Datasheet ADP1706, ADP1707, ADP1708 (Analog Devices)

1 A, Low Dropout, CMOS Linear Regulator Data Sheet ADP1706/ ADP1707/ ADP1708 FEATURES TYPICAL APPLICATION CIRCUITS Maximum output current: 1 A ADP1706 10nF Input voltage range: 2.5 V to 5.5 V 1 EN SS 8 Low shutdown current: <1 µA 2 GND SENSE 7 VOUT = 3.3V Low dropout voltage: 345 mV at 1 A load V 3 IN OUT 6 IN = 5V Initial accuracy: ±1% 4 IN OUT 5 4.7µF 4.7µF
001
Accuracy over line, load, and temperature: ±2.5%
06640-
16 fixed output voltage options with soft start
Figure 1. ADP1706 with Fixed Output Voltage, 3.3 V
0.75 V to 3.3 V (ADP1706) ADP1707 16 fixed output voltage options with tracking 1 EN TRK 8 VTRK 0.75 V to 3.3 V (ADP1707) 2 GND SENSE 7 Adjustable output voltage option V 3 IN OUT 6 VOUT IN = 5V 0.8 V to 5.0 V (ADP1708) 4 IN OUT 5 Stable with small 4.7 µF ceramic output capacitor 4.7µF 4.7µF VOUT (V) Excellent load/line transient response Current limit and thermal overload protection 3 2 Logic-controlled enable 1 Available in an 8-lead, exposed paddle SOIC and 0 1 2 3 4 5
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a 3 mm × 3 mm, 8-lead exposed paddle LFCSP VTRK (V)
06640- Figure 2. ADP1707 with Output Voltage Tracking
APPLICATIONS ADP1708 R2 Notebook computers 1 EN ADJ 8 Memory components R1 2 GND SENSE 7 Telecommunications equipment V 3 IN OUT 6 OUT = 0.8V(1 + R1/R2) VIN = 5V Network equipment 4 IN OUT 5
002
DSP/FPGA/microprocessor supplies 4.7µF 4.7µF Instrumentation equipment/data acquisition systems
06640- Figure 3. ADP1708 with Adjustable Output Voltage, 0.8 V to 5.0 V
GENERAL DESCRIPTION
The ADP1706/ADP1707/ADP1708 are CMOS, low dropout ADP1707 and ADP1708 contain internal soft start capacitors linear regulators that operate from 2.5 V to 5.5 V and provide that give a typical start-up time of 100 µs. The ADP1707 up to 1 A of output current. Using an advanced proprietary includes a tracking feature that allows the output to follow an architecture, they provide high power supply rejection and external voltage rail or reference. achieve excellent line and load transient response with a small The ADP1706/ADP1707/ADP1708 are available in an 8-lead, 4.7 µF ceramic output capacitor. exposed paddle SOIC package and an 8-lead, 3 mm × 3 mm The ADP1706/ADP1707 are available in 16 fixed output voltage exposed paddle LFCSP, making them not only very compact options. The ADP1708 is available in an adjustable version, solutions but also providing excellent thermal performance for which allows output voltages that range from 0.8 V to 5.0 V via applications requiring up to 1 A of output current in a small, an external divider. The ADP1706 al ows an external soft start low profile footprint. capacitor to be connected to program the start-up time; the
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Document Outline FEATURES APPLICATIONS TYPICAL APPLICATION CIRCUITS GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION SOFT START FUNCTION (ADP1706) ADJUSTABLE OUTPUT VOLTAGE (ADP1708) TRACK MODE (ADP1707) ENABLE FEATURE APPLICATIONS INFORMATION CAPACITOR SELECTION Output Capacitor Input Bypass Capacitor Input and Output Capacitor Properties VOLTAGE TRACKING APPLICATIONS CURRENT LIMIT AND THERMAL OVERLOAD PROTECTION THERMAL CONSIDERATIONS PCB LAYOUT CONSIDERATIONS OUTLINE DIMENSIONS ORDERING GUIDE NOTES