LP3921

SNVS580A – AUGUST 2008 – REVISED MAY 2013

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General Electrical Characteristics

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

Limit

Symbol

Parameter

Condition

Typ

Units

Min

Max

IQ(STANDBY)

Standby Supply

VIN = 3.6V, UVLO on, internal logic

2

5

µA

Current

circuit on, all other circuits off

POWER MONITOR FUNCTIONS

Battery Under-Voltage Lockout

VUVLO-R

Under Voltage Lock-

VIN Rising

2.85

2.7

3.0

V

out

THERMAL SHUTDOWN

Higher Threshold

(2)

160

°C

LOGIC AND CONTROL INPUTS

VIL

Input Low Level

PS_HOLD, SDA, SCL, RX_EN,

0.25*

V

TCXO_EN, TX_EN (2)

VLDO2

PWR_ON, HF_PWR

0.25*

V

(2)

VBATT

VIH

Input High Level

PS_HOLD, SDA, SCL, RX_EN,

0.75*

V

TCXO_EN, TX_EN

VLDO2

(2)

PWR_ON, HF_PWR

0.75*

V

(2)

VBATT

IIL

Logic Input Current

All logic inputs except PWR_ON

-5

+5

µA

and HF_PWR

0V

≤ VINPUT ≤ VBATT

RIN

Input Resistance

PWR_ON, HF_PWR Pull-Down

500

k

Ω

resistance to GND

LOGIC AND CONTROL OUTPUTS

VOL

Output Low Level

PON_N, RESET_N, SDA,

0.25*

V

ACOK_N

IOUT = 2 mA

VLDO2

VOH

Output High Level

PON_N, RESET_N, ACOK_N

0.75*

V

IOUT = -2 mA

VLDO2

(Not applicable to Open Drain

Output SDA)

(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)

Specified by design.

LDO1 (CORE) Electrical Characteristics

Unless otherwise noted, VIN (=VIN1=VIN2=BATT=VDD) = 3.6V, GND = 0V, CVIN1-2=10 µF, CLDOX=1 µF. Note VINMIN is the

greater of 3.0V or VOUT1+ 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

VOUT1

Output Voltage

IOUT1 = 1 mA, VOUT1= 3.0V

−2

+2

%

Accuracy

−3

+3

Output Voltage

Default

1.8

V

(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.

8

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