SW

PGND

FB_DCDC

SGND

EN_DCDC

Load

DC-DC

0..750 mA

Load

LIN

0..350 mA

2.7...5.5V

1.8V

1.5V

2.2 PF

Li-Ion

or

3 cell

NiMH/

NiCd

EN_LIN

LM3687

B2

C3

A2

C1

C2

B1

A1

B3

A3

4.7 PF

10 PF

2.2 PH

LM3687

SNVS473A – DECEMBER 2007 – REVISED JULY 2008

www.ti.com

Two enable pins allow the separate operation of either the DC-DC or the Linear Regulator alone or both. If the

regulator provides 350mA output current. In shutdown mode (Enable pins pulled low) the device turns off and

reduces battery consumption to 0.1µA (typ.).

The LM3687 is available in a tiny, lead-free (NO PB) 9-bump micro SMD package. A high switching frequency of

1.8MHz (typ.) allows the use of tiny surface-mount components. Only four external components -one inductor

and three ceramic capacitors- are required.

Typical Application Circuit

Figure 1. Typical Application Circuit: Linear Regulator as Post Regulator

2

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