Voltage .............................................................. 16V
SW Voltage ................................................– 0.4V to 42V
FB Voltage .............................................................. 2.5V
Current Into FB Pin ..............................................
±1mA
SHDN Voltage ......................................................... 16V
Maximum Junction Temperature ......................... 125°C
PI CO FIGURATIO
TOP VIEW
FB 1
GND 2
SW 3
SW 4
9
8
7
6
5
SHDN
SS
V
IN
GND
DDB PACKAGE
8-LEAD (3mm
×
2mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 80°C/ W
EXPOSED PAD (PIN 9) IS GROUND
(MUST BE SOLDERED TO PCB)
ORDER I FOR ATIO
LEAD FREE FINISH
LT3467EDDB#PBF
LT3467AEDDB#PBF
LT3467IS6#PBF
LT3467ES6#PBF
LT3467AES6#PBF
LEAD BASED FINISH
LT3467EDDB
LT3467AEDDB
LT3467IS5
LT3467ES6
LT3467AES67
TAPE AND REEL
LT3467EDDB#TRPBF
LT3467AEDDB#TRPBF
LT3467IS6#TRPBF
LT3467ES6#TRPBF
LT3467AES6#TRPBF
TAPE AND REEL
LT3467EDDB#TR
LT3467AEDDB#TR
LT3467IS6#TR
LT3467ES6#TR
LT3467AES6#TR
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/
2
U
U
U
W W
W
W
U
U
U
TOP VIEW
SW 1
GND 2
FB 3
6 V
IN
5 SS
4 SHDN
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
T
JMAX
= 125°C,
θ
JA
= 165°C/ W,
θ
JC
= 102°C/ W
PART MARKING*
LCPX
LCKD
LTACH
LTACH
LTBCC
PART MARKING*
LCPX
LCKD
LTACH
LTACH
LTBCC
PACKAGE DESCRIPTION
8-Lead (3mm
×
2mm) Plastic DFN
8-Lead (3mm
×
2mm) Plastic DFN
6-Lead Plastic TSOP-23
6-Lead Plastic TSOP-23
6-Lead Plastic TSOP-23
PACKAGE DESCRIPTION
8-Lead (3mm
×
2mm) Plastic DFN
8-Lead (3mm
×
2mm) Plastic DFN
6-Lead Plastic TSOP-23
6-Lead Plastic TSOP-23
6-Lead Plastic TSOP-23
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
–40°C to 125°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 125°C
–40°C to 85°C
–40°C to 85°C
3467afc
LT3467/LT3467A
The
●
denotes specifications which apply over the full operating
temperature range, otherwise specifications are T
A
= 25°C. V
IN
= 3V, V
SHDN
= V
IN
unless otherwise noted. Specifications are for both
the LT3467 and LT3467A unless otherwise noted.
PARAMETER
Minimum Operating Voltage
Maximum Operating Voltage
Feedback Voltage
●
ELECTRICAL CHARACTERISTICS
CONDITIONS
MIN
TYP
2.2
1.255
10
1.2
0.01
0.01
1.3
2.1
94
88
10
1.8
1.2
330
0.01
MAX
2.4
16
1.270
1.280
50
2
1
0.05
1.6
2.7
UNITS
V
V
V
V
nA
mA
μA
%/V
MHz
MHz
MHz
%
%
%
%
%
A
A
mV
μA
V
V
μA
μA
μA
1.230
1.220
FB Pin Bias Current
Quiescent Current
Quiescent Current in Shutdown
Reference Line Regulation
Switching Frequency
(Note 3)
V
SHDN
= 2.4V, Not Switching
V
SHDN
= 0.5V, V
IN
= 3V
2.6V
≤
V
IN
≤
16V
LT3467
LT3467A
LT3467A
LT3467
LT3467
LT3467A
LT3467A
At Minimum Duty Cycle
At Maximum Duty Cycle (Note 4)
I
SW
= 1.1A
V
SW
= 5V
●
●
●
●
1
1.6
1.6
88
87
82
78
1.4
0.8
Maximum Duty Cycle
Minimum Duty Cycle
Switch Current Limit
Switch V
CESAT
Switch Leakage Current
SHDN Input Voltage High
SHDN Input Voltage Low
SHDN Pin Bias Current
SS Charging Current
2.5
1.9
500
1
0.5
32
0.1
4.5
2.4
V
SHDN
= 3V
V
SHDN
= 0V
V
SS
= 0.5V
16
0
3
2
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
The LT3467E/LT3467AE are guaranteed to meet performance
specifications from 0°C to 85°C. Specifications over the –40°C to 85°C
operating temperature range are assured by design, characterization and
correlation with statistical process controls. LT3467IS6 is guaranteed and
tested over the full –40°C to 125°C operating temperature range.
Note 3:
Current flows out of the pin.
Note 4:
See Typical Performance Characteristics for guaranteed current
limit vs duty cycle.
3467afc
3
LT3467/LT3467A
TYPICAL PERFOR A CE CHARACTERISTICS
Quiescent Current vs
Temperature
1.6
1.4
1.2
I
SHDN
(μA)
1.0
I
Q
(mA)
0.8
0.6
0.4
0.2
0
–40 –25 –10 5
20 35 50 65 80 95 110 125
TEMPERATURE (°C)
3467 G01
V
FB
(V)
Current Limit vs Duty Cycle
2.0
1.8
1.6
1.4
I
LIM
(A)
TYPICAL
OSCILLATOR FREQUENCY (MHz)
1.2
1.0
0.8
0.6
0.4
0.2
0
10
20
30
40
50 60
DC (%)
70
80
90
GUARANTEED
Soft-Start Current vs Soft-Start
Voltage
6
5
T
A
= 25°C
2.0
1.8
1.6
SWITCH CURRENT (A)
4
I
SS
(μA)
3
2
1
0
0
50 100 150 200 250 300 350 400 450 500
V
SS
(mV)
3467 G07
4
U W
T
A
= 25°C
3467 G04
FB Pin Voltage vs Temperature
1.26
1.25
1.24
1.23
1.22
1.21
1.20
–40 –25 –10 5
140
120
100
80
60
40
20
0
20 35 50 65 80 95 110 125
TEMPERATURE (°C)
3467 G02
SHDN Current vs SHDN Voltage
T
A
= 25°C
0
2
4
6
8 10 12
V
SHDN
(V)
14
16
18
3467 G03
Switch Saturation Voltage vs
Switch Current
2.50
2.25
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
Oscillator Frequency vs
Temperature
LT3467A
T
A
= 25°C
V
CESAT
100mV
/DIV
T
A
= 85°C
LT3467
T
A
= –40°C
SW CURRENT 200mA/DIV
3467 G05
0
–50
–25
0
25
50
75
100
3467 G06
TEMPERATURE (°C)
Peak Switch Current vs Soft-Start
Voltage
T
A
= 25°C
V
SHDN
2V/DIV
Start-Up Waveform
(Figure 2 Circuit)
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
50 100 150 200 250 300 350 400 450 500
V
SS
(mV)
3467 G08
V
OUT
1V/DIV
I
SUPPLY
0.5A/DIV
0.5ms/DIV
3467 G09
3467afc
LT3467/LT3467A
PI FU CTIO S
(DFN/TSOT)
FB (Pin 1/Pin 3):
Feedback Pin. Reference voltage is
1.255V. Connect resistive divider tap here. Minimize trace
area at FB. Set V
OUT
= 1.255V(1 + R1/R2).
GND (Pins 2, 5, 9/Pin 2):
Ground. Tie directly to local
ground plane.
SW (Pins 3, 4/Pin 1):
Switch Pin. (Collector of internal
NPN power switch) Connect inductor/diode here and
minimize the metal trace area connected to this pin to
minimize EMI.
V
IN
(Pin 6/Pin 6):
Input Supply Pin. Must be locally
bypassed.
SS (Pin 7/Pin 5):
Soft-Start Pin. Place a soft-start capaci-
tor here. Upon start-up, 4μA of current charges the capaci-
tor to 1.255V. Use a larger capacitor for slower start-up.
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