LP3972 datasheet(8/59 Pages) TI1

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LP3972

SNVS468J – SEPTEMBER 2006 – REVISED AUGUST 2011

www.ti.com

Default Voltage Option

(1) (2)(3) (continued)

LDO1

SYS_EN

1.8

SYS_EN

1.8

LDO2

SYS_EN

1.8E

SYS_EN

1.8E

LDO3

SYS_EN

LDO4

SYS_EN

LDO5

PWR_EN

1.4

PWR_EN

1.4

BUCK1

PWR_EN

1.4

PWR_EN

1.4

BUCK2

SYS_EN

3.3

SYS_EN

3.3

BUCK3

SYS_EN

1.8

SYS_EN

1.8

Version

LP3972SQ-I414

LP3972SQ-0514

Enable

Version I

Version 0

LDO_RTC

—

2.8

Tracking enabled

3.3 w/ tracking

LDO1

SYS_EN

1.8

SYS_EN

1.8

LDO2

SYS_EN

1.8E

SYS_EN

1.8E

LDO3

SYS_EN

3.3E

LDO4

SYS_EN

LDO5

PWR_EN

1.4

PWR_EN

1.4

BUCK1

PWR_EN

1.4

PWR_EN

1.4

BUCK2

SYS_EN

3.0

SYS_EN

3.3

BUCK3

SYS_EN

1.8

SYS_EN

1.8

Version

LP3972SQ-5810

Enable

Version 5

LDO_RTC

2.8

LDO1

SYS_EN

1.8

LDO2

SYS_EN

1.8E

LDO3

SYS_EN

2.5E

LDO4

PWR_EN

1.3E

LDO5

PWR_EN

1.1

BUCK1

PWR_EN

1.35

BUCK2

SYS_EN

1.2

BUCK3

SYS_EN

1.8

LDO RTC

Unless otherwise noted, VIN = 3.6V, CIN = 1.0 µF, COUT = 0.47 µF, COUT (VRTC) = 1.0 µF ceramic. 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,

−40°C to +125°C.

(1) (2) (3) and (4)

Symbol

Parameter

Test Conditions

Min

Typ

Max

Unit

VOUT Accuracy Output Voltage Accuracy

VIN Connected, Load Current = 1 mA

2.632

2.8

2.968

(1)

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

(2)

All limits guaranteed at room temperature (standard typeface) and at temperature extremes (bold typeface). All room temperature limits

are production tested, guaranteed through statistical analysis or guaranteed by design. All limits at temperature extremes are

guaranteed via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing

Quality Level (AOQL).

(3)

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

(4)

LDO_RTC voltage can track LDO3 voltage. LP3972 has a tracking function (nIO_TRACK). When enabled, LDO_RTC voltage will track

LDO3 voltage within 200mV down to 2.8V when LDO3 is enabled

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