Datasheet

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 • DALLAS, TEXAS 75265
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–
C
O
47 µF
Ci
10 µF
Output
3.3 V, 400 mA
C2
2.2 µF
C1
2.2 µF
R1
357 kΩ
R2
732 kΩ
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
C
i
10 µF
R3
1 MΩ
Low Battery
Warning
Power-Good
Signal
R4
1 MΩ
TPS60120 TPS60121
Figure 29. Paralleling of Two TPS6012x Charge Pumps