V

IN

Enable

3

5

4

6

1

V

OUT

2

GND

Thermal

Control

&

REG710

C

IN

2.2 F

m

C

OUT

2.2 F

m

C

PUMP

0.22 F

m

REG71050, REG71055, REG710

SBAS221H – DECEMBER 2001 – REVISED OCTOBER 2015

www.ti.com

8.2 Functional Block Diagram

8.3 Feature Description

8.3.1 Shutdown Mode

The EN pin enables the IC when pulled high and places it into energy-saving shutdown mode when pulled low.

When in shutdown mode, the output is disconnected from the input and the quiescent current is reduced to 0.01

operating voltage. The EN pin cannot be left floating and must be actively terminated either high or low.

8.3.2 Protection

The regulator includes thermal shutdown circuitry protecting the device from damage caused by overload

conditions. The thermal protection circuitry disables the output when the junction temperature reaches

approximately 160°C, allowing the device to cool. When the junction temperature cools to approximately 140°C,

the output circuitry is automatically reenabled. Continuously operating the regulator into thermal shutdown can

degrade reliability. The regulator also provides current limit to protect itself and the load.

8.4 Device Functional Modes

8.4.1 Peak Current Reduction

In normal operation, the charging of the pump and the output capacitors usually leads to relatively high peak

input currents which can be much higher than the average load current. The regulator incorporates circuitry to

limit the input peak current, lowering the total EMI emission and lowering the output voltage ripple and the input

8.4.2 Efficiency

The efficiency of the charge pump regulator varies with the output voltage version, the applied input voltage, the

load current, and the internal operation mode of the device.

The approximate efficiency is given by:

8

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