The TPS6734 is Texas Instruments' new low cost 12-V boost converter IC. This pulsewidth modulated (PWM) current-mode boost converter is capable of supplying 12 V at 120 mA from inputs as low as 4.75 V.
The TPS6734 requires only five external components for operation:
an inductor, a Schottky diode, and two capacitors. Its 170 kHz
oscillator frequency lets you choose small surface mount components:
the entire 12-V boost circuit takes less than 0.75 in.
(4.8 cm.)
on a printed circuit board. For improved efficiency at low voltages,
gate drive for the internal power switch is provided by the 12-V
output after start-up. Softstart can be implemented with one additional
capacitor. An internal 1.22-V, 100-µA reference is also brought
out for use externally.
Designed to be pin-compatible with the MAX734, the TPS6734 features improved shutdown circuitry that reduces quiescent current to 3 µA (max) when disabled. High efficiency at low supply voltages and low supply current in shutdown make the TPS6734 particularly attractive for powering flash memory, PCMCIA cards, and op amps in battery powered equipment. The device is offered in 8-pin plastic DIP and SOIC packages.
To simplify your evaluation of this product, this free EVM contains all the necessary components assembled on a circuit board. The accompanying documentation includes full schematic and components list.
Vol 13, September, 1995
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