LT3513

4

3513fa

ELECTRICAL CHARACTERISTICS

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Switch 3 (250mA BOOST)

FB3 Voltage

●

1.20

1.19

1.22

1.24

1.25

V

V

FB3 Voltage Line Regulation

0.01

0.03

%/V

FB3 Pin Bias Current

(Note 4)

●

30

200

nA

Error Amplifier 3 Voltage Gain

250

V/V

Error Amplifier 3 Transconductance

ΔI = 10μA

220

μmhos

Switch 3 Current Limit

0.25

0.3

0.38

A

200

mV

Switch 3 Leakage Current

FB3 = 1.5V

0.1

1

μA

BIAS Pin Current Due to SW3

18

mA

Maximum Duty Cycle (SW3)

●

84

88

%

Schottky Diode Drop

I = 170mA

900

mV

Switch 4 (250mA Inverter)

NFB4 Voltage

●

–1.205

–1.215

–1.180

–1.155

–1.145

V

V

NFB4 Voltage Line Regulation

0.01

0.03

%/V

NFB4 Pin Bias Current

(Note 4)

●

516

μA

Error Amplifier 4 Voltage Gain

200

V/V

Error Amplifier 4 Transconductance

ΔI = 10μA

220

μmhos

Switch 4 Current Limit

0.28

0.3

0.40

A

200

mV

Switch 4 Leakage Current

NFB4 = –1.5V

0.1

1

μA

BIAS Pin Current Due to SW4

18

mA

Maximum Duty Cycle (SW4)

84

88

%

Schottky Diode Drop (D4)

I = 170mA

700

mV

NPN LDO

FB5 Voltage

●

0.61

0.6

0.625

0.63

0.65

V

V

Base Drive Current

FB5 = 0.5V

6

8

10

mA

LDOPWR Minimum Voltage

BD = 3.5V

4.5

V

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 LT3513E is guaranteed to meet specified performance from

0°C to 125°C junction temperature. Specifications over the –40°C to

125°C operating junction temperature range are assured by design,

characterization and correlation with statistical process controls. The

LT3513I is guarenteed over the full –40°C to 125°C operating junction

temperature range.

above the FB threshold offset.

Note 4: Current flows out of FB1, FB2, FB3 and NFB4.

Note 5: Current limit is guaranteed by design and/or correlation to static

test. Slope compensation reduces current limit at higher duty cycles.

Note 6: This is the minimum voltage across the boost capacitor needed to

guarantee full saturation of the internal power switch.

Note 7: This IC includes overtemperature protection that is intended

to protect the device during momentary overload conditions. Junction

temperature will exceed the maximum operating junction temperature

range when overtemperature protection is active. Continuous operation

above the specified maximum operating junction temperature may impair

device reliability.

The