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MAX8869EUE33 Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX8869EUE33 Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 11 page MAX8869 1A, Microcap, Low-Dropout, Linear Regulator 6 Maxim Integrated Detailed Description The MAX8869 features Dual Mode operation, allowing a fixed output of +5V, +3.3V, +2.5V, +1.8V, or +1.0V, or adjustable output from +0.8V to +5.0V. The regulators are guaranteed to supply 1A of continuous output cur- rent with only 1µF of output capacitance. As shown in the functional diagram (Figure 1), the device has a 0.8V reference, error amplifier, MOSFET driver, P-channel pass transistor, internal feedback voltage-divider, soft-start function, reset timer, and Dual Mode and low VOUT comparators. The 0.8V reference is connected to the error amplifier’s inverting input. The error amplifier compares this refer- ence with the selected feedback voltage and amplifies the difference. The MOSFET driver reads the error sig- nal and applies the appropriate drive to the P-channel transistor. If the feedback voltage is high, the pass tran- sistor’s gate is pulled up, allowing less current to pass to the output. The low VOUT comparator senses when the feedback voltage has dropped 8% below its expected level, causing RST to go low. The output voltage is fed back through either an inter- nal resistor-divider connected to OUT or an external resistor network connected to SET. The Dual Mode comparator examines VSET and selects the feedback path. If VSET is below 80mV, the internal feedback path is used and the output voltage is regulated to the facto- ry-preset voltage. Otherwise, the output voltage is set with the external resistor-divider. Internal P-Channel Pass Transistor The MAX8869 features a 1A P-channel MOSFET pass transistor. Unlike similar designs using PNP pass tran- sistors, P-channel MOSFETs require no base drive, which reduces quiescent current. PNP-based regula- tors also waste considerable current in dropout when the pass transistor saturates and use high base-drive currents under large loads. The MAX8869 does not suf- fer from these problems and consumes only 500µA of quiescent current even in dropout. Pin Description PIN NAME FUNCTION 1, 9, 16 N.C. No Connection. Not internally connected. 2, 3, 4, 5 IN Regulator Input. Connect to power source (+2.7V to +5.5V). Bypass with 1 µF or greater capacitor to GND (see Capacitor Selection and Regulator Stability). Connect all IN inputs together for proper operation. 6 RST Reset Output. Open-drain output is low when VOUT is 8% below its nominal value. RST remains low while the output voltage (VOUT) is below the reset threshold and for at least 3ms after VOUT rises to within regulation. Connect a 100k Ω pullup resistor to OUT to obtain an output voltage. 7 SHDN Active-Low Shutdown Input. A logic low reduces the supply current to 0.1 µA. Connect SHDN to IN for normal operation. In shutdown, RST is low and the soft-start capacitor discharges. 8SS Soft-Start Control. Connect a soft-start capacitor from SS to GND (see Soft-Start Capacitor Selection). Leave SS open to disable soft-start. 10 GND Ground. Solder both GND and EP to a large pad or to the circuit-board ground plane to maximize power dissipation. 11 SET Voltage-Setting Input. Connect SET to GND for factory-preset output voltage. Connect SET to an external resistor-divider for adjustable output operation. 12, 13, 14, 15 OUT Regulator Output. Bypass with a 1 µF or greater low-ESR capacitor to GND (see Capacitor Selection and Regulator Stability). Connect all OUT outputs together for proper operation. —EP Exposed Pad. Connect to a large ground plane to maximize thermal performance. Not intended as an electrical connection point. |
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