Datasheet ADP1765 (Analog Devices)

5 A, Low VIN, Low Noise, CMOS Linear Regulator Data Sheet ADP1765 FEATURES TYPICAL APPLICATION CIRCUITS 5 A maximum output current ADP1765 V V IN = 1.8V OUT = 1.5V Low input voltage supply range VIN VOUT C C IN OUT VIN = 1.10 V to 1.98 V, no external bias supply required 22µF 22µF SENSE Fixed output voltage range (VOUT_FIXED): 0.55 V to 1.5 V RPULL-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: 5 nV/√Hz at 10 kHz; 4 nV/√Hz at 100 kHz CSS VREG REFCAP Low dropout voltage: 59 mV typical at 5 A load 10nF C C REG GND REF
001
1µF 1µF Operating supply current: 5 mA typical at no load
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±1.5% fixed output voltage accuracy over line, load, and
Figure 1. Fixed Output Operation
temperature ADP1765 Excellent power supply rejection ratio (PSRR) performance V V IN = 1.8V OUT = 1.5V VIN VOUT 61 dB typical at 10 kHz at 5 A load C C IN OUT 22µF 22µF 43 dB typical at 100 kHz at 5 A load SENSE RPULL-UP ON Excellent load/line transient response 100kΩ EN PG PG OFF Soft start to reduce inrush current SS VADJ Optimized for small 22 µF ceramic capacitors CSS VREG REFCAP R Current-limit and thermal overload protection ADJ 10nF C C 10kΩ REG GND REF
002
Power-good indicator 1µF 1µF
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Precision enable
Figure 2. Adjustable Output Operation
16-lead, 3 mm × 3 mm LFCSP package
The ADP1765 is available in fixed output voltages ranging from
APPLICATIONS
0.55 V to 1.5 V. The output voltage (VOUT) of the adjustable
Regulation to noise sensitive applications such as radio
output model can be set from 0.5 V to 1.5 V through an
frequency (RF) transceivers, analog-to-digital converter
external resistor connected between VADJ and ground.
(ADC) and digital-to-analog converter (DAC) circuits,
The ADP1765 has an externally programmable soft start time by
phase-locked loops (PLLs), voltage controlled oscillators
connecting a capacitor to the SS pin. Short-circuit and thermal
(VCOs) and clocking integrated circuits
overload protection circuits prevent damage in adverse conditions.
Field-programmable gate array (FPGA) and digital signal
The ADP1765 is available in a smal , 16-lead LFCSP package for
processor (DSP) supplies
the smal est footprint solution to meet a variety of applications.
Medical and healthcare Industrial and instrumentation Table 1. Related Devices Input Maximum Fixed/ GENERAL DESCRIPTION Model Voltage Current Adjustable Package
The ADP1765 is a low noise, low dropout (LDO) linear ADP1761 1.10 V to 1 A Fixed/ 16-lead regulator. It is designed to operate from a single input supply 1.98 V adjustable LFCSP with an input voltage as low as 1.10 V without the requirement ADP1762 1.10 V to 2 A Fixed/ 16-lead 1.98 V adjustable LFCSP of an external bias supply to increase efficiency and provide up ADP1763 1.10 V to 3 A Fixed/ 16-lead to 5 A of output current (IOUT). 1.98 V adjustable LFCSP The low 59 mV typical dropout voltage at a 5 A load allows the ADP1740/ 1.6 V to 2 A Fixed/ 16-lead ADP1765 to operate with a small headroom while maintaining ADP1741 3.6 V adjustable LFCSP regulation and providing better efficiency. ADP1752/ 1.6 V to 0.8 A Fixed/ 16-lead ADP1753 3.6 V adjustable LFCSP The ADP1765 is optimized for stable operation with small 22 µF ADP1754/ 1.6 V to 1.2 A Fixed/ 16-lead ceramic output capacitors. The ADP1765 delivers optimal transient ADP1755 3.6 V adjustable LFCSP performance with minimal printed circuit board (PCB) area.
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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 PARALLELING ADP1765 DEVICES FOR HIGH CURRENT APPLICATIONS THERMAL CONSIDERATIONS PCB LAYOUT CONSIDERATIONS OUTLINE DIMENSIONS ORDERING GUIDE