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LT3027 Dual 100mA, Low Dropout, Low Noise, Micropower Regulator with Independent Inputs
FEATURES
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DESCRIPTIO
Low Noise: 20µVRMS (10Hz to 100kHz) Low Quiescent Current: 25µA/Channel Independent Inputs Wide Input Voltage Range: 1.8V to 20V Output Current: 100mA/Channel Very Low Shutdown Current: <0.1µA Low Dropout Voltage: 300mV at 100mA Adjustable Output from 1.22V to 20V Stable with 1µF Output Capacitor Stable with Aluminum, Tantalum or Ceramic Capacitors Reverse Battery Protected No Protection Diodes Needed Overcurrent and Overtemperature Protected Thermally Enhanced 10-Lead MSOP and DFN Packages
U APPLICATIO S
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Cellular Phones Pagers Battery-Powered Systems Frequency Synthesizers Wireless Modems
The LT ®3027 is a dual, micropower, low noise, low dropout regulator with independent inputs. With an external 0.01µF bypass capacitor, output noise is a low 20µVRMS over a 10Hz to 100kHz bandwidth. Designed for use in battery-powered systems, the low 25µA quiescent current per channel makes it an ideal choice. In shutdown, quiescent current drops to less than 0.1µA. Shutdown control is independent for each channel, allowing for flexibility in power management. The device is capable of operating over an input voltage from 1.8V to 20V, and can supply 100mA of output current from each channel with a dropout voltage of 300mV. Quiescent current is well controlled in dropout. The LT3027 regulator is stable with output capacitors as low as 1µF. Small ceramic capacitors can be used without the series resistance required by other regulators. Internal protection circuitry includes reverse battery protection, current limiting and thermal limiting protection. The device is available as an adjustable device with a 1.22V reference voltage. The LT3027 regulator is available in the thermally enhanced 10-lead MSOP and low profile (0.75mm) 3mm × 3mm DFN packages.
, LTC and LT are registered trademarks of Linear Technology Corporation. Protected by U.S. Patents, including 6118263, 6144250.
TYPICAL APPLICATIO
VIN1 3.7V TO 20V IN1 1µF SHDN1 BYP1 ADJ1 OUT1
3.3V/2.5V Low Noise Regulators 10Hz to 100kHz Output Noise
3.3V AT 100mA 20µVRMS NOISE 0.01µF 422k 10µF
249k LT3027 VIN2 2.9V TO 20V IN2 1µF SHDN2 BYP2 ADJ2 OUT2 0.01µF 261k 2.5V AT 100mA 20µVRMS NOISE 10µF
VOUT 100µV/DIV
GND
249k
3027 TA01
U
20µVRMS
3027 TA01b
U
3027f
1
LT3027
ABSOLUTE AXI U RATI GS
IN1, IN2 Pin Voltage .............................................. ± 20V OUT1, OUT2 Pin Voltage ....................................... ± 20V Input to Output Differential Voltage ....................... ± 20V ADJ1, ADJ2 Pin Voltage ......................................... ± 7V BYP1, BYP2 Pin Voltage ....................................... ± 0.6V SHDN1, SHDN2 Pin Voltage ................................. ± 20V Output Short-Circut Duration .......................... Indefinite
U U W PACKAGE/ORDER I FOR ATIO
TOP VIEW BYP2 ADJ2 SHDN2 ADJ1 BYP1 1 2 3 4 5 11 10 OUT2 9 IN2 8 IN1 7 SHDN1 6 OUT1
ORDER PART NUMBER LT3027EDD LT3027IDD DD PART MARKING LBKN LBMC
BYP2 ADJ2 SHDN2 ADJ1 BYP1 1 2 3 4 5
DD PACKAGE 10-LEAD (3mm × 3mm) PLASTIC DFN EXPOSED PAD (PIN 11) IS GND MUST BE SOLDERED TO PCB TJMAX = 125°C, θJA = 43°C/ W, θJC = 3°C/ W
Consult factory for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. (Note 2)
PARAMETER Minimum Input Voltage (Notes 3, 10) ADJ1, ADJ2 Pin Voltage (Note 3, 4) Line Regulation (Note 3) Load Regulation (Note 3) Dropout Voltage VIN = VOUT(NOMINAL) (Notes 5, 6, 10) CONDITIONS ILOAD = 100mA VIN = 2V, ILOAD = 1mA 2.3V < VIN < 20V, 1mA < ILOAD < 100mA ∆VIN = 2V to 20V, ILOAD = 1mA VIN = 2.3V, ∆ILOAD = 1mA to 100mA VIN = 2.3V, ∆ILOAD = 1mA to 100mA ILOAD = 1mA ILOAD = 1mA ILOAD = 10mA ILOAD = 10mA ILOAD = 50mA ILOAD = 50mA ILOAD = 100mA ILOAD = 100mA
●
2
U
W W
W
(Note 1)
Operating Junction Temperature Range (Note 2) ............................................ – 40°C to 125°C Storage Temperature Range DD Package ...................................... – 65°C to 125°C MSE Package ................................... – 65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C
TOP VIEW 10 9 8 7 6 OUT2 IN2 IN1 SHDN1 OUT1
ORDER PART NUMBER LT3027EMSE LT3027IMSE MSE PART MARKING LTBKK LTBMD
11
MSE PACKAGE 10-LEAD PLASTIC MSOP EXPOSED PAD (PIN 11) IS GND MUST BE SOLDERED TO PCB
TJMAX = 150°C, θJA = 40°C/ W, θJC = 10°C/ W
MIN
TYP 1.8
MAX 2.3 1.235 1.250 10 12 25 0.15 0.19 0.22 0.29 0.28 0.38 0.35 0.45
UNITS V V V mV mV mV V V V V V V V V
● ● ●
1.205 1.190
1.220 1.220 1 1 0.10
●
0.17
●
0.24
●
0.30
●
3027f
LT3027
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. (Note 2)
PARAMETER GND Pin Current (Per Channel) VIN = .