LP3913 datasheet(55/70 Pages) TI1

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VBUCK3L1

BUCK3

VBUCK3L2

VBUCK3

Lsw3

Csw3

VFB3

LOAD

22 2F

2.2 2H

LP3913

www.ti.com

SNVS489I – NOVEMBER 2006 – REVISED SEPTEMBER 2013

BUCK2 Control Register (06)h

D4–0

Access

Read Only

R/W

Data

Reserved

Operation

Force PWM mode

BUCK2 Output Voltage (V)

0: disabled 0: Automatic Modulation Mode

5’h00

Externally controlled

1: enabled

1: Force PWM mode

5’h01

1.80

5’h02

1.90

5’h03

2.00

5’h04

2.10

5’h05

2.20

5’h06

2.30

5’h07

2.40

5’h08

2.50

5’h09

2.60

5’h0A

2.70

5’h0B

2.80

5’h0C

2.90

5’h0D

3.00

5’h0E

3.10

5’h0F

3.20

5’h1x

3.30

Reset

n/a

5’h1F

BUCK3: Synchronous Magnetic DC/DC Converter

The LP3913 is equipped with a synchronous Buck3 magnetic DC-DC converter to supply power to the Flash

memory that has a typical 1.7V-3.3V operating voltage. This voltage is lower than the maximum battery voltage

(4.2V typically for Li-polymer cells) and higher than the minimum battery voltage (typically 2.8V). Therefore, in

order to provide 3.3V, regardless of the battery voltage, the Buck3 converter efficiently steps down the battery

voltage. The Buck3 automatically switches between PWM and PFM modes depending on the load.

By setting bit D6 of the Buck3 control register, the Buck3 will be forced to operate using PWM modulation

regardless of the load. By default, this bit is cleared.

Figure 68. Schematic Section for Buck3 Operation

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