LP38842T-1.2/NOPB集成电路（IC）的线性+开关稳压器规格书PDF中文资料

LP38842T-1.2/NOPB属于集成电路（IC）的线性+开关稳压器。由美国德州仪器公司制造生产的LP38842T-1.2/NOPB稳压器 - 线性线性稳压器用于提供稳定的输出电压，无论负载电流、输入电压或环境因素如何变化，这些输出电压通常都要保持不变。它们的工作原理要求输入电压维持在高于所需的输出电压，而且要超出某个最小量，并且在工作时会将输入端的任何多余电压转换为热量。对于大多数应用而言，虽然这种稳压器的效率低于开关模式的稳压器，但它们通常更适合对噪声高度敏感的应用。

1FEATURES

2• Ideal for Conversion from 1.8V or 1.5V Inputs

• Designed for use with low ESR Ceramic

Capacitors

• 0.8V, 1.2V and 1.5V Standard Voltages

Available

• Ultra Low Dropout Voltage (115mV at 1.5A typ)

• 1.5% Initial Output Accuracy

• Load Regulation of 0.1%/A (typical)

• 30nA Quiescent Current in Shutdown (typical)

• Low Ground Pin Current at all Loads

• Over Temperature/Over Current Protection

• Available in 5 Lead TO-220 and DDPAK/TO-263

Packages

• −40°C to +125°C Junction Temperature Range

APPLICATIONS

• ASIC Power Supplies In:

– Desktops, Notebooks, and Graphics Cards,

Servers

– Gaming Set Top Boxes, Printers and

Copiers

• Server Core and I/O Supplies

• DSP and FPGA Power Supplies

• SMPS Post-Regulator

DESCRIPTION

The LP38842 is a high current, fast response

regulator which can maintain output voltage

regulation with minimum input to output voltage drop.

Fabricated on a CMOS process, the device operates

from two input voltages: Vbias provides voltage to

drive the gate of the N-MOS power transistor, while

Vin is the input voltage which supplies power to the

load. The use of an external bias rail allows the part

to operate from ultra low Vin voltages. Unlike bipolar

regulators, the CMOS architecture consumes

extremely low quiescent current at any output load

current. The use of an N-MOS power transistor

results in wide bandwidth, yet minimum external

capacitance is required to maintain loop stability.

The fast transient response of these devices makes

them suitable for use in powering DSP,

Microcontroller Core voltages and Switch Mode

Power Supply post regulators. The parts are available

in TO-220 and DDPAK/TO-263 packages.

Dropout Voltage: 115 mV (typ) at 1.5A load current.

Quiescent Current: 30 mA (typ) at full load.

Shutdown Current: 30 nA (typ) when S/D pin is low.

Precision Output Voltage: 1.5% room temperature

accuracy.