Datasheet
LTC4278
2
4278fc
PIN CONFIGURATIONABSOLUTE MAXIMUM RATINGS
Pins with Respect to V
PORTN
V
PORTP
Voltage .........................................–0.3V to 100V
V
NEG
Voltage ......................................... –0.3V to V
PORTP
V
NEG
Pull-Up Current ..................................................1A
SHDN
....................................................... –0.3V to 100V
R
CLASS
, Voltage ............................................–0.3V to 7V
R
CLASS
Source Current ...........................................50mA
PWRGD Voltage (Note 3)
Low Impedance Source ......V
NEG
–0.3V to V
NEG
+11V
Sink Current ......................................................... 5mA
PWRGD, T2P Voltage
............................... –0.3V to 100V
PWRGD, T2P Sink Current
.....................................10mA
Pins with Respect to GND
V
CC
Voltage ................................................ –0.3V to 22V
SENSE
–
, SENSE
+
Voltage ........................–0.5V to +0.5V
UVLO, SYNC Voltage
...................................–0.3V to V
CC
FB Current ..............................................................±2mA
V
CMP
Current .........................................................±1mA
Operating Ambient Temperature Range
LTC4278C ................................................ 0°C to 70°C
LTC4278I..............................................–40°C to 85°C
(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
NC
V
NEG
V
NEG
NC
PG
PGDLY
R
CMP
C
CMP
SENSE
+
SENSE
–
UVLO
V
CMP
SHDN
T2P
R
CLASS
NC
V
PORTN
V
PORTN
NC
NC
SG
V
CC
t
ON
ENDLY
SYNC
SFST
OSC
FB
TOP VIEW
DKD32 PACKAGE
32-LEAD (7mm × 4mm) PLASTIC DFN
T
JMAX
= 125°C, θ
JA
= 34°C/W, θ
JC
= 2°C/W
GND, EXPOSED PAD (PIN 33) MUST BE SOLDERED TO A
HEAT SINKING PLANE THAT IS CONNECTED TO V
NEG
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4278CDKD#PBF LTC4278CDKD#TRPBF 4278
32-Lead (7mm × 4mm) Plastic DFN
0°C to 70°C
LTC4278IDKD#PBF LTC4278IDKD#TRPBF 4278
32-Lead (7mm × 4mm) Plastic DFN
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
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/