LP38843

SNVS290C – DECEMBER 2004 – REVISED APRIL 2013

www.ti.com

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 = 10 µF CER, COUT = 22 µF CER, CBIAS = 1

µF CER, VS/D = VBIAS. Min/Max limits are specified through testing, statistical correlation, or design.

(1)

Symbol

Parameter

Conditions

MIN

TYP (2)

MAX

Units

VO

Output Voltage Tolerance

10 mA < IL < 3A

0.788

0.812

0.8

VO(NOM) + 1V ≤ VIN ≤ 5.5V

0.776

0.824

4.5V

≤ VBIAS ≤ 5.5V

1.182

1.218

1.2

V

1.164

1.236

1.478

1.523

1.5

1.455

1.545

ΔVO/ΔVIN

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

0.4

0.1

%/A

0.6

VDO

Dropout Voltage (5)

IL = 3A

270

210

mV

500

IQ(VIN)

Quiescent Current Drawn from VIN

10 mA < IL < 3A

35

30

mA

Supply

40

VS/D ≤ 0.3V

1

0.06

µA

30

IQ(VBIAS)

Quiescent Current Drawn from

10 mA < IL < 3A

4

2

mA

VBIAS Supply

6

VS/D ≤ 0.3V

1

0.03

µA

30

ISC

Short-Circuit Current

VOUT = 0V

8

A

Shutdown Input

VSDT

Output Turn-off Threshold

Output = ON

0.7

1.3

V

Output = OFF

0.3

0.7

Td (OFF)

Turn-OFF Delay

RLOAD X COUT << Td (OFF)

20

µs

Td (ON)

Turn-ON Delay

RLOAD X COUT << Td (ON)

15

IS/D

S/D Input Current

VS/D =1.3V

1

µA

VS/D ≤ 0.3V

−1

θJ-A

Junction to Ambient Thermal

TO-220, No Heatsink

65

°C/W

Resistance

DDPAK/TO-263, 1 sq.in Copper

35

AC Parameters

PSRR (VIN)

Ripple Rejection for VIN Input

VIN = VOUT +1V, f = 120 Hz

80

Voltage

VIN = VOUT + 1V, f = 1 kHz

65

dB

PSRR (VBIAS) Ripple Rejection for VBIAS Voltage

VBIAS = VOUT + 3V, f = 120 Hz

58

VBIAS = VOUT + 3V, f = 1 kHz

58

Output Noise Density

f = 120 Hz

1

µV/Hz

en

Output Noise Voltage

BW = 10 Hz

− 100 kHz

150

µV (rms)

VOUT = 1.5V

BW = 300 Hz

− 300 kHz

90

(1)

If used in a dual-supply system where the regulator load is returned to a negative supply, the output pin must be diode clamped to

ground.

(2)

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

(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.

4

Submit Documentation Feedback

Copyright © 2004–2013, Texas Instruments Incorporated

Product Folder Links: LP38843