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LTC4268-1
2
42681fc
pin conFiguraTion
absoluTe MaxiMuM raTings
V
PORTN
 Voltage .......................................... 0.3V to 90V
V
NEG
 Voltage ..................V
PORTN
 + 90V to V
PORTN
 0.3V
V
CC
 to GND Voltage (Note 3)
   Low Impedance Source ......................... 0.3V to 18V
   Current Fed ..........................................30mA into V
CC
R
CLASS
, I
LIM_EN
 Voltage ..V
PORTN
 + 7V to V
PORTN
  0.3V
SHDN Voltage ...............V
PORTN
 + 90V to V
PORTN
  0.3V
PWRGD Voltage (Note 3)
   Low Impedance Source ....V
NEG
 + 11V to V
NEG
  0.3V
   Current Fed ..........................................................5mA
PWRGD Voltage ............V
PORTN
 + 80V to V
PORTN
  0.3V
PWRGD Current .....................................................10mA
R
CLASS
 Current ....................................................100mA
SENSE

, SENSE
+
 Voltage ........................0.5V to +0.5V
UVLO, SYNC Voltage ...................................0.3V to V
CC
FB Current ..............................................................?mA
V
CMP
 Current .........................................................?mA
Operating Ambient Temperature Range (Notes 4, 5)
   LTC4268-1C .............................................0癈 to 70癈
   LTC4268-1I ..........................................40癈 to 85癈
Junction Temperature (Note 5) ............................. 150癈
Storage Temperature Range ..................65癈 to 150癈
(Notes 1, 2)
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
33
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
V
PORTP
NC
PWRGD
PWRGD
V
NEG
V
NEG
V
NEG
NC
PG
PGDLY
R
CMP
C
CMP
SENSE+
SENSE
UVLO
V
CMP
SHDN
NC
R
CLASS
I
LIM_EN
 V
PORTN
V
PORTN
V
PORTN
NC
SG
V
CC
t
ON
ENDLY
SYNC
SFST
OSC
FB
TOP VIEW
DKD32 PACKAGE
32-LEAD (7mm ?4mm) PLASTIC DFN
 
T
JMAX
 = 150癈,?/DIV>
JA
 = 49癈/W, ?/DIV>
JC
 = 4.7癈/W
EXPOSED PAD (PIN 33) MUST BE SOLDERED TO
HEAT SINKING PLANE THAT IS ELECTRICALLY CONNECTED TO GND
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC4268CDKD-1#PBF
LTC4268IDKD-1#PBF
LTC4268CDKD-1#TRPBF
LTC4268IDKD-1#TRPBF
42681
42681
32-Lead (7mm ?4mm) Plastic DFN
32-Lead (7mm ?4mm) Plastic DFN
0癈 to 70癈
40癈 to 85癈
LEAD BASED FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC4268CDKD-1
LTC4268IDKD-1
LTC4268CDKD-1#TR
LTC4268IDKD-1#TR
42681
42681
32-Lead (7mm ?4mm) Plastic DFN
32-Lead (7mm ?4mm) Plastic DFN
0癈 to 70癈
40癈 to 85癈
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
orDer inForMaTion
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