MAX15103EWL+T - 3A LDO Regulator 1.7-5.5V | Analog Devices
MPN: MAX15103EWL+T ✓ ActiveMAX15103EWL+T Overview
An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input voltage is very close to the output voltage. LDOs are widely used as a final post-regulation stage after switching converters, where they attenuate high-frequency ripple and noise that the switching converter cannot fully suppress. Within the power management hierarchy, the MAX15103 belongs to the category of linear regulators, which sit under power management ICs in the broader semiconductor taxonomy. Because LDO regulators dissipate (VIN - VOUT) x IOUT as heat, they are best suited to low-voltage, high-current rails where the input-to-output headroom is small.
Key features of the MAX15103EWL+T include a foldback current limit for output-stage protection, internal p-channel pass transistor architecture for low dropout operation, thermal shutdown protection, and a power-good output for sequencing in multi-rail systems. The device requires only small input and output capacitors and is designed for minimal external component count.
The internal architecture uses an advanced BiCMOS process with a p-channel MOSFET pass device, which permits true low-dropout operation and minimizes ground-pin current. The ±1.6% output accuracy is maintained across line, load, and temperature variations, ensuring tight regulation for downstream digital loads such as ASICs, FPGAs, and high-speed SerDes. The foldback current limit protects the regulator by reducing the output current during short-circuit or overload events rather than abruptly latching off, allowing recovery when the fault clears.
Typical applications include networking and datacom systems, server point-of-load regulation, DDR memory VTT termination, FPGA and ASIC core supplies, and distributed power architectures in telecom equipment. The wide input range of 1.7V to 5.5V makes the device directly compatible with both 3.3V and 5V intermediate bus voltages.
When designing with the MAX15103, ensure that PCB layout provides adequate copper thermal relief on the WLP land pads. Although the part is rated for 3A, thermal dissipation is highly layout-dependent; using a 4-layer board with thermal vias beneath the WLP balls is recommended for continuous full-load operation.
This page synthesizes distributor pricing, drop-in alternatives, application guidance, and practical design notes that are not consolidated in the manufacturer datasheet.
Drop-in alternatives for MAX15103EWL+T — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
MAX15103EWL+
✅ Drop-In📋 Reference alternative (not in catalog)
MAX15103EWL+T7N
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MAX15102EWL+T
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MAX15103EWL+T Maximum Ratings & Electrical Characteristics
| Manufacturer | Analog Devices / Maxim Integrated |
| Part Number | MAX15103EWL+T |
| Function | LDO Linear Voltage Regulator |
| Output Configuration | Positive, Adjustable |
| Number of Outputs | 1 |
| Input Voltage Range | 1.7 V to 5.5 V |
| Output Voltage Range | 0.6 V to 5.2 V |
| Maximum Output Current | 3 A |
| Output Accuracy | ±1.6% |
| Dropout Voltage | < 200 mV at 3 A full load |
| Pass Transistor Topology | Internal P-Channel MOSFET |
| Current Limit | Foldback |
| Package | 15-WLP (Wafer Level Package), 2.7 mm x 1.6 mm |
| Package Code | WLP-15 / VFBGA-15 |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
MAX15103EWL+T Pin Configuration
| Pin A1 | IN — Input voltage supply |
| Pin A2 | IN — Input voltage supply |
| Pin A3 | IN — Input voltage supply |
| Pin B1 | GND — Ground |
| Pin B2 | GND — Ground |
| Pin B3 | SET — Feedback voltage setting resistor divider node |
| Pin C1 | OUT — Regulated output voltage |
| Pin C2 | OUT — Regulated output voltage |
| Pin C3 | OUT — Regulated output voltage |
| Pin D1 | EN — Active-high enable input |
| Pin D2 | PGOOD — Power-good open-drain output |
| Pin D3 | NC — Not connected (per datasheet) |
| Pin E1 | OUT — Regulated output voltage |
| Pin E2 | OUT — Regulated output voltage |
| Pin E3 | GND — Ground |
Typical Applications
MAX15103EWL+T is suitable for 6 applications: Networking and Datacom Point-of-Load, Server DDR Memory VTT Termination, FPGA and ASIC Core Voltage Supply, Telecom Distributed Power Architecture, Industrial Embedded System Power, Test and Measurement Equipment.
Networking and Datacom Point-of-Load
The MAX15103EWL+T is optimized for networking and datacom systems where it sits on the point-of-load rail feeding ASICs, FPGAs, and switch ASICs. Its 1.7V to 5.5V input range accepts the common 3.3V or 5V intermediate bus voltage, while its 3A output capability supports high-current digital loads. The internal P-channel pass transistor provides <200 mV dropout at full 3A load, allowing low headroom operation. Unlike a switching converter, the LDO adds no switching noise to the rail, which is critical for SerDes and high-speed I/O performance. Use a 4-layer PCB with thermal vias to dissipate up to 1-2W continuous.
Recommended
Server DDR Memory VTT Termination
DDR memory requires a tightly-regulated VTT termination supply that tracks VDDQ/2 at high current. The MAX15103EWL+T with its 0.6V reference and ±1.6% output accuracy can be configured to provide VTT by tying the feedback divider to VDDQ. Its 3A current capability handles the parallel termination current demanded by DDR3/DDR4 memory banks under full read/write load. The LDO's low output noise is well below the DDR VTT tolerance, and its fast transient response handles load steps during memory bursts. Place output capacitors close to the load to optimize AC transient performance.
Recommended
FPGA and ASIC Core Voltage Supply
The MAX15103EWL+T provides a clean, low-noise core rail for FPGAs and ASICs that require sub-1V to 1.8V supplies at multi-amp currents. With the adjustable output set down to 0.6V, the part can directly power modern 28nm and 16nm FPGA core domains. The 3A current capability supports medium-density FPGAs, while the 15-WLP package (2.7 mm x 1.6 mm) fits directly beneath the device being powered. Foldback current limit protects against soldering shorts during board bring-up. Decouple with 22uF ceramic output capacitance for optimum transient response to logic load steps.
Recommended
Telecom Distributed Power Architecture
In telecom base-station and router distributed power architectures, the MAX15103EWL+T serves as the local post-regulator that converts a 3.3V or 5V intermediate bus down to a load-specific voltage. The 200 mV dropout at 3A lets the design operate from a tightly-managed bus while maintaining high efficiency at the load. Its ±1.6% output accuracy supports sensitive RF and mixed-signal circuitry downstream. The LDO is paired with an upstream switching converter such as the LT8640EUDC to handle the bulk power conversion while the MAX15103 cleans up switching ripple.
Recommended
Industrial Embedded System Power
Industrial embedded controllers and HMI panels require robust 3.3V or 5V rails that survive wide input transients from 24V backplane systems. The MAX15103EWL+T is best suited here as a post-regulator downstream of a wide-input switching converter, providing clean secondary rails for MCUs and digital I/O. Its foldback current limit and thermal shutdown protect the system from output faults. The 15-WLP package enables placement directly under the load IC on a 4-layer PCB, minimizing loop inductance and improving transient response to motor-drive or relay-switching events.
Recommended
Test and Measurement Equipment
Test and measurement instruments require low-noise, high-current rails to drive ADCs, DACs, and precision analog front-ends. The MAX15103EWL+T's <200 mV dropout and 3A output capacity make it an excellent post-regulator after a switching preregulator in bench instruments, oscilloscopes, and signal analyzers. The ±1.6% accuracy is adequate for many measurement applications, while the small WLP package permits placement adjacent to noise-sensitive analog ICs. Pair with bulk decoupling of at least 22uF ceramic to handle the dynamic load of ADC sample-and-hold circuits.
Recommended
Recommended Products Summary
Engineering reference data for MAX15103EWL+T — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MAX15103EWL+ | MAX15103EWL+T7N | MAX15102EWL+T |
|---|---|---|---|---|
| Package | 15-WLP (2.7x1.6 mm) | 15-WLP (2.7x1.6 mm) - same | 15-WLP (2.7x1.6 mm) - same | 15-WLP (2.7x1.6 mm) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Output Current | 3 A | 3 A | 3 A | 1 A |
| Input Voltage Range | 1.7 V to 5.5 V | 1.7 V to 5.5 V | 1.7 V to 5.5 V | 1.7 V to 5.5 V |
| Output Voltage Range | 0.6 V to 5.2 V | 0.6 V to 5.2 V | 0.6 V to 5.2 V | 0.6 V to 5.2 V |
| Output Accuracy | ±1.6% | ±1.6% | ±1.6% | ±1.6% |
| Packaging Format | Tape & Reel | Tray | Tape & Reel (alt orientation) | Tape & Reel |
Key Differentiators
- Highest output current in WLP-15 class for Analog Devices LDOs (vs MAX15102EWL+T)
- WLP-15 footprint enables direct placement under load ICs (vs TPS7A3001DRLR (MSOP-10))
- Single-source same-die tape-and-reel variant for production (vs MAX15103EWL+ (tray version))
Design Notes
Estimated: At VIN=5V, VOUT=3.3V, and 3A load, the MAX15103 dissipates approximately (5-3.3)*3 = 5.1W. The 15-WLP package has very limited PCB thermal coupling (theta_JA is highly layout-dependent); a 4-layer board with thermal vias directly beneath all GND and OUT balls is required for reliable full-load operation. Without proper thermal design, expect significant derating or thermal shutdown under sustained 3A load.
Place input and output ceramic capacitors (recommended 22uF X7R each) within 1-2 mm of the WLP balls. Use a star-ground connection from the B1/B2 GND balls to the system ground plane. Avoid routing high-current paths through thin traces; use copper pours under the OUT and IN balls to spread heat and reduce voltage drop. The exposed die-pad-style WLP balls should have multiple thermal vias to inner ground/power planes.
Do not exceed 5.5V on the input. Ensure the SET divider uses 1% tolerance resistors to maintain the ±1.6% output accuracy spec. The EN pin must not be left floating - tie it high through a 100k resistor for always-on operation. PGOOD is open-drain and requires a pull-up resistor (typically 10k to 100k) to either IN or OUT. WLP packages are moisture-sensitive - observe MSL handling procedures.
Compliance Information
RoHS compliance confirmed via Analog Devices product page. AEC-Q100 not stated - this part is targeted at networking/datacom/commercial-industrial use. REACH and halogen-free status should be verified via the manufacturer compliance certificate.
