Datasheet ADP1762 (Analog Devices)

2 A, Low VIN, Low Noise, CMOS Linear Regulator Data Sheet ADP1762 FEATURES TYPICAL APPLICATION CIRCUITS 2 A maximum output current ADP1762 V V IN = 1.7V OUT = 1.5V Low input voltage supply range VIN VOUT C C IN OUT V 10µF 10µF IN = 1.10 V to 1.98 V, no external bias supply required SENSE Fixed output voltage range: V R OUT_FIXED = 0.9 V to 1.5 V PULL-UP ON 100kΩ EN Adjustable output voltage range: V OFF OUT_ADJ = 0.5 V to 1.5 V PG PG Ultralow noise: 2 μV rms, 100 Hz to 100 kHz SS VADJ Noise spectral density CSS VREG REFCAP 10nF 4 nV/√Hz at 10 kHz C C
1
REG GND REF
00
1µF 1µF
22-
3 nV/√Hz at 100 kHz
129
Low dropout voltage: 62 mV typical at 2 A load
Figure 1. Fixed Output Operation
Operating supply current: 4.5 mA typical at no load ADP1762 ±1.5% fixed output voltage accuracy over line, load, and V V IN = 1.7V OUT = 1.5V VIN VOUT C C temperature IN OUT 10µF 10µF SENSE Excellent power supply rejection ratio (PSRR) performance RPULL-UP ON 62 dB typical at 10 kHz at 2 A load 100kΩ EN PG PG OFF 46 dB typical at 100 kHz at 2 A load SS VADJ Excellent load/line transient response CSS VREG REFCAP RADJ Soft start to reduce inrush current 10nF C C 10kΩ REG GND REF 1µF
002
Optimized for small 10 μF ceramic capacitors 1µF
922- 12
Current-limit and thermal overload protection
Figure 2. Adjustable Output Operation
Power-good indicator Precision enable Table 1. Related Devices 16-lead, 3 mm × 3 mm LFCSP package Input Maximum Fixed/ Device Voltage Current Adjustable Package APPLICATIONS
ADP1761 1.10 V to 1 A Fixed/adjustable 16-lead
Regulation to noise sensitive applications such as radio
1.98 V LFCSP
frequency (RF) transceivers, analog-to-digital converter
ADP1763 1.10 V to 3 A Fixed/adjustable 16-lead
(ADC) and digital-to-analog converter (DAC) circuits,
1.98 V LFCSP
phase-locked loops (PLLs), voltage controlled oscillators
ADP1740/ 1.6 V to 2 A Fixed/adjustable 16-lead ADP1741 3.6 V LFCSP
(VCOs) and clocking integrated circuits
ADP1752/ 1.6 V to 0.8 A Fixed/adjustable 16-lead
Field-programmable gate array (FPGA) and digital signal
ADP1753 3.6 V LFCSP
processor (DSP) supplies
ADP1754/ 1.6 V to 1.2 A Fixed/adjustable 16-lead
Medical and healthcare
ADP1755 3.6 V LFCSP
Industrial and instrumentation
The ADP1762 is optimized for stable operation with small 10 μF
GENERAL DESCRIPTION
ceramic output capacitors. The ADP1762 delivers optimal The ADP1762 is a low noise, low dropout (LDO) linear regulator. transient performance with minimal board area. It is designed to operate from a single input supply with an input The ADP1762 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 2 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 62 mV typical dropout voltage at a 2 A load allows the The ADP1762 has an externally programmable soft start time by ADP1762 to operate with a small headroom while maintaining connecting a capacitor to the SS pin. Short-circuit and thermal regulation and providing better efficiency. overload protection circuits prevent damage in adverse conditions. The ADP1762 is available in a small 16-lead LFCSP package for the smallest footprint solution to meet a variety of applications.
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Document Outline Features Applications General Description Typical Application Circuits 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