Overview
The LM2937IMP-12 is a positive voltage regulator produced by Texas Instruments, capable of supplying up to 500 mA of load current. This low dropout regulator utilizes a PNP power transistor to achieve a low dropout voltage characteristic, typically 0.5 V at full rated load current. The device is fully specified for operation over a wide temperature range of −40°C to 125°C and includes special circuitry to minimize quiescent current, typically only 10 mA with a full 500-mA load current when the input to output voltage differential is greater than 3 V.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Output Voltage | TA = TJ = 25°C, 5 mA ≤ IOUT ≤ IOUT(MAX) | 11.64 | 12 | 12.36 | V |
| Line Regulation | (VOUT + 2 V) ≤ VIN ≤ 26 V, IOUT = 5 mA | 36 | 120 | mV | |
| Load Regulation | 5 mA ≤ IOUT ≤ IOUT(MAX) | 12 | 120 | mV | |
| Quiescent Current | (VOUT + 2 V) ≤ VIN ≤ 26 V, IOUT = 5 mA | 2 | 10 | mA | |
| Dropout Voltage | IOUT = IOUT(MAX) | 0.5 | 1 | V | |
| Short-circuit Current | 0.6 | 1 | A | ||
| Maximum Operational Input Voltage | 26 | V | |||
| Reverse DC Input Voltage | VOUT ≥ −0.6 V, RL = 100 Ω | −15 | −30 | V | |
| Reverse Transient Input Voltage | tr < 1 ms, RL = 100 Ω | −50 | −75 | V |
Key Features
- Fully specified for operation over −40°C to 125°C
- Output current in excess of 500 mA
- Output trimmed for 5% tolerance under all operating conditions
- Typical dropout voltage of 0.5 V at full rated load current
- Wide output capacitor ESR range, up to 3 Ω
- Internal short circuit and thermal overload protection
- Reverse battery protection
- 60-V input transient protection
- Mirror image insertion protection
Applications
- Automotive systems, including protection against reverse battery connections, two-battery jumps, and up to 60-V/−50-V load dump transients
- Industrial control systems
- Point-of-load regulation
Q & A
- What is the maximum output current of the LM2937IMP-12? The LM2937IMP-12 can supply up to 500 mA of load current.
- What is the typical dropout voltage of the LM2937IMP-12? The typical dropout voltage is 0.5 V at full rated load current.
- What is the operating temperature range of the LM2937IMP-12? The device is fully specified for operation over −40°C to 125°C.
- Does the LM2937IMP-12 have built-in protection features? Yes, it includes internal short circuit and thermal overload protection, reverse battery protection, and 60-V input transient protection.
- What types of applications is the LM2937IMP-12 suited for? It is ideally suited for automotive, industrial control, and point-of-load regulation applications.
- What is the maximum operational input voltage for the LM2937IMP-12? The maximum operational input voltage is 26 V.
- Does the LM2937IMP-12 require an output bypass capacitor for stability? Yes, the device requires an output bypass capacitor for stability, and it is stable for all ESR below 3 Ω.
- What is the quiescent current of the LM2937IMP-12? The quiescent current is typically 10 mA with a full 500-mA load current when the input to output voltage differential is greater than 3 V.
- Is the LM2937IMP-12 protected against reverse transient input voltages? Yes, it can withstand reverse transient input voltages up to −50 V.
- What are the available package types for the LM2937IMP-12? The LM2937 is available in TO-220, SOT-223, and TO-263 packages.
