INFR4330 / INFR4500
The INFR4xx0 series are automotive grade 1, low quiescent current, low-dropout linear regulators (LDO) supporting a wide input voltage range up to 40 V with a maximum output current of 150 mA, delivering ±2.5% output voltage accuracy. The family features input undervoltage lockout (UVLO) with hysteresis, high-voltage enable control, internal current limiting with reverse overload protection, and overtemperature shutdown. Loop stability is maintained with a minimum 2.2 µF ceramic output capacitor, making these devices an excellent choice for energy-efficient designs in automotive and industrial environments.
Product Overview
| Parameter | Value |
|---|---|
| Input Voltage Range (VIN) | 4 – 40 V |
| Output Voltage | 3.3 V (INFR4330) / 5 V (INFR4500) |
| Output Voltage Accuracy | ±2.5% (over temperature, line and load) |
| Maximum Output Current | 150 mA |
| Quiescent Current (IQ) | 4.2 µA (typ., IOUT = 0 mA) |
| Ground Current (IGND) | 110 µA @10 mA; 731 µA @150 mA (typ.) |
| Shutdown Current | 483 nA (typ., VEN = 0 V) |
| Dropout Voltage (VDO) | INFR4330: 637 mV @150 mA; INFR4500: 447 mV @150 mA (typ.) |
| Startup Time | 148 µs (typ.) |
| Power Supply Rejection | 66 – 109 dB (10 Hz – 1 kHz, typ.) |
| Output Capacitor | 2.2 – 100 µF (stable with ceramic) |
| Ambient Operating Temperature | -40 – 125 °C |
| Automotive Qualification | AEC-Q100 Grade 1 |
Series Part Numbers
| Part Number | Package | Output Voltage (V) | Device Marking |
|---|---|---|---|
| INFR4330SOT235 | SOT-23 (5-pin) | 3.3 | TBD |
| INFR4500SOT235 | SOT-23 (5-pin) | 5 | TBD |
| INFR4330SOT893 | SOT-89 (3-pin) | 3.3 | TBD |
| INFR4500SOT893 | SOT-89 (3-pin) | 5 | TBD |
Features & Benefits
Automotive Qualified
AEC-Q100 Grade 1 qualified, ambient operating temperature -40 °C to 125 °C, meeting automotive front-mount requirements
Ultra-Low Quiescent Current
Only 4.2 µA quiescent current and 483 nA shutdown current, significantly extending standby time in battery-powered equipment
Wide Input Voltage Range
4 V to 40 V wide input directly suits 12 V / 24 V automotive rails and industrial bus voltages, tolerant of load dump
Multiple Protection
UVLO with hysteresis, internal current limiting with reverse protection, and 165 °C overtemperature shutdown (OTSD)
High-Voltage Enable Pin
EN pin tolerates 40 V; shutdown below 0.7 V and startup above 1.6 V, allowing direct MCU control
Simplified External Design
A minimum 2.2 µF ceramic output capacitor maintains loop stability — no tantalum or electrolytic capacitor required
Compact Package Options
Available in 5-pin SOT-23 and 3-pin SOT-89 packages for space-constrained designs
Excellent PSRR
PSRR up to 109 dB at 10 Hz effectively suppresses input ripple, providing clean power for sensitive analog circuits
Typical Applications
Infotainment & Cluster
Power supply for head units, clusters and infotainment systems
Automotive Headlights
Headlamp driver and control module power
Battery Management
Low-power supply for BMS acquisition boards and monitoring units
Motor Drives
Auxiliary power for motor controllers and drivers
Telecom Applications
Secondary power conversion on telecom equipment boards
Industrial Control
Wide-input supply for industrial sensors and PLC modules
Resources
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