Datasheet

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50 mA, High Voltage,

Micropower Linear Regulator

ADP1720

Rev. A

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FEATURES

Wide input voltage range: 4 V to 28 V

Maximum output current: 50 mA

Low light load current:

28 μA at 0 μA load

35 μA at 100 μA load

Low shutdown current: 0.7 μA

Low dropout voltage: 275 mV @ 50 mA load

Initial accuracy: ±0.5%

Accuracy over line, load, and temperature: ±2%

Stable with small 1μF ceramic output capacitor

Fixed 3.3 V and 5.0 V output voltage options

Adjustable output voltage option: 1.225 V to 5.0 V

Current limit and thermal overload protection

Logic controlled enable

Space-saving thermally enhanced MSOP package

APPLICATIONS

DC-to-DC post regulation

PCMCIA regulation

Keep-alive power in portable equipment

Industrial applications

TYPICAL APPLICATION CIRCUITS

GND

1 8

GND

OUT

ADP1720

FIXED

= 28V

OUT

= 5V

1µF

06111-001

Figure 1. ADP1720 with Fixed Output Voltage, 5.0 V

GND

ADJ

OUT

ADP1720

ADJUSTABLE

= 12V

OUT

1.225V(1 + R1/R2)

1µF

06111-002

Figure 2. ADP1720 with Adjustable Output Voltage, 1.225 V to 5.0 V

GENERAL DESCRIPTION

The ADP1720 is a high voltage, micropower, low dropout linear

regulator. Operating over a very wide input voltage range of 4 V

to 28 V, the ADP1720 can provide up to 50 mA of output current.

With just 28 μA of quiescent supply current and a micropower

shutdown mode, this device is ideal for applications that require

low quiescent current.

The ADP1720 is available in fixed output voltages of 3.3 V and

5.0 V. An adjustable version is also available, which allows the

output to be set anywhere between 1.225 V and 5.0 V. An enable

function that allows external circuits to turn on and turn off the

ADP1720 output is available. For automatic startup, the enable

(EN) pin can be connected directly to the input rail.

The ADP1720 is optimized for stable operation with small 1 μF

ceramic output capacitors, allowing for good transient perform-

ance while occupying minimal board space.

The ADP1720 operates from –40°C to +125°C and uses current

limit protection and thermal overload protection circuits to

prevent damage to the device in adverse conditions.

Available in a small thermally enhanced MSOP package, the

ADP1720 provides a compact solution with low thermal resistance.

Summary of content (16 pages)

PAGE 1
50 mA, High Voltage, Micropower Linear Regulator ADP1720 APPLICATIONS TYPICAL APPLICATION CIRCUITS ADP1720 FIXED VIN = 28V 1µF 1 GND GND 8 2 IN GND 7 3 OUT GND 6 4 EN GND 5 VOUT = 5V 06111-001 Wide input voltage range: 4 V to 28 V Maximum output current: 50 mA Low light load current: 28 μA at 0 μA load 35 μA at 100 μA load Low shutdown current: 0.7 μA Low dropout voltage: 275 mV @ 50 mA load Initial accuracy: ±0.
PAGE 2
ADP1720 TABLE OF CONTENTS Features .............................................................................................. 1 Typical Performance Characteristics ..............................................7 Applications ....................................................................................... 1 Theory of Operation ...................................................................... 10 Typical Application Circuits............................................................
PAGE 3
ADP1720 SPECIFICATIONS VIN = 12 V, IOUT = 100 μA, CIN = COUT = 1 μF, TA = 25°C, unless otherwise noted. Table 1.
PAGE 4
ADP1720 Parameter POWER SUPPLY REJECTION RATIO Symbol PSRR Conditions f = 120 Hz, VIN = 8 V, VOUT = 1.6 V f = 1 kHz, VIN = 8 V, VOUT = 1.6 V f = 10 kHz, VIN = 8 V, VOUT = 1.6 V f = 120 Hz, VIN = 8 V, VOUT = 5 V f = 1 kHz, VIN = 8 V, VOUT = 5 V f = 10 kHz, VIN = 8 V, VOUT = 5 V 1 Min Typ –90 –80 –60 –83 –70 –50 Max Unit dB dB dB dB dB dB Accuracy when OUT is connected directly to ADJ.
PAGE 5
ADP1720 ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE Table 2. Parameter IN to GND OUT to GND EN to GND ADJ to GND Storage Temperature Range Operating Junction Temperature Range Soldering Conditions Rating –0.3 V to +30 V –0.3 V to IN or +6 V (whichever is less) –0.3 V to +30 V –0.3 V to +6 V –65°C to +150°C –40°C to +125°C θJA is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages. Table 3.
PAGE 6
ADP1720 IN 2 OUT 3 EN 4 ADP1720 FIXED TOP VIEW (Not to Scale) 8 GND ADJ 1 7 GND IN 2 6 GND OUT 3 5 GND 06111-003 GND 1 EN 4 Figure 3. 8-Lead MSOP ADP1720 ADJUSTABLE TOP VIEW (Not to Scale) 8 GND 7 GND 6 GND 5 GND 06111-004 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS Figure 4. 8-Lead MSOP Table 4. Pin Function Descriptions ADP1720 Fixed Pin No. 1 N/A 2 3 4 ADP1720 Adjustable Pin No.
PAGE 7
ADP1720 TYPICAL PERFORMANCE CHARACTERISTICS VIN = 12 V, VOUT = 5 V, IOUT = 100 μA, CIN = COUT = 1 μF, TA = 25°C, unless otherwise noted. 1200 5.03 5.02 1000 ILOAD = 50mA ILOAD = 25mA ILOAD = 10mA 5.01 IGND (µA) 5.00 4.99 200 4.96 –40 –5 600 25 85 06111-008 4.97 ILOAD = 1mA ILOAD = 100µA ILOAD = 10µA 400 ILOAD = 10µA ILOAD = 100µA ILOAD = 1mA ILOAD = 10mA ILOAD = 25mA ILOAD = 50mA 4.98 06111-005 VOUT (V) 800 0 –40 125 –5 25 85 125 TJ (°C) TJ (°C) Figure 5. Output Voltage vs.
PAGE 8
ADP1720 3.5 300 3.0 250 ILOAD = 50mA 200 IGND (mA) VDROPOUT (mV) 2.5 150 2.0 ILOAD = 25mA 1.5 100 ILOAD = 10mA 1.0 06111-011 0.5 0 1 0 4.9 100 10 ILOAD = 1mA 06111-013 50 5.0 5.1 Figure 11. Dropout Voltage vs. Load Current 5.3 5.4 Figure 13. Ground Current vs. Input Voltage (in Dropout) 5.05 0 ILOAD = 1mA 5.00 –10 4.95 –20 VIN = 8V VOUT = 1.6V COUT = 1µF VRIPPLE = 50mV –30 4.90 1mA PSRR (dB) ILOAD = 50mA 4.85 ILOAD = 25mA 4.
PAGE 9
ADP1720 0 VIN = 8V VOUT = 5V COUT = 1µF VRIPPLE = 50mV –10 –20 VIN STEP FROM 6V TO 7V –30 VOUT = 5V CIN = 1µF COUT = 1µF ILOAD = 50mA 10mA –50 –60 100µA 2V/DIV 1mA 1 10mV/DIV 2 –70 –90 –100 10 100 1k 10k 100k 1M VOUT 06111-017 06111-015 –80 10M TIME (100µs/DIV) FREQUENCY (Hz) Figure 15. Power Supply Rejection Ratio vs. Frequency (5.0 V Fixed Output) Figure 17. Line Transient Response 5V/DIV EN 1 VOUT 1 2V/DIV VOUT 06111-016 10mV/DIV VIN = 12V VOUT = 1.
PAGE 10
ADP1720 THEORY OF OPERATION The ADP1720 is a low dropout, BiCDMOS linear regulator that operates from a 4 V to 28 V input rail and provides up to 50 mA of output current. Ground current in shutdown mode is typically 700 nA. The ADP1720 is stable and provides high power supply rejection ratio (PSRR) and excellent line and load transient response with just a small 1 μF ceramic output capacitor.
PAGE 11
ADP1720 APPLICATIONS INFORMATION CAPACITOR SELECTION Input and Output Capacitor Properties Output Capacitor Any good quality ceramic capacitors can be used with the ADP1720, as long as they meet the minimum capacitance and maximum ESR requirements. Ceramic capacitors are manufactured with a variety of dielectrics, each with different behavior over temperature and applied voltage.
PAGE 12
ADP1720 THERMAL CONSIDERATIONS 140 MAX TJ (DO NOT OPERATE ABOVE THIS POINT) 120 100 TJ (°C) 80 60 40 20 1mA 5mA 10mA 20mA 0 4 8 Table 5. 12 16 20 24 28 VIN – VOUT (V) θJA (°C/W) 118 99 77 75 74 Figure 22. 300 mm2 of PCB Copper, TA = 25°C 140 MAX TJ (DO NOT OPERATE ABOVE THIS POINT) 120 100 Device soldered to minimum size pin traces.
PAGE 13
ADP1720 140 140 MAX TJ (DO NOT OPERATE ABOVE THIS POINT) 120 120 100 100 80 80 TJ (°C) 60 40 40 1mA 5mA 10mA 20mA 30mA 40mA 50mA (LOAD CURRENT) 0 0 4 8 12 16 20 24 20 06111-025 20 1mA 5mA 28 0 MAX TJ (DO NOT OPERATE ABOVE THIS POINT) 120 100 80 60 20 50mA (LOAD CURRENT) 0 0 4 8 12 16 20 24 06111-026 40 30mA 40mA 50mA (LOAD CURRENT) 4 8 12 16 20 Figure 27. 0 mm2 of PCB Copper, TA = 50°C 140 10mA 20mA 30mA 40mA VIN – VOUT (V) Figure 25.
PAGE 14
ADP1720 PRINTED CIRCUIT BOARD LAYOUT CONSIDERATIONS GND (TOP) Place the input capacitor as close as possible to the IN and GND pins. Place the output capacitor as close as possible to the OUT and GND pins. Use of 0402 or 0603 size capacitors and resistors achieves the smallest possible footprint solution on boards where area is limited. ADP1720 C1 C2 IN OUT R1 R2 EN GND (BOTTOM) Figure 28. Example PCB Layout Rev.
PAGE 15
ADP1720 OUTLINE DIMENSIONS 3.20 3.00 2.80 8 3.20 3.00 2.80 1 5 5.15 4.90 4.65 4 PIN 1 0.65 BSC 0.95 0.85 0.75 1.10 MAX 0.15 0.00 0.38 0.22 COPLANARITY 0.10 8° 0° 0.23 0.08 0.80 0.60 0.40 SEATING PLANE COMPLIANT TO JEDEC STANDARDS MO-187-AA Figure 29. 8-Lead Mini Small Outline Package [MSOP] (RM-8) Dimensions shown in millimeters ORDERING GUIDE Model ADP1720ARMZ-5-R7 1 ADP1720ARMZ-3.3-R71 ADP1720ARMZ-R71 ADP1720-5-EVALZ1 ADP1720-3.