Datasheet ADP1761 (Analog Devices)

1 A, Low VIN, Low Noise, CMOS Linear Regulator Data Sheet ADP1761 FEATURES TYPICAL APPLICATION CIRCUITS 1 A maximum output current ADP1761 V V IN = 1.7V OUT = 1.5V Low input voltage supply range VIN VOUT C C IN OUT 10µF 10µF V SENSE IN = 1.10 V to 1.98 V, no external bias supply required R ON Fixed output voltage range: V PULL-UP OUT_FIXED = 0.9 V to 1.5 V 100kΩ EN PG PG OFF Adjustable output voltage range: VOUT_ADJ = 0.5 V to 1.5 V SS VADJ Ultralow noise: 2 μV rms, 100 Hz to 100 kHz CSS VREG REFCAP Noise spectral density 10nF C C REG GND REF
001
4 nV/√Hz at 10 kHz 1µF 1µF
19- 129
3 nV/√Hz at 100 kHz
Figure 1. Fixed Output Operation
Low dropout voltage: 30 mV typical at 1 A load ADP1761 Operating supply current: 4.5 mA typical at no load V V IN = 1.7V OUT = 1.5V VIN VOUT ±1.5% fixed output voltage accuracy over line, load, and C C IN OUT 10µF 10µF SENSE temperature RPULL-UP ON Excellent power supply rejection ratio (PSRR) performance 100kΩ EN PG PG OFF 67 dB typical at 10 kHz at 1 A load SS VADJ 51 dB typical at 100 kHz at 1 A load CSS VREG REFCAP RADJ 10nF Excellent load/line transient response C C 10kΩ REG GND REF
002
1µF 1µF Soft start to reduce inrush current
12919-
Optimized for small 10 μF ceramic capacitors
Figure 2. Adjustable Output Operation
Current-limit and thermal overload protection Table 1. Related Devices Power-good indicator Input Maximum Fixed/ Precision enable Device Voltage Current Adjustable Package 16-lead, 3 mm × 3 mm LFCSP package
ADP1762 1.10 V to 2 A Fixed/adjustable 16-lead
APPLICATIONS
1.98 V LFCSP ADP1763 1.10 V to 3 A Fixed/adjustable 16-lead
Regulation to noise sensitive applications such as radio
1.98 V LFCSP
frequency (RF) transceivers, analog-to-digital converter
ADP1740/ 1.6 V to 2 A Fixed/adjustable 16-lead
(ADC) and digital-to-analog converter (DAC) circuits,
ADP1741 3.6 V LFCSP
phase-locked loops (PLLs), voltage controlled oscillators
ADP1752/ 1.6 V to 0.8 A Fixed/adjustable 16-lead
(VCOs) and clocking integrated circuits
ADP1753 3.6 V LFCSP
Field-programmable gate array (FPGA) and digital signal
ADP1754/ 1.6 V to 1.2 A Fixed/adjustable 16-lead
processor (DSP) supplies
ADP1755 3.6 V LFCSP
Medical and healthcare Industrial and instrumentation GENERAL DESCRIPTION
The ADP1761 delivers optimal transient performance with The ADP1761 is a low noise, low dropout (LDO) linear regulator. minimal board area. It is designed to operate from a single input supply with an input The ADP1761 is available in fixed output voltages ranging from voltage as low as 1.10 V, without the requirement of an external 0.9 V to 1.5 V. The output of the adjustable output model can bias supply to increase efficiency and provide up to 1 A of be set from 0.5 V to 1.5 V through an external resistor connected output current. between VADJ and ground. The low 30 mV typical dropout voltage at a 1 A load allows the The ADP1761 has an externally programmable soft start time by ADP1761 to operate with a small headroom while maintaining connecting a capacitor to the SS pin. Short-circuit and thermal regulation and providing better efficiency. The ADP1761 is overload protection circuits prevent damage in adverse conditions. optimized for stable operation with small 10 μF ceramic output The ADP1761 is available in a small 16-lead LFCSP package for capacitors. the smallest footprint solution to meet a variety of applications.
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Document Outline Features Applications Typical Application Circuits General Description Revision History Specifications Input and Output Capacitor: Recommended Specifications Absolute Maximum Ratings Thermal Data Thermal Resistance/Parameter ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Theory of Operation Soft Start Function Adjustable Output Voltage Enable Feature Power-Good (PG) 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