LT1761 Linear Technology Corporation, LT1761 Datasheet
LT1761
Available stocks
Related parts for LT1761
LT1761 Summary of contents
Page 1
... The device is available in fixed output voltages of 1.2V, 1.5V, 1.8V, 2V, 2.5V, 2.8V, 3V, 3.3V and 5V, and as an adjustable device with a 1.22V reference voltage. The LT1761 regulators are available in the 5-lead SOT-23 package. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. ...
Page 2
... LT1761 Series ABSOLUTE AXI U RATI GS IN Pin Voltage ........................................................ ±20V OUT Pin Voltage .................................................... ±20V Input to Output Differential Voltage ....................... ±20V ADJ Pin Voltage ...................................................... ±7V BYP Pin Voltage.................................................... ±0.6V SHDN Pin Voltage ................................................. ±20V U PACKAGE/ORDER I FOR ATIO TOP VIEW TOP VIEW OUT ...
Page 3
... LT1761-2.5 LT1761-2.8 LT1761-3 LT1761-3.3 LT1761-5 ADJ Pin Voltage LT1761 (Note 3, 4) Line Regulation LT1761-1.2 LT1761-1.5 LT1761-1.8 LT1761-2 LT1761-2.5 LT1761-2.8 LT1761-3 LT1761-3.3 LT1761-5 LT1761 (Note 3) ΔV = 100mA 1mA IN LOAD 2.3V < V < 20V, 1mA < I < 50mA IN LOAD 2.3V < V < 20V, 1mA < I < 100mA IN LOAD V ...
Page 4
... T PARAMETER CONDITIONS Load Regulation LT1761-1.2 LT1761-1.5 LT1761-1.8 LT1761-2 LT1761-2.5 LT1761-2.8 LT1761-3 LT1761-3.3 LT1761-5 LT1761 (Note 3) V Dropout Voltage I = 1mA LOAD 1mA IN OUT(NOMINAL) LOAD (Notes 10mA ...
Page 5
... Performance at – 40°C and 125°C is assured by design, A characterization and correlation with statistical process controls. The LT1761MP is 100% tested and guaranteed over the – 55°C to 125°C temperature range. Note 3: The LT1761 (adjustable versions) are tested and specified for these conditions with the ADJ pin connected to the OUT pin ...
Page 6
... J 300 250 T = 25°C J 200 150 100 100 0 OUTPUT CURRENT (mA) 1761 G00 Quiescent Current ∞ (250k FOR LT1761-BYP, -SD (5μA FOR LT1761-BYP, -SD SHDN SHDN 0 – ...
Page 7
... L 150 125 100 SHDN SHDN INPUT VOLTAGE (V) LT1761 Series LT1761-3.3 Output Voltage 3.360 I = 1mA L 3.345 3.330 3.315 3.300 3.285 3.270 3.255 3.240 –50 – 100 125 TEMPERATURE (°C) 1761 G09 LT1761-1.2 Quiescent Current ...
Page 8
... LT1761 Series W U TYPICAL PERFOR A CE CHARACTERISTICS LT1761-2.5 Quiescent Current 200 T = 25° ∞ 175 R L 150 125 100 SHDN SHDN INPUT VOLTAGE (V) 1761 G13 LT1761-3.3 Quiescent Current 200 T = 25° ∞ ...
Page 9
... L 1. 50mA 300Ω 1mA 10mA INPUT VOLTAGE (V) 1761 G21 LT1761-BYP, LT1761-SD GND Pin Current 2. 25°C J 2.25 *FOR V = 1.22V OUT 2. 12.2Ω 100mA* L 1.75 1.50 1. 24.4Ω 50mA* 1. 1.22k 0. 122Ω ...
Page 10
... OUT T = 25°C J 300 250 200 150 100 INPUT VOLTAGE (V) 1761 G31 Reverse Output Current 25 1.22V (LT1761-BYP, -SD) 22.5 OUT V = 1.2V (LT1761-1.2) OUT V = 1.5V (LT1761-1.5) 20.0 OUT V = 1.8V (LT1761-1.8) OUT (LT1761-2) 17.5 OUT V = 2.5V (LT1761-2.5) OUT 15 2.8V (LT1761-2.8) OUT (LT1761-3) OUT 12 ...
Page 11
... Minimum Input Voltage 2.5 2 100mA L 1 1.0 0.5 0 100 125 – –25 TEMPERATURE (°C) 1761 G37 = 1mA to 100mA L LT1761-BYP, -SD, -1.2 LT1761-1.5 LT1761-1.8 LT1761-2 LT1761-2.5 LT1761-2.8 LT1761-3 LT1761-3.3 LT1761-5 – 100 125 TEMPERATURE (°C) 1761 G40 RMS Output Noise vs Bypass Capacitor 140 C OUT ...
Page 12
... LOAD CURRENT (mA) 1761 G44 LT1761-5 10Hz to 100kHz Output Noise C = 1000pF BYP V OUT 100μV/DIV 1ms/DIV C = 10μF OUT I = 100mA L LT1761-5 Transient Response BYP 0.2 0.1 0 –0.1 –0.2 100 400 800 1200 TIME (μs) 12 LT1761-5 10Hz to 100kHz Output Noise ...
Page 13
... GND (Pin 2): Ground. SHDN (Pin 3, Fixed/-SD Devices): Shutdown. The SHDN pin is used to put the LT1761 regulators into a low power shutdown state. The output will be off when the SHDN pin is pulled low. The SHDN pin can be driven either by 5V logic or open-collector logic with a pull-up resistor ...
Page 14
... In battery backup applications where the output can be held backup battery when the input is pulled to ground, the LT1761-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 ...
Page 15
... U U APPLICATIO S I FOR ATIO Output Capacitance and Transient Response The LT1761 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 capacitors. A minimum output capacitor of 1μF with an ESR of 3Ω or less is recommended to prevent oscilla- tions ...
Page 16
... Figure 5. Noise Resulting from Tapping on a Ceramic Capacitor The LT1761 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°C must not be exceeded important to give careful consideration to all sources of thermal resistance from junction to ambient ...
Page 17
... The device will protect both itself and the load. This provides protection against batteries which can be plugged in backward. The output of the LT1761-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 ...
Page 18
... Current flow back into the output will follow the curve shown in Figure 6. When the IN pin of the LT1761-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 19
... Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of circuits as described herein will not infringe on existing patent rights. LT1761 Series 2.90 BSC (NOTE 4) 0.30 – 0.45 TYP ...
Page 20
... LT1761 Series 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 ...