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ISL9021IRURZ-T Datasheet(PDF) 8 Page - Intersil Corporation |
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ISL9021IRURZ-T Datasheet(HTML) 8 Page - Intersil Corporation |
8 / 10 page 8 FN6867.2 January 14, 2010 Functional Description The ISL9021 is a high performance low-dropout regulator (LDO) with 250mA sourcing capability. The extra low ground current makes this part a good choice for handheld product applications. The device also incorporates overcurrent, thermal shutdown, reverse current protections, and soft-start features. Thermal shutdown protects the device against overheating. Soft-start limits the start-up input current surges. In some applications, the output voltage may be externally pulled higher than input, or the input voltage could be connected to ground, or connected to some voltage lower than the output side. The ISL9021 features reverse current protection; that can block the reverse current from output to input. Enable Control The ISL9021 has an enable pin. When EN is low, the IC is in shutdown mode. In this condition, all on-chip circuits are off, and the device draws minimum current, typically less than 0.1µA(typ). Driving this pin high will turn on the device. LDO Protections The ISL9021 offers several protection functions, making it ideal for use in battery-powered applications.The ISL9021 provides short-circuit protection by limiting the output current at current limit of 260mA(min). If the short circuit lasts long enough, the die temperature increases, and the over-temperature protection circuit will shut down the output. When the die temperature reaches about +145°C, thermal protection starts to work with output being loaded with at least 50mA. Once the die temperature drops to about +110°C, the LDO will resume operation beginning with a soft-start. The ISL9021’s reverse current protection is intended to block reverse conduction if output voltage is higher than input voltage. Input and Output Capacitors The ISL9021 provides a linear regulator that has low quiescent current, fast transient response, and overall stable operation across the recommended operating conditions. A ceramic capacitor (X5R or X7R) with a capacitance of 1µF to 4.7µF with an ESR up to 400m Ω is suitable for the ISL9021 to maintain its output stability. The ground connection of the output capacitor should be routed directly to the GND pin of the device, and also placed close to the IC. Similarly for the input capacitor, usually a 1µF ceramic capacitor (X5R or 7R) is suitable for most cases, but if a large, fast rising load transient condition is expected, a higher value input capacitor may be necessary to achieve satisfactory performance. Board Layout Recommendations A good PCB layout is an important step to achieve good performance. It is recommended to design the board with separate ground planes for input and output, and connect both ground planes at the GND pin of the IC. Consideration should be taken when placing the components and routing the trace to minimize the ground impedance, and keep the parasitic inductance low. Usually the input/output capacitors should be placed as close to the IC as possible with a good ground connection. ISL9021 |
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