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LT3014B

3014bfa

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

20mA, 3V to 80V

Low Dropout Micropower

Linear Regulator

The LT

3014B 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) makes the LT3014B

an ideal choice. Quiescent current is also well controlled

in dropout.

Other features of the LT3014B 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 LT3014B 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

LT3014BHV Survives 100V Transients (2ms)

No Protection Diodes Needed

Adjustable Output from 1.22V to 60V

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

400

350

300

250

200

150

100

3014B TA02

OUTPUT CURRENT (mA)

DROPOUT VOLTAGE (mV)

0 4 10 12268 14161820

LT3014B

1μF

5.4V TO

80V

OUT

ADJ

GND

3014B TA01

OUT

20mA

0.47μF

3.92M

1.27M

Summary of content (12 pages)

PAGE 1
LT3014B 20mA, 3V to 80V Low Dropout Micropower Linear Regulator FEATURES DESCRIPTION n The LT®3014B is a high voltage, micropower low dropoutlinear 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) makes the LT3014B an ideal choice. Quiescent current is also well controlled in dropout.
PAGE 2
LT3014B ABSOLUTE MAXIMUM RATINGS (Note 1) IN Pin Voltage, Operating ................................... ±80V Transient (2ms Survival, LT3014BHV) .............. +100V OUT Pin Voltage ................................................. ±60V IN to OUT Differential Voltage ............................ ±80V ADJ Pin Voltage ................................................... ±7V Output Short-Circuit Duration ......................Indeﬁnite Storage Temperature Range ThinSOT Package ..........................
PAGE 3
LT3014B 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 VIN = 3.3V, ΔILOAD = 100μA to 20mA (Note 2) VIN = 3.
PAGE 4
LT3014B TYPICAL PERFORMANCE CHARACTERISTICS Typical Dropout Voltage Guaranteed Dropout Voltage 600 500 Dropout Voltage 500 = TEST POINTS 450 450 500 350 300 TJ = 25°C 250 200 150 100 DROPOUT VOLTAGE (mV) TJ = 125°C DROPOUT VOLTAGE (mV) DROPOUT VOLTAGE (mV) 400 TJ ≤ 125°C 400 TJ ≤ 25°C 300 200 400 250 150 0 –50 0 0 2 4 0 6 8 10 12 14 16 18 20 OUTPUT CURRENT (mA) 2 4 6 8 10 12 14 16 18 20 OUTPUT CURRENT (mA) Quiescent Current IL = 100μA 8 6 4 2 QUIESCENT CURRENT (μA) ADJ PIN VO
PAGE 5
LT3014B TYPICAL PERFORMANCE CHARACTERISTICS Current Limit 100 90 VIN = 7V VOUT = 0V 80 60 CURRENT LIMIT (mA) CURRENT LIMIT (mA) VOUT = 0V 70 TJ = 25°C Reverse Output Current 50 REVERSE OUTPUT CURRENT (μA) Current Limit 80 50 40 30 20 70 60 50 40 30 20 10 10 0 2 4 6 8 10 12 14 16 18 20 INPUT VOLTAGE (V) –25 50 25 0 75 TEMPERATURE (°C) Reverse Output Current 5 4 3 2 75 50 25 TEMPERATURE (°C) 100 64 62 60 0.
PAGE 6
LT3014B TYPICAL PERFORMANCE CHARACTERISTICS Transient Response VOUT 200μV/DIV COUT = 0.47μF IL = 20mA VOUT = 1.22V 1ms/DIV 3014B G22 LOAD CURRENT (mA) OUTPUT VOLTAGE DEVIATION (V) 10Hz to 100kHz Output Noise 0.04 0.02 0 VIN = 7V VOUT = 5V CIN = COUT = 0.47μF CERAMIC $ILOAD = 1mA TO 5mA –0.02 –0.04 6 4 2 0 0 200 600 400 TIME (μs) 800 1000 3014B G23 PIN FUNCTIONS (SOT-23 Package/DD Package) IN (Pin 1/Pin 8): Input. Power is supplied to the device through the IN pin.
PAGE 7
LT3014B APPLICATIONS INFORMATION Adjustable Operation The LT3014B has an output voltage range of 1.22V to 60V. The output voltage is set by the ratio of two external resistors as shown in Figure 1. The device servos the output to maintain the voltage at the adjust pin at 1.22V referenced to ground. The current in R1 is then equal to 1.22V/R1 and the current in R2 is the current in R1 plus the ADJ pin bias current. The ADJ pin bias current, 4nA at 25°C, ﬂows through R2 into the ADJ pin.
PAGE 8
LT3014B APPLICATIONS INFORMATION The GND pin current can be found by examining the GND Pin Current curves in the Typical Performance Characteristics. Power dissipation will be equal to the sum of the two components listed above. 40 CHANGE IN VALUE (%) 20 0 X5R –20 –40 Y5V –60 –80 BOTH CAPACITORS ARE 16V, 1210 CASE SIZE, 10μF –100 –50 –25 50 25 75 0 TEMPERATURE (°C) 100 125 3014B F03 Figure 3. Ceramic Capacitor Temperature Characteristics higher values.
PAGE 9
LT3014B 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 10
LT3014B APPLICATIONS INFORMATION In situations where the ADJ pin is connected to a resistor divider that would pull the ADJ pin above its 7V clamp voltage if the output is pulled high, the ADJ pin input current must be limited to less than 5mA. For example, a resistor divider is used to provide a regulated 1.5V output from the 1.22V reference when the output is forced to 60V.
PAGE 11
LT3014B TYPICAL APPLICATIONS Constant Brightness for Indicator LED over Wide Input Voltage Range RETURN IN OUT LT3014B 1μF 1μF ADJ GND RSET –48V ILED = 1.22V/RSET –48V CAN VARY FROM –3.3V TO –80V PACKAGE DESCRIPTION 3014B TA06 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 2.80 BSC 1.4 MIN 3.85 MAX 2.62 REF 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.
PAGE 12
LT3014B 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.