LP55231 datasheet(5/53 Pages) TI

5 / 53 page

LP55231

www.ti.com

SNOSCR5 – MARCH 2013

ELECTRICAL CHARACTERISTICS

(1) (2) (3)

Limits in standard typeface are for TA = 25°C. Limits in boldface type apply over the operating ambient temperature range

(

−30°C < TA < +85°C). Unless otherwise noted, specifications apply to the LP55231 Block Diagram with: VDD = 3.6V, VEN =

1.65V, COUT = 1.0 µF, CIN = 1.0 µF, C1–2 = 0.47 µF.

(4)

Symbol

Parameter

Condition

Min

Typ

Max

Units

VEN = 0V, CHIP_EN=0 (bit), external 32 kHz clock running

0.2

µA

or not running

Standby supply

current

CHIP_EN=0 (bit), external 32 kHz clock not running

1.0

1.7

µA

CHIP_EN=0 (bit), external 32 kHz clock running

1.4

2.3

µA

External 32 kHz clock running, charge pump and current

0.6

0.75

source outputs disabled

IVDD

Normal Mode

Charge pump in 1x mode, no load, current source outputs

0.8

0.95

Supply Current

disabled

Charge pump in 1.5x mode, no load, current source

1.8

outputs disabled

External 32 kHz clock running

µA

Power Save Mode

Supply Current

Internal oscillator running

0.6

0.75

Internal Oscillator

−4

fOSC

Frequency Accuracy

−7

(1)

The Electrical characteristics tables list specifications under the listed Recommended Conditions except as otherwise modified or

specified by the Electrical Characteristics Conditions and/or Notes. Typical specifications are estimations only and are not verified.

(2)

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

(3)

Min and Max limits are verified by design, test, or statistical analysis.

(4)

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

CHARGE PUMP ELECTRICAL CHARACTERISTICS

Symbol

Parameter

Condition

Min

Typ

Max

Units

Gain = 1.5x

3.5

ROUT

Charge Pump Output Resistance

Ω

Gain = 1x

fSW

Switching Frequency

1.25

MHz

Gain = 1.5x

1.2

IGND

Ground Current

Gain = 1x

0.3

tON

VOUT Turn-On Time

(1)

VDD = 3.6V, IOUT = 60 mA

100

µs

(1)

Turn-on time is measured from the moment the charge pump is activated until the VOUT crosses 90% of its target value.

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