REG710 datasheet(10/22 Pages) TI

10 / 22 page

EFFICIENCY

LAYOUT

Efficiency(%)=V

/(2

V )

100

(step-upoperatingmode)

(step-downoperatingmode)

OUT

´ 100

ENABLE

GND

OUT

AREA:<0.08sq.inches

REG710

SBAS221F – DECEMBER 2001 – REVISED MARCH 2008............................................................................................................................................... www.ti.com

The efficiency of the charge pump regulator varies

Large transient currents flow in the VIN, VOUT, and

with the output voltage version, the applied input

GND traces. To minimize both input and output

voltage, the load current, and the internal operation

ripple, keep the capacitors as close as possible to the

mode of the device.

regulator using short, direct circuit traces.

The approximate efficiency is given by:

A suggested printed circuit board (PCB) routing is

shown in Figure 21. The trace lengths from the input

and output capacitors have been kept as short as

possible.

Table 2 lists the approximate values of the input

voltage

which

the

device

changes

internal

operating mode. See efficiency curves in the Typical

Characteristics section for various loads and input

voltages.

Figure 21. Suggested PCB Design for Minimum

Ripple

Table 2. Operating Mode Change versus VIN

OPERATING MODE

PRODUCT

CHANGES AT VIN OF

REG710-2.5

> 3.2V

REG710-2.7

> 3.4V

REG710-3

> 3.7V

REG710-3.3

> 4.0V

REG710-5, REG71050,

Step-up only

REG71055

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