Datasheet

ManualsBrandsLinear Technology ManualsIntegrated Circuits (ICs)LDO Voltage Regulator, 1.2 ... 60V, SOT-23-5

LT3014

3014fd

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

20mA, 3V to 80V

Low Dropout Micropower

Linear Regulator

The LT

3014 is a high voltage, micropower low dropout

linear regulator. The device is capable of supplying 20mA of

output current with a dropout voltage of 350mV. Designed

for use in battery-powered or high voltage systems, the low

quiescent current (7μA operating and 1μA in shutdown)

makes the LT3014 an ideal choice. Quiescent current is

also well controlled in dropout.

Other features of the LT3014 include the ability to operate

with very small output capacitors. The regulators are stable

with only 0.47μF on the output while most older devices

require between 10μF and 100μF for stability. Small ceramic

capacitors can be used without the necessary addition of

ESR as is common with other regulators. Internal protec-

tion circuitry includes reverse-battery protection, current

limiting, thermal limiting and reverse current protection.

The device is available as an adjustable device with a 1.22V

reference voltage. The LT3014 regulator is available in the

5-lead ThinSOT and 8-lead DFN packages.

Dropout Voltage

Wide Input Voltage Range: 3V to 80V

Low Quiescent Current: 7µA

Low Dropout Voltage: 350mV

Output Current: 20mA

LT3014HV Survives 100V Transients (2ms)

No Protection Diodes Needed

Adjustable Output from 1.22V to 60V

1µA Quiescent Current in Shutdown

Stable with 0.47µF Output Capacitor

Stable with Aluminum, Tantalum or Ceramic

Capacitors

Reverse-Battery Protection

No Reverse Current Flow from Output

Thermal Limiting

■

Available in 5-Lead ThinSOT

and

8-Lead DFN Packages

Low Current High Voltage Regulators

Regulator for Battery-Powered Systems

Telecom Applications

Automotive Applications

L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

ThinSOT is a trademark of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

Protected by U.S. Patents including 6118263, 6144250.

5V Supply with Shutdown

LT3014

SHDN

1μF

5.4V TO

80V

OUT

ADJ

GND

3014 TA01

OUT

20mA

0.47μF

3.92M

1.27M

SHDN

<0.3V

>2.0V

OUTPUT

OFF

400

350

300

250

200

150

100

3014 TA02

OUTPUT CURRENT (mA)

DROPOUT VOLTAGE (mV)

0 4 10 12268 14161820

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Summary of content (16 pages)

PAGE 1
LT3014 20mA, 3V to 80V Low Dropout Micropower Linear Regulator DESCRIPTION FEATURES n n n n n n n n n n n n n ■ Wide Input Voltage Range: 3V to 80V Low Quiescent Current: 7µA Low Dropout Voltage: 350mV Output Current: 20mA LT3014HV Survives 100V Transients (2ms) No Protection Diodes Needed Adjustable Output from 1.22V to 60V 1µA Quiescent Current in Shutdown Stable with 0.
PAGE 2
LT3014 ABSOLUTE MAXIMUM RATINGS (Note 1) IN Pin Voltage, Operating ................................... ±80V Transient (2ms Survival, LT3014HV) ................ +100V OUT Pin Voltage ................................................. ±60V IN to OUT Differential Voltage ............................ ±80V ADJ Pin Voltage ................................................... ±7V SHDN Pin Input Voltage ..................................... ±80V Output Short-Circuit Duration ......................
PAGE 3
LT3014 ELECTRICAL CHARACTERISTICS The l denotes the speciﬁcations which apply over the full operating temperature range, otherwise speciﬁcations are at TJ = 25°C. SYMBOL CONDITIONS ILOAD = 20mA VIN = 3.3V, ILOAD = 100μA 3.3V < VIN < 80V, 100μA < ILOAD < 20mA l Line Regulation ΔVIN = 3.3V to 80V, ILOAD = 100μA (Note 2) l Load Regulation (Note 2) VIN = 3.3V, ΔILOAD = 100μA to 20mA VIN = 3.
PAGE 4
LT3014 ELECTRICAL CHARACTERISTICS process controls. The LT3014I is guaranteed over the full –40°C to 125°C operating junction temperature. Note 11: This IC includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature will exceed 125°C when overtemperature protection is active. Continuous operation above the speciﬁed maximum operating junction temperature may impair device reliability.
PAGE 5
LT3014 TYPICAL PERFORMANCE CHARACTERISTICS GND Pin Current VIN = 3.3V 900 TJ = 25oC = 1.22V V 800 OUT RL = 617 IL = 20mA* 500 400 RL = 1227 IL = 10mA* 300 200 RL = 1.22k IL = 1mA* 100 0 0 1 2 3 4 5 6 7 INPUT VOLTAGE (V) 8 9 700 600 500 400 300 1.6 1.4 1.2 1.0 0.8 0.6 200 0.4 100 0.2 0 10 1.8 SHDN PIN THRESHOLD (V) GND PIN CURRENT (μA) GND PIN CURRENT (μA) 800 600 2.0 1000 TJ = 25oC 900 *FOR VOUT = 1.
PAGE 6
LT3014 TYPICAL PERFORMANCE CHARACTERISTICS Reverse Output Current REVERSE OUTPUT CURRENT (μA) 7 Input Ripple Rejection Input Ripple Rejection 72 VIN = 0V VOUT = VADJ = 1.22V RIPPLE REJECTION (dB) 6 5 4 3 2 80 VIN = 7V + 0.5VP-P 70 RIPPLE AT f = 120Hz IL = 20mA 68 66 64 62 60 58 1 0 –50 –25 75 50 25 TEMPERATURE (oC) 0 100 75 50 25 TEMPERATURE (oC) 100 0 –5 LOAD REGULATION (mV) MINIMUM INPUT VOLTAGE (V) ILOAD = 20mA 2.5 2.0 1.5 1.0 0.5 20 100 COUT = 0.
PAGE 7
LT3014 PIN FUNCTIONS (SOT-23 Package/DD Package) IN (Pin 1/Pin 8): Input. Power is supplied to the device through the IN pin. A bypass capacitor is required on this pin if the device is more than six inches away from the main input ﬁlter capacitor. In general, the output impedance of a battery rises with frequency, so it is advisable to include a bypass capacitor in battery-powered circuits. A bypass capacitor in the range of 0.1μF to 10μF is sufﬁcient.
PAGE 8
LT3014 APPLICATIONS INFORMATION The LT3014 is a 20mA high voltage low dropout regulator with micropower quiescent current and shutdown. The device is capable of supplying 20mA at a dropout voltage of 350mV. The low operating quiescent current (7μA) drops to 1μA in shutdown. In addition to the low quiescent current, the LT3014 incorporates several protection features which make it ideal for use in battery-powered systems. The device is protected against both reverse input and reverse output voltages.
PAGE 9
LT3014 APPLICATIONS INFORMATION Voltage and temperature coefﬁcients are not the only sources of problems. Some ceramic capacitors have a piezoelectric response. A piezoelectric device generates voltage across its terminals due to mechanical stress, similar to the way a piezoelectric accelerometer or microphone works. For a ceramic capacitor the stress can be induced by vibrations in the system or thermal transients.
PAGE 10
LT3014 APPLICATIONS INFORMATION Continuous operation at large input/output voltage differentials and maximum load current is not practical due to thermal limitations. Transient operation at high input/output differentials is possible. The approximate thermal time constant for a 2500sq mm 3/32" FR-4 board with maximum topside and backside area for one ounce copper is 3 seconds. This time constant will increase as more thermal mass is added (i.e. vias, larger board, and other components).
PAGE 11
LT3014 APPLICATIONS INFORMATION Protection Features The LT3014 incorporates several protection features which make it ideal for use in battery-powered circuits. In addition to the normal protection features associated with monolithic regulators, such as current limiting and thermal limiting, the device is protected against reverse-input voltages, and reverse voltages from output to input.
PAGE 12
LT3014 TYPICAL APPLICATIONS 5V Buck Converter with Low Current Keep Alive Backup D2 D1N914 6 VIN 5.5V* TO 60V C2 0.33μF BOOST 4 C3 4.7μF 100V CERAMIC VIN SW 2 14 VOUT 5V 1A/20mA D1 10MQ060N LT1766 15 L1† 15μH SHDN BIAS SYNC FB GND 10 R1 15.4k 12 R2 4.99k VC + C1 100μF 10V SOLID TANTALUM 1, 8, 9, 16 11 CC 1nF IN LT3014 OPERATING CURRENT SHDN LOW HIGH 3014 TA03 OUT 3.92M ADJ GND 1.27M * FOR INPUT VOLTAGES BELOW 7.
PAGE 13
LT3014 TYPICAL APPLICATIONS LT3014 Automotive Application VIN 12V (LATER 42V) IN + 1μF NO PROTECTION DIODE NEEDED! OUT LT3014 R1 1μF ADJ SHDN GND R2 LOAD: CLOCK, SECURITY SYSTEM ETC OFF ON LT3014 Telecom Application VIN 48V (72V TRANSIENT) IN OUT LT3014 1μF ADJ SHDN GND + R1 NO PROTECTION DIODE NEEDED! 1μF R2 OFF ON LOAD: SYSTEM MONITOR ETC – BACKUP BATTERY 3014 TA05 Constant Brightness for Indicator LED over Wide Input Voltage Range RETURN IN 1μF OFF ON OUT LT3014 SHDN 1μF
PAGE 14
LT3014 PACKAGE DESCRIPTION S5 Package 5-Lead Plastic TSOT-23 (Reference LTC DWG # 05-08-1635) 0.62 MAX 0.95 REF 2.90 BSC (NOTE 4) 1.22 REF 1.4 MIN 3.85 MAX 2.62 REF 2.80 BSC 1.50 – 1.75 (NOTE 4) PIN ONE RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR 0.30 – 0.45 TYP 5 PLCS (NOTE 3) 0.95 BSC 0.80 – 0.90 0.20 BSC 0.01 – 0.10 1.00 MAX DATUM ‘A’ 0.30 – 0.50 REF 0.09 – 0.20 (NOTE 3) NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING 4.
PAGE 15
LT3014 PACKAGE DESCRIPTION DD Package 8-Lead Plastic DFN (3mm × 3mm) (Reference LTC DWG # 05-08-1698) 0.675 p0.05 3.5 p0.05 1.65 p0.05 2.15 p0.05 (2 SIDES) PACKAGE OUTLINE 0.25 p 0.05 0.50 BSC 2.38 p0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS R = 0.115 TYP 5 3.00 p0.10 (4 SIDES) 0.38 p 0.10 8 1.65 p 0.10 (2 SIDES) PIN 1 TOP MARK (NOTE 6) (DD) DFN 1203 0.200 REF 0.75 p0.05 0.00 – 0.05 4 0.25 p 0.05 1 0.50 BSC 2.38 p0.10 (2 SIDES) BOTTOM VIEW—EXPOSED PAD NOTE: 1.
PAGE 16
LT3014 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1129 700mA, Micropower, LDO VIN: 4.2V to 30V, VOUT(MIN) = 3.75V, VDO = 0.4V, IQ = 50μA, ISD = 16μA, DD, SOT-223, S8, TO220, TSSOP-20 Packages LT1175 500mA, Micropower Negative LDO VIN: –20V to –4.3V, VOUT(MIN) = –3.8V, VDO = 0.50V, IQ = 45μA, ISD = 10μA, DD, SOT-223, S8 Packages LT1185 3A, Negative LDO VIN: –35V to –4.2V, VOUT(MIN) = –2.40V, VDO = 0.80V, IQ = 2.5mA, ISD <1μA, TO220-5 Package LT1761 100mA, Low Noise Micropower, LDO VIN: 1.