5

LP55231

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SNOSCR5D – MARCH 2013 – REVISED DECEMBER 2016

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(1)

The Electrical Characteristics tables list specifications under the listed Recommended Operating Conditions except as otherwise

modified or specified by the Electrical Characteristics Test 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.

6.5 Electrical Characteristics

Typical (TYP) values apply for TA = 25°C and minimum (MIN) and maximum (MAX) apply over the operating ambient

temperature range (

−30°C < TA < 85°C). Specifications apply to the LP55231 Functional Block Diagram with: VDD = 3.6 V,

VEN = 1.65 V, COUT = 1 µF, CIN = 1 µF, C1–2 = 0.47 µF, unless otherwise specified.

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

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

IVDD

Standby supply current

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

clock running or not running

0.2

1

µA

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

running

1

1.7

µA

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

running

1.4

2.3

µA

Normal mode supply current

External 32-kHz clock running, charge pump

and current source outputs disabled

0.6

0.75

mA

Charge pump in 1× mode, no load, current

source outputs disabled

0.8

0.95

mA

Charge pump in 1.5× mode, no load, current

source outputs disabled

1.8

mA

Power save mode supply

current

External 32-kHz clock running

10

15

µA

Internal oscillator running

0.6

0.75

mA

ƒOSC

Internal oscillator frequency

accuracy

TA = 25°C

−4%

4%

–7%

7%

(1)

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

(2)

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

6.6 Charge Pump Electrical Characteristics

Typical (TYP) values apply for TA = 25°C and minimum (MIN) and maximum (MAX) apply over the operating ambient

temperature range (

−30°C < TA < 85°C). Specifications apply to the LP55231 Functional Block Diagram with: VDD = 3.6 V,

VEN = 1.65 V, COUT = 1 µF, CIN = 1 µF, C1–2 = 0.47 µF, unless otherwise specified.

(1)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

ROUT

Charge pump output resistance

Gain = 1.5×

Gain = 1×

3.5

1

Ω

ƒSW

Switching frequency

1.25

MHz

IGND

Ground current

Gain = 1.5×

Gain = 1×

1.2

0.3

mA

tON

VOUT turnon time

(2)

VDD = 3.6 V, IOUT = 60 mA

100

µs