LM4040

Part: LM4040 / LM4041 — Microchip Technology

Type: Precision Micropower Shunt Voltage Reference

Description: Precision micropower shunt voltage reference in a SOT-23 package, with fixed reverse-breakdown voltages of 1.225 V, 2.500 V, 4.096 V and 5.000 V (plus an adjustable LM4041 version), operating from 60 μA to 15 mA (LM4040) or 12 mA (LM4041).

Operating Conditions:

• Supply voltage: not applicable (two-terminal shunt reference; reverse current 60 μA to 15 mA for LM4040-2.5, 68 μA to 15 mA for LM4040-4.1, 74 μA to 15 mA for LM4040-5.0, 60 μA to 12 mA for LM4041)
• Operating temperature: -40 to +85 °C
• LM4041-ADJ output voltage range: 1.24 V to 10 V

Absolute Maximum Ratings:

• Reverse current: 20 mA
• Forward current: 10 mA
• Maximum output voltage (LM4041-ADJ): 15 V
• Power dissipation (TA = +25 °C): 306 mW
• ESD susceptibility: 2 kV HBM, 200 V MM

Key Specs:

• Reverse-breakdown voltage (IR = 100 μA, TA = +25 °C): 2.500 V (LM4040-2.5), 4.096 V (LM4040-4.1), 5.000 V (LM4040-5.0), 1.225 V (LM4041-1.2)
• Voltage tolerance at 25 °C, C-grade: ±12 mV (2.5 V), ±20 mV (4.096 V), ±25 mV (5.0 V), ±6 mV (1.225 V); D-grade: ±25 mV, ±41 mV, ±50 mV, ±12 mV respectively
• Minimum operating current (max, TA = +25 °C, C-grade): 60 μA (2.5 V), 68 μA (4.096 V), 74 μA (5.0 V), 60 μA (1.225 V)
• Temperature coefficient (IR = 1 mA): ±15 ppm/°C typ, ±100 ppm/°C max (C-grade, 2.5 V and 1.225 V); ±150 ppm/°C max (D-grade)
• Reverse dynamic impedance (IR = 1 mA, f = 120 Hz, 25 °C): 0.3 Ω typ, 0.9 Ω max (LM4040-2.5 C-grade); 0.5 Ω typ (4.096 V, 5.0 V, 1.225 V)
• Wideband noise (IR = 100 μA, 10 Hz–10 kHz): 35 μVRMS (2.5 V), 80 μVRMS (4.096 V, 5.0 V), 20 μVRMS (1.225 V)
• Long-term stability (1000 hrs, 25 °C, IR = 100 μA): 120 ppm typ
• Thermal resistance, SOT-23 board-mounted: +326 °C/W typ; TJMAX = +125 °C

Features:

• Small SOT-23 package
• No output capacitor required
• Tolerates capacitive loads
• Fixed reverse-breakdown voltages of 1.225 V, 2.500 V, 4.096 V and 5.000 V
• Adjustable reverse-breakdown version
• Bandgap reference with temperature drift curvature correction and low dynamic impedance

Applications:

• Battery-powered equipment
• Data acquisition systems
• Instrumentation
• Process control
• Energy management
• Product testing
• Automotive electronics
• Precision audio components

Package:

• SOT-23

• Small SOT-23 Package
• No Output Capacitor Required
• Tolerates Capacitive Loads
• Fixed Reverse-Breakdown Voltages of 1.225V, 2.500V, 4.096V, and 5.000V
• Adjustable Reverse-Breakdown Version

• Battery-Powered Equipment
• Data Acquisition Systems
• Instrumentation
• Process Control
• Energy Management
• Product Testing
• Automotive Electronics
• Precision Audio Components

The descriptions of the pins are listed in Table 3-1.

TABLE 3-1: PIN FUNCTION TABLE

T A = Operating Temperature Range, T A = T J = -40°C to +85°C, unless noted.

a. C-grade: ±1.15% = ±0.5% ±100 ppm/°C × 65°C

b. D-grade: ±1.98% = ±1.0% ±150 ppm/°C × 65°C

Example: The C-grade LM4040-2.5 has an overtemperature Reverse-Breakdown Voltage tolerance of ±2.5 × 1.15% = ±29 mV.

† Notice: Stresses above those listed under 'Absolute Maximum Ratings' may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational sections of this specification is not intended. Exposure to maximum rating conditions for extended periods may affect device reliability.

‡ Notice: The device is not guaranteed to function outside its operating ratings.

Note 1: The maximum power dissipation must be derated at elevated temperatures and is dictated by T JMAX (maximum junction temperature), Ɵ JA (junction-to-ambient thermal resistance), and T A (ambient temperature). The maximum allowable power dissipation at any temperature is P DMAX = (T JMAX - T A )/ Ɵ JA or the number given in the Absolute Maximum Ratings, whichever is lower. For the LM4040 and LM4041, T JMAX = +125°C and the typical thermal resistance, when board-mounted, is +326°C/W for the SOT-23 package.

• 2: Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5 k Ω in series with 100 pF. The machine model is a 200 pF capacitor discharged directly into each pin.

NOTES: