LTC1644
2
1644f
Supply Voltages
12V
IN
................................................................ 13.2V
V
EEIN
.................................................................. –14V
Input Voltages (Pins 5, 9) .......................–0.3V to 13.5V
Output Voltages (Pins 6, 7, 10) ..............–0.3V to 13.5V
Analog Voltages and Currents
Pins 3, 11 to 14, 16 to 18 ...................–0.3V to 13.5V
Pins 4, 15 ............................. –0.3V to (12V
IN
+ 0.3V)
V
EEOUT
...................................................–14V to 0.3V
12V
OUT
...............................................–0.3V to 13.2V
Operating Temperature Range
LTC1644C ............................................... 0°C to 70°C
LTC1644I............................................ –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
= 140°C, θ
JA
= 135°C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
LTC1644CGN
LTC1644IGN
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
(Note 1)
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
V
12VIN
= 12V, V
EEIN
= –12V, V
3VIN
= 3.3V, V
5VIN
= 5V unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
DD
V
12VIN
Supply Current OFF/ON = 0V ● 38 mA
V
LKO
Undervoltage Lockout 12V
IN
, Ramping Down ● 6.00 8.30 10.80 V
3V
IN
, 5V
IN
, Ramping Down ● 2.25 2.48 2.75 V
V
FB
Foldback Current Limit Voltage V
FB
= (V
5VIN
– V
5VSENSE
), V
5VOUT
= 0V, TIMER = 0V ● 81215 mV
V
FB
= (V
5VIN
– V
5VSENSE
), V
5VOUT
= 3V, TIMER = 0V ● 40 51 70 mV
V
FB
= (V
3VIN
– V
3VSENSE
), V
3VOUT
= 0V, TIMER = 0V ● 81215 mV
V
FB
= (V
3VIN
– V
3VSENSE
), V
3VOUT
= 2V, TIMER = 0V ● 40 51 70 mV
V
CB
Circuit Breaker Trip Voltage V
CB
= (V
5VIN
– V
5VSENSE
), TIMER = FLOAT ● 40 55 70 mV
V
CB
= (V
3VIN
– V
3VSENSE
), TIMER = FLOAT ● 40 55 70 mV
t
OC
Overcurrent Fault Response Time (V
5VIN
– V
5VSENSE
) = 100mV, TIMER = FLOAT ● 30 45 60 µs
(V
3VIN
– V
3VSENSE
) = 100mV, TIMER = FLOAT ● 30 45 60 µs
t
SC
Short-Circuit Response Time (V
5VIN
– V
5VSENSE
) = 200mV, TIMER = FLOAT ● 0.1 1.0 µs
(V
3VIN
– V
3VSENSE
) = 200mV, TIMER = FLOAT ● 0.1 1.0 µs
I
CP
GATE Pin Output Current OFF/ON = 0V, V
GATE
= 0V, TIMER = 0V ● –20 –65 –100 µA
V
GATE
= 5V, OFF/ON = 4V 100 225 300 µA
OFF/ON = 0V, V
GATE
= 2V, TIMER = FLOAT, FAULT = 0V ● 31020 mA
∆V
GATE
External Gate Voltage ∆V
GATE
= (V
12VIN
– V
GATE
), I
GATE
= –1µA ● 50 200 mV
V
DROP
Internal Switch Voltage Drop V
DROP
= (V
12VIN
– V
12VOUT
), I = 500mA ● 200 600 mV
V
DROP
= (V
EEOUT
– V
EEIN
), I
EE
= 100mA ● 110 250 mV
I
CL
Current Foldback 12V
IN
= 12V, 12V
OUT
= 0V, TIMER = 0V ● –50 –360 –600 mA
12V
IN
= 12V, 12V
OUT
= 10V, TIMER = 0V ● –525 –840 –1500 mA
V
EEIN
= –12V, V
EEOUT
= 0V, TIMER = 0V ● 20 100 300 mA
V
EEIN
= –12V, V
EEOUT
= –10V, TIMER = 0V ● 200 320 650 mA
T
TS
Thermal Shutdown Temperature 130 °C
1
2
3
4
5
6
7
8
9
10
TOP VIEW
GN PACKAGE
20-LEAD PLASTIC SSOP
20
19
18
17
16
15
14
13
12
11
12V
IN
V
EEIN
5V
OUT
TIMER
OFF/ON
FAULT
PWRGD
GND
RESETIN
RESETOUT
12V
OUT
V
EEOUT
3V
OUT
3V
IN
3V
SENSE
GATE
5V
SENSE
5V
IN
PRECHARGE
DRIVE
