Datasheet ADP1764 (Analog Devices)

4 A, Low VIN, Low Noise, CMOS Linear Regulator Data Sheet ADP1764 FEATURES TYPICAL APPLICATION CIRCUITS 4 A maximum output current ADP1764 V V IN = 1.8V OUT = 1.5V Low input voltage supply range VIN VOUT C C IN OUT V 22µF 22µF IN = 1.10 V to 1.98 V, no external bias supply required SENSE Fixed output voltage range (V R ON OUT_FIXED): 0.55 V to 1.5 V PULL-UP 100kΩ EN Adjustable output voltage range (V PG PG OFF OUT_ADJ): 0.5 V to 1.5 V 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 10nF Low dropout voltage: 47 mV typical at 4 A load C C REG GND REF
01 0
1µF 1µF
9-
Operating supply current: 5 mA typical at no load
93 14
±1.5% fixed output voltage accuracy over line, load, and
Figure 1. Fixed Output Operation
temperature ADP1764 V V Excellent power supply rejection ratio (PSRR) performance IN = 1.8V OUT = 1.5V VIN VOUT C C 69 dB typical at 10 kHz at 4 A load IN OUT 22µF 22µF SENSE 46 dB typical at 100 kHz at 4 A load 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 C R SS VREG REFCAP ADJ Current-limit and thermal overload protection 10nF 10kΩ C C
2
REG GND REF
00
Power-good indicator 1µF 1µF
9- 493 1
Precision enable
Figure 2. Adjustable Output Operation
16-lead, 3 mm × 3 mm LFCSP package
The ADP1764 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 ADP1764 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 ADP1764 is available in a small, 16-lead LFCSP package for
processor (DSP) supplies
the smallest 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 ADP1764 is a low noise, low dropout (LDO) linear ADP1761 1.10 V to 1.98 V 1 A Fixed/ 16-lead adjustable LFCSP regulator. It is designed to operate from a single input supply ADP1762 1.10 V to 1.98 V 2 A Fixed/ 16-lead with an input voltage as low as 1.10 V without the requirement adjustable LFCSP of an external bias supply to increase efficiency and provide up ADP1763 1.10 V to 1.98 V 3 A Fixed/ 16-lead to 4 A of output current (IOUT). adjustable LFCSP The low 47 mV typical dropout voltage at a 4 A load allows the ADP1740/ 1.6 V to 3.6 V 2 A Fixed/ 16-lead ADP1741 adjustable LFCSP ADP1764 to operate with a small headroom while maintaining ADP1752/ 1.6 V to 3.6 V 0.8 A Fixed/ 16-lead regulation and providing better efficiency. ADP1753 adjustable LFCSP The ADP1764 is optimized for stable operation with small 22 μF ADP1754/ 1.6 V to 3.6 V 1.2 A Fixed/ 16-lead ADP1755 adjustable LFCSP ceramic output capacitors. The ADP1764 delivers optimal transient 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 ADP1764 DEVICES FOR HIGH CURRENT APPLICATIONS THERMAL CONSIDERATIONS PCB LAYOUT CONSIDERATIONS OUTLINE DIMENSIONS ORDERING GUIDE