LP3893 datasheet(3/16 Pages) TI

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LP3893

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SNVS237B – SEPTEMBER 2003 – REVISED APRIL 2013

ELECTRICAL CHARACTERISTICS

Limits in standard typeface are for TJ = 25°C, and limits in boldface type apply over the full operating temperature range.

Unless otherwise specified: VIN = VO(NOM) + 1V, VBIAS = 4.5V, IL = 10 mA, CIN = COUT =10 µF, VS/D = VBIAS.

Symbol

Parameter

Conditions

Typical (1)

MIN (2)

MAX (2)

Units

Output Voltage Tolerance

10 mA

≤ IL ≤ 3A

1.198

1.234

1.216

VO(NOM) + 1V ≤ VIN ≤ 5.5V

1.186

1.246

4.5V

≤ VBIAS ≤ 6V

1.478

1.522

1.5

1.455

1.545

1.773

1.827

1.8

1.746

1.854

ΔVO/ΔVI

Output Voltage Line Regulation (3)

VO(NOM) + 1V ≤ VIN ≤ 5.5V

0.01

%/V

ΔVO/ΔIL

Output Voltage Load Regulation (4)

10 mA

≤ IL ≤ 3A

0.04

%/A

0.06

VDO

Dropout Voltage (5)

IL = 3A

650

270

1000

IQ(VIN)

Quiescent Current Drawn from VIN

10 mA

≤ IL ≤ 3A

Supply

VS/D ≤ 0.3V

0.03

µA

IQ(VBIAS)

Quiescent Current Drawn from VBIAS

10 mA

≤ IL ≤ 3A

Supply

VS/D ≤ 0.3V

0.03

µA

ISC

Short-Circuit Current

VOUT = 0V

Shutdown Input

VSDT

Output Turn-off Threshold

Output = ON

0.7

1.3

Output = OFF

0.7

0.3

Td (OFF) Turn-OFF Delay

RLOAD X COUT << Td (OFF)

µs

Td (ON)

Turn-ON Delay

RLOAD X COUT << Td (ON)

IS/D

S/D Input Current

VS/D =1.3V

µA

VS/D ≤ 0.3V

−1

AC Parameters

PSRR

Ripple Rejection for VIN Input Voltage

VIN = VOUT +1V, f = 120 Hz

(VIN)

VIN = VOUT + 1V, f = 1 kHz

PSRR

Ripple Rejection for VBIAS Voltage

VBIAS = VOUT + 3V, f = 120 Hz

(VBIAS)

VBIAS = VOUT + 3V, f = 1 kHz

Output Noise Density

f = 120 Hz

µV/root

−

Output Noise Voltage

BW = 10 Hz

− 100 kHz, VOUT = 1.8V

150

µV (rms)

BW = 300 Hz

− 300 kHz, VOUT = 1.8V

(1)

Typical numbers represent the most likely parametric norm for 25°C operation.

(2)

Limits are specified through testing, statistical correlation, or design.

(3)

Output voltage line regulation is defined as the change in output voltage from nominal value resulting from a change in input voltage.

(4)

Output voltage load regulation is defined as the change in output voltage from nominal value as the load current increases from no load

to full load.

(5)

Dropout voltage is defined as the minimum input to output differential required to maintain the output with 2% of nominal value.

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