N-Channel Switch Sink Current (DC) (Note 7) .....800mA
Peak SW Sink and Source Current (Note 7) .............1.3A
Operating Temperature Range (Note 2)
LTC3406AE ..............................................– 40°C to 85°C
LTC3406AI .............................................– 40°C to 125°C
Junction Temperature (Notes 3, 6)........................ 125°C
Storage Temperature Range...................– 65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
S5 PACKAGE
5-LEAD PLASTIC TSOT-23
T
JMAX
= 125°C,
θ
JA
= 250°C/W,
θ
JC
= 90°C/W
ORDER INFORMATION
LEAD FREE FINISH
LTC3406AES5#PBF
LTC3406AIS5#PBF
TAPE AND REEL
LTC3406AES5#TRPBF
LTC3406AIS5#TRPBF
PART MARKING*
LTCWJ
LTCWJ
PACKAGE DESCRIPTION
5-Lead Plastic TSOT-23
5-Lead Plastic TSOT-23
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *Temperature grades are 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
SYMBOL
I
VFB
V
FB
∆V
FB
I
PK
V
LOADREG
V
IN
I
S
PARAMETER
Feedback Current
Regulated Feedback Voltage
Reference Voltage Line Regulation
Peak Inductor Current
Output Voltage Load Regulation
Input Voltage Range
Input DC Bias Current
Active Mode
Sleep Mode
Shutdown
Oscillator Frequency
R
DS(ON)
of P-Channel FET
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 3.6V unless otherwise specified.
CONDITIONS
●
MIN
●
●
●
●
TYP
0.6
0.6
0.04
0.04
MAX
±30
0.6120
0.615
0.4
0.6
1.25
UNITS
nA
V
V
%/V
%/V
A
%
(Note 4) LTC3406AE
(Note 4) LTC3406AI
V
IN
= 2.5V to 5.5V (Note 4) LTC3406AE
V
IN
= 2.5V to 5.5V (Note 4) LTC3406AI
V
IN
= 3V, V
FB
= 0.5V
Duty Cycle < 35%
0.5880
0.585
0.75
1
0.5
●
2.5
200
16
0.1
5.5
300
30
1
1.8
0.35
V
μA
μA
μA
MHz
Ω
3406afa
(Note 5)
V
FB
= 0V
V
FB
= 0.63V
V
RUN
= 0V, V
IN
= 5.5V
V
FB
= 0.6V
I
SW
= 100mA
●
f
OSC
R
PFET
1.2
1.5
0.23
2
LTC3406A
ELECTRICAL CHARACTERISTICS
SYMBOL
R
NFET
I
LSW
t
SOFT-START
V
RUN
I
RUN
PARAMETER
R
DS(ON)
of N-Channel FET
SW Leakage
Soft-Start Time
RUN Threshold
RUN Leakage Current
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 3.6V unless otherwise specified.
CONDITIONS
I
SW
= –100mA
V
RUN
= 0V, V
SW
= 0V or 5V, V
IN
= 5V
V
FB
from 10% to 90% Full-Scale
●
●
MIN
TYP
0.21
±0.01
MAX
0.35
±1
1.2
1.5
±1
UNITS
Ω
μA
ms
V
μA
0.6
0.3
0.9
1
±0.01
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 LTC3406AE is 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. The LTC3406AI is guaranteed to meet the
specified performance over the full –40°C to 125°C operating temperature
range.
Note 3:
T
J
is calculated from the ambient temperature T
A
and power
dissipation P
D
according to the following formula:
LTC3406A: T
J
= T
A
+ (P
D
)(250°C/W)
Note 4:
The LTC3406A is tested in a proprietary test mode that connects
V
FB
to the output of the error amplifier.
Note 5:
Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
Note 6:
This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
Note 7:
Limited by long term current density considerations.
TYPICAL PERFORMANCE CHARACTERISTICS
(From Front Page Figure Except for the Resistive Divider Resistor Values)
Efficiency vs Input Voltage
100
90
80
EFFICIENCY (%)
EFFICIENCY (%)
70
60
50
40
30
20
10
0
2
V
OUT
= 1.8V
3
I
L
= 10mA
I
L
= 100mA
I
L
= 600mA
6
3406A G01
Efficiency vs Load Current
100
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
V
OUT
= 1.2V
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
1000
3406A G02
Efficiency vs Load Current
100
90
80
70
60
50
40
30
20
10
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
1000
3406A G03
4
5
INPUT VOLTAGE (V)
0
0.1
1
10
100
OUTPUT CURRENT (mA)
V
OUT
= 2.5V
0
1
0.1
10
100
OUTPUT CURRENT (mA)
3406afa
3
LTC3406A
TYPICAL PERFORMANCE CHARACTERISTICS
(From Front Page Figure Except for the Resistive Divider Resistor Values)
Output vs Load Current
1.820
1.816
1.812
OUTPUT VOLTAGE (V)
1.808
1.804
1.800
1.796
1.792
1.788
1.784
1.780
0
400
200
OUTPUT CURRENT (mA)
600
3406A G04
Efficiency vs Input Voltage
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
EFFICIENCY (%)
100
90
80
70
60
50
40
30
20
10
0
2
V
OUT
= 2.5V
3
I
L
= 10mA
I
L
= 100mA
I
L
= 600mA
6
3406A G05
Reference Voltage vs
Temperature
0.615
0.610
REFERENCE VOLTAGE (V)
0.605
0.600
0.595
0.590
0.585
–50 –25
V
IN
= 3.6V
V
OUT
= 1.8V
4
5
INPUT VOLTAGE (V)
50
25
75
0
TEMPERATURE (°C)
100
125
3406A G06
Oscillator Frequency vs
Temperature
1.60
OSCILLATOR FREQUENCY (MHz)
1.55
1.50
1.45
1.40
1.35
1.30
–50 –25
V
IN
= 3.6V
OSCILLATOR FREQUENCY (MHz)
1.60
1.55
1.50
1.45
1.40
1.35
1.30
1.25
50
25
75
0
TEMPERATURE (°C)
100
125
Oscillator Frequency vs
Input Voltage
Burst Mode
SW
2V/DIV
V
OUT
20mV/DIV
AC COUPLED
I
L
200mA/DIV
1.20
2.0
2.5
3.0
3.5 4.0 4.5 5.0
INPUT VOLTAGE (V)
5.5
6.0
4μs/DIV
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 10mA
Burst Mode OPERATION
3406A G09
3406A G07
3406A G08
R
DS(ON)
vs Input Voltage
0.40
0.35
0.30
R
DS(ON)
(Ω)
R
DS(0N)
(Ω)
MAIN SWITCH
0.25
SYNCHRONOUS
SWITCH
0.20
0.15
0.10
0
1
4
3
5
2
INPUT VOLTAGE (V)
6
7
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
R
DS(ON)
vs Temperature
10
9
V
IN
= 2.7V
V
IN
= 3.6V
DYNAMIC SUPPLY CURRENT (μA)
8
7
6
5
4
3
2
1
0
Dynamic Supply Current
V
OUT
= 1.2V
I
LOAD
= 0A
V
IN
= 4.2V
SYNCHRONOUS SWITCH
MAIN SWITCH
0
75
50
25
TEMPERATURE (°C)
100
125
0
–50 –25
2.0 2.5
3.0
3.5 4.0 4.5 5.0
INPUT VOLTAGE (V)
5.5
6.0
3406A G10
3406A G11
3406A G12
3406afa
4
LTC3406A
TYPICAL PERFORMANCE CHARACTERISTICS
(From Front Page Figure Except for the Resistive Divider Resistor Values)
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