LP3923 datasheet(11/37 Pages) TI1

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LP3923

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SNVS567B – APRIL 2010 – REVISED MAY 2013

LDO5, LDO6, LDO7 (A-Type) Electrical Characteristics (continued)

Unless otherwise noted, VIN=VIN2=BATT=3.6V, GND = 0V, CV!N1-2 = 10 µF, CLDOx= 1 µF, RX_EN, TX_EN high. Note VINMIN is

the greater of 3.0V or VOUT +0.5V. Typical values and limits appearing in normal type apply for TJ = 25°C. Limits appearing in

boldface type apply over the entire junction temperature range for operation, TA = TJ = −40°C to +125°C.

(1)

Limit

Symbol

Parameter

Conditions

Typical

Units

Min

Max

tSTART-UP

Start-Up Time from Shut-down

COUT = 1 µF, IOUT = 150 mA

(2)

µs

TTransient

Start-Up Transient Overshoot

COUT = 1 µF, IOUT = 150 mA

(2)

LDO8 (D-Type) Electrical Characteristics

Unless otherwise noted, VIN=VIN2=BATT=3.6V, GND = 0V, CV!N1-2 = 10 µF, CLDOx= 1 µF. Note VINMIN is the greater of 3.0V or

VOUT +0.5V. Typical values and limits appearing in normal type apply for TJ = 25°C. Limits appearing in boldface type apply

over the entire junction temperature range for operation, TA = TJ = −40°C to +125°C.

(1)

Limit

Symbol

Parameter

Conditions

Typical

Units

Min

Max

VOUT

Output Voltage Accuracy

IOUT = 1 mA, VOUT = 3.0V

−2

−3

Default Output Voltage

3.0

IOUT

Output Current

VINMIN ≤ VIN ≤ 5.5V

150

Output Current Limit

VOUT = 0V

400

VDO

Dropout Voltage

IOUT = 150 mA

(2) (3)

125

140

ΔVOUT

Line Regulation

VINMIN ≤ VIN ≤ 5.5V, IOUT = 1 mA

Load Regulation

1 mA

≤ IOUT ≤ 150 mA

Output Noise Voltage

10 Hz

≤ f ≤ 100 kHz, COUT = 1 µF

(2)

µVRMS

PSRR

Power Supply Ripple Rejection

F = 10 kHz, COUT = 1 µF, IOUT = 20 mA

(2)

Ratio

tSTART-UP

Start-Up Time from Shut-down

COUT = 1 µF, IOUT = 150 mA

(2)

µs

TTransient

Start-Up Transient Overshoot

COUT = 1 µF, IOUT = 150 mA

(2)

(1)

All limits are specified. All electrical characteristics having room-temperature limits are tested during production with TJ = 25°C. All hot

and cold limits are ensured by correlating the electrical characteristics to process and temperature variations and applying statistical

process control.

(2)

Ensured by design.

(3)

Dropout voltage is the input-to-output voltage difference at which the output voltage is 100 mV below its nominal value. This

specification does not apply in cases it implies operation with an input voltage below the 2.5V minimum appearing under Operating

Ratings. For example, this specification does not apply for devices having 1.5V outputs because the specification would imply operation

with an input voltage at or about 1.5V.

Buck Converter Electrical Characteristics

Unless otherwise noted, VIN = VINB = 3.6V, GND = 0V, CVINB = 10 µF. Typical values and limits appearing in normal type

apply for TJ = 25°C. Limits appearing in boldface type apply over the entire junction temperature range for operation, TA = TJ

−40°C to +125°C.

(1) (2)

Limit

Symbol

Parameter

Conditions

Typ

Units

Min

Max

VFB

Feedback Voltage (BUCK)

3.0V

≤VIN≤ 5.5V

0.5

0.485

0.515

VOUT,PWM

Output Voltage

3.0V

≤VIN≤ 5.5V, IOUT = 150mA

External resistor divider

1.8

1.746

1.854

accuracy not considered.

RFB1=390kΩ RFB2=150kΩ

(3)

(1)

All limits are specified. All electrical characteristics having room-temperature limits are tested during production with TJ = 25°C. All hot

and cold limits are ensured by correlating the electrical characteristics to process and temperature variations and applying statistical

process control.

(2)

Buck output voltage accuracy depends on the accuracy of the external feedback resistors. Resistor values should be chosen for the

divider network to ensure that at the desired output voltage the FB pin is at the specified value of 0.5V. See Buck Converter Application

Information.

(3)

Ensured by design.

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