Top View

A

B

C

D

E

Bottom View

E

D

C

B

A

1

2

3

4

1

2

3

4

LM3646

SNVS962 – DECEMBER 2013

www.ti.com

Connection Diagram

Figure 1. 20-Bump 2.010 mm x 1.610 mm x 0.6mm DSBGA Package YFQ20AAA

PIN DESCRIPTIONS

Pin #

Pin

Name

Description

Count

A1, B1

2

GND

Ground.

A2, B2

2

SW

Drain Connection for Internal NMOS and Synchronous PMOS Switches.

A3, B3, C3

3

OUT

Step-Up DC/DC Converter Output. Connect a 10 µF ceramic capacitor between this pin and GND.

A4,B4

2

LED1

High-Side Current Source Output for Flash LED. Both bumps must be connected for proper operation.

C4, D4

2

LED2

High-Side Current Source Output for Flash LED. Both bumps must be connected for proper operation.

C1

1

AGND

Analog Ground.

D1

1

IN

Input Voltage Connection. Connect IN to the input supply, and bypass to GND with a 10 µF or larger

ceramic capacitor.

E2

1

SDA

Serial Data Input/Output.

D2

1

SCL

Serial Clock Input.

D3

1

ENABLE

Active High Enable Pin. High = Standby, Low = Shutdown/Reset. Has an internal pull-down resistor of

200 k

Ω between ENABLE and GND.

E3

1

STROBE Active High Hardware Flash Enable. Drive STROBE high to turn on Flash LEDs. STROBE overrides

TORCH. Has an internal pull-down resistor of 200 k

Ω between STROBE and GND.

C2

1

TORCH

Active High Hardware Torch Enable. Drive TORCH high to turn on Torch/Movie Mode. Used for

External PWM mode. Has an internal pull-down resistor of 200 k

Ω between TORCH and GND.

E4

1

TX

Configurable Dual Polarity Power Amplifier Synchronization Input. Has an internal pull-down resistor of

200 k

Ω between TX and GND.

E1

1

TEMP

Threshold Detector for LED Temperature Sensing and Current Scale Back.

Table 1. Application Circuit Component List

Component

Manufacturer

Value

Part-Number

Size (mm)

Current/Voltage

Rating(Resistance)

L

TOKO

1 µH

1286AS-H-1R0N

2.0 mm x 1.6 mm x 1.2 mm

COUT1,2

Murata

10 µF

GRM188R60J106M

1.6 mm x 0.8 mm x 0.8 mm(0603)

6.3V

CIN1,2

Murata

10 µF

GRM188R60J106M

1.6 mm x 0.8 mm x 0.8 mm(0603)

6.3V

2

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