LTC3458 Linear Technology, LTC3458 Datasheet - Page 3

• Manufacturer Part Number: LTC3458
• Description: 1.4A/ 1.5MHz Synchronous Step-Up DC/DC Converter with Output Disconnect
• Manufacturer: Linear Technology

ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
PARAMETER
SHDN Input High
SHDN Input Low
BURST Mode Peak Current
BURST Threshold Voltage
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: 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.
TYPICAL PERFOR A CE CHARACTERISTICS
2000
1800
1600
1400
1200
1000
–200
800
600
400
200
160
140
120
100
80
60
40
20
0
0
2.0
50
I
Typical Burst Mode Threshold and
Hysteresis vs R
LIMIT
BURST
I
INTO
I
BURST PEAK
ZERO
2.5
I
LIMIT
, I
100
BURST
OUT OF
BURST
3.0
150
R
, T
3.5
BURST
V
BURST
ZERO
IN
(V)
4.0
(kΩ)
200
Currents
V
L = 10µH
R
4.5
OUT
ILIM
W
250
= 7V
= 124k
5.0
3458 G01
3458 G04
U
5.5
300
250
200
150
100
1.8
1,7
1.6
1.4
1.5
50
0
1.5
–45
A
Maximum Load Current in Burst
Current Limit Accuracy
= 25°C. V
R
R
ILIM
–30
CONDITIONS
R
ILIMIT
2.0
ILIM
= 124k
The
–15
= 124k
2.5
= 124k
TEMPERATURE (°C)
3.3V
●
IN
0
3.0
denotes the specifications which apply over the full operating
= 3.3V, V
OUT
15
V
IN
3.5
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
Note 3: The LTC3458 is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
(V)
30
5V
4.0
OUT
OUT
45
4.5
= 5V, R
60
7.5V
5.0
(T
75
3458 G05
3458 G02
OUT
A
5.5
T
= 25°C unless otherwise specified)
90
= 200k, unless otherwise noted.
600
550
500
450
400
350
300
250
200
150
100
●
●
20
10
15
5
0
400
–40
Oscillator Programming Resistor
Burst Mode Quiescent Current
V
V
1.25
MIN
IN
OUT
= 3.3V
600
OSCILLATOR FREQUENCY (kHz)
= 5V
–15
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TEMPERATURE (°C)
800
1.10
TYP
0.4
10
LTC3458
I
I
VIN
VOUT
1000
MAX
35
0.3
1200
60
UNITS
1400
3458 G06
3
3458 G03
3458f
V
V
A
V
85