LT3990

3

3990p

ELECTRICAL CHARACTERISTICS

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 LT3990E is guaranteed to meet performance specifications

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

LT3990I is guaranteed over the full –40°C to 125°C operating junction

temperature range.

The

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Minimum Input Voltage

l

4

4.2

V

l

0.7

1.7

0.98

2.7

3.5

μA

μA

μA

Feedback Voltage

l

1.195

1.185

1.21

1.21

1.225

1.235

V

V

FB Pin Bias Current (Note 3)

l

0.1

20

nA

FB Voltage Line Regulation

0.0002

0.01

%/V

Switching Frequency

1.76

640

160

2.25

800

200

2.64

960

240

MHz

kHz

kHz

Switch Current Limit

535

700

865

mA

Catch Schottky Current Limit

350

400

500

mA

300

mV

Switch Leakage Current

0.05

2

μA

Catch Schottky Forward Voltage

650

mV

Catch Schottky Reverse Leakage

0.05

2

μA

Boost Schottky Forward Voltage

875

mV

Boost Schottky Reverse Leakage

0.02

2

μA

Minimum Boost Voltage (Note 4)

l

1.4

1.8

V

BOOST Pin Current

5.5

8

mA

EN Pin Current

1

30

nA

EN Voltage Threshold

l

0.95

1

1.05

V

EN Voltage Hysteresis

30

mV

PG Threshold Offset from Feedback Voltage

80

120

160

mV

PG Hysteresis

12

mV

PG Leakage

0.01

1

μA

PG Sink Current

l

40

80

μA

Minimum Switch On-Time

90

ns

Minimum Switch Off-Time

l

100

160

ns

Note 3: Bias current flows into the FB pin.

Note 4: This is the minimum voltage across the boost capacitor needed to

guarantee full saturation of the switch.