Part: LM4040/LM4041

Type: Precision Micropower Shunt Voltage Reference

Description: Precision micropower shunt voltage reference available in fixed reverse-breakdown voltages of 1.225V, 2.500V, 4.096V, and 5.000V, or an adjustable version, featuring low dynamic impedance and operating currents from 60 μA to 15 mA.

Operating Conditions:

• Operating temperature: -40 to +85 °C
• Reverse current (LM4040-2.5): 60 μA to 15 mA
• Output voltage range (LM4041-ADJ): 1.24V to 10V

Absolute Maximum Ratings:

• Max reverse current: 20 mA
• Max forward current: 10 mA
• Max output voltage (LM4041-ADJ): 15V
• Max junction temperature: +125 °C

Key Specs:

• Reverse-Breakdown Voltage (LM4040-2.5C): 2.500 V (typ) at I_R = 100 μA, T_A = +25°C
• Reverse-Breakdown Voltage Tolerance (LM4040-2.5C): ±12 mV (max) at I_R = 100 μA, T_A = +25°C
• Minimum Operating Current (LM4040-2.5C): 60 μA (max)
• Maximum Operating Current (LM4040 versions): 15 mA
• Average Reverse-Breakdown Voltage Temperature Coefficient (LM4040-2.5C): ±100 ppm/°C (max) at I_R = 1 mA
• Reverse Dynamic Impedance (LM4040-2.5C): 0.9 Ω (max) at I_R = 1 mA, f = 120 Hz, T_A = +25°C
• Wideband Noise (LM4040-2.5C): 35 μV RMS (typ) at I_R = 100 μA, 10 Hz ≤ f ≤ 10 kHz
• Output Voltage Range (LM4041-ADJ): 1.24V to 10V

Features:

• 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

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

LM4040 SOT-23 Pinout

Notes

• This pinout is for the LM4040 fixed-voltage variants (LM4040-2.5, LM4040-4.1, LM4040-5.0).
• The LM4041-ADJ adjustable variant uses a different pin assignment (see Table 3-1 "Pin Number Adjustable" column): Pin 1 = FB, Pin 2 = +, Pin 3 = −.
• Pin 3 (NC) is not internally connected and should be left floating or connected to the anode (−).

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.

• Forward Current......................................................................................................................................................10 mA
• Maximum Output Voltage (LM4041-ADJ) ...................................................................................................................15V
• Power Dissipation (T A = +25°C; Note 1)..............................................................................................................306mW
• ESD Susceptibility (HBM; Note 2)..............................................................................................................................2 kV
• ESD Susceptibility (MM; Note 2)...............................................................................................................................200V
• Operating Ratings ‡
• Reverse Current (LM4040-2.5) .................................................................................................................60 μA to 15 mA
• Reverse Current (LM4040-4.1) .................................................................................................................68 μA to 15 mA
• Reverse Current (LM4040-5.0) .................................................................................................................74 μA to 15 mA
• Reverse Current (LM4041-1.2) .................................................................................................................60 μA to 12 mA
• Reverse Current (LM4041-ADJ) ...............................................................................................................60 μA to 12 mA
• Output Voltage Range (LM4041-ADJ) ......................................................................................................... 1.24V to 10V

† 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: