC1421 (Note 3) 0.1 V
LTC1421-2.5 (Note 4) 2.5 V
LTC1421CG
LTC1421CSW
LTC1421CG-2.5
LTC1421CSW-2.5
LTC1421IG
LTC1421ISW
LTC1421IG-2.5
LTC1421ISW-2.5