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MAX1901EAI Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX1901EAI Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 33 page 500kHz Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers _______________________________________________________________________________________ 9 Pin Description PIN SSOP QFN NAME FUNCTION 1 29 CSH3 Current-Sense Input for the 3.3V SMPS. Current-limit level is 100mV referred to CSL3. 2 30 CSL3 Current-Sense Input. Also serves as the feedback input in fixed-output mode. 3 31 FB3 Feedback Input for the 3.3V SMPS. Regulates at FB3 = REF (approx. 2.5V) in adjustable mode. FB3 is a dual-mode input that also selects the 3.3V fixed output voltage setting when connected to GND. Connect FB3 to a resistor-divider for adjustable-output mode. 12OUT (MAX1902) 12V/120mA Linear-Regulator Output. Input supply comes from VDD. Bypass 12OUT to GND with 1µF (min). 41 STEER (MAX1901/ MAX1904) Logic-Control Input for Secondary Feedback. Selects the PWM that uses a transformer and secondary feedback signal (SECFB): STEER = GND: 3.3V SMPS uses transformer STEER = VL: 5V SMPS uses transformer VDD (MAX1902) Supply Voltage Input for the 12OUT Linear Regulator. Also connects to an internal resistor-divider for secondary winding feedback and to an 18V overvoltage shunt regulator clamp. 52 SECFB (MAX1901/ MAX1904) Secondary Winding Feedback Input. Normally connected to a resistor-divider from an auxiliary output. SECFB regulates at VSECFB = 2.5V (see the Secondary Feedback Regulation Loop section). Connect to VL if not used. 6 3 SYNC Oscillator Synchronization and Frequency Select. Connect to VL for 500kHz operation; connect to GND for 333kHz operation. Can be driven at 400kHz to 583kHz for external synchronization. 7 4 TIME/ON5 Dual-Purpose Timing Capacitor Pin and ON/ OFF Control Input. See the Power-Up Sequencing and ON/ OFF Controls section. 8 5 GND Low-Noise Analog Ground and Feedback Reference Point 9 7 REF 2.5V Reference Voltage Output. Bypass to GND with 1µF (min). 10 8 SKIP Logic-control input that disables idle mode when high. Connect to GND for normal use. 11 9 RESET Active-Low Timed Reset Output. RESET swings GND to VL. Goes high after a fixed 32,000 clock-cycle delay following power-up. 12 10 FB5 Feedback Input for the 5V SMPS. Regulates at FB5 = REF (approx. 2.5V) in adjustable mode. FB5 is a dual-mode input that also selects the 5V fixed output voltage setting when connected to GND. Connect FB5 to a resistor-divider for adjustable-output mode. 13 11 CSL5 Current-Sense Input for the 5V SMPS. Also serves as the feedback input in fixed-output mode, and as the bootstrap supply input when the voltage on CSL5/VL is > 4.5V. 14 12 CSH5 Current-Sense Input for the 5V SMPS. Current-limit level is 100mV referred to CSL5. |
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