LP3921 datasheet(11/41 Pages) TI1

Part #	LP3921

Description	Battery Charger Management and Regulator Unit

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Manufacturer	TI1 [Texas Instruments]

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LP3921

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SNVS580A – AUGUST 2008 – REVISED MAY 2013

LDO5 (RX), LDO6 (TX), LDO7 (GP) Electrical Characteristics

Unless otherwise noted, VIN (=VIN1=VIN2=BATT=VDD) = 3.6V, GND = 0V, CVIN1-2=10 µF, CLDOX=1 µF. RX_EN, TX_EN high.

LDO7 Enabled via Serial Interface. Note VINMIN is the greater of 3.0V or VOUT5/6/7 + 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

Condition

Typ

Units

Min

Max

VOUT5, VOUT6,

Output Voltage

IOUT5/6/7 = 1mA, VOUT5/6/7= 3.0V

−2

+2

%

VOUT7

−3

+3

Default Output

LDO5

3

V

Voltage

LDO6

3

LDO7

3

IOUT5, IOUT6,

Output Current

VINMIN ≤ VIN ≤ 5.5V

150

mA

IOUT7

Output Current Limit

VOUT5/6/7 = 0V

300

VDO5, VDO6, VDO7 Dropout Voltage

IOUT5/6/7 = 150 mA

(2)

200

280

mV

ΔVOUT5, ΔVOUT6,

Line Regulation

VINMIN ≤ VIN ≤ 5.5V

2

mV

ΔVOUT7

IOUT5/6/7 = 1 mA

Load Regulation

1mA

≤ IOUT5/6/7 ≤ 150 mA

10

mV

en5, en6, en7

Output Noise Voltage

10 Hz

≤ f ≤ 100 kHz,

45

µVRMS

COUT = 1 µF

(3)

PSRR

Power Supply

F = 10 kHz, COUT = 1 µF

65

dB

Rejection Ratio

IOUT5/6/7 = 20 mA

(3)

tSTART-UP

Start-Up Time from

COUT = 1 µF, IOUT5/6/7 = 150 mA

40

60

µs

Enable

(3)

tTransient

Start-Up Transient

COUT = 1 µF, IOUT5/6/7 = 150 mA

5

30

mV

Overshoot

(4)

(1)

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

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

control.

(2)

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 3.0V 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.

(3)

Specified by design.

(4)

Internal Thermal Shutdown circuitry protects the device from permanent damage.

Charger Electrical Characteristics

Unless otherwise noted, VCHG-IN = 5V, VIN (=VIN1=VIN2=BATT=VDD) = 3.6V.CCHG_IN = 10 µF. Charger set to default settings

unless otherwise noted. 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 = −25°C to +85°C.

(1) (2)

Limit

Symbol

Parameter

Condition

Typ

Units

Min

Max

VCHG-IN

Input Voltage Range

(3)

4.5

6.5

V

Operating Range

4.5

6

VOK_CHG

CHG_IN OK trip-point

VCHG_IN - VBATT (Rising)

200

mV

VCHG_IN - VBATT (Falling)

50

(1)

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

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

control.

(2)

Junction-to-ambient thermal resistance (

θJA) is taken from thermal modelling result, performed under the conditions and guidelines set

forth in the JEDEC standard JESD51-7. The value of (

θJA) of this product could fall within a wide range, depending on PWB material,

layout, and environmental conditions. In applications where high maximum power dissipation exists (high VIN, high IOUT), special care

must be paid to thermal dissipation issues in board design.

(3)

Specified by design.

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