LP3913 datasheet(47/70 Pages) TI1

47 / 70 page

LP3913

www.ti.com

SNVS489I – NOVEMBER 2006 – REVISED SEPTEMBER 2013

IMR Register (0c)h Interrupt Mask Register

D7–0

Access

r/w

Data

1: Enable INTn (n=0…7) to pull IRQB low

0: Mask Interrupt source INTn

Reset

8’h00

IRQ Register (0d)h Interrupt Request Register

D7–0

Access

Read only

Data

1: Interrupt IRQn (n=0…7) requested

0: No interrupt requested

Reset

8’h00

DC/DC Converters

Overview

The LP3913 provides the DC/DC converters that supply the various power needs of the application by means of

one Buck3 (HDD driver), two Linear Low Drop Regulators (LDO1, LDO2) and two Buck converters (BUCK1,

BUCK2).

The following table lists the output characteristics of the various regulators.

Supply Specification

VOUT (Volts)

IMAXMaximum Output

Supply

Load

Current (mA)

Default (V)

Range (V)

Resolution (mV)

LDO1

various

2.0

1.2 to 3.3

100

150

LDO2

analog

3.3

1.3 to 3.3

100

150

BUCK1

CPU, DSP

1.2

0.8 to 2.0

600

BUCK2

IO, Logic,

3.3

1.8 to 3.3

100

600

Memories

BUCK3

Flash

3.3

1.8 to 3.3

500

Linear Low Dropout Regulators (LDOS)

LDO1 is a regulator that can respond to fast transients and is slated for digital loads and high bandwidth analog

loads. LDO2 is a linear regulator with a similar architecture but has a slower transient response time with a lower

noise performance to supply analog loads. The output voltages of both LDOs are register programmable through

the I2C interface. The default output voltages are factory programmed during Final Test.

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