2
LTC1422
1422fb
Consult LTC Marketing for parts specified with wider operating temperature ranges.
WU
U
PACKAGE
/
O
RDER I FOR ATIO
ORDER PART
NUMBER
T
JMAX
= 150°C, θ
JA
= 130°C/W (N)
T
JMAX
= 150°C, θ
JA
= 150°C/W (S)
1
2
3
4
8
7
6
5
TOP VIEW
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
RESET
ON
TIMER
GND
V
CC
SENSE
GATE
FB
Supply Voltage (V
CC
) ........................................... 13.2V
Input Voltage (TIMER, SENSE) ... –0.3V to (V
CC
+ 0.3V)
Input Voltage (FB, ON)........................... –0.3V to 13.2V
Output Voltage (RESET) ........................... –0.3V to 20V
Output Voltage (GATE) ............................. –0.3V to 20V
Operating Temperature Range
LTC1422C ............................................... 0°C to 70°C
LTC1422I........................................... –40°C to 85°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
ABSOLUTE MAXIMUM RATINGS
W
WW
U
LTC1422CN8
LTC1422CS8
LTC1422IN8
LTC1422IS8
S8 PART MARKING
ELECTRICAL CHARACTERISTICS
1422
1422I
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
DC Characteristics
I
CC
V
CC
Supply Current ON = V
CC
● 0.65 1.00 mA
V
LKO
V
CC
Undervoltage Lockout ● 2.40 2.47 2.55 V
V
LKH
V
CC
Undervoltage Lockout Hysteresis 120 mV
V
FB
FB Pin Voltage Threshold ● 1.220 1.232 1.244 V
∆V
FB
FB Pin Threshold Line Regulation 3V ≤ V
CC
≤ 12V ● 0.5 2.5 mV
V
FBHST
FB Pin Voltage Threshold Hysteresis 2.0 mV
V
TM
TIMER Pin Voltage Threshold ● 1.208 1.232 1.256 V
∆V
TM
TIMER Pin Threshold Line Regulation 3V ≤ V
CC
≤ 12V ● 215 mV
V
TMHST
TIMER Pin Voltage Threshold Hystersis 45 mV
I
TM
TIMER Pin Current Timer On, GND ≤ V
TIMER
≤ 1.5V ● –2.5 –2.0 –1.5 µA
Timer Off, V
TIMER
= 1.5V 10 mA
V
CB
Circuit Breaker Trip Voltage V
CB
= (V
CC
– V
SENSE
) ● 44 50 64 mV
I
CP
GATE Pin Output Current Charge Pump On, V
GATE
= GND ● –12 –10 –8 µA
Charge Pump Off, V
GATE
= V
CC
10 mA
∆V
GATE
External N-Channel Gate Drive V
GATE
– V
CC
● 10 12 14 V
V
ONHI
ON Pin Threshold High ● 1.25 1.30 1.35 V
V
ONLO
ON Pin Threshold Low ● 1.20 1.23 1.26 V
V
ONHYST
ON Pin Hysteresis 80 mV
V
OL
Output Low Voltage RESET, I
O
= 3mA ● 0.14 0.4 V
I
PU
Logic Output Pull-Up Current RESET = GND –12 µA
t
RST
Soft Reset Time ● 22 30 48 µs
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V unless otherwise noted.
(Note 1)
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
