LP3905

SNVS374D – JUNE 2006 – REVISED MAY 2013

www.ti.com

LDO Regulator Electrical Characteristics

(1) (2) (3)

The linear regulators have a current rating of Imax= 150mA with COUT = 1.0μF. A 100mA rating applies with COUT = 0.47μF.

Unless otherwise specified, limits are set with VIN = 3.8V, VEN1/2 = 3.8V, CIN = 1μF, COUT = 0.47μF, IOUT = 1.0mA. Limits in

standard typeface are for TJ = 25°C. Limits in boldface type apply over the full junction temperature range (−40°C ≤ TJ ≤

+125°C). Unless otherwise noted, specifications apply to the LP3905 Typical Application Circuit (Figure 1)

(1) (2) (4)

Parameter

Test Conditions

Min

Typ

Max

Units

Output Voltage Tolerance

Over Full Line and Load Regulation

−3

3

%

VIN = 3.8V to 5.5V,

ΔVOUT

Line Regulation Error

0.05

%/V

IOUT = 1mA

Load Regulation Error

IOUT = 1 mA to 100mA

0.003

%/mA

ILOAD

Load Current

See(5)(6)

0

mA

VDO

Dropout Voltage(7)

IOUT = 100mA

80

150

mV

ISC

Short Circuit Current Limit

See(8)

300

500

mA

IOUT

Maximum Output Current

COUT = 1.0μF

150

mA

f = 100Hz, IOUT = 100mA

90

f = 1kHz, IOUT = 100mA

90

PSRR

Power Supply Rejection Ratio(6)

f = 10kHz, IOUT = 100mA

60

dB

f = 50kHz, IOUT = 100mA

35

f = 100kHz, IOUT = 100mA

25

BW = 10Hz to 100kHz,

IOUT = 1mA

13.5

VIN = 4.2V

en

Output Noise Voltage(6)

Buck1 Turned ON with

μVRMS

IOUT = 100mA

15.5

ILOAD= 0mA, Buck2

Turned OFF

Transient Characteristics(6)

VIN = (VOUT(NOM) + 1.0V) to (VOUT(NOM) +

6

1.6V) in 10

μs, IOUT = 1 mA

Line Transient(6)

mV

VIN = (VOUT(NOM) + 1.6V) to (VOUT(NOM) +

6

1.0V) in 10

μs, IOUT = 1mA

IOUT = 1mA to 100mA in 10μs

-70

ΔVOUT

IOUT = 100mA to 1mA in 10μs

30

IOUT = 1mA to 150mA in 10μs

Load Transient(6)

mV

-100

COUT = 1.0μF

IOUT = 150mA to 1mA in 10μs

35

COUT = 1.0μF

Overshoot on Startup

See(6)

20

mV

(1)

All voltages are with respect to the potential at the GND pin.

(2)

Min and Max limits are ensured by design, test or statistical analysis. Typical numbers are not ensured, but do represent the most likely

norm.

(3)

The parameters in the electrical characteristic table are tested at VIN= 3.8V unless otherwise specified. For performance over the input

voltage range refer to datasheet curves.

(4)

CIN, COUT: Low-ESR Surface-Mount Ceramic Capacitors (MLCCs) used in setting electrical characteristics.

(5)

The device maintains a stable, regulated output voltage without a load.

(6)

This specification is ensured by design.

(7)

Dropout voltage is the voltage difference between the input and the output at which the output voltage drops to 100 mV below its

nominal value.

(8)

Short Circuit Current is measured with VOUT pulled to 0v and VIN worst case = 5,5V.

6

Submit Documentation Feedback

Copyright © 2006–2013, Texas Instruments Incorporated

Product Folder Links: LP3905