LM4040-50

Part: LM4040B25FTA — Diodes Incorporated

Type: Precision Micropower Shunt Voltage Reference

Description: 2.5 V, ±0.2% (B-grade) precision micropower shunt voltage reference operating from 60 μA to 15 mA, with a typical temperature coefficient of ±20 ppm/°C, in a SOT23 package.

Operating Conditions:

• Reverse current: 0.06–15 mA
• Operating ambient temperature: -40 to +125 °C
• Reference voltage: 2.5 V (at IR = 100 μA, TA = +25 °C)

Absolute Maximum Ratings:

• Continuous reverse current: 20 mA
• Continuous forward current: 10 mA
• Operating junction temperature: -40 to +150 °C
• Storage temperature: -55 to +150 °C

Key Specs:

• Reverse breakdown voltage tolerance (B-grade, IR = 100 μA): ±5 mV at +25 °C; ±21 mV at -40 to +85 °C; ±30 mV at -40 to +125 °C
• Minimum operating current: 45 μA typ, 60 μA max at +25 °C; 68 μA max at -40 to +125 °C
• Temperature coefficient (-40 to +125 °C): ±20 ppm/°C typ at IR = 10 mA; ±15 ppm/°C typ at IR = 1 mA and 100 μA; ±100 ppm/°C max (B-grade, IR = 1 mA)
• Reverse breakdown change with current (B-grade, +25 °C): 0.8 mV max for IRMIN ≤ IR ≤ 1 mA; 6.0 mV max for 1 mA ≤ IR ≤ 15 mA
• Dynamic output impedance (IR = 1 mA, f = 120 Hz, IAC = 0.1 IR): 0.3 Ω typ, 0.8 Ω max
• Noise voltage (IR = 100 μA, 10 Hz–10 kHz): 35 μVRMS typ
• Long-term stability (1000 hrs, IR = 100 μA): 120 ppm typ
• Thermal hysteresis (-40 to +125 °C): 0.08% typ

Features:

• No output capacitor required; tolerant of capacitive loads
• Output voltage tolerance: ±0.2% (B-grade) at +25 °C
• Wide operating current range of 60 μA to 15 mA
• Extended temperature range of -40 °C to +125 °C
• Low temperature coefficient: 100 ppm/°C max
• Low output noise
• Green molding, lead-free, RoHS compliant, halogen and antimony free
• Automotive-compliant version available as LM4040Q (separate datasheet)

Applications:

• Battery powered equipment
• Precision power supplies
• Portable instrumentation
• Portable communications devices
• Notebook and palmtop computers
• Data acquisition systems

Package:

• SOT23 (θJA 380 °C/W; PDIS 330 mW at TA = +25 °C, TJ = +125 °C)
• SC70-5 variants are End of Life (EOL)

• Small Package: SOT23
• SC70-5 Variants Are End of Life (EOL)
• No Output Capacitor Required
• Output Voltage Tolerance
• LM4040B: ±0.2% at +25°C
• LM4040C : ±0.5% at +25°C
• LM4040D: ±1% at +25°C
• Low Output Noise
• (10Hz to 10kHz) 45μVRMS
• Wide Operating Current Range 60μA to 15mA
• Extended Temperature Range -40°C to +125°C
• Low Temperature Coefficient 100 ppm/°C (max)
• Green Molding in Small Package SOT23
• Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
• Halogen and Antimony Free. 'Green' Device (Note 3)
• An Automotive-Compliant Part is Available Under Separate Datasheet (LM4040Q)

• Battery Powered Equipment
• Precision Power Supplies
• Portable Instrumentation
• Portable Communications Devices
• Notebook and Palmtop Computers
• Data Acquisition Systems

• Pin 2 must be left floating or connected to pin 1

• Pin 2 must be left floating or connected to pin 1.

** SC70-5 variants are End of Life (EOL).

Caution:

Stresses greater than the Absolute Maximum Ratings specified above, may cause permanent damage to the device. These are stress ratings only; functional operation of the device at conditions between maximum recommended operating conditions and absolute maximum ratings is not implied. Device reliability may be affected by exposure to absolute maximum rating conditions for extended periods of time.

(Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken when handling and transporting these devices.)

Unless otherwise stated voltages specified are relative to the Anode pin.

In a conventional shunt regulator application (Figure 1), an external series resistor (RS) is connected between the supply voltage, VS, and the LM4040.

Figure 1

RS determines the current that flows through the load (IL) and the LM4040 (IR). Because load current and supply voltage can vary, RS should be small enough to supply at least the minimum acceptable IR to the LM4040 even when the supply voltage is at its minimum and the load current is at its maximum value. When the supply voltage is at its maximum and IL is at its minimum, RS should be large enough so that the current flowing through the LM4040 is less than 15mA.

RS is determined by the supply voltage, (VS), the load and operating current, (IL and IR), and the LM4040's reverse breakdown voltage, VR.

$$R_S = \frac{V_S - V_R}{I_L + I_R}$$

Please see http://www.diodes.com/package-outlines.html for the latest version.

LM4040