ltc3523-ltc3523-2 Linear Technology Corporation, ltc3523-ltc3523-2 Datasheet - Page 3

• Manufacturer Part Number: ltc3523-ltc3523-2
• Description: Synchronous 600ma Step-up And 400ma Step-down Dc/dc Converters
• Manufacturer: Linear Technology Corporation

ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifi cations are at T
otherwise specifi ed.
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 reli-
ability and lifetime.
Note 2: The LTC3523/LTC3523-2 are guaranteed to meet performance
specifi cations from 0°C to 85°C. Specifi cations over the –40°C to 85°C
operating temperature range are assured by design, characterization and
correlation with statistical process control.
Note 3: The LTC3523/LTC3523-2 include an overtemperature shutdown
that is intended to protect the device during momentary overload condi-
tions. Junction temperature will exceed 125°C when the overtemperature
shutdown is active. Continuous operation above the specifi ed maximum
operating junction temperature may impair device reliability.
PARAMETER
MODE Leakage Current
Soft-Start Time
Step-Up Converter
Input Voltage Range
Output Voltage Adjust Range
Feedback Voltage FB1
Feedback Input Current FB1
N-Channel Switch Leakage
P-Channel Switch Leakage
N-Channel Switch On Resistance
P-Channel Switch On Resistance
Peak Inductor Current
Current Limit Delay to Output
Maximum Duty Cycle
Minimum Duty Cycle
Step-Down Converter
Input Voltage Range
Output Voltage Range
Feedback Voltage FB2
Feedback Input Current FB2
Reference Voltage Line Regulation
Output Voltage Line Regulation
Output Voltage Load Regulation
Maximum Duty Cycle
Peak Inductor Current
N-Channel Switch On Resistance
P-Channel Switch On Resistance
SW Leakage
CONDITIONS
V
(Note 6)
V
V
V
V
V
V
V
(Note 7)
(Note 6)
V
V
(Note 6)
V
I
I
I
(Note 7)
V
V
V
OUT
OUT
OUT
MODE
FB1
SW
SW
OUT
OUT
OUT
OUT
FB
FB
FB2
IN2
IN2
⎯ S ⎯ H ⎯ D ⎯ N ⎯ 2
= 1V
= 1.5V
= 5.5V
= 5.5V, V
= 100mA (Notes 5, 6)
= 100mA, 1.6V < V
= 0mA to 600mA (Note 6)
= 2.4V
= 2.4V
= 1.25V
= 0.625V
= 3.3V, I
= 5V, I
= 3.3V, I
= 5V, I
= 5.5V
= 0V, V
A
= 25°C. V
SW
SW
OUT
SW
SW
SW2
= 100mA
= 100mA
The
= 100mA
= 100mA
= 0V
= 0V or 5V, V
●
IN1
denotes the specifi cations which apply over the full operating
IN
= V
< 5.5V (Note 6)
Note 4: Current is measured into the V
strapped to the output for the step-up. The current will refl ect to the input
supply by: (V
Note 5: The LTC3523/LTC3523-2 are tested in a propriety test mode that
connects FB2 to the output of the error amplifi er.
Note 6: Specifi cation is guaranteed by design and not 100% tested in
production.
Note 7: Current measurements are performed when the LTC3523/
LTC3523-2 are not switching. The current limit values in operation will be
somewhat higher due to the propagation delay of the comparator.
IN2
= V
IN
= 5.5V
IN3
= 2.4V, V
OUT
/V
IN
) • Effi ciency. The outputs are not switching in sleep.
LTC3523/LTC3523-2
OUT
= 3.3V, V
●
●
●
●
●
●
●
●
●
●
0.615
1.16
MIN
600
585
400
OUT(STEP-DOWN)
1.8
1.8
1.8
80
OUT
pin since the supply is boot-
1000
TYP
0.01
1.20
0.20
0.20
0.36
0.22
0.33
0.31
0.04
0.04
0.33
0.58
0.20
500
600
100
650
1.0
40
87
0
0
= 1.2V unless
MAX
5.25
5.25
1.23
5.25
615
±50
5.5
50
1
2
2
0
2
UNITS
3
3523f
%/V
%/V
mA
mV
mA
μA
nA
μA
μA
nA
μA
μs
ns
%
%
%
%
Ω
Ω
Ω
Ω
Ω
Ω
V
V
V
V
V