LTC3458 datasheet(2/16 Pages) LINER

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LTC3458

3458f

VIN, SS, SYNC Voltages ................................. –0.3 to 7V

BURST, SHDN, VOUT Voltages ....................... –0.3 to 8V

Operating Temperature Range

(Notes 2, 3) .........................................–40°C to 85°C

Storage Temperature Range ..................–65°C to 125°C

SW Voltage

DC ........................................................... –0.3V to 8V

Pulsed <100ns ...................................... –0.3V to 10V

ORDER PART

NUMBER

TJMAX = 125°C, θJA = 45°C/W

LTC3458EDE

ABSOLUTE

AXI U

RATI GS

PACKAGE/ORDER I FOR ATIO

(Note 1)

ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN = 3.3V, VOUT = 5V, RT = 200k, unless otherwise noted.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Minimum VIN Operating Voltage

TA = 0°C to 85°C

1.4

1.5

TA = –40°C to 0°C

1.4

1.7

Output Voltage Adjust Range

●

2.0

7.5

Feedback Voltage

0°C to 85°C, VOUT = 3.3V

1.21

1.23

1.25

–40°C to 0°C

1.20

1.25

Undervoltage (Exit Burst Mode Operation)

Below Feedback Voltage

–4%

Feedback Input Current

VFB = 1.23V

Quiescent Current - Burst Mode Operation

VIN Current at 3.3V

µA

VOUT Current at 5V

µA

Quiescent Current - Shutdown

VIN Current at 3.3V

0.5

µA

VOUT Current at 0V

µA

Quiescent Current - Active

VIN Current Switching

NMOS Switch Leakage

●

0.05

µA

PMOS Switch Leakage

●

0.05

µA

NMOS Switch On Resistance

VOUT = 5V

0.3

Ω

PMOS Switch On Resistance

VOUT = 5V

0.4

Ω

Fixed NMOS Current Limit

RILIM = 124k

●

1.4

1.6

Maximum Duty Cycle

VIN = 3.3V, fOSC = 1MHz

●

Minimum Duty Cycle

●

Frequency Accuracy

RT = 200k

●

0.85

1.15

MHz

Error Amplifier Transconductance

100

µA/V

Error Amplifier Source Current

µA

Error Amplifier Sink Current

µA

SYNC Input High

●

1.5

SYNC Input Low

●

0.35

Consult LTC Marketing for parts specified with wider operating temperature ranges.

VOUT

BURST

GND

COMP

VIN

SYNC

SHDN

ILIM

TOP VIEW

DE12 PACKAGE

12-LEAD (4mm × 3mm) PLASTIC DFN

EXPOSED PAD IS PGND (PIN 13),

MUST BE SOLDERED TO PCB

DE PART MARKING

3458

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