Top View

A

B

C

D

E

Bottom View

E

D

C

B

A

1

2

3

4

1

2

3

4

LM2756

SNVS504C – JULY 2007 – REVISED MAY 2013

www.ti.com

DESCRIPTION (CONTINUED)

The device provides excellent efficiency without the use of an inductor by operating the charge pump in a gain of

3/2 or in Pass-Mode. The proper gain for maintaining current regulation is chosen, based on LED forward

voltage, so that efficiency is maximized over the input voltage range.

The LM2756 is available in TI's tiny 20-bump, 0.4mm pitch, thin DSBGA package.

Figure 1. Minimum Layout

Connection Diagram

Figure 2. 20 Bump DSBGA Package

Package Number YFQ0020AAA

PIN DESCRIPTIONS

Bump #s

Pin Names

Pin Descriptions

YFQ0020AAA

A3

VIN

Input voltage. Input range: 2.7V to 5.5V.

A2

VOUT

Charge Pump Output Voltage

A1, C1, B1, B2

C1+, C1-, C2+, C2-

Flying Capacitor Connections

D3, E3,E4, D4

D1A-D4A

LED Drivers - GroupA

C4, B4

D53, D62

LED Drivers - Configurable Current Sinks. Can be assigned to GroupA or GroupB

B3

D1B

LED Drivers - GroupB

C3

D1C

LED Driver - Indicator LED

D2

ISET

Placing a resistor (RSET) between this pin and GND sets the full-scale LED current for

DxA , DxB, D53, D62 and D1C LEDs.

Full-Scale LED Current = 189 × (1.25V ÷ RSET)

E1

HWEN

Hardware Enable Pin. High = Normal Operation, Low = RESET

C2

SDIO

Serial Data Input/Output Pin

E2

SCL

Serial Clock Pin

A4, D1

GND

Ground

2

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