2
LTC1642
1642fb
Supply Voltage (V
CC
) .................................0.3V to 33V
SENSE Pin ................................... 0.3V to (V
CC
 + 0.3V)
ON, FB, OV, COMP
+
, COMP

RESET, FAULT, COMPOUT .....................0.3V to 18.5V
Operating Temperature Range
LTC1642C ...............................................0癈 to 70癈
LTC1642I............................................ 40癈 to 85癈
Storage Temperature Range ................. 65癈 to 150癈
Lead Temperature (Soldering, 10 sec)..................300癈
The LTC1642A is Recommended for Applications
Where V
CC
 is Higher Than 12V.
ABSOLUTE   AXI  U   RATI  GS
W
W
U
PACKAGE/ORDER I  FOR  ATIO
U
W
(Note 1)
DC ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
CC
Operating Voltage Range
?SPAN class="pst LTC1642CGN-TRPBF_2348276_9">   2.97
16.5
V
I
CC
V
CC
 Supply Current
ON = V
CC
?/DIV>
1.25
3.0
mA
V
LKHI
V
CC
Undervoltage Lockout
V
CC
 Rising
?SPAN class="pst LTC1642CGN-TRPBF_2348276_9">    2.55
2.73
2.95
V
V
LKLO
V
CC
Undervoltage Lockout
V
CC
 Falling
?SPAN class="pst LTC1642CGN-TRPBF_2348276_9">    2.35
2.50
2.95
V
V
LKHYST
V
CC
Undervoltage Lockout Hysteresis
230
mV
V
FB
FB Pin Voltage Threshold
FB Falling
?SPAN class="pst LTC1642CGN-TRPBF_2348276_9">    1.208
1.220
1.232
V
V
FB
FB Pin Threshold Supply Variation
FB Falling,
 
2.97V d V
CC
 d 16.5V
?/DIV>
5
15
mV
V
FBHST
FB Pin Voltage Threshold Hysteresis
3
mV
I
FB(IN)
FB Pin Input Current
V
OV
= 5V
?/DIV>
0
?
V
OV
OV Pin Voltage Threshold
OV Rising
?SPAN class="pst LTC1642CGN-TRPBF_2348276_9">    1.208
1.220
1.232
V
V
OV
OV Pin Threshold Supply Variation
OV Rising,
 
2.97V d V
CC
 d 16.5V
?/DIV>
5
15
mV
V
OVHYST
OV Pin Voltage Threshold Hysteresis
3
mV
I
OV(IN)
OV Pin Input Current
V
FB
= 5V
?/DIV>
0
?
V
RST
RST TMR Pin Voltage Threshold
RST TMR Rising
?SPAN class="pst LTC1642CGN-TRPBF_2348276_9">    1.200
1.220
1.250
V
V
RST
RST TMR Pin Threshold Supply Variation
RST TMR Rising, 2.97V d V
CC
 d 16.5V
?/DIV>
5
15
mV
I
RST
RST TMR Pin Current
Timer On
?SPAN class="pst LTC1642CGN-TRPBF_2348276_9">    1.5
2.0
2.5
Timer Off, V
RSTTMR
= 1.5V
10
mA
V
BRK
BRK TMR Pin Voltage Threshold
BRK TMR Rising
?SPAN class="pst LTC1642CGN-TRPBF_2348276_9">    1.200
1.220
1.250
V
V
BRK
BRK TMR Pin Threshold Supply Variation
BRK TMR Rising, 2.97V d V
CC
 d 16.5V    ?/SPAN>
5
15
mV
I
BRK
BRK TMR Pin Current
Timer On
?/DIV>
15
20
30
Timer Off, V
BRKTMR
 = 1.5V
10
mA
V
CR
CRWBR Pin Voltage Threshold
CRWBR Rising
?/DIV>
375
410
425
mV
V
CR
CRWBR Pin Threshold Supply Variation
2.97V d V
CC
 d 16.5V
?/DIV>
4
15
mV
The ?/SPAN> denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
 = 25?/SPAN>C.
V
CC
 = 5V unless otherwise specified.
ORDER PART NUMBER
Consult LTC Marketing for parts specified with wider operating temperature ranges.
LTC1642CGN
LTC1642IGN
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/
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
CRWBR
BRK TMR
RST TMR
ON
RESET
FAULT
FB
GND
V
CC
SENSE
GATE
REF
COMP

COMP
+
COMPOUT
OV
GN PACKAGE
16-LEAD PLASTIC SSOP
T
JMAX
 = 150癈, ?/DIV>
JA
 = 130癈/W
GN PART MARKING
1642
1642I
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