Datasheet

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ADP3367

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 617/329-4700 Fax: 617/326-8703

+5 V Fixed, Adjustable

Low-Dropout Linear Voltage Regulator

FEATURES

Low Dropout: 150 mV @ 200 mA

Low Dropout: 300 mV @ 300 mA

Low Power CMOS: 17 mA Quiescent Current

Shutdown Mode: 0.2 mA Quiescent Current

300 mA Output Current Guaranteed

Pin Compatible with MAX667

Stable with 10 mF Load Capacitor

+2.5 V to +16.5 V Operating Range

Low Battery Detector

Fixed +5 V or Adjustable Output

High Accuracy: 62%

Dropout Detector Output

Low Thermal Resistance Package*

ESD > 6000 V

APPLICATIONS

Handheld Instruments

Cellular Telephones

Battery Operated Devices

Portable Equipment

Solar Powered Instruments

High Efficiency Linear Power Supplies

FUNCTIONAL BLOCK DIAGRAM

ADP3367

SHDN

LBO

LBI

GND

50mV

SET

OUT

1.255V

REF

TYPICAL OPERATING CIRCUIT

OUT

GNDSET SHDN

ADP3367

+5V

OUTPUT

10µF

+6V

INPUT

–V

OUT

– V

400

200

015

LOAD CURRENT – mA

510

100

= +50°C

300

GUARANTEED 300mA

ADP3367

DISSIPATION LIMIT

STANDARD

SO PACKAGE

DISSIPATION LIMIT

Load Current vs. Input-Output Differential Voltage

ADI’s proprietary Thermal Coastline leadframe used in ADP3367AR

packaging, has 30% lower thermal resistance than the standard

leadframes. This improvement in heat flow rate results in lower

die temperature hence improves reliability.

GENERAL DESCRIPTION

The ADP3367 is a low-dropout precision voltage regulator that

can supply up to 300 mA output current. It can be used to give

a fixed +5 V output with no additional external components or

can be adjusted from +1.3 V to +16 V using two external

resistors. Fixed or adjustable operation can be selected via the

SET input. The low quiescent current (17 µA) in conjunction

with the standby or shutdown mode (0.2 µA) makes this device

especially suitable for battery powered systems. The dropout

voltage when supplying 100 µA is only 15 mV allowing opera-

tion with minimal headroom thereby prolonging the useful bat-

tery life. At higher output current levels the dropout remains

low increasing to just 150 mV when supplying 200 mA. A wide

input voltage range from 2.5 V to 16.5 V is allowable. Addi-

tional features include a dropout detector and a low supply/bat-

tery monitoring comparator. The dropout detector can be used

to signal loss of regulation while the low battery detector can be

used to monitor the input supply voltage.

The ADP3367 is a much improved pin-compatible replacement

for the MAX667. Improvements include lower supply current,

tighter voltage accuracy and superior line and load regulation.

Improved ESD protection (>6000 V) is achieved by advanced

voltage clamping structures. The ADP3367 is specified over the

industrial temperature range –40°C to +85°C and is available in

narrow surface mount (SOIC) packages.

Summary of content (8 pages)

PAGE 1
a +5 V Fixed, Adjustable Low-Dropout Linear Voltage Regulator ADP3367 FEATURES Low Dropout: 150 mV @ 200 mA Low Dropout: 300 mV @ 300 mA Low Power CMOS: 17 mA Quiescent Current Shutdown Mode: 0.2 mA Quiescent Current 300 mA Output Current Guaranteed Pin Compatible with MAX667 Stable with 10 mF Load Capacitor +2.5 V to +16.
PAGE 2
ADP3367–SPECIFICATIONS (V IN Parameter Min Typ Input Voltage, VIN 2.5 Output Voltage, V OUT Maximum Output Current 4.9 200 = +9 V, GND = 0 V, VOUT = +5 V, TA = TMIN to TMAX unless otherwise noted) Max Units 16.5 V 5.0 5.1 V mA VSET = 0 V, VIN = 6 V, IOUT = 10 mA VIN = +9 V, + 4.5 V < V OUT < +5.5 V 0.2 0.
PAGE 3
ADP3367 PIN FUNCTION DESCRIPTION GENERAL INFORMATION The ADP3367 contains a micropower bandgap reference voltage source, an error amplifier A1, two comparators (C1, C2) and a series PNP output pass transistor. Mnemonic Function DD Dropout Detector Output. PNP collector output which sources current as dropout is reached. VIN Voltage Regulator Input. GND Ground Pin. Must be connected to 0 V. CIRCUIT DESCRIPTION LBI Low Battery Detect Input. Compared with 1.255 V. LBO Low Battery Detect Output.
PAGE 4
ADP3367–Typical Performance Characteristics 500 2.5 TA = +25°C VIN = 6V CL = 10µF 2.0 1.5 ∆V – mV DROPOUT VOLTAGE – mV TA = +25°C 250 1.0 0.5 10 100 1 200 0.0 300 0 50 100 ∆1 – mA LOAD CURRENT – mA Figure 2. Dropout Voltage vs. Load Current 150 200 Figure 5. Load Regulation (DVOUT vs. DIOUT) 10 TA = +25°C GROUND CURRENT – mA VIN = 6V TA = +25°C +10V VIN 1 +6V 0.1 200mV VOUT 0.01 0.01 0.1 1 10 100 1000 0V CH1 2.00V CH2 200mV M 2.00ms IOUT – mA Figure 3.
PAGE 5
ADP3367 APPLICATIONS INFORMATION Circuit Configurations Low Supply or Low Battery Detection The ADP3367 contains on-chip circuitry for low power supply or battery detection. If the voltage on the LBI pin falls below the internal 1.255 V reference, then the open drain output LBO will go low. The low threshold voltage may be set to any voltage above 1.255 V by appropriate resistor divider selection. For a fixed +5 V output the SET input should be grounded, and no external resistors are necessary.
PAGE 6
ADP3367 + +5V OUTPUT OUT IN + VIN ADP3367 C1 10µF R2 10kΩ LBO LBI DROPOUT STATUS OUTPUT DD SET GND SHDN R1 100kΩ reached, the DD output starts sourcing current into the SET input through R3. This increases the SET voltage so that the regulator feedback loop does not drive the internal PNP transistor as hard as it otherwise would. As the input voltage continues to decrease, more current is sourced, thereby reducing the PNP drive even further.
PAGE 7
ADP3367 perature differential between the die and PC board; remember, the rate at which heat is transferred is directly proportional to the temperature differential. This may be expressed in terms of power dissipation as follows: PD = (TJ – TA)/(θJA) where: Various PC board layout techniques could be used to remove the heat from the immediate vicinity of the package. Consider the following issues when designing a board layout: TJ = Die Junction Temperature (°C) TA = Ambient Temperature (°C) 1.
PAGE 8
ADP3367 UNREGULATED DC processor. Monitoring the supply, the ADM705 will generate a reset if the supply voltage falls below 4.65 V. Early warning of an impending power fail is generated by a power fail comparator on the ADM705. A resistive divider network samples the preregulator input voltage so that failing power is detected while the regulator is still operating normally. An interrupt is generated so that a power-down sequence can be completed before power is completely lost.