LTC1646
ABSOLUTE
(Note 1)
AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW
RESETOUT 1
TIMER 2
FAULT 3
PWRGD 4
5V
OUT
5
GND 6
3V
OUT
7
3V
IN
8
16 RESETIN
15 OFF/ON
14 DRIVE
13 PRECHARGE
12 5V
IN
11 5V
SENSE
10 GATE
9
3V
SENSE
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
GN PACKAGE
16-LEAD PLASTIC SSOP
T
JMAX
= 125°C,
θ
JA
= 135°C/W
ORDER PART NUMBER
LTC1646CGN
LTC1646IGN
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:
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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.
SYMBOL
I
DD
V
LKO
V
FB
PARAMETER
V
5VIN
Supply Current
Undervoltage Lockout
Foldback Current Limit Voltage
CONDITIONS
OFF/ON = 0V
5V
IN
3V
IN
V
FB
= (V
5VIN
– V
5VSENSE
), V
5VOUT
= 0V, TIMER = 0V
V
FB
= (V
5VIN
– V
5VSENSE
), V
5VOUT
= 4V, TIMER = 0V
V
FB
= (V
3VIN
– V
3VSENSE
), V
3VOUT
= 0V, TIMER = 0V
V
FB
= (V
3VIN
– V
3VSENSE
), V
3VOUT
= 2V, TIMER = 0V
V
CB
= (V
5VIN
– V
5VSENSE
), V
5VOUT
= 5V, TIMER Open
V
CB
= (V
3VIN
– V
3VSENSE
), V
3VOUT
= 3.3V, TIMER Open
(V
5VIN
– V
5VSENSE
) = 100mV, TIMER Open
(V
3VIN
– V
3VSENSE
) = 100mV, TIMER Open
(V
5VIN
– V
5VSENSE
) = 200mV, TIMER Open
(V
3VIN
– V
3VSENSE
) = 200mV, TIMER Open
OFF/ON = 0V, V
GATE
= 0V, TIMER = 0V
OFF/ON = 5V, V
GATE
= 5V, TIMER = 0V
OFF/ON = 0V, V
GATE
= 5V, FAULT = 0V, TIMER Open
OFF/ON = 0V, I
GATE
= –1µA
OFF/ON = 0V, V
5VIN
= 3.3V, I
GATE
= –1µA
3V
OUT
5V
OUT
OFF/ON, RESETIN, FAULT
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
ELECTRICAL CHARACTERISTICS
MIN
2.3
2.3
15
50
15
50
50
50
10
10
TYP
1.5
2.50
2.55
20
55
20
55
56
56
21
21
0.145
0.145
MAX
4
2.7
2.7
30
65
30
65
65
65
30
30
1
1
–8
300
12
16
15
3.0
4.75
200
0.8
UNITS
mA
V
V
mV
mV
mV
mV
mV
mV
µs
µs
µs
µs
µA
µA
mA
V
V
V
V
mV
V
1646fa
V
CB
t
OC
t
SS
I
CP
Circuit Breaker Trip Voltage
Overcurrent Fault Response Time
Short-Circuit Fault Response Time
GATE Pin Output Current
–18
80
4
12
11
2.8
4.5
50
–13
200
7
15
13
2.9
4.65
120
V
GATE
V
TH
V
3VONLY
V
IL
External Gate Voltage
(GATE to GND)
Power Good Threshold Voltage
No 5V Input Mode Window Voltage V
3VONLY
=
⎪V
5VIN
– V
3VIN
⎪,
V
5VOUT
= V
3VOUT
= 3.3V
Input Low Voltage
2
U
W
U
U
W W
W
LINER [ LINEAR TECHNOLOGY ]
