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LT3012B 250mA, 4V to 80V Low Dropout Micropower Linear Regulator
FEATURES
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DESCRIPTIO
U APPLICATIO S
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Wide Input Voltage Range: 4V to 80V Low Quiescent Current: 40µA Low Dropout Voltage: 400mV Output Current: 250mA No Protection Diodes Needed Adjustable Output from 1.24V to 60V Stable with 3.3µF Output Capacitor Stable with Aluminum, Tantalum or Ceramic Capacitors Reverse-Battery Protection No Reverse Current Flow from Output to Input Thermal Limiting Thermally Enhanced 16-Lead TSSOP and 12-Pin (4mm × 3mm) DFN Packages
The LT®3012B is a high voltage, micropower low dropout linear regulator. The device is capable of supplying 250mA of output current with a dropout voltage of 400mV. Designed for use in battery-powered or high voltage systems, the low quiescent current (40µA operating) makes the LT3012B an ideal choice. Quiescent current is also well controlled in dropout. Other features of the LT3012B include the ability to operate with very small output capacitors. The regulators are stable with only 3.3µF on the output while most older devices require between 10µF and 100µF for stability. Small ceramic capacitors can be used without any need for series resistance (ESR) as is common with other regulators. Internal protection circuitry includes reverse-battery protection, current limiting, thermal limiting and reverse current protection. The device is available with an adjustable output with a 1.24V reference voltage. The LT3012B regulator is available in the 16-lead TSSOP and 12 pin low profile (0.75mm) (4mm × 3mm) DFN packages with an exposed pad for enhanced thermal handling capability.
, LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
Low Current High Voltage Regulators Regulator for Battery-Powered Systems Telecom Applications Automotive Applications
TYPICAL APPLICATIO
5V Supply
400 350
DROPOUT VOLTAGE (mV)
VOUT 5V 250mA 3.3µF
300 250 200 150 100 50 0 0 50 100 150 200 OUTPUT CURRENT (mA) 250
IN VIN 5.4V TO 80V 1µF
OUT LT3012B ADJ GND 249k
3012B TA01
750k
U
Dropout Voltage
3012B TA02
U
3012bf
1
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LT3012B
ABSOLUTE
AXI U
RATI GS (Note 1)
Storage Temperature Range TSSOP Package ........................... –65°C to 150°C DFN Package ............................... –65°C to 125°C Operating Junction Temperature Range (Notes 3, 9, 10) ........................... –40°C to 125°C Lead Temperature (Soldering, 10 sec)............ 300°C
IN Pin Voltage ................................................... ±80V OUT Pin Voltage ............................................... ±60V IN to OUT Differential Voltage ........................... ± 80V ADJ Pin Voltage .................................................. ± 7V Output Short-Circuit Duration ..................... Indefinite
U U W PACKAGE/ORDER I FOR ATIO
TOP VIEW
TOP VIEW
GND 1 2 3 4 5 6 7 8 17 16 GND 15 NC 14 IN 13 IN 12 NC 11 NC 10 NC 9 GND
NC OUT OUT ADJ GND NC
1 2 3 13 4 5 6
12 NC 11 IN 10 IN 9 8 7 NC NC NC
DE PACKAGE 12-LEAD (4mm × 3mm) PLASTIC DFN TJMAX = 125°C, θJA = 40°C/ W, θJC = 16°C/ W EXPOSED PAD (PIN 13) IS GND MUST BE SOLDERED TO PCB
ORDER PART NUMBER LT3012BEDE
DE PART MARKING 3012B
Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: http://www.linear.com/leadfree/ Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TJ = 25°C.
PARAMETER Minimum Input Voltage ADJ Pin Voltage (Notes 2, 3) Line Regulation Load Regulation (Note 2) CONDITIONS ILOAD = 250mA VIN = 4V, ILOAD = 1mA 4.5V < VIN < 80V, 1mA < ILOAD < 250mA ∆VIN = 4V to 80V, ILOAD = 1mA (Note 2) VIN = 4.5V, ∆ILOAD = 1mA to 250mA VIN = 4.5V, ∆ILOAD = 1mA to 250mA
●
2
U
W W
W
NC OUT OUT ADJ GND NC GND
FE PACKAGE 16-LEAD PLASTIC TSSOP
TJMAX = 125°C, θJA = 40°C/ W, θJC = 16°C/ W EXPOSED PAD (PIN 17) IS GND MUST BE SOLDERED TO PCB
ORDER PART NUMBER LT3012BEFE
FE PART MARKING 3012BEFE
MIN 1.225 ● 1.2
● ●
TYP 4 1.24 1.24 0.1 7
MAX 4.5 1.255 1.28 5 12 25
UNITS V V V mV mV mV
3012bf
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LT3012B
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TJ = 25°C.
PARAMETER Dropout Voltage VIN = VOUT(NOMINAL) (Notes 4, 5) CONDITIONS ILOAD = 10mA ILOAD = 10mA ILOAD = 50mA ILOAD = 50mA ILOAD = 250mA ILOAD = 250mA GND Pin Current VIN = 4.5V (Notes 4, 6) Output Voltage Noise ADJ Pin Bias Current Ripple Rejection Current Limit Reverse Output Current (Note 8) ILOAD = 0mA ILOAD = 100mA ILOAD = 250mA COUT = 10µF, ILOAD = 250mA, BW = 10Hz to 100kHz (Note 7) VIN = 7V(Avg), VRIPPLE = 0.5VP-P, fRIPPLE = 120Hz, ILOAD = 250mA VIN = 7V, VOUT = 0V VIN = 4.5V, ∆VOUT = –0.1V (Note 2) VOUT = 1.24V.