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LP55281

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SNVS458D – JUNE 2007 – REVISED OCTOBER 2016

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Copyright © 2007–2016, Texas Instruments Incorporated

Electrical Characteristics (continued)

Unless otherwise noted, specifications apply to Functional Block Diagram with: VVDD1 = VVDD2 = 3.6 V, VVDDIO = 2.8 V, CV

DD =

CVDDIO = 100 nF, COUT = CIN = 10 µF, CV

DDA= 1 µF, C

REF = 100 nF, L1 = 4.7 µH, RRGB = 8.2 kΩ and RRT = 82 kΩ, and limits are

for TJ = 25°C.

(1)(2) (3).

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

(5)

When VIN rises above VOUT + VSchottky, VOUT starts to follow the VIN voltage rise so that VOUT = VIN – VSchottky.

(6)

Data ensured by design.

MAGNETIC BOOST DC-DC CONVERTER ELECTRICAL CHARACTERISTICS

ILOAD

Recommended load current

3 V

≤ VIN

VOUT = 5 V

0

300

mA

3 V

≤ VIN

VOUT = 4 V

0

400

mA

VOUT

Output voltage accuracy

(FB pin)

3 V

≤ VIN ≤ VOUT – 0.5 V

VOUT = 5 V

–30°C < TA < 85°C

–5%

5%

Output voltage (FB pin)

1 mA

≤ ILOAD ≤ 300 mA

VIN > VOUT + VSchottky

(5)

VIN –

VSchottky

V

RDSON

Switch ON resistance

VDD1,2 = 3 V, ISW = 0.5 A

0.4

Ω

VDD1,2 = 3 V, ISW = 0.5 A

–30°C < TA < 85°C

0.8

fBoost

PWM mode switching

frequency

RT = 82 k

Ω

freq_sel[2:0] = 1XX

2

MHz

Frequency accuracy

2.7 V

≤ VDDA ≤ 2.9 V

RT = 82 k

Ω ± 1%

–7%

±3%

7%

2.7 V

≤ VDDA ≤ 2.9 V

RT = 82 k

Ω ± 1%

–30°C < TA < 85°C

–10%

10%

tPULSE

Switch pulse minimum width

no load

30

ns

t

START-UP

Start-up time

Boost start-up from STANDBY(6)

10

ms

ISW_MAX

SW pin current limit

700

800

900

mA

–30°C < TA < 85°C

550

950

RGB DRIVER ELECTRICAL CHARACTERISTICS (R1-4, G1-4, B1-4)

Ileakage

R1-4, G1-4, B1-4 pin leakage

current

5.5 V at measured pin

0.1

µA

5.5 V at measured pin

–30°C < TA < 85°C

1

IRGB

Maximum recommended sink

current

Limited with external resistor RRGB

–30°C < TA < 85°C

40

mA

Accuracy at 15 mA

RRGB = 8.2 kΩ ± 1%

±5%

Current mirror ratio

See(6)

1 : 100

RGB1-4 current mismatch

IRGB = 15 mA

±5%

fPWM

RGB switching frequency

Accuracy defined by internal oscillator,

frequency value selectable

fPWM

AUDIO SYNCHRONIZATION INPUT ELECTRICAL CHARACTERISTICS

ZIN

Input Impedance of ASE1,

ASE2

See(6)

10

15

k

Ω

AIN

ASE1, ASE2 audio input

level range (peak-to-peak)

Min input level needs maximum gain; Max

input level for minimum gain

0

1600

mV

ALED DRIVER ELECTRICAL CHARACTERISTICS

Ileakage

Leakage current

VALED = 5.5 V

0.03

µA

VALED = 5.5 V

–30°C < TA < 85°C

1

IALED

ALED current tolerance

IALED set to 13.2 mA

13.2

mA

IALED set to 13.2 mA

–30°C < TA < 85°C

11.9

14.5

mA

–10%

10%