LT1763 Linear Technology Corporation, LT1763 Datasheet
LT1763
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LT1763 Summary of contents
Page 1
... A Quiescent current is well controlled; it does not rise in dropout as it does with many other regulators. A key feature of the LT1763 regulators is low output noise. With the addition of an external 0.01µF bypass capacitor, output noise drops to 20µV bandwidth. The LT1763 regulators are stable with output capacitors as low as 3.3µ ...
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... U PACKAGE/ORDER I FOR ATIO TOP VIEW OUT 1 SENSE/ADJ* 2 GND 3 BYP 4 S8 PACKAGE 8-LEAD PLASTIC SO *PIN 2: SENSE FOR LT1763-1.5/ LT1763-1.8/LT1763-2.5/ LT1763-3/LT1763-3.3/LT1763-5 ADJ FOR LT1763 = 150°C, θ 70°C/ W, JMAX JA θ = 35° SEE THE APPLICATIONS INFORMATION SECTION. ORDER PART NUMBER ...
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... LT1763-1.5 V (Note 4) LT1763-1.8 V LT1763-2.5 V LT1763-3 LT1763-3.3 V LT1763-5 ADJ Pin Voltage LT1763 (Notes 3, 4) Line Regulation LT1763-1.5 LT1763-1.8 LT1763-2.5 LT1763-3 LT1763-3.3 LT1763-5 LT1763 (Note 3) LT1763 (Note 3) Load Regulation LT1763-1.5 LT1763-1.8 LT1763-2.5 LT1763-3 LT1763-3.3 LT1763-5 LT1763 (Note 3) Dropout Voltage I = 10mA LOAD 10mA ...
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... A characterization and correlation with statistical process controls. The LT1763 (MP grade) is 100% tested and guaranteed over the –55°C to 125°C temperature range. Note 3: The LT1763 (adjustable version) is tested and specified for these conditions with the ADJ pin connected to the OUT pin ...
Page 5
... OUTPUT CURRENT (mA) 1763 G01 Quiescent Current SHDN ∞ (LT1763-1.5/-1.8/-2.5/-3/-3.3/- 250k 5µA (LT1763 –50 – 100 125 TEMPERATURE (°C) 1763 G04 LT1763-2.5 Output Voltage 2 ...
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... LT1763 Series W U TYPICAL PERFORMANCE CHARACTERISTICS LT1763-5 Output Voltage 5.100 I = 1mA L 5.075 5.050 5.025 5.000 4.975 4.950 4.925 4.900 – –50 100 TEMPERATURE (°C) 1763 G08 LT1763-1.8 Quiescent Current 250 T = 25°C J 225 = ∞ 200 175 150 125 ...
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... 5Ω 300mA 15Ω 100mA INPUT VOLTAGE (V) LT1763 Series LT1763-2.5 GND Pin Current 1200 1000 R = 50Ω 50mA* L 800 T V 600 = 1.8V *FOR 250Ω L 400 I = 10mA 2.5k 200 L I ...
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... LT1763 Series W U TYPICAL PERFORMANCE CHARACTERISTICS LT1763-2.5 GND Pin Current 25° SHDN 10 *FOR V = 2.5V OUT R = 5Ω 500mA 8.33Ω 300mA 25Ω 100mA INPUT VOLTAGE (V) 1763 G20 LT1763-5 ...
Page 9
... OUT 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 125 100 1 INPUT VOLTAGE (V) 1763 G30 Reverse Output Current 0V 1.22V (LT1763) IN OUT 1.5V (LT1763-1.5) OUT V = 1.8V (LT1763-1.8) OUT 2.5V (LT1763-2.5) OUT (LT1763-3) 14 OUT V = 3.3V (LT1763-3.3) OUT (LT1763-5) OUT 10 8 LT1763-1.5/-1.8/ -2.5/-3/-3.3/- LT1763 2 0 –50 – ...
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... LT1763 Series W U TYPICAL PERFORMANCE CHARACTERISTICS LT1763 Minimum Input Voltage 2.50 2.25 2.00 1.75 1.50 1.25 1.00 0.75 0.50 0. 1.22V OUT 0 –50 – TEMPERATURE (°C) Output Noise Spectral Density BYP 10 LT1763-3 LT1763-3.3 LT1763-5 1 LT1763 LT1763-2.5 LT1763-1.8 LT1763-1.5 0 10µF OUT I = 500mA L 0.01 10 100 1k FREQUENCY (Hz) RMS Output Noise vs Bypass Capacitor ...
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... G46 V OUT 100µV/DIV 1763 G44 0.10 0.05 –0.05 –0.10 600 400 200 600 800 1000 1763 G48 LT1763 Series LT1763-5 10Hz to 100kHz Output Noise C = 100pF BYP 1ms/DIV C = 10µF OUT I = 500mA 1763 G47 L LT1763-5 10Hz to 100kHz Output Noise C = 0.01µ ...
Page 12
... ADJ (Pin 2/Pin 5): Adjust. For the adjustable LT1763, this is the input to the error amplifier. This pin is internally clamped to ±7V. It has a bias current of 30nA which flows ...
Page 13
... In battery backup applications where the output can be held backup battery when the input is pulled to ground, the LT1763-X acts like it has a diode in series with its output and prevents reverse current flow. Additionally, in dual supply applications where the regulator load is re- ...
Page 14
... U APPLICATIONS INFORMATION Output Capacitance and Transient Response The LT1763 regulators are designed to be stable with a wide range of output capacitors. The ESR of the output capacitor affects stability, most notably with small capaci- tors. A minimum output capacitor of 3.3µF with an ESR of 3Ω or less is recommended to prevent oscillations. The LT1763 micropower device and output transient response will be a function of output capacitance ...
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... Pin Current curves in the Typical Performance Character- istics. Power dissipation will be equal to the sum of the two components listed above. The LT1763 series regulators have internal thermal limit- ing designed to protect the device during overload condi- tions. For continuous normal conditions, the maximum junction temperature rating of 125° ...
Page 16
... IN(MAX) which can be plugged in backward. The output of the LT1763-X 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. For fixed voltage versions, the output will act like a large resistor, typically 500kΩ or higher, limiting current flow to less than 100µ ...
Page 17
... Current flow back into the output will follow the curve shown in Figure 7. When the IN pin of the LT1763-X is forced below the OUT pin or the OUT pin is pulled above the IN pin, input current will typically drop to less than 2µA. This can happen if the ...
Page 18
... LT1763 Series PACKAGE DESCRIPTION .050 BSC .245 MIN .030 ±.005 TYP RECOMMENDED SOLDER PAD LAYOUT .010 – .020 (0.254 – 0.508) .008 – .010 (0.203 – 0.254) .016 – .050 (0.406 – 1.270) NOTE: 1. DIMENSIONS IN (MILLIMETERS) 2. DRAWING NOT TO SCALE 3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. ...
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... LTC DWG # 05-08-1695) 0.65 ±0.05 PACKAGE OUTLINE 0.25 ± 0.05 0.50 BSC 3.30 ±0.05 (2 SIDES) 4.00 ±0.10 (2 SIDES 0.20 TYP 3.00 ±0.10 1.70 ± 0.10 (2 SIDES) (2 SIDES) 0.75 ±0.05 0.00 – 0.05 LT1763 Series 0.38 ± 0. 0.115 TYP 7 12 PIN 1 NOTCH (UE12/DE12) DFN 0603 6 1 0.25 ± 0.05 0.50 BSC 3.30 ±0.10 (2 SIDES) BOTTOM VIEW—EXPOSED PAD 19 1763fc ...
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... LT1763 Series U TYPICAL APPLICATION + V > 3.8V IN RELATED PARTS PART NUMBER DESCRIPTION LT1120 125mA Low Dropout Regulator with 20µA I LT1121 150mA Micropower Low Dropout Regulator LT1129 700mA Micropower Low Dropout Regulator LT1175 500mA Negative Low Dropout Micropower Regulator LT1521 300mA Low Dropout Micropower Regulator with Shutdown LT1529 3A Low Dropout Regulator with 50µ ...