The ISL97656 is a high frequency, high efficiency step-up voltage regulator operated at constant frequency PWM mode. With an internal 4.0A, 120mΩ MOSFET, it can deliver up to 2A output current at over 90% efficiency. The selectable 640kHz and 1.2MHz allows smaller inductors and faster transient response. An external compensation pin gives the user greater flexibility in setting frequency compensation allowing the use of low ESR Ceramic output capacitors. When shut down, it draws <1µA of current and can operate down to 2.3V input supply. These features along with 1.2MHz switching frequency makes it an ideal device for portable equipment and TFT-LCD displays. The ISL97656 is available in a 10 Ld TDFN package with a maximum height of 1.1mm. The device is specified for operation over the full -40°C to +85°C temperature range.
The ISL97656 is a high‑frequency, high‑efficiency step‑up voltage regulator with an integrated 4 A power MOSFET. It operates in constant‑frequency PWM mode, offers selectable 640 kHz or 1.2 MHz switching frequencies, and shuts down with less than 1 pA current. The device is supplied in a 10‑lead thin‑dual‑flat‑no‑lead (TDFN) package suitable for portable equipment and TFT‑LCD displays.
The datasheet details absolute maximum ratings, thermal information, electrical specifications, pin functions, and typical application circuits. It includes performance curves for efficiency, load and line regulation, transient response, and design guidelines for inductors, capacitors, Schottky diodes, and loop compensation, as well as soft‑start and shutdown behavior.
| Input Voltage Range | 2.3 V – 6.0 V |
|---|---|
| Output Voltage Range | 5 V – 25 V |
| Switching Frequency Options | 640 kHz or 1.2 MHz |
| Integrated MOSFET Current Limit | 4.0 A (guaranteed 3 A) |
| Shutdown Current | < 1 pA |
| Efficiency | up to 290 % |
| Operating Temperature Range | -40 °C to +85 °C |
| Package | 10‑lead TDFN, 0.8 mm max height |
When the EN pin is pulled low, the device shuts down and draws less than 1 pA.
Connect the FREQ pin to ground for 640 kHz, or to high/IN for 1.2 MHz.
The internal MOSFET limits the current to 4 A (guaranteed 3 A), with typical maximum output currents listed in Table 1 (e.g., 750 mA at 12 V).
It is offered in a 10‑lead thin dual‑flat‑no‑lead (TDFN) package with a maximum height of 0.8 mm.