LP8501 datasheet(7/51 Pages) TI1

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LP8501

www.ti.com

SNVS548D – SEPTEMBER 2008 – REVISED AUGUST 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 LP8501 Block Diagram with: VDD = 3.6V, VEN =

1.65V, COUT = 1 µF, CIN = 1 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 or

0.2

µA

not running

Standby supply current

CHIP_EN=0 (bit), external 32 kHz

0.7

µA

clock not running

CHIP_EN=0 (bit), external 32 kHz

1.4

µA

clock running

External 32 kHz clock running,

charge pump and current source

0.6

IVDD

outputs disabled

Charge pump in 1x mode, no

Normal Mode Supply Current

load, current source outputs

0.8

disabled

Charge pump in 1.5x mode, no

load, current source outputs

1.8

disabled

External 32 kHz clock running

µA

Power Save Mode Supply

Current

Internal oscillator running

0.6

Internal Oscillator Frequency

−4

fOSC

Accuracy

−7

(1)

The Electrical Characteristics tables list ensured 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 ensured.

(2)

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

(3)

Min and Max limits are specified by design, test, or statistical analysis. Typical numbers are not ensured, but do represent the most

likely norm.

(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.

LED DRIVER ELECTRICAL CHARACTERISTICS

Symbol

Parameter

Condition

Min

Typ

Max

Units

ILEAKAGE

Leakage Current (outputs D1 to D9)

0.1

µA

IMAX

Maximum Source Current

Outputs D1 to D9

25.5

−4

IOUT

Output Current Accuracy(1)

Output current set to 17.5 mA

−5

IMATCH

Matching(1)

Output current set to 17.5 mA

fLED

LED Switching Frequency

312

VSAT

Saturation Voltage(2)

Output current set to 17.5 mA

100

(1)

Output Current Accuracy is the difference between the actual value of the output current and programmed value of this current.

Matching is the maximum difference from the average. For the constant current outputs on the part (D1 to D9), the following are

determined: the maximum output current (MAX), the minimum output current (MIN), and the average output current of all outputs (AVG).

Two matching numbers are calculated: (MAX-AVG)/AVG and (AVG-MIN)/AVG. The largest number of the two (worst case) is

considered the matching figure. The typical specification provided is the most likely norm of the matching figure for all parts. Note that

some manufacturers have different definitions in use.

(2)

Saturation voltage is defined as the voltage when the LED current has dropped 10% from the value measured at VOUT – 1V.

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