LM3686 datasheet(2/27 Pages) TI

Part #	LM3686

Description	Step-Down DC-DC Converter with Integrated Post Linear Regulators System and Low-Noise Linear Regulator

PDF	27 Pages

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Manufacturer	TI [Texas Instruments]

Direct Link	http://www.ti.com

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2 / 27 page

VREF

digital

driver

VIN_LILO

QGND

(Analog ground)

VBATT

PGND

(Power ground)

VOUT_LILO

LILO

LDO

Buck System

VOUT_LDO

VIN_LDO/VIN_VBATT

Analog

Buck

(e.g., error amp)

VBATT

PGND

QGND

EN_DCDC

EN_LDO

2.7V to 5.5V

Dual Rail

LILO

350 mA

3 MHz

DC/DC

Linear Regulator

300 mA

1 PH

10 PF

0603

0.7V to 2V

350 mA

LILO

LDO

300 mA

2.2 PF,

0402

1.2 to 3.3V

FB_DCDC

LM3686

4.7 PF, 0603

VIN_LILO

VIN_LDO

EN_LILO

QGND

1 PF, 0402

QGND

PGND

1.8V

1 PF,

0402

QGND

LM3686

SNVS520E – AUGUST 2008 – REVISED MAY 2013

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DESCRIPTION (CONTINUED)

The LM3686 is available in a 12-bump DSBGA package. A high-switching frequency of 3 MHz (typ.) allows the

use of a few tiny surface-mount components. Only six external surface-mount components, an inductor and five

ceramic capacitors, are required to establish a 15.66 mm2 total solution size.

Typical Application Circuit

Figure 1. Typical Application

Figure 2. Functional Diagram (Always Connenct VIN_LDO to VBATT)

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