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onsemi FAN53741UC108X
- Part No.:
- FAN53741UC108X
- Manufacturer:
- onsemi
- Package:
- 6-UFBGA, WLCSP
- Datasheet:
-
FAN53741UC108X.pdf
- Description:
- IC REG BUCK ADJ 1.3A 6WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:3,134
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Product details
Overview
FAN53741UC108X from onsemi is a synchronous buck regulator delivering programmable 0.6 V to 3.3 V output at up to 1300 mA from 2.3 V–5.5 V input, operating at 2.5 MHz fixed frequency with PFM/PWM auto-mode switching and integrated I²C interface for voltage and current limit configuration - deployed in compact wearable power rails.
For engineers reviewing the FAN53741UC108X datasheet, pinout, applications, or equivalent options, key selection criteria include its 6-bump WLCSP package, 60 µA PFM quiescent current, ±20 mV output accuracy below 2.0 V, 97% peak efficiency, and I²C-programmable current limit (530–2150 mA in 108 mA steps).
Technical Context
The FAN53741UC108X implements an auto-mode control architecture that dynamically transitions between Pulse Frequency Modulation (PFM) at light loads (<124 mA typical) and fixed-frequency PWM (2.25–2.75 MHz) at higher loads, maintaining high efficiency across 1 mA–1300 mA output range. Its proprietary synchronous rectification uses integrated PMOS (125 mΩ) and NMOS (82 mΩ) switches.
Protection is implemented via hardware-based UVLO (2.15 V rise threshold), thermal shutdown (150°C activation), overcurrent detection (programmable 530–2150 mA), and active pull-down with selectable 50/100/200 Ω strength - all monitored and reported through I²C fault registers (0x01–0x02).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.3 V to 5.5 V - supports single-cell Li-ion, Li-polymer, and regulated 3.3 V/5 V rails without external LDO pre-regulation. |
| Output Voltage Range | 0.6 V to 3.3 V in 25 mV steps via I²C - enables precise core voltage scaling for ARM Cortex-M, Bluetooth SoCs, and sensor ADCs. |
| Max Output Current | 1300 mA - sufficient for RF transceivers, display drivers, and multi-core microcontrollers in space-constrained wearables. |
| Switching Frequency | 2.5 MHz nominal (2.25–2.75 MHz) - allows use of ultra-small 0.47 µH inductor and 10 µF 0402 output capacitor, achieving 5.24 mm² total solution size. |
| Quiescent Current | 60 µA in PFM mode - extends battery life in always-on health monitoring and sensor wake-up circuits. |
| Efficiency | 97% peak at 300 mA - minimizes thermal dissipation in sealed enclosures such as smart watches and earbuds. |
| Output Accuracy | ±20 mV (0.6–2.0 V) or ±1% (2.0–3.3 V) - ensures stable operation of low-voltage logic and analog front-ends without external trimming. |
Pinout & Package
Package: 6-bump Wafer-Level Chip-Scale Package (WLCSP), 0.4 mm pitch, 1.38 mm × 0.94 mm × 0.625 mm, case 567UH, Pb-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | SDA | I²C serial data line - must be pulled up externally; enables dynamic voltage/current limit reconfiguration without power cycle. |
| A2 | VIN | Main input supply connection - requires local 2.2 µF ceramic capacitor to GND to suppress high-frequency switching noise. |
| B1 | SCL | I²C serial clock line - must be pulled up externally; supports Fast Mode (400 kHz) and Fast-Plus Mode (1 MHz). |
| B2 | SW | Switching node - connects directly to inductor's SW pad; carries high di/dt pulses requiring short, low-inductance PCB routing. |
| C1 | FB | Feedback input - senses output voltage divider (internal); no external resistor network required for fixed-output variants. |
| C2 | GND | Power and signal reference - must be connected to solid ground plane with multiple thermal vias to manage 125 °C/W junction-to-ambient thermal resistance. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Soft-Start | Limits inrush current to <150 mA during startup - prevents brown-out in battery-powered systems with weak source impedance. |
| I²C Programmable Current Limit | 530–2150 mA in 108 mA steps - allows safe operation with diverse inductors and load profiles without hardware change. |
| Active Pull-Down | Selectably 50/100/200 Ω internal discharge path - ensures rapid VOUT collapse during disable or negative transient events. |
| Load Transient Response | ±60 mV deviation for 100 mA ↔ 1200 mA step (5 µs edge) - maintains regulation during burst-mode wireless transmission or sensor sampling. |
| Protection Coverage | UVLO, OCP, thermal shutdown, startup timeout, and VOUT short detection - all reported via readable fault registers (0x01–0x02). |
Applications
| Smart Wearables Power | Health Sensor Hub |
|---|---|
Use Scenario: Powering ultra-thin smart bands with optical heart-rate sensor, accelerometer, and BLE radio. IC Role / Device Role / Timing Role: Primary system buck regulator supplying 1.8 V to BLE SoC and 3.3 V to analog sensor front-end. Use Value: 60 µA quiescent current extends 7-day battery life; 2.5 MHz switching avoids audible noise in proximity to ear canal. |
Use Scenario: Compact ECG patch with dual ADCs, ultra-low-power MCU, and energy-harvesting PMIC interface. IC Role / Device Role / Timing Role: Configurable output rail generator enabling adaptive voltage scaling for analog signal chain and digital processing blocks. Use Value: I²C-programmable 0.6–3.3 V range supports both sub-1 V precision ADC references and 3.3 V digital I/O - eliminating discrete LDOs. |
| RF Module Supply | Smart Watch Core Rail |
Use Scenario: LTE-M/NB-IoT modem module in industrial asset tracker with tight thermal envelope. IC Role / Device Role / Timing Role: High-efficiency 3.3 V supply for PA bias and transceiver IC, synchronized to transmit bursts. Use Value: 97% peak efficiency reduces heat generation by >40% vs. linear regulators; fast load transient response prevents TX distortion during packet ramp-up. |
Use Scenario: Dual-core application processor in circular smart watch with always-on display and haptic feedback. IC Role / Device Role / Timing Role: Main 1.2 V core supply with dynamic voltage scaling via I²C register writes during CPU frequency transitions. Use Value: 25 mV output resolution enables precise DVFS tuning; soft-start prevents display flicker during cold boot. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS6286518RQYR | Fixed 1.8 V output; no I²C interface; 2.0 MHz switching; 1.2 A max output | Not suitable for voltage-scaling or multi-rail systems requiring programmability | Select only when fixed 1.8 V output suffices and I²C configurability is unnecessary. |
| RTQ2132BGQW | 3.0 A output; 2.4 MHz switching; I²C voltage programming (0.3–1.8 V); no current limit programming | Higher current capability but narrower output range - unsuitable for 3.3 V sensor rails | Prefer for high-current, low-voltage cores; avoid where 3.3 V or >2.0 V outputs are needed. |
Compared with TPS6286518RQYR and RTQ2132BGQW, the FAN53741UC108X uniquely combines full 0.6–3.3 V I²C programmability, 1300 mA capability, and 60 µA quiescent current in a 1.38 mm × 0.94 mm WLCSP - making it optimal for multi-rail, battery-sensitive wearables where flexibility and footprint are critical.
Availability
FAN53741UC108X is available at Aetrix Electronics and suitable for smart wearables, health sensor hubs, and RF module power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing for medical-grade and consumer electronics production.
Supply support for FAN53741UC108X includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The FAN53741UC108X belongs to onsemi's high-frequency synchronous buck regulator product line, designed specifically for space-constrained, battery-operated portable electronics demanding ultra-low quiescent current and I²C configurability.
FAQ
What is the recommended input and output capacitor configuration for FAN53741UC108X?
The FAN53741UC108X requires a 2.2 µF X5R 0402 ceramic capacitor (e.g., TDK C1005X5R0J225M050BC) placed directly between VIN and GND, and a 10 µF X5R 0402 output capacitor (e.g., TDK C1005X5R0J106M050BC) connected from VOUT to GND. These values are validated for stable operation, minimal ripple (<12 mV at 200 mA), and optimal transient response per the datasheet's Recommended External Components table.
Does FAN53741UC108X support dynamic voltage scaling (DVS) during operation?
No, the FAN53741UC108X does not support true dynamic voltage scaling. While its output voltage is programmable from 0.6 V to 3.3 V in 25 mV steps via I²C register 0x04 (VSEL), voltage transitions occur as single-step changes with slew rates dependent on output capacitance and load current - not synchronized to processor clock or performance states.
What protection features are implemented in FAN53741UC108X and how are they reported?
The FAN53741UC108X integrates UVLO, overcurrent protection (OCP), thermal shutdown (TSP), startup timeout, and VOUT short detection. All faults are latched and reported in real time via I²C registers: Fault Flag (0x01) provides latched status, while Fault Live (0x02) gives instantaneous comparator outputs - enabling robust system-level fault handling without external supervision circuitry.
Can FAN53741UC108X operate with a 1.8 V input supply?
No - the absolute minimum input voltage for FAN53741UC108X is 2.3 V per the Recommended Operating Conditions table. Operation below 2.3 V triggers under-voltage lockout (UVLO), disabling regulation. At 2.3 V input, the device can still deliver its full 1300 mA output only if the programmed VOUT is ≤1.2 V; higher output voltages reduce achievable load current due to duty-cycle limitations.
What is the thermal performance of FAN53741UC108X in its WLCSP package?
The FAN53741UC108X has a simulated junction-to-ambient thermal resistance (θJA) of 125 °C/W on a standard 4-layer 2s2p PCB with no thermal vias. In practice, using a solid ground pour tied to internal layers via ≥6 thermal vias under the GND bump significantly improves heat dissipation - enabling continuous 1300 mA operation at +85°C ambient when layout guidelines in the datasheet's "Recommended Layout" section are followed.
FAN53741UC108X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 6-UFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.3V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 3.3V
- Current - Output:
- 1.3A
- Frequency - Switching:
- 2.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WLCSP (1.38x0.94)
FAN53741UC108X FAQ
1.How can I place an order for FAN53741UC108X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN53741UC108X on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for FAN53741UC108X reliable?
The price and inventory of FAN53741UC108X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN53741UC108X is usually 5 days.
3.What payment methods are accepted for FAN53741UC108X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN53741UC108X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN53741UC108X?
FAN53741UC108X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN53741UC108X order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for FAN53741UC108X?
For technical support, including FAN53741UC108X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN53741UC108X requirements.
6.How does Aetrix verify that FAN53741UC108X is sourced from the original manufacturer or authorized distributors?
All FAN53741UC108X products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that FAN53741UC108X meets industry standards.
7.What is the process for return or replacement of FAN53741UC108X?
All FAN53741UC108X units undergo pre-shipment inspection (PSI). If there is an issue with FAN53741UC108X, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The FAN53741UC108X part is unused and in its original packaging.
Return procedure for FAN53741UC108X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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