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3.6A, 1.4MHz, LOW-VOLTAGE, INTERNAL SWITCH STEP-DOWN REGULATOR WITH DYNAMIC OUTPUT-VOLTAGE CONTROL
SUNNYVALE, CA-January 24, 2003-Maxim Integrated Products
(NASDAQ: MXIM) introduces the MAX1536, 3.6A internal switch, step-down DC-DC converter. This device is ideal for 5V and 3.3V to low-voltage conversion in notebooks, subnotebooks, and desk notes.
The MAX1536 features an internal PMOS power switch and synchronous rectification for high efficiency and reduced component count. The internal 54m PMOS power switch and 47m NMOS synchronous-rectifier switch easily deliver continuous load currents up to 3.6A. This device produces an adjustable output from 0.7V to VIN and achieves efficiencies as high as 96%.
The MAX1536 uses a unique current-mode, constant off-time, PWM control scheme. It has a selectable idle mode to maintain high efficiency during light-load operation, or fixed PWM-mode for low output ripple. The programmable constant-off-time architecture allows for a wide range of switching frequencies up to 1.4MHz. This optimizes performance trade-offs between efficiency, output switching noise, component size, and cost. The
MAX1536 features a digital soft-start to limit surge current during startup, a 100% duty-cycle mode for low-dropout operation, and a low-power shutdown mode to disconnect the input from the output and reduce supply current below 1µA.
The MAX1536 is available in a 28-pin thin QFN package. Prices start at $4.69 (1000-up, FOB USA). A preassembled evaluation kit with recommended external components is available to speed design.
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