LTC1646
2
1646fa
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
DD
V
5VIN
Supply Current OFF/ON = 0V ● 1.5 4 mA
V
LKO
Undervoltage Lockout 5V
IN
● 2.3 2.50 2.7 V
3V
IN
● 2.3 2.55 2.7 V
V
FB
Foldback Current Limit Voltage V
FB
= (V
5VIN
–V
5VSENSE
), V
5VOUT
= 0V, TIMER = 0V ● 15 20 30 mV
V
FB
= (V
5VIN
– V
5VSENSE
), V
5VOUT
= 4V, TIMER = 0V ● 50 55 65 mV
V
FB
= (V
3VIN
– V
3VSENSE
), V
3VOUT
= 0V, TIMER = 0V ● 15 20 30 mV
V
FB
= (V
3VIN
– V
3VSENSE
), V
3VOUT
= 2V, TIMER = 0V ● 50 55 65 mV
V
CB
Circuit Breaker Trip Voltage V
CB
= (V
5VIN
– V
5VSENSE
), V
5VOUT
= 5V, TIMER Open ● 50 56 65 mV
V
CB
= (V
3VIN
– V
3VSENSE
), V
3VOUT
= 3.3V, TIMER Open ● 50 56 65 mV
t
OC
Overcurrent Fault Response Time (V
5VIN
– V
5VSENSE
) = 100mV, TIMER Open ● 10 21 30 µs
(V
3VIN
– V
3VSENSE
) = 100mV, TIMER Open ● 10 21 30 µs
t
SS
Short-Circuit Fault Response Time (V
5VIN
– V
5VSENSE
) = 200mV, TIMER Open ● 0.145 1 µs
(V
3VIN
– V
3VSENSE
) = 200mV, TIMER Open ● 0.145 1 µs
I
CP
GATE Pin Output Current OFF/ON = 0V, V
GATE
= 0V, TIMER = 0V ● –18 –13 –8 µA
OFF/ON = 5V, V
GATE
= 5V, TIMER = 0V 80 200 300 µA
OFF/ON = 0V, V
GATE
= 5V, FAULT = 0V, TIMER Open ● 4712mA
V
GATE
External Gate Voltage OFF/ON = 0V, I
GATE
= –1µA ● 12 15 16 V
(GATE to GND) OFF/ON = 0V, V
5VIN
= 3.3V, I
GATE
= –1µA ● 11 13 15 V
V
TH
Power Good Threshold Voltage 3V
OUT
● 2.8 2.9 3.0 V
5V
OUT
● 4.5 4.65 4.75 V
V
3VONLY
No 5V Input Mode Window Voltage V
3VONLY
= ⎪V
5VIN
– V
3VIN
⎪, V
5VOUT
= V
3VOUT
= 3.3V ● 50 120 200 mV
V
IL
Input Low Voltage OFF/ON, RESETIN, FAULT ● 0.8 V
ORDER PART NUMBER
T
JMAX
= 125°C, θ
JA
= 135°C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
LTC1646CGN
LTC1646IGN
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
5VIN
= 5V and V
3VIN
= 3.3V unless otherwise noted.
Supply Voltages: 5V
IN
, 3V
IN
...............................................
10V
Input Voltages: (Pins 15, 16) ..................... –0.3V to 10V
Output Voltages: (Pins 1, 3, 4) .................. –0.3V to 10V
Analog Voltages and Currents:
(Pin 9) .................................... –0.3V to (3V
IN
+ 0.3V)
(Pins 2, 5, 7, 11, 13, 14) ........ –0.3V to (5V
IN
+ 0.3V)
(Pin 10) .......................................................... ±20mA
Operating Temperature Range:
LTC1646C ............................................... 0°C to 70°C
LTC1646I.............................................–40°C to 85°C
Storage Temperature Range ..................–65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
TOP VIEW
GN PACKAGE
16-LEAD PLASTIC SSOP
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
RESETOUT
TIMER
FAULT
PWRGD
5V
OUT
GND
3V
OUT
3V
IN
RESETIN
OFF/ON
DRIVE
PRECHARGE
5V
IN
5V
SENSE
GATE
3V
SENSE
GN PART MARKING
1646
1646I
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
