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MAX8528 Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX8528 Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 10 page 1.425V to 3.6V Input, 2A, 0.2V Dropout LDO Regulators _______________________________________________________________________________________ 7 Detailed Description The MAX8526/MAX8527/MAX8528 are low-input, low- dropout, PMOS regulators capable of delivering up to 2A of output current with as little as 200mV of head- room from input to output. The PMOS output stage can be driven from input voltages down to +1.425V without sacrificing stability or transient performance. Since this regulator has a PMOS output device, supply current is not a significant function of load or input headroom. Internal p-Channel Pass Transistor The MAX8526/MAX8527/MAX8528 feature a 50m Ω (typ) p-channel MOSFET pass transistor. Unlike similar designs using pnp pass transistors, p-channel MOSFETs require no base drive, which reduces quiescent current. pnp-based regulators also waste considerable current in dropout when the pass transistor saturates, and use high base-drive currents under large loads. The MAX8526/ MAX8527/MAX8528 do not suffer from these problems and consume only 500µA (typ) of quiescent current under heavy loads, as well as in dropout. Short-Circuit/Thermal Fault Protection The MAX8526/MAX8527/MAX8528 are fully protected from a short circuit at the output through current-limit- ing and thermal-overload circuitry. In the fault condition when the output is shorted to ground, the output cur- rent is limited to 4A. Under these conditions, the part quickly heats up. When the junction temperature reach- es +165°C, the thermal-overload circuitry turns off the output, allowing the part to cool down. When the junc- tion temperature cools to +150°C, the output turns back on and tries to reestablish regulation. Current limiting and thermal protection continue until the fault is removed. For continuous operation, do not exceed the absolute maximum junction temperature rating of TJ = +150°C. Output Voltage Selection The MAX8526/MAX8527/MAX8528 feature an adjustable output voltage from 0.5V to 3.4V, using two external resistors connected as a voltage-divider to FB as shown in Figure 1. The output voltage is set by the following equation: where typically VFB = 0.5V. Choose R2 < 5kΩ to opti- mize quiescent current, accuracy, and high-frequency power-supply rejection. To simplify resistor selection: Soft-Start Inherent soft-start limits inrush current. Peak inrush cur- rent is dependent on the value of COUT and can be calculated as follows: Shutdown Mode The MAX8526/MAX8527/MAX8528 include an enable input. To shut down the device, pull EN to GND. For normal operation, connect the EN to IN. During shut- down, an internal 10k Ω resistor pulls down the output. Power-OK (POK, MAX8527 Only) The MAX8527 features a power-OK output to indicate the status of the output. POK remains high when the regulator output is within ±10% of its nominal output voltage. If the output voltage falls/rises outside this range, POK transitions low. This open-drain output requires an external pullup resistor to IN. An internal delay circuit prevents the POK from switching for 50µs (typ) after the trip threshold is initially reached. If the part is in shutdown mode, POK is low. Power-On Reset (POR, MAX8528 Only) The MAX8528 features a power-on reset output that transitions high 150ms (typ) after the output has risen above 90% of its final value. This open-drain output requires an external pullup resistor to IN. If the part is in shutdown mode, falls below 90% of the nominal output voltage, or experiences a short-circuit/thermal fault, POR immediately transitions low. II CF INRUSH LOAD OUT =+ () ⎛ ⎝ ⎜ ⎞ ⎠ ⎟ µ 66 RR V V OUT FB 12 = ⎛ ⎝⎜ ⎞ ⎠⎟ -1 VV R R OUT FB =+ ⎛ ⎝⎜ ⎞ ⎠⎟ 1 1 2 MAX8526 MAX8527 MAX8528 2.2 µF 10 µF ENABLE SHUTDOWN IN IN POK (MAX8527) OR POR (MAX8528) EN IN IN OUT OUT GND FB OUT OUT 100k Ω* R1 R2 ADJUSTABLE OUTPUT *FOR MAX8527 AND MAX8528 +1.425V TO +3.6V Figure 1. Typical Application Circuit |
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Similar Description - MAX8528 |
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