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MAX1644

Maxim
Part Number MAX1644
Manufacturer Maxim
Description Advanced Chemistry-Independent / Level 2 Battery Charger
Published May 6, 2005
Detailed Description 19-1457; Rev 3; 8/05 w The MAX1644 constant-off-time, PWM step-down DCDC converter is ideal for use in applications su...
Datasheet PDF File MAX1644 PDF File

MAX1644
MAX1644


Overview
19-1457; Rev 3; 8/05 w The MAX1644 constant-off-time, PWM step-down DCDC converter is ideal for use in applications such as PC cards, CPU daughter cards, and desktop computer bus-termination boards.
The device features internal synchronous rectification for high efficiency and reduced component count.
It requires no external Schottky diode.
The internal 0.
10Ω PMOS power switch and 0.
10Ω NMOS synchronous-rectifier switch easily deliver continuous load currents up to 2A.
The MAX1644 produces a preset +3.
3V or +2.
5V output voltage or an adjustable output from +1.
1V to VIN.
It achieves efficiencies as high as 95%.
w m o c .
2A, Low-Voltage, Step-Down Regulator with U 4 t Synchronous Rectification and Internal Switches e eGeneral Description h Features S a t a D .
w KIT ATION EVALU LE B A IL A AV MAX1644 ♦ ±1% Output Accuracy ♦ 95% Efficiency ♦ Internal PMOS and NMOS Switches 70mΩ On-Resistance at VIN = +4.
5V 100mΩ On-Resistance at VIN = +3V ♦ Output Voltage +3.
3V or +2.
5V Pin-Selectable +1.
1V to VIN Adjustable ♦ +3V to +5.
5V Input Voltage Range ♦ < 1µA Shutdown Supply Current The MAX1644 uses a unique current-mode, constantoff-time, PWM control scheme, which includes an Idle Mode™ to maintain high efficiency during light-load operation.
The programmable constant-off-time architecture sets switching frequencies up to 350kHz, allowing the user to optimize performance trade-offs between efficiency, output switching noise, component size, and cost.
The device also features an adjustable soft-start to limit surge currents during start-up, a 100% duty cycle mode for low-dropout operation, and a lowpower shutdown mode that disconnects the input from the output and reduces supply current below 1µA.
The MAX1644 is available in a 16-pin SSOP package.
♦ 360µA (max) Operating Supply Current ♦ Programmable Constant-Off-Time Operation ♦ 350kHz (max) Switching Frequency ♦ Idle Mode Operation at Light Loads ♦ Thermal Shutdown ♦ Adjustable Soft-Start Inrush Current Limiting ♦...


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