The MAX1953/MAX1954/MAX1957 is a family of versatile, economical, synchronous current-mode, pulse-width modulation (PWM) buck controllers. These step-down controllers are targeted for applications where cost and size are critical. The MAX1953 operates at a fixed 1MHz switching fre- quency, thus significantly reducing external component size and cost. Additionally, excellent transient response is obtained using less output capacitance. The MAX1953 operates from low 3V to 5.5V input voltage and can sup- ply up to 10A of output current. Selectable current limit is provided to tailor to the external MOSFETs’ on-resistance for optimum cost and performance. The output voltage is adjustable from 0.8V to 0.86VIN.
The MAX1953, MAX1954, and MAX1957 are a family of versatile, synchronous current‑mode PWM buck controllers aimed at cost‑sensitive, size‑critical applications. They operate from a 3 V to 5.5 V input range (MAX1954 up to 13.2 V) and deliver up to 10 A (MAX1953) or 25 A (MAX1954) of output current with efficiencies reaching 93 %.
The datasheet details absolute maximum ratings, electrical characteristics, typical operating curves, pin configurations, and package dimensions. It also describes the COMP pin for shutdown and compensation, internal digital soft‑start, and thermal protection features.
| Switching Frequency (MAX1953) | 1 MHz |
|---|---|
| Switching Frequency (MAX1954/MAX1957) | 300 kHz |
| Input Voltage Range | 3 V to 5.5 V |
| Input Voltage Range (MAX1954 high‑side) | 3 V to 13.2 V |
| Maximum Output Current (MAX1953) | 10 A |
| Maximum Output Current (MAX1954) | 25 A |
| Efficiency (MAX1954) | up to 93 % |
| Adjustable Output Voltage Range | 0.8 V to 0.86 V |
| Tracking Output Voltage Range (MAX1957) | 0.4 V to 0.86 V |
| Package Type | 10‑pin UMAX |
The MAX1953 operates at a fixed 1 MHz switching frequency.
The MAX1954 supports an input voltage range of 3 V to 13.2 V.
The MAX1954 can provide up to 25 A of output current.