LT1684CS datasheet(3/16 Pages) LINER

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LT1684

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

of the device may be impaired.

Note 2: IC Supply current specification represents unloaded condition and

does not include external FET gate pull up/down currents (GATE +, GATE –

pins). Actual total IC bias currents will be higher and vary with operating

conditions. See Applications Information.

Note 3: PWM inputs are high impedance through

±100mV beyond the

input thresholds.

Note 4: 10k resistor from pin AMPIN to ground.

Note 5: Guaranteed but not tested.

The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.

V + – V – = 20V, Voltages referenced to pin OUT, VOUT = VATREF unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Supply and Protection

DC Supply Current (Note 2)

IN A – IN B

≥ 1.6V

680

950

µA

|V +|

Local Supply Voltages

VGATE+ ≥ V +

6.5

|V –|VGATE– ≤ V

–

VGATE+

Active Tracking Supply FET

IGATE+ = –100µA,

13.2

14.0

14.8

Bias Voltage

ATREF = 0V

VGATE–

Active Tracking Supply FET

IGATE– = 100µA,

–14.8

–14.0

–13.2

Bias Voltage

ATREF = 0V

PWM Receiver

fPWM

Input Carrier Frequency

kHz

VIN

Minimum Valid Differential Input

IN A – IN B or IN B – IN A

1.6

Differential Input Threshold

0.50

0.70

1.00

| IN A – IN B |

RIN

Differential Input Overdrive Impedance

VIN > VTH + 100mV

710

Ω

(Note 3, 5)

RINA,INB

Single-Ended Input Impedance

To Pin OUT

Ω

(Note 5)

BG Buffer

VBGOUT

BGOUT Normalized Voltage

Magnitude |VBGOUT|

1.235

1.250

1.265

1.225

1.250

1.275

VBGOUTOS

Output Offset Voltage

–7

[(VBGOUT+) + (VBGOUT–)]/2

–10

IBGOUTSC

BGOUT Short-Circuit Current

±2

±4.5

RBGOUT

BGOUT Output Impedance

– 2mA

≤ IBGOUT ≤ 2mA

0.2

Ω

BGOUT Rise Time (10% to 90%)

ROUT = 5k, COUT = 10pF

160

300

BGOUT Fall Time (10% to 90%)

ROUT = 5k, COUT = 10pF

260

400

∆tr-f

BGOUT RiseTime – Fall Time

– 200

–100

tpr

BGOUT Propagation Delay PWM Input

ROUT = 5k, COUT = 10pF

340

500

Transition to 10% Output (Rising Edge)

tpf

BGOUT Propagation Delay PWM Input

ROUT = 5k, COUT = 10pF

440

600

Transition to 90% Output (Falling Edge)

∆tp

BGOUT Propagation Delay

– 200

–100

100

Rising Edge – Falling Edge

Output Amplifier

VOUTOS

OUT Offset Voltage

VAMPIN = 0v, IOUT = 0A

– 6

RAMPIN = 10k (Note 4)

–8

ROUT

OUT Output Impedance

–10mA

≥ ILIM+ ≥ –100mA, LIM+ Shorted to OUT

0.01

Ω

10mA

≤ IOUT ≤ 100mA, LIM– Shorted to V–

0.15

Ω

IOUTSC

OUT Short-Circuit Current

LIM + Shorted to OUT

±100

±190

LIM – Shorted to V –

ELECTRICAL CHARACTERISTICS

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