LT1620IGN datasheet(3/12 Pages) LINER

3 / 12 page

LT1620/LT1621

ELECTRICAL C

HARA TERISTICS

IN+ = 16.8V, VCC = 5V, VIOUT = 2V, TA = 25°C unless otherwise noted.

The q denotes specifications which apply over the full operating

temperature range.

Note 1: Absolute Maximum Ratings are those values beyond which the

life of a device may be impaired.

Note 2: Input bias currents are disabled when VCC is removed, even

with common mode voltage present at IN+, IN–.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Current Sense Amplifier

VOSAVG

Input Offset - Measured at

×10 Output

VCC ≤ VCM ≤ 32V

– 3

(VAVG)

35mV

≤ VID ≤ 125mV

–4

VCM = 0V, VID = 80mV

–10

VOSAVG2

Input Offset - Measured at

×20 Output VCC ≤ VCM ≤ 32V

– 3

(VAVG2)

≤ VID ≤ 35mV

–4

VSENSE

No-Load Output Offset

≤ VCM ≤ 32V, VID = 0V, Referenced to VCC

– 0.1

– 3

IB(IN+, IN–) Input Bias Current (Sink)

VCC ≤ VCM ≤ 32V (Note 2)

200

270

400

µA

185

430

µA

Input Bias Current (Source)

VCM = 0V (Note 2)

4.0

5.25

5.50

Transconductance Amplifier

Amplifier Transconductance

3000

3500

4000

µmho

2200

4800

µmho

Amplifier Voltage Gain

≤ VIOUT ≤ 3V

VOLIOUT

IOUT Saturation Limit (Sink)

IIOUT = 50µA

0.05

0.15

IIOUT = 200µA

0.10

0.30

IIOUT = 1mA

0.35

0.65

VPROG

PROG Input Range

VCC – 1.25

VCC

IBPROG

Input Bias Current

Measured at PROG Pin

VOSPROG

Input Offset Voltage

IIOUT = 130µA– 7

(VAVG – VPROG)

–8

End-of-Cycle Comparator

VPROG2

PROG2 Input Range

VCC – 2.5

VCC – 0.15

VHYST

Input Hysteresis

Measured at AVG2 Pin

IBPROG2

Input Bias Current

Measured at PROG2 Pin

VOLMODE Output Logic Low Output (Sink)

IMODE = 0.5mA

0.1

0.5

IMODE = 10mA

0.5

1.2

PI FU CTIO S

ensure continuity around zero inductor current. Typical out-

put is –3mV with differential input voltage (IN+ – IN–) = 0.

AVG: Sense Amplifier AV = –10 Output and

Transconductance Amplifier Positive Input. Used as inte-

gration node for average current control. Integration time

constant is calculated using 2.5k

Ω typical output imped-

ance.

PROG: Transconductance Amplifier Negative Input. Pro-

gram node for average current delivered to load during

current mode operation. Average current delivered to load

imposes voltage differential at current sense amplifier

VCC: 5V ±10% Power Supply Input.

IN+: Sense Amplifier Positive Input. Typically connected

to inductor side of current sense resistor. Common mode

voltage range is 0V to 32V.

IN–: Sense Amplifier Negative Input. Typically connected

to load side of current sense resistor. Common mode

voltage range is 0V to 32V.

SENSE: Sense Amplifier AV = –1 Output. Used as level-

shifted output for PWM controller current sense input. The

sense output is designed to have an inherent offset to

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