Datasheet

2
LTC1645
1645fa
Supply Voltage (V
CC1
, V
CC2
) ................................. 13.2V
Input Voltage
FB, ON, COMP
+
..................... –0.3V to (V
CC1
+ 0.3V)
TIMER ................................................. –0.3V to 2.5V
SENSE1 ..................... (V
CC1
– 0.7V) to (V
CC1
+ 0.3V)
SENSE2 ...................... (V
CC1
– 0.7V) to (V
CC2
+ 0.3V)
Output Voltage
RESET, COMPOUT, FAULT .....................–0.3V to 16V
GATE1, GATE2................. Internally Limited (Note 3)
Output Current
GATE1, GATE2............................................... ±20mA
Operating Temperature Range
LTC1645C ............................................... 0°C to 70°C
LTC1645I............................................ –40°C to 85°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
DC Characteristics
I
CC1
V
CC1
Supply Current ON = V
CC1
= 5V, V
CC2
= 3.3V ● 1.1 2.0 mA
I
CC2
V
CC2
Supply Current ON = V
CC1
= 5V, V
CC2
= 3.3V ● 0.28 0.4 mA
V
LKO1
V
CC1
Undervoltage Lockout High to Low ● 2.16 2.23 2.3 V
V
LKO2
V
CC2
Undervoltage Lockout High to Low ● 1.06 1.12 1.18 V
V
LKH n
V
CC n
Undervoltage Lockout Hysteresis 25 mV
V
FB
FB Pin Voltage Threshold High to Low ● 1.226 1.238 1.250 V
∆V
FB
FB Pin Threshold Line Regulation High to Low, V
CC1
= 2.375V to 12V ● 14 mV
V
FBHST
FB Pin Voltage Threshold Hysteresis 5 mV
V
COMP
COMP
+
Pin Voltage Threshold High to Low ● 1.226 1.238 1.250 V
∆V
COMP
COMP
+
Pin Threshold Line Regulation High to Low, V
CC1
= 2.375V to 12V ● 14 mV
V
COMPHST
COMP
+
Pin Voltage Threshold Hysteresis 5 mV
(Note 1)
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
2.375V ≤ V
CC1
≤ 12V, 1.2V ≤ V
CC2
≤ 12V unless otherwise noted (Note 2).
TOP VIEW
S PACKAGE
14-LEAD PLASTIC SO
1
2
3
4
5
6
7
14
13
12
11
10
9
8
V
CC2
SENSE2
GATE2
FAULT
RESET
FB
GND
V
CC1
SENSE1
GATE1
TIMER
ON
COMPOUT
COMP
+
T
JMAX
= 125°C, θ
JA
= 110°C/W
TOP VIEW
V
CC1
SENSE1
GATE1
ON
V
CC2
SENSE2
GATE2
GND
S8 PACKAGE
8-LEAD PLASTIC SO
1
2
3
4
8
7
6
5
T
JMAX
= 125°C, θ
JA
= 150°C/W
ORDER PART
NUMBER
S8 PART MARKING
1645
1645I
LTC1645CS8
LTC1645IS8
ORDER PART
NUMBER
LTC1645CS
LTC1645IS
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
ELECTRICAL CHARACTERISTICS
Consult LTC Marketing for parts specified with wider operating temperature ranges.