D3

D2

A3

A2

D1

C1

A1

B1

C2

B2

C3

B3

A3

A2

D3

D2

A1

B1

C1

D1

C2

B2

C3

B3

LM3686

www.ti.com

SNVS520D – AUGUST 2008 – REVISED MARCH 2011

Connection Diagram

Figure 3. 12-pin micro SMD package

Pin Functions

Pin Descriptions

Pin Number

Symbol

Name and Function

A1

PGND

Power Ground pin

A2

SW

Switching node connection to the internal PFET switch and NFET synchronous rectifier.

A3

FB_DCDC

Feedback analog input for the DC-DC converter. Connect to the output filter capacitor.

B1

Power supply input for switcher. Connect to the input filter capacitor.

B2

EN_LILO

Enable input for the linear regulator. The linear regulator is in shutdown mode if voltage at this pin is

< 0.4V and enabled if > 1.1V. Do not leave this pin floating.

B3

EN_DCDC

Enable input for the DC-DC converter. The DC-DC converter is in shutdown mode if voltage at this pin is <

0.4V and enabled if > 1.1V. Do not leave this pin floating.

C1

C2

EN_LDO

Enable input for the linear regulator. The linear regulator is in shutdown mode if voltage at this pin is

< 0.4V and enabled if > 1.1V. Do not leave this pin floating.

C3

QGND

Quiet GND pin for LDO and reference circuit.

D1

Voltage output of the linear regulator.

D2

Voltage output of the low input linear regulator

D3

Order Information

Part Number

Voltage Options

Package Marking

Supplied as

LM3686TL-AADW

1.81.22.8

¢2¢X*$I¢CSUEB

250 units, tape and reel

LM3686TLX-AADW

1.81.22.8

¢2¢X*$I¢CSUEB

3000 units, tape and reel

LM3686TLE-AAED

1.21.82.8

¢2¢X*$I¢CSUEB

250 units, tape and reel

LM3686TLX-AAED

1.21.82.8

¢2¢X*$I¢CSUEB

3000 units, tape and reel

LM3686TLE-AAEF

1.81.23.0

¢2¢X*$I¢CSUEB

250 units, tape and reel

LM3686TLX-AAEF

1.81.23.0

¢2¢X*$I¢CSUEB

3000 units, tape and reel

*Voltage options are read as follow: 1.81.22.8 = 1.8V for VOUT_DC-DC, 1.2V for VOUT_LILO, and 2.8V for

VOUT_LDO;

Contact National Semiconductor for other factory VOUT programmed options.

Table 1. Enable Combinations

EN_DCDC

EN_LILO

EN_LDO

Function

0

0

0

No Outputs

0

0

1

mA

0

1

0

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