LTC1643L/LTC1643L-1/LTC1643H
ABSOLUTE
MAXIMUM
RATINGS
(Note 1)
PACKAGE/ORDER INFORMATION
TOP VIEW
12V
IN
1
V
EEIN
2
3V
OUT
3
TIMER 4
ON/ON* 5
FAULT 6
PWRGD 7
GND 8
16 12V
OUT
15 V
EEOUT
14 5V
OUT
13 5V
IN
12 5V
SENSE
11 GATE
10 3V
SENSE
9
3V
IN
Supply Voltages
12V
IN
................................................................ 13.2V
V
EEIN
.............................................................. –13.2V
Input Voltage (Pin 5) ................ – 0.3V to (12V
IN
+ 0.3V)
Output Voltages (Pins 6, 7) ...... – 0.3V to (12V
IN
+ 0.3V)
Analog Voltages
(Pins 3, 4, 9, 10 to 14) ........ – 0.3V to (12V
IN
+ 0.3V)
V
EEOUT
............................................ –13.2V to + 0.3V
12V
OUT
.............................................. – 0.3V to 13.2V
Operating Temperature Range
Commercial ............................................. 0°C to 70°C
Industrial ........................................... – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ORDER PART
NUMBER
LTC1643HCGN
LTC1643LCGN
LTC1643L-1CGN
LTC1643HIGN
LTC1643LIGN
GN PACKAGE
16-LEAD NARROW PLASTIC SSOP
* ON FOR LTC1643H, ON FOR LTC1643L
T
JMAX
= 150°C,
θ
JA
= 135°C/ W
Consult factory for Military grade parts.
DC ELECTRICAL CHARACTERISTICS
The
q
denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C.
V
12VIN
= 12V, V
EE
= – 12V, V
3VIN
= 3.3V, V
5VIN
= 5V. (Note 2)
SYMBOL
I
DD
V
LKO
PARAMETER
V
12VIN
Supply Current
Undervoltage Lockout
CONDITIONS
ON = 3V, ON = GND
12V
IN
3V
IN
5V
IN
V
FB
= (V
5VIN
– V
5VSENSE
), V
5VOUT
= 0V
V
FB
= (V
5VIN
– V
5VSENSE
), V
5VOUT
> 4V
V
FB
= (V
3VIN
– V
3VSENSE
), V
3VOUT
= 0V
V
FB
= (V
3VIN
– V
3VSENSE
), V
3VOUT
> 2V
Charge Pump On, V
GATE
= GND, FAULT = High
Charge Pump Off, V
GATE
= 5V, FAULT = High
Charge Pump Off, V
GATE
= 2V, FAULT = Low
(V
12VIN
– V
GATE
)
(V
12VIN
– V
12VOUT
), I
12VOUT
= 500mA C Grade
I Grade
(V
EEOUT
– V
EEIN
), I
VEEIN
= 100mA
I
CL
Current Foldback
12V
IN
= 12V, 12V
OUT
= 0V
12V
IN
, 12V
OUT
= 12V
V
EEIN
= –12V, V
EEOUT
= 0V
V
EEIN
, V
EEOUT
= – 12V
V
12VOUT
LTC1643H/LTC1643L Only
V
EEOUT
LTC1643H/LTC1643L Only
C Grade
I Grade
C Grade
I Grade
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
MIN
7
2.25
2.25
4
40
4
40
– 20
3
TYP
3.5
9.5
2.5
2.5
7.5
53
7.5
53
14.6
– 50
200
10
100
250
250
120
MAX
8
10.8
2.75
2.75
12
65
12
65
– 100
20
200
600
750
250
500
1500
215
800
11.4
11.4
– 10.8
– 10.8
UNITS
mA
V
V
V
mV
mV
mV
mV
µs
µA
µA
mA
mV
mV
mV
mV
mA
mA
mA
mA
°C
V
V
V
V
V
FB
Foldback Current Limit Voltage
t
CB
I
CP
Circuit Breaker Trip Filter Time
GATE Pin Output Current
q
q
∆V
GATE
V
DROP
External Gate Voltage
Internal Switch Voltage Drop
50
525
100
225
10.8
10.4
– 10.2
– 10.0
250
850
160
450
150
11.1
11.1
– 10.5
– 10.5
T
TS
V
TH
Thermal Shutdown Temperature
Power-Good Threshold Voltage
q
q
q
q
2
U
W
U
U
W W
W
LINER [ LINEAR TECHNOLOGY ]
