LT1513_15 datasheet(3/16 Pages) LINER

Part #	LT1513

Description	SEPIC Constant- or Programmable-Current/ Constant-Voltage Battery Charger

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LT1513/LT1513-2

sn1513 1513fas

ELECTRICAL C

C

HARA TERISTICS

VIN = 5V, VC = 0.6V, VFB = VREF, IFB = 0V, VSW and S/S pins open, unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Error Amplifier Clamp Voltage

High Clamp, VFB = 1V

1.70

1.95

2.30

V

Low Clamp, VFB = 1.5V

0.25

0.40

0.52

V

AV

Error Amplifier Voltage Gain

500

V/ V

VC Pin Threshold

Duty Cycle = 0%

0.8

1

1.25

V

f

Switching Frequency

2.7V

≤ VIN ≤ 25V

450

500

550

kHz

0

°C ≤ TJ ≤ 125°C

430

500

580

kHz

TJ < 0°C

400

580

kHz

Maximum Switch Duty Cycle

q

85

95

%

Switch Current Limit Blanking Time

130

260

ns

BV

Output Switch Breakdown Voltage

0

°C ≤ TJ ≤ 125°C40

47

V

TJ < 0°C35

V

VSAT

Output Switch ON Resistance

ISW = 2A

q

0.25

0.45

Ω

ILIM

Switch Current Limit

Duty Cycle = 50%

q

3.0

3.8

5.4

A

Duty Cycle = 80% (Note 1)

q

2.6

3.4

5.0

A

∆IIN/∆ISW Supply Current Increase During Switch ON Time

15

25

mA/A

Control Voltage to Switch Current

4A/V

Transconductance

Minimum Input Voltage

q

2.4

2.7

V

IQ

Supply Current

2.7V

≤ VIN ≤ 25V

q

4

5.5

mA

Shutdown Supply Current

2.7V

≤ VIN ≤ 25V, VS/S ≤ 0.6V, TJ ≥ 0°C q

12

30

µA

TJ < 0°C50

µA

Shutdown Threshold

2.7V

≤ VIN ≤ 25V

q

0.6

1.3

2

V

Shutdown Delay

q

512

25

µs

S/S Pin Input Current

0V

≤ VS/S ≤ 5V

q

–10

15

µA

Synchronization Frequency Range

q

600

800

kHz

The q denotes specifications which apply over the full operating

temperature range.

Note 1: For duty cycles (DC) between 50% and 85%, minimum

guaranteed switch current is given by ILIM = 1.33 (2.75 – DC).

Note 2: The IFB pin is servoed to its regulating state with VC = 0.8V.

Note 3: Consult factory for grade selected parts.

Note 4: The IFB pin is sevoed to regulate FB to 1.245V

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