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AP3605

CHARGE PUMP CURRENT SOURCE FOR LED DRIVER WITH BRIGHTNESS CONTROL

BCD Semiconductor 

Product Brief

CHARGE PUMP CURRENT SOURCE FOR LED DRIVER WITH BRIGHTNESS CONTROL

AP3605

Description

BCD Semiconductor Manufacturing Limited

The AP3605 is a step-up DC/DC converter based on 1.5x

charge pump current source, it is specially designed for

LED supplies in backlight display.

The AhPt3t6p0:5//cwanwprwov.ibdeccdonssetamnt ci.ucrroenmt up to 20mA for

each LED, which is programmed by an external resistor,

so it has a total capability to provide 80 mA for 4 LEDs.

The chip has a good performance of LED current

matching and allows PWM brightness dimming control.

Additionally, high switching frequency up to 1 MHz

enables the use of two small external flying capacitors.

Internal soft-start circuitry prevents excessive inrush

current during start-up.

The AP3605 supply voltage range is from 2.7V to 5.5 V,

ideally suited for applications powered by the Li-ion

battery.

Parametric Table

Input Voltage (V)

Supply Current (Typ) (mA)

Operating Frequency (Typ) (MHz)

Efficiency (Typ) (%)

Output Current (Max) (mA)

Current Matching (Min/Max) (%)

Soft Start Time (Typ) (µS)

Standby Time (Typ) (ms)

Package

2.7 to 5.5

1.5

1.0

93

120

±3

400

2.0

QFN-3x3-

16

The AP3605 is available in a 3mm*3mm QFN-3x3-16

tiny package. Its operating temperature range is -40oC to

85oC

Features IMPORTANT NOTICE

Benefits

or Manufacturing Limited reserves the right to make changes without further notice

D Semiconducto·r ManuRfeagctuulraintegdLOimuittpedutdCoeusrnreont taswsuitmhe±a3n%y rMespaotcnhsiibniglity for use

to

of

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Range

nor does BCD S·emicoRndeugcutloartMedan±u1f0a%ctuOrinugtpLuitmCituedrraesnstumSoeuarncyeliability arising out of·the apHpiligchatCiounrorer nutseMatching Precision

or circuits. BCD·SemiDcornivdeucutoprtMo a4nLufEacDtusriantg2L0immiAtedEdaocehs not convey any license un·der itsBpuaiteltn-tinrigShtatsnodrby to Make PWM Dimming Control

rights of others.· Wide Operating Voltage Range: 2.7V to 5.5V

Optimized

· High Efficiency up to 93%

anufacturing Limit·ed High Operating FrequenBcCyD: S1eMmiHcoznductor Manufacturing Limited

Additional Available Materials nductor Manufacturin·g LimiteBd uilt-in Soft-Start to Lim-AIdiCvtaDtnehcseiedgnAIGnnarrolouugpsChircCuiutsr(Srheanntghai) Corporation

· 200233, China

+86-21-5450 0008

LED Brightness Contro8TlFe,lt:Zh+o8rn6oe-2Bu1,-g9604h09,5YP9i5WS3h9a,MnFaRxo:aa+dn8,6Sd-h2a1nA-g6h4na8i5a29l0o6072g333, China

FFICE

Signal

· Built-in Standby ModeTaitwoan OMffiaceke PWM Dimming

SnhdauncgtohraMi) CanourpfaocrtautriionngSChoe.n, zLhCtedn.oSOnhfeftinrczoehlenOOpffitciemized

BCD Semiconductor (Taiwan) Company Limited

4F, 298-1, Rui Guang Road, Nei-Hu District, Taipei,

o.1006, 3rd Fuzhong R·oad, FutiaBn uDiisltrti-cti,nShOenzTheSn D5180(2O6, vCheinraTeTTmeali:wp+a8en8r6a-2t-u26r5e6 2S80h8utdown) Func-

tion to Protect the DevicFeaxf:r+o88m6-2-B26u56r2n80O6 ut

· Samples

UBCS·AD OSefmficiecPonrdeulcitomr CinoraproyratDionatasheet

· Demo 30920 Huntwood Ave.

CA 94544, U.S.A

Hayward,

Board

TFea·lx:: ++11--551100A--3322p44p--22l79i88c88 ation Note

· ESD Report

Applications

· Mobile Phone

· MP3, MP4

· White LED Backlight in Mobile Phone, PDA

Jul. 2007

BCD Semiconductor Manufacturing Limited

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