Datasheet

LTC3838
3
3838fa
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3838EUHF#PBF LTC3838EUHF#TRPBF 3838
38-Lead (5mm × 7mm) Plastic QFN
–40°C to 125°C
LTC3838IUHF#PBF LTC3838IUHF#TRPBF 3838
38-Lead (5mm × 7mm) Plastic QFN
–40°C to 125°C
LTC3838EFE#PBF LTC3838EFE#TRPBF LTC3838FE 38-Lead Plastic TSSOP –40°C to 125°C
LTC3838IFE#PBF LTC3838IFE#TRPBF LTC3838FE 38-Lead Plastic TSSOP –40°C to 125°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/
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 15V unless otherwise noted (Note 3).
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Main Control Loops
V
IN
Input Voltage Operating Range 4.5 38 V
V
OUT1,2(REG)
Regulated Output Voltage Operating Range V
OUT1
Regulated Differentially with Respect to
V
OUTSENSE1
–
, V
OUT2
Regulated with Respect to
SGND
0.6 5.5 V
I
Q
Input DC Supply Current
Both Channels Enabled
Only One Channel Enabled
Shutdown Supply Current
MODE/PLLIN = 0V, No Load
RUN1 or RUN2 (But Not Both) = 0V
RUN1 = RUN2 = 0V
3
2
15
mA
mA
µA
V
OUTSENSE1(REG)
Regulated Differential Feedback Voltage on
Channel 1 (V
OUTSENSE1
+
– V
OUTSENSE1
–
)
ITH1 = 1.2V (Note 5)
T
A
= 25°C
T
A
= 0°C to 85°C
T
A
= –40°C to 125°C
l
l
0.5985
0.596
0.594
0.6
0.6
0.6
0.6015
0.604
0.606
V
V
V
Regulated Differential Feedback Voltage on
Channel 1 Over Line, Load and Common
Mode
V
IN
= 4.5V to 38V, ITH1 = 0.5V to 1.9V (Note 5),
–0.5V < V
OUTSENSE1
–
< 0.5V
T
A
= 0°C to 85°C
T
A
= –40°C to 125°C
l
l
0.594
0.591
0.6
0.6
0.606
0.609
V
V
V
FB2(REG)
Regulated Feedback Voltage on Channel 2 ITH2 = 1.2V (Note 5)
T
A
= 25°C
T
A
= 0°C to 85°C
T
A
= –40°C to 125°C
l
l
0.597
0.594
0.592
0.6
0.6
0.6
0.603
0.606
0.608
V
V
V
Regulated Feedback Voltage on Channel 2
Over Line, Load
V
IN
= 4.5V to 38V, ITH2 = 0.5V to 1.9V (Note 5)
T
A
= 0°C to 85°C
T
A
= –40°C to 125°C
l
l
0.592
0.588
0.6
0.6
0.608
0.612
V
V
I
VOUTSENSE1
+
V
OUTSENSE1
+
Input Bias Current V
OUTSENSE1
+
– V
OUTSENSE1
–
= 0.6V ±5 ±25 nA
I
VOUTSENSE1
–
V
OUTSENSE1
–
Input Bias Current V
OUTSENSE1
+
– V
OUTSENSE1
–
= 0.6V –25 –50 µA
I
VFB2
V
FB2
Input Bias Current V
FB2
= 0.6V –5 ±50 nA
g
m(EA)1,2
Error Amplifier Transconductance ITH = 1.2V (Note 5) 1.7 mS
t
ON(MIN)1,2
Minimum Top Gate On-Time V
IN
= 38V, V
OUT
= 0.6V, R
T
= 20k (Note 6) 30 ns
t
OFF(MIN)1,2
Minimum Top Gate Off-Time (Note 6) 90 ns