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MAX1706C Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX1706C Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 20 page 1- to 3-Cell, High-Current, Low-Noise, Step-Up DC-DC Converters with Linear Regulator _______________________________________________________________________________________ 9 ______________________________________________________________Pin Description Boost DC-DC Converter Power Output. POUT is the source of the P-channel synchronous-rectifier MOSFET switch. Connect an external Schottky diode from LX to POUT. The output current available from POUT is reduced by the current drawn from the LDO linear-regulator output. POUT 16 On Control Input. When ONA = high or ONB = low, the IC turns on. Connect ONA to OUT for normal operation (Table 2). ONA 15 Off Control Input. When ONB = high and ONA = low, the IC is off. Connect ONB to GND for normal operation (Table 2). ONB 14 Inductor connection to the drains of the P-channel synchronous rectifier and N-channel switch LX 13 Power Ground for the source of the N-channel power MOSFET switch PGND 12 Low-Dropout Linear-Regulator Output. LDO sources up to 200mA. Bypass to GND with a 22µF capacitor. LDO 9 Low-Battery Comparator Output. This open-drain, N-channel output is low when LBP < LBN. Input hysteresis is 16mV. LBO 10 Switching-Mode Selection and External-Clock Synchronization Input: • CLK/SEL = low: low-power, low-quiescent-current PFM mode. • CLK/SEL = high: low-noise, high-power PWM mode. Switches at a constant frequency (300kHz). Full output power is available. • CLK/SEL = driven with an external clock: low-noise, high-power synchronized PWM mode. Synchronizes to an external clock (from 200kHz to 400kHz). Turning on the DC-DC converter with CLK/SEL = GND also serves as a soft-start function, since peak inductor current is reduced. CLK/SEL 11 Ground GND 5 Step-Up Converter Feedback Input, used during track mode. IC power and low-dropout linear-regulator input. Bypass OUT to GND with a 0.1µF ceramic capacitor placed as close to the IC as possible. OUT 6 Step-Up DC-DC Converter Feedback Input. Connect FB to a resistor voltage divider between POUT and GND to set the output voltage between 2.5V and 5.5V. FB regulates to 1.233V. FB 7 Low-Dropout Linear-Regulator Feedback Input. Connect FBLDO to a resistor voltage divider between LDO to GND to set the output voltage from 1.25V to VOUT - 0.3V (5.0V max). FBLDO regulates to 1.250V. FBLDO 8 Track-Mode Control Input for DC-DC Converter. In track mode, the boost-converter output is sensed at OUT and set 0.3V above LDO to improve efficiency. Set TRACK to OUT for track mode. Connect TRACK to GND for normal operation. TRACK 4 1.250V Reference Output. Bypass REF with a 0.33µF capacitor to GND. REF can source up to 50µA. REF 3 PIN Low-Battery Comparator Inverting Input. Common-mode range is 0.5V to 1.5V. LBN 2 Low-Battery Comparator Noninverting Input. Common-mode range is 0.5V to 1.5V. LBP 1 FUNCTION NAME |
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