LT3028 LINER [Linear Technology], LT3028 Datasheet
LT3028
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LT3028 Summary of contents
Page 1
... Internal protection circuitry includes reverse-battery pro- tection, current limiting and thermal limiting protection. The device is available as an adjustable device with a 1.22V reference voltage. The LT3028 regulator is available in the thermally enhanced 16-lead TSSOP and 16-lead, low profile (5mm × 3mm × 0.75mm) DFN packages. ...
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... IN2 LOAD = 2.3V, ∆I = 1mA to 500mA IN1 LOAD V = 2.3V, ∆I = 1mA to 500mA IN1 LOAD ORDER PART TOP VIEW NUMBER 16 ADJ1 15 SHDN1 LT3028EDHC 14 IN1 LT3028IDHC 13 IN1 17 12 IN2 11 IN2 DHC PART 10 SHDN2 MARKING 9 ADJ2 3028 DHC PACKAGE 3028I = 40°C/ W, θ = 10° 25°C. (Note 2) ...
Page 3
... The LT3028I is guaranteed and tested over the full – 40°C to 125°C operating junction temperature range. Note 3: The LT3028 is tested and specified for these conditions with the ADJ1/ADJ2 pin connected to the corresponding OUT1/OUT2 pin. LT3028 = 25° ...
Page 4
... Note 8: ADJ1 and ADJ2 pin bias current flows into the pin. Note 9: SHDN1 and SHDN2 pin current flows into the pin. Note 10: For the LT3028 dropout voltage will be limited by the minimum input voltage specification under some output voltage/load conditions. See the curve of Minimum Input Voltage in the Typical Performance Characteristics ...
Page 5
... GND Pin Current vs I LOAD OUT(NOMINAL 25° 100 150 200 250 300 350 400 450 500 OUTPUT CURRENT (mA) LT3028 Quiescent Current (Per Output 25° 250k SHDN SHDN 0 ...
Page 6
... LT3028 W U TYPICAL PERFOR A CE CHARACTERISTICS SHDN1 or SHDN2 Pin Threshold (Off-to-On) 1.0 0 FULL 0.8 L 0.7 0 1mA L 0.5 0.4 0.3 0.2 0.1 0 – 125 –25 100 TEMPERATURE (°C) 3028 G16 ADJ1 or ADJ2 Pin Bias Current 100 –50 – 100 125 TEMPERATURE (° ...
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... 100 1k 10k 100k FREQUENCY (Hz) 3028 G30 2.50 2.25 2. 100mA L 1.75 1. 50mA L 1.25 1.00 0.75 0.50 0.25 0 – 100 125 3028 G32 LT3028 Output 2 Input Ripple Rejection IN2 OUT2(NOMINAL 0.5V RIPPLE P 120Hz I = 50mA L 0 –50 – 1000 TEMPERATURE (°C) Output 1 Ripple Rejection ...
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... LT3028 W U TYPICAL PERFOR A CE CHARACTERISTICS Channel-to-Channel Isolation 100 90 CHANNEL CHANNEL GIVEN CHANNEL IS TESTED 30 WITH 50mVRMS SIGNAL ON OPPOSING CHANNEL, BOTH 20 CHANNELS DELIVERING FULL CURRENT 25° 100 1k 10k 100k 1M FREQUENCY (Hz) 3028 G34 Output 1 Load Regulation 5 ∆I ...
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... TIME (µs) 3028 G46 Output 1 Transient Response C 0.10 0.05 0 –0.05 –0.10 600 400 200 0 600 800 1000 0 3028 G48 LT3028 10Hz to 100kHz Output Noise C = 1000pF BYP V OUT 100µV/DIV C = 10µF 1ms/DIV 3028 G43 OUT I = FULL LOAD L V SET FOR 5V OUT ...
Page 10
... In general, the output impedance of a battery rises with frequency advisable to include a bypass capacitor in battery-powered circuits. A bypass capacitor in the range of 1µF to 10µF is sufficient. The LT3028 regulator is designed to withstand reverse voltages on the IN pins with respect to ground and the OUT pins. In the case of a ...
Page 11
... A minimum output capacitor of 1µF with an ESR of 3Ω or less is recommended for Output 2 to prevent oscillations. A minimum output capacitor of 3.3µF with an ESR of 3Ω or less is recommended for Output 1. The LT3028 is a micropower device and output transient response will ⎛ ...
Page 12
... With 1000pF or larger bypass capacitor on this output, a 6.8µF output capacitor is recommended. The shaded region of Figures 2 and 3 define the regions over which the LT3028 regulator is stable. The minimum ESR needed is defined by the amount of bypass capacitance used, while the maximum ESR is 3Ω ...
Page 13
... The ground pin current can be found by examining the GND Pin Current curves in the Typical Performance Char- acteristics section. Power dissipation will be equal to the sum of the two components listed above. The LT3028 regulator has internal thermal limiting de- signed to protect the device during overload conditions For continuous normal conditions, the maximum junction temperature rating of 125° ...
Page 14
... The device will protect both itself and the load. This provides protection against batteries which can be plugged in backward. The output of the LT3028 can be pulled below ground without damaging the device. If the input is left open circuit or grounded, the output can be pulled below ground by 20V. The output will act like an open circuit ...
Page 15
... The output voltage may be held up while the input is either pulled to ground, pulled to some intermediate voltage or is left open circuit. When the IN pin of the LT3028 is forced below either OUT pin or either OUT pin is pulled above the IN pin, input current PACKAGE DESCRIPTIO (.141) 6.60 ± ...
Page 16
... LT3028 PACKAGE DESCRIPTIO 3.50 ±0.05 1.65 ±0.05 (2 SIDES) 2.20 ±0.05 0.25 ± 0.05 0.50 BSC 4.40 ±0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS NOTE: 1. DRAWING PROPOSED TO BE MADE VARIATION OF VERSION (WJED-1) IN JEDEC PACKAGE OUTLINE MO-229 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS RELATED PARTS PART NUMBER DESCRIPTION ...