LTC3835 Linear Technology, LTC3835 Datasheet - Page 3

• Manufacturer Part Number: LTC3835
• Description: Low IQ Synchronous Step-Down Controller
• Manufacturer: Linear Technology

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ELECTRICAL CHARACTERISTICS
ORDER INFORMATION
LEAD FREE FINISH
LTC3835EFE#PBF
LTC3835IFE#PBF
LTC3835EUFD#PBF
LTC3835IUFD#PBF
LEAD BASED FINISH
LTC3835EFE
LTC3835IFE
LTC3835EUFD
LTC3835IUFD
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container.
For more information on lead free part marking, go to:
For more information on tape and reel specifi cations, go to:
temperature range, otherwise specifi cations are at T
SYMBOL
Main Control Loops
V
I
V
V
g
I
UVLO
V
I
DF
I
V
V
TG t
TG t
BG t
BG t
VFB
Q
SENSE
TRACK/SS
m
FB
REFLNREG
LOADREG
OVL
RUN
SENSE(MAX)
MAX
r
f
r
f
ON
PARAMETER
Regulated Feedback Voltage
Feedback Current
Reference Voltage Line Regulation
Output Voltage Load Regulation
Transconductance Amplifi er g
Input DC Supply Current
Undervoltage Lockout
Feedback Overvoltage Lockout
Sense Pins Total Source Current
Maximum Duty Factor
Soft-Start Charge Current
RUN Pin ON Threshold
Maximum Current Sense Threshold
TG Transition Time:
BG Transition Time:
Sleep Mode
Shutdown
Rise Time
Fall Time
Rise Time
Fall Time
TAPE AND REEL
LTC3835EFE#TRPBF
LTC3835IFE#TRPBF
LTC3835EUFD#TRPBF
LTC3835IUFD#TRPBF
TAPE AND REEL
LTC3835EFE#TR
LTC3835IFE#TR
LTC3835EUFD#TR
LTC3835IUFD#TR
m
(Note 2)
http://www.linear.com/leadfree/
PART MARKING*
LTC3835EFE
LTC3835IFE
3835
3835
PART MARKING*
LTC3835EFE
LTC3835IFE
3835
3835
CONDITIONS
(Note 4); I
(Note 4)
V
(Note 4)
Measured in Servo Loop; ΔI
Measured in Servo Loop; ΔI
I
(Note 5)
RUN = 5V, V
V
V
Measured at V
V
In Dropout
V
V
V
V
(Note 6)
C
C
(Note 6)
C
C
TH
TRACK
IN
RUN
IN
SENSE
RUN
FB
FB
LOAD
LOAD
LOAD
LOAD
http://www.linear.com/tapeandreel/
A
= 1.2V; Sink/Source 5μA (Note 4)
= 4V to 30V (Note 4)
Ramping Down
= 0.7V, V
= 0.7V, V
= 25°C. V
= 0V
Rising
= 3300pF
= 3300pF
= 3300pF
= 3300pF
– = V
= 0V
TH
The
FB
SENSE
SENSE
SENSE
Voltage = 1.2V
FB
= 0.83V (No Load)
l
IN
Relative to Regulated V
denotes the specifi cations which apply over the full operating
+ = 0V
– = 3.3V
– = 3.3V
= 12V, V
PACKAGE DESCRIPTION
20-Lead Plastic TSSOP
20-Lead Plastic TSSOP
20-Pin (4mm × 5mm) Plastic DFN
20-Pin (4mm × 5mm) Plastic DFN
PACKAGE DESCRIPTION
20-Lead Plastic TSSOP
20-Lead Plastic TSSOP
20-Pin (4mm × 5mm) Plastic DFN
20-Pin (4mm × 5mm) Plastic DFN
RUN
TH
TH
Voltage = 1.2V to 0.7V
Voltage = 1.2V to 2V
= 5V unless otherwise noted.
FB
l
l
l
l
l
0.792
0.75
MIN
0.5
98
90
80
8
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
0.800
0.002
–660
–0.1
1.55
99.4
TYP
100
100
0.1
3.5
1.0
0.7
–5
80
10
10
50
50
40
40
LTC3835
0.808
MAX
0.02
–0.5
1.35
–50
125
110
115
0.9
0.5
20
12
90
90
90
80
4
UNITS
mmho
3835fc
3
%/V
mV
mV
nA
μA
μA
μA
μA
ns
ns
ns
ns
%
%
%
%
V
V
V