LTC1626CS datasheet(2/12 Pages) LINER

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LTC1626

ABSOLUTE MAXIMUM RATINGS

(Voltages Referred to GND Pin)

Input Supply Voltage (Pins 1, 2, 13) ............– 0.3V to 7V

Shutdown Input Voltage (Pin 10) ................– 0.3V to 7V

Sense–, Sense+ (Pins 7, 8)........... – 0.3V to (VIN + 0.3V)

LBO, LBI (Pins 3, 4) .................................... – 0.3V to 7V

CT, ITH, VFB (Pins 5, 6, 9) ............. – 0.3V to (VIN + 0.3V)

DC Switch Current (Pin 14) .................................... 1.2A

Peak Switch Current (Pin 14) ................................. 1.6A

Switch Voltage (Pin 14) .......(VIN – 7.5V) to (VIN + 0.3V)

Operating Temperature Range ..................... 0

°C to 70°C

Extended Commercial Operating

Temperature Range (Note 4) ............. – 40

°C to 85°C

Junction Temperature (Note 1) ............................. 125

°C

Storage Temperature Range ................. – 65

°C to 150°C

Lead Temperature (Soldering, 10 sec) .................. 300

°C

PACKAGE/ORDER INFORMATION

Consult factory for Industrial and Military grade parts.

ORDER PART

NUMBER

TOP VIEW

S PACKAGE

14-LEAD PLASTIC SO

PWR VIN

VIN

LBO

LBI

ITH

SENSE–

PWR VIN

PGND

SGND

SHDN

VFB

SENSE+

LTC1626CS

TJMAX = 125°C, θJA = 110°C/ W

ELECTRICAL CHARACTERISTICS T

A = 25°C, VIN = 4.5V, VOUT = 2.5V, VSHDN = 0V, unless otherwise specified.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

IFB

Feedback Pin Current

0.1

µA

VFB

Feedback Voltage

°C to 70°C

1.22

1.25

1.28

–40

°C to 85°C

1.2

1.3

∆VOUT

Output Voltage Line Regulation

VIN = 3.5V to 5.5V, ILOAD = 250mA

– 40

Output Voltage Load Regulation

10mA

≤ ILOAD ≤ 250mA

Burst Mode Output Ripple

ILOAD = 0

mVP-P

Input DC Supply Current (Note 2)

Active Mode

1.9

3.0

Sleep Mode

165

300

µA

Shutdown

VSHDN = VIN

0.5

µA

VLBTRIP

Low-Battery Trip Point

1.15

1.25

1.35

ILBI

Low-Battery Input Bias Current

±0.5

µA

ILBO

Low-Battery Output Sink Current

VLBO = 0.4V

0.4

1.4

VSENSE

Current Sense Threshold Voltage

VSENSE

– = 2.5V, VFB = VOUT/2 + 25mV (Forced)

VSENSE

+ – VSENSE–

VSENSE

– = 2.5V, VFB = VOUT/2 – 25mV (Forced)

130

155

180

RON

ON Resistance of Switch

0.32

0.45

Ω

tOFF

Switch Off-Time (Note 3)

CT = 390pF, ILOAD = 400mA

µs

VIHSD

SHDN Pin High

Minimum Voltage for Device to Be Shut Down

VIN – 0.4

VILSD

SHDN Pin Low

Maximum Voltage for Device to Be Active

0.4

IINSD

SHDN Pin Input Current

≤ VSHDN ≤ 7V

±1

µA

The q denotes specifications that apply over the specified operating

temperature range.

Note 1: TJ is calculated from the ambient temperature TA and power

dissipation according to the following formula:

TJ = TA + (PD • 110°C/W)

Note 2: Dynamic supply current is higher due to the gate charge being

delivered at the switching frequency.

Note 3: In applications where RSENSE is placed at ground potential, the

off-time increases by approximately 40%.

Note 4: C grade device specifications are guaranteed over the 0

°C to 70°C

temperature range. In addition, C grade device specifications are assured

over the – 40

°C to 85°C temperature range by design or correlation, but

are not production tested.

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