LP3929

High Speed Bi-Directional Level Shifter and Ultra

Low-Dropout CMOS Voltage Regulator and Line

Protection

General Description

The LP3929 is designed for portable and wireless applica-

tions requiring level translation and power supply generation

in a compact footprint.

The device level translates 1.8 V LVCMOS on the host (A)

side to 2.85 V LVCMOS levels on the card (B) side for a

miniSD / SD 4-bit bi-directional data bus.

Independent direct control of the CMD, Data0 and Data1-3

paths support mini SD state machine requirements. A shut-

down pin is provided for the level shifters and regulator. The

f_CLK_A is a feedback clock to the host which can be used

to overcome level shifter bus delay.

The built-in low-dropout voltage regulator is ideal for mobile

phone and battery powered wireless applications. It provides

up to 200 mA from a 3.05 V to 5.5 V input. It is stable with

capacitors, requiring smallest possible PC board area.

The card (B port) side channels have integration of ASIP

(Application Specific Integrated Passives) - on chip inte-

grated pull-up, pull-down, series resistors and capacitors for

EMC filtering. It is designed to tolerate IEC61000-4-2 level 4

Key Specifications

Level Shifter:

n

6-signal Level Shifter (5 bi-directional and 1

uni-direction)

n

3 ns (typ) propagation delay

n

Low-Dropout Regulator:

n

3.05 V to 5.5 V input range

n

2.85 V at 200 mA

n

Fast Turn-On time: 30 µs (typ)

n

110 mV (max) dropout with 200 mA load

n

Thermal shutdown at 160˚C (typ)

Protection Block (B Side):

n

Direct Contact

n

ASIP / EMI Filtering

Features

n

Ultra small micro SMD 24 bump package

n

6-signal level translation 1.8 V to 2.85 V

n

LDO stable with ceramic and high quality tantalum

capacitors

Typical Application Circuit

20186801

July 2006

© 2006 National Semiconductor Corporation

DS201868

www.national.com