TPS60120, TPS60121, TPS60122, TPS60123, TPS60124, TPS60125

REGULATED 200-mA HIGH EFFICIENCY CHARGE PUMP

DC/DC CONVERTERS

SLVS257B – NOVEMBER 1999 – REVISED AUGUST 2000

20

POST OFFICE BOX 655303

APPLICATION INFORMATION

application proposals

paralleling of two TPS6012x to deliver 400-mA total output current

Two TPS6012x devices can be connected in parallel to yield higher load currents. The circuit of Figure 29 can

deliver up to 400 mA at an output voltage of 3.3 V. The devices can share the output capacitors, but each one

requires its own transfer capacitors and input capacitor. If both a TPS60120 and a TPS60121 are used, it is

possible to monitor the battery voltage with the TPS60120 using the low-battery comparator function and to

supervise the output voltage with the TPS60121 using the power-good comparator. Make the layout of the

charge pumps as similar as possible, and position the output capacitor the same distance from both devices.

IN

IN

LBI

C1+

C1–

ENABLE

PGND GND

OUT

OUT

FB

LBO

C2+

C2–

CO

47

µF

Ci

10

µF

Output

3.3 V, 400 mA

C2

2.2

µF

C1

2.2

µF

R1

357 k

Ω

R2

732 k

Ω

Input

1.8 V to 3.6 V

Off/On

IN

IN

NC

C1+

C1–

ENABLE

PGND GND

OUT

OUT

FB

PG

C2+

C2–

C2

2.2

µF

C1

2.2

µF

Ci

10

µF

R3

1 M

Ω

Low Battery

Warning

Power-Good

Signal

R4

1 M

Ω

TPS60120

TPS60121

Figure 29. Paralleling of Two TPS6012x Charge Pumps