NJW4132U2-A - 40V 1.75A Boost Converter IC | Nisshinbo
MPN: NJW4132U2-A ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.56 | $25.60 |
| 100 | $2.27 | $227.00 |
| 500 | $2.04 | $1,020.00 |
| 1,000 | $1.81 | $1,810.00 |
NJW4132U2-A Overview
A boost converter (also called a step-up switching regulator) is a switching power topology that uses an inductor, a power switch, and a rectifier diode to deliver an output voltage higher than the input. The NJW4132U2-A falls within the broader DC-DC switching regulator category (DC-DC > switching regulator > boost converter > PMIC) and is intended for applications where the input must be raised to a higher rail without the heat penalty of a linear regulator. Compared with a linear LDO, a boost converter trades lower efficiency for much smaller size and far less heat dissipation at high VIN-to-VOUT ratios.
Key features include 45V absolute maximum input rating, 1.75A internal MOSFET current capability, high switching frequency that allows the use of small low-ESR MLCC output capacitors, integrated soft-start, cycle-by-cycle overcurrent protection, thermal shutdown, and an enable/shutdown pin for power sequencing. The exposed-pad SOT-89-5/6 footprint keeps the part area minimal while providing adequate thermal dissipation for sub-3W designs on a 1-square-inch copper pour.
Typical applications include driving strings of white LEDs from a 12V or 24V rail, biasing industrial sensors from a 24V PLC supply, generating local 15V or ±12V rails from a single-cell Li-ion pack, and supplying LCD bias generators in point-of-sale and metering equipment. The wide input range also supports USB-PD and automotive 12V battery systems.
When designing with the NJW4132U2-A, place the input capacitor, output capacitor, boost inductor, and catch diode as close to the IC as possible, and follow the manufacturer recommended land pattern to keep switching-node copper area short and quiet. Keep the feedback traces away from the SW node and use the EN pin to control inrush and standby current.
Drop-in alternatives for NJW4132U2-A — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
NJW4132U2-B-TE2
✅ Drop-In📋 Reference alternative (not in catalog)
NJW4132U1-A-TE2
✅ Drop-In📋 Reference alternative (not in catalog)
NJW4132U2-A Maximum Ratings & Electrical Characteristics
| Topology | Boost (Step-Up) Switching Regulator |
| Input Voltage Range | 4.5 V to 40 V |
| Absolute Maximum Input Voltage | 45 V |
| Output Voltage Range | Adjustable, 1 V to ~38 V |
| Internal Switch Current | 1.75 A |
| Internal Power MOSFET | Integrated, 40 V rating |
| Output Current Capability | Up to 1.75 A (dependent on VIN-VOUT ratio) |
| Feedback Voltage | 1 V (adjustable via external resistor divider) |
| Enable Pin | Yes (active-high, shutdown control) |
| Soft-Start | Integrated |
| Protection Features | Cycle-by-cycle overcurrent protection, thermal shutdown |
| Operating Temperature Range | -40 C to +125 C |
| Package | SOT-89-5/6 (with exposed thermal pad) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
NJW4132U2-A Pin Configuration
| Pin 1 | SW — Switch node - connect to boost inductor |
| Pin 2 | GND — Ground reference |
| Pin 3 | FB — Feedback (1V reference) - resistor divider to VOUT |
| Pin 4 | EN — Enable input (active-high) |
| Pin 5 | VIN — Input supply (4.5V to 40V) |
Typical Applications
NJW4132U2-A is suitable for 6 applications: Industrial 24V Sensor Bias Supply, White LED String Driver from 12V Rail, USB-PD / Battery Boost to 12V or 20V Rail, Automotive 12V Body Electronics Boost, LCD Bias Generator for Metering Equipment, IoT Edge Node Local Rail Boost.
Industrial 24V Sensor Bias Supply
The NJW4132U2-A's 40V input and 1.75A switch current let it boost a 24V industrial PLC rail to 30-36V for biasing strain-gauge and pressure sensors that need higher compliance. With 85-93% efficiency in typical 24V-to-30V boost operation, the part dissipates far less heat than a linear regulator would at the same delta, fitting in a sealed sensor housing on a 0.5-1 sq-in copper pour.
Recommended
White LED String Driver from 12V Rail
Driving 3-8 series white LEDs from a 12V supply requires stepping up to ~25-30V at 100-350mA per string - exactly the NJW4132U2-A's sweet spot. The 4.5V-40V VIN range tolerates automotive cold-crank and load-dump transients; the high switching frequency lets designers use a small chip inductor plus a single 10uF MLCC, avoiding bulky electrolytics.
Recommended
USB-PD / Battery Boost to 12V or 20V Rail
For portable devices that must produce a 12V or 20V rail from a 1S Li-ion (3.0-4.2V) or USB-PD source (5-20V), the NJW4132U2-A's 4.5V-40V VIN and adjustable VOUT make it flexible across charging profiles. The integrated soft-start and cycle-by-cycle current limit protect the battery under hot-plug events, while the EN pin enables load-disconnect for sleep modes.
Recommended
Automotive 12V Body Electronics Boost
The NJW4132U2-A's 45V abs-max input covers 12V automotive load-dump per ISO 7637-2, allowing direct connection to the battery rail without an external TVS in many designs. Boosting to 15-18V provides headroom for HVAC actuators, infotainment audio amplifiers, and CAN-bus isolators that need a stable rail above cranking transients. Note the part is not AEC-Q100 qualified.
Recommended
LCD Bias Generator for Metering Equipment
LCD panels in electricity meters and POS terminals need +/-15V or +20V bias rails generated from a single 5V or 12V system rail. The NJW4132U2-A produces the positive rail cleanly while the small SOT-89-5/6 footprint fits inside cramped meter enclosures. The 1.75A switch capability supports multi-segment displays without flicker under load steps.
Recommended
IoT Edge Node Local Rail Boost
Battery- or PoE-powered IoT gateways often need a 12V or 24V local rail to drive RS-485 transceivers, analog front ends, or sensor excitation. The NJW4132U2-A's EN pin supports sleep-mode current reduction for battery-powered nodes, and the wide VIN window lets the same design run from either 3.6V Li-ion or 12V PoE-derived input.
Recommended
Recommended Products Summary
Engineering reference data for NJW4132U2-A — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | NJW4132U2-B-TE2 | NJW4132U1-A-TE2 |
|---|---|---|---|
| Package | SOT-89-5/6 | SOT-89-5/6 - same | SOT-89-5/6 - same |
| Brand | Nisshinbo Micro Devices | Nisshinbo Micro Devices | Nisshinbo Micro Devices |
| Input Voltage Range | 4.5 V to 40 V | 4.5 V to 40 V | 4.5 V to 40 V |
| Absolute Maximum VIN | 45 V | 45 V | 45 V |
| Switch Current | 1.75 A | 2.25 A | 1 A (lower-current variant) |
| Output Voltage Range | Adjustable, 1 V to ~38 V | Adjustable, 1 V to ~38 V | Adjustable, 1 V to ~38 V |
| Enable Pin | Yes (active-high) | Yes (active-high) | Yes (active-high) |
Key Differentiators
- Higher 1.75A switch current than typical SOT-89-5/6 boost ICs (vs TPS61040 (typical 0.4-0.5A in SOT-23-5))
- 40V continuous / 45V abs-max input supports industrial 24V buses (vs NJW4132U1-A-TE2 (lower-current variant))
- Same-package upgrade path via -B variant (vs NJW4132U2-B-TE2)
Design Notes
Place the input bypass capacitor, output capacitor, boost inductor, and catch diode as close to the IC as possible. Keep the SW node copper area minimal and away from the FB trace to avoid noise coupling. Use a 1-square-inch copper pour under the SOT-89-5/6 exposed pad for heat removal; the pad must be soldered to the pour, not floating, to achieve rated thermal performance.
Estimated: at VIN=12V, VOUT=24V, IOUT=0.5A continuous, the NJW4132U2-A dissipates approximately P = (VOUT/VIN - 1) * VOUT/eta * IOUT -> roughly 0.7W at 90% efficiency. The SOT-89-5/6 with a 1-sq-in copper pour has theta_JA around 50 C/W, so junction temperature rises ~35 C above ambient - acceptable in most industrial environments. Continuous loads above 1A need a larger copper pour or airflow.
Do not exceed the 45V absolute maximum on VIN, even during transient events - add a TVS or input clamp if the source is a long cable or inductive load. The feedback resistors should use 1% tolerance or better to keep output voltage accuracy; choose RFB-top in the 10-100 kohm range to balance quiescent-current loss against noise pickup. Never leave the EN pin floating - tie it to VIN through a 100 kohm resistor or drive it with the system MCU.
Compliance Information
RoHS compliant per Nisshinbo product page. Not AEC-Q100 qualified - select AEC-Q100 boost IC for automotive. REACH compliance assumed by EU distribution; halogen-free status not explicitly stated.
