Datasheet ADP1754, ADP1755 (Analog Devices)

1.2 A, Low VIN, Low Dropout Linear Regulator Data Sheet ADP1754/ ADP1755 FEATURES TYPICAL APPLICATION CIRCUITS Maximum output current: 1.2 A VIN = 1.8V VOUT = 1.5V Input voltage range: 1.6 V to 3.6 V 4.7µF 4.7µF Low shutdown current: <2 µA 16 15 14 13 Very low dropout voltage: 105 mV at 1.2 A load VIN VIN VOUT VOUT Initial accuracy: ±1% 1 VIN VOUT 12 Accuracy over line, load, and temperature: ±2% 2 VIN 100kΩ ADP1754 VOUT 11 7 fixed output voltage options with soft start TOP VIEW 0.75 V to 2.5 V (ADP1754) 3 VIN (Not to Scale) VOUT 10 Adjustable output voltage option with soft start PG 4 EN SENSE 9 0.75 V to 3.3 V (ADP1755) PG GND SS NC High PSRR 5 6 7 8 65 dB at 1 kHz 10nF
001
65 dB at 10 kHz
07722-
54 dB at 100 kHz
Figure 1. ADP1754 with Fixed Output Voltage, 1.5 V
23 μV rms at 0.75 V output V Stable with small 4.7 µF ceramic output capacitor IN = 1.8V VOUT = 0.5V(1 + R1/R2) Excellent load and line transient response 4.7µF 4.7µF Current-limit and thermal overload protection 16 15 14 13 VIN VIN VOUT VOUT Power-good indicator 1 VIN VOUT 12 Logic-controlled enable Reverse current protection 2 VIN 100kΩ ADP1755 VOUT 11 TOP VIEW APPLICATIONS 3 VIN (Not to Scale) VOUT 10 R1 PG Server computers 4 EN ADJ 9 Memory components PG GND SS NC R2 5 6 7 8 Telecommunications equipment Network equipment 10nF
002
DSP/FPGA/microprocessor supplies
07722-
Instrumentation equipment/data acquisition systems
Figure 2. ADP1755 with Adjustable Output Voltage, 0.75 V to 3.3 V
GENERAL DESCRIPTION
The ADP1754/ADP1755 are low dropout (LDO) CMOS linear voltages that range from 0.75 V to 3.3 V via an external divider. regulators that operate from 1.6 V to 3.6 V and provide up to The ADP1754/ADP1755 allow an external soft start capacitor 1.2 A of output current. These low VIN/VOUT LDOs are ideal for to be connected to program the startup. A digital power-good regulation of nanometer FPGA geometries operating from 2.5 V output allows power system monitors to check the health of the down to 1.8 V I/O rails, and for powering core voltages down to output voltage. 0.75 V. Using an advanced proprietary architecture, the ADP1754/ The ADP1754/ADP1755 are available in a 16-lead, 4 mm × 4 mm ADP1755 provide high power supply rejection ratio (PSRR) and LFCSP, making them not only very compact solutions, but also low noise, and achieve excellent line and load transient response providing excellent thermal performance for applications that with only a small 4.7 µF ceramic output capacitor. require up to 1.2 A of output current in a small, low profile The ADP1754 is available in seven fixed output voltage options. footprint. The ADP1755 is the adjustable version, which allows output
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Document Outline Features Applications Typical Application Circuits General Description Table of Contents Revision History Specifications Input and Output Capacitor, Recommended Specifications Absolute Maximum Ratings Thermal Data Thermal Resistance ESD Caution Pin Configurations and Function Descriptions Typical Performance Characteristics Theory of Operation Soft Start Function (ADP1754/ADP1755) Adjustable Output Voltage (ADP1755) Enable Feature Power-Good Feature Reverse Current Protection Feature Applications Information Capacitor Selection Output Capacitor Input Bypass Capacitor Input and Output Capacitor Properties Undervoltage Lockout Current-Limit and Thermal Overload Protection Thermal Considerations PCB Layout Considerations Outline Dimensions Ordering Guide