LTC3855 LINER [Linear Technology], LTC3855 Datasheet - Page 3

• Manufacturer Part Number: LTC3855
• Description: Dual, Fast, Accurate Step-Down DC/DC Controller
• Manufacturer: LINER [Linear Technology]

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