TPS61000, TPS61001, TPS61002, TPS61003, TPS61004, TPS61005, TPS61006, TPS61007

SINGLE- AND DUAL-CELL BOOST CONVERTER WITH START-UP INTO FULL LOAD

SLVS279C – MARCH 2000 – REVISED APRIL 2003

14

POST OFFICE BOX 655303

APPLICATION INFORMATION

The TPS6100x boost converter family is intended for systems that are powered by a single-cell NiCd or NiMH

battery with a typical terminal voltage between 0.9 V to 1.6 V. It can also be used in systems that are powered

by two-cell NiCd or NiMH batteries with a typical stack voltage between 1.8 V and 3.2 V. Additionally, single-

or dual-cell, primary and secondary alkaline battery cells can be the power source in systems where the

TPS6100x is used.

programming the TPS61000 and TPS61007 adjustable output voltage devices

The output voltage of the TPS61000 and TPS61007 can be adjusted with an external resistor divider. The typical

value of the voltage on the FB pin is 500 mV in fixed frequency operation and 485 mV in the power-save

operation mode. The maximum allowed value for the output voltage is 3.3 V. The current through the resistive

divider should be about 100 times greater than the current into the FB pin. The typical current into the FB pin

is 0.01

µA, and the voltage across R4 is typically 500 mV. Based on those two values, the recommended value

for R4 is in the range of 500 k

Ω in order to set the divider current at 1 µA. From that, the value of resistor R3,

R3

+ R4

V

O

V

FB

* 1

+ 500 kΩ

V

O

500 mV

* 1

(1)

If, as an example, an output voltage of 2.5 V is needed, a 2-M

Ω resistor should be chosen for R3.

VBAT

VOUT

LBO

5

10

3

R5

R3

R4

6

TPS61007

LBI

9

FB

COMP

2

CC1

100 pF

CC2

33 nF

RC

10 k

Ω

EN

R2

R1

1

GND

SW

7

4

Ci

10

µF

10 V

CO

22

µF

10 V

Low Battery

Warning

L1

33

µH

D1

FBGND

8

VO

Alkaline Cell

Figure 18. Typical Application Circuit for Adjustable Output Voltage Option

The TPS61007 is an improved version of the TPS61000 adjustable output voltage device. The FBGND pin is

internally connected to GND.