Toshiba Offers Monolithic DC-DC Step-Down Converters With 1A Output Current

Toshiba America Electronic Components, Inc. (TAEC) announced two new single-chip dc-dc converter ICs with 1A (max.) output current (I_OUT), intended for use as step-down converters in electronic devices to provide a simple power solution with high efficiency of 95% (typ.) that is said to help to reduce system power consumption and product size.

The monolithic dc-dc converters support input voltage (V_IN) from 2.7 to 5.5V. They offer a choice of either adjustable output voltage from 0.8 to (V_IN – 1)V, (typ.), available in the TB7102AF, or fixed output voltage, offered in the TB7101AF, with available output voltages to be specified when ordering of 1.2, 1.5, 1.8, 2.5 or 3.3V. Both devices have low enable threshold voltage (V_IH(EN)) of 1.5V, and V_IL(EN) of 0.5V, at V_IN of 2.7 and 5V.

The two devices integrate high- and low-side MOSFETs, a PWM controller and MOSFET driver into a single monolithic IC. They also include a selection of built-in functions including synchronous rectification, under voltage lockout, thermal shutdown, over current protection, and soft start time. A high 1MHz oscillation frequency allows use of small external components. The TB7101AF and TB7102AF are offered in compact, low thermal resistance PS-8 packages measuring 2.9 x 2.8 x 0.8mm.

"These single chip buck converters combine low on-state resistance (RDS(ON)) internal MOSFETs using synchronous rectification with internal phase compensation to achieve high efficiency with a minimum of external components," said Jeff Lo, Business Development Manager, Discrete Power Devices, for TAEC.

Samples of the Toshiba TB7101AF and TB7102AF monolithic dc-dc converters are available now, with prices in sample quantities starting at $0.72.