TPS60210, TPS60211, TPS60212, TPS60213

REGULATED 3.3 V, LOW RIPPLE CHARGE PUMP

WITH ULTRALOW OPERATING CURRENT

SLVS296 − JUNE 2000

16

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

APPLICATION INFORMATION

typical operating circuit TPS60210

OUTPUT

3.3 V, 100 mA

INPUT

1.8 V to 3.6 V

ON/OFF

C1

1

µF

C2

1

µF

Co

2.2

µF

Ci

2.2

µF

R1

R2

1

2

3

4

5

6

7

8

9

10

R3

Low Battery

Warning

IN

C1−

C1+

LBI

TPS60210

OUT

C2−

C2+

LBO

GND

SNOOZE

Figure 21. Typical Operating Circuit TPS60210 With Low-Battery Comparator

OUTPUT

3.3 V, 50 mA

INPUT

1.6 V to 3.6 V

ON/OFF

C1

0.47

µF

C2

0.47

µF

Co

2.2

µF

Ci

2.2

µF

R1

R2

1

2

3

4

5

6

7

8

9

10

R3

Low Battery

Warning

IN

C1−

C1+

LBI

TPS60212

OUT

C2−

C2+

LBO

GND

SNOOZE

Figure 22. Typical Operating Circuit TPS60212 With Low-Battery Comparator

The current losses through the resistive divider used to set the low-battery threshold can be avoided if an

additional MOSFET (like BSS138) is used in series to the resistors. This switch is controlled using the SNOOZE

signal. When the SNOOZE-signal is taken high, the device is programmed into normal operating mode, the

switch will turn on and the resistive divider draws current to set the LBI threshold voltage. When SNOOZE is

taken low, the device is programmed into snooze mode during which the low-battery comparator is disabled.

In addition, the resistive divider R1/R2 is disconnected from GND and therefore draws no current from the

battery. A typical schematic for this circuit is shown in Figure 22.