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onsemi FAN48623UC33X
- Part No.:
- FAN48623UC33X
- Manufacturer:
- onsemi
- Package:
- 16-UFBGA, WLCSP
- Datasheet:
-
FAN48623UC33X.pdf
- Description:
- IC REG BOOST PROG 2.5A 16WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
FAN48623UC33X from Fairchild Semiconductor is a 2500 mA synchronous TinyBoost® DC-DC boost regulator with true bypass mode, designed for Li-ion battery-powered portable systems requiring stable 3.3 V output from inputs as low as 2.5 V. It delivers up to 97% efficiency, integrates synchronous rectification and load disconnect, and supports GSM PA pulse loads up to 3.5 A at VIN = 3.1 V / VOUT = 3.4 V.
For engineers reviewing the FAN48623UC33X datasheet, pinout, applications, or equivalent options, this page provides verified technical context, exact package mapping (16-bump WLCSP), validated pin functions, confirmed electrical specs including ±4.0% output accuracy and 140–190 µA quiescent current in auto-bypass mode, and two real-world alternative parts with documented functional trade-offs.
Technical Context
The FAN48623UC33X operates in continuous conduction mode (CCM) at ~2.5 MHz under moderate-to-heavy loads and transitions to discontinuous conduction mode (DCM) at light loads to maintain high efficiency. Its current-mode modulator ensures fast transient response and smooth CCM/DCM handover.
Bypass behavior is precisely controlled: automatic entry occurs when VIN exceeds the target 3.3 V (with 30 mV hysteresis), and forced bypass is activated via the BYP pin. During bypass, both internal MOSFETs (Q1 and Q3) fully enhance to provide <100 mΩ VIN-to-VOUT path, while PG remains asserted only if thermal and voltage-drop conditions are met.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V (±4.0% accuracy over 0–2500 mA, 2.5 V ≤ VIN ≤ 3.2 V) |
| Max Continuous Output Current | 2500 mA at VIN = 2.5 V → VOUT = 3.3 V; enables single-cell Li-ion support down to brownout |
| Peak Pulse Current | 3.5 A for 1-slot GSM PA + PMIC supply simultaneously (VIN = 3.1 V, VOUT = 3.4 V) |
| Efficiency | Up to 97% at mid-load (e.g., 1500 mA, VIN = 3.0 V → 3.3 V), critical for battery runtime extension |
| Quiescent Current | 140–190 µA in auto-bypass mode (VIN = 3.6 V), enabling ultra-low-power standby in always-on subsystems |
| Input Voltage Range | 2.5 V to 4.5 V (recommended); supports full discharge curve of Li-ion (3.0–4.2 V nominal) |
| Switching Frequency | ~2.5 MHz in CCM; enables use of compact 0.47 µH inductor and 0603 capacitors |
Pinout & Package
Package: 16-bump, 1.81 mm × 1.81 mm, 0.4 mm pitch Wafer-Level Chip-Scale Package (WLCSP), with bumps down orientation and thermal vias recommended on PGND pads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 - EN | Enable control input | Active-high logic (VIH ≥ 1.05 V); must be driven by GPIO (not direct VIN tie); initiates linear startup sequence |
| A2 - PG | Open-drain power-good flag | Asserted HIGH after successful soft-start; de-asserted during fault, thermal shutdown (>125°C), or overload |
| A3/A4 - VIN | Main input power connection | Accepts 2.5–4.5 V Li-ion source; connects directly to input capacitor (10 µF, 0603) |
| B1 - VSEL | Output voltage select | Configures target VOUT during boost operation; tied HIGH/LOW or left floating per datasheet options (not used for FAN48623UC33X fixed 3.3 V) |
| B3/B4 - VOUT | Regulated output node | Delivers 3.3 V to system load; requires 44 µF total ceramic capacitance (2×22 µF, 0603) placed adjacent to PGND |
| C1 - BYP | Forced bypass mode control | Active-low input; pulls LOW to enter ultra-low-IQ bypass (6–12 µA); disables OCP/UVLO/OTP during bypass |
| C3/C4 - SW | Internal switching node | Connects to 0.47 µH inductor; carries high di/dt; requires short, wide trace and ground shielding per layout guidelines |
| D1 - AGND | Analog reference ground | Signal ground reference for internal regulation; must connect to PGND at single-point star node near CIN/COUT |
| D2–D4 - PGND | Power ground return | Primary return path for inductor current and output capacitor; requires thermal vias and large copper pour |
| B2/C2 - NC | No internal connection | Bumps present but unconnected; must be tied to PGND for mechanical stability and thermal relief |
Key Features
| Feature | Design Value |
|---|---|
| True Bypass Operation | VIN-to-VOUT path resistance <100 mΩ when VIN > 3.3 V, eliminating switching losses and reducing IQ to ≤12 µA |
| Synchronous Rectification | Integrated low-RDS(on) MOSFETs eliminate external Schottky diode, improving efficiency by 3–5% vs. asynchronous designs |
| True Load Disconnect | Internal isolation prevents reverse current flow from VOUT to VIN during shutdown or fault, protecting battery |
| Short-Circuit Protection | Valley-current limiting triggers at 4.7–5.3 A; fault restart timer (20 ms) prevents latch-up during sustained overload |
| Ultra-Low Quiescent Current | 4–12 µA in shutdown or forced bypass modes extends shelf life and standby time in IoT/sensor nodes |
Applications
| Smartphone RF Power Amplifier Supply | Portable Medical Sensor Hub |
|---|---|
Use Scenario: Delivering burst-mode 3.3 V power to 2G/3G/4G RF PAs during transmission slots while operating from a single Li-ion cell (3.0–4.2 V). IC Role / Device Role / Timing Role: Primary boost regulator with forced bypass capability during receive/idle phases to minimize system IQ. Use Value: Enables 3.5 A GSM PA pulses without brownout, while maintaining <190 µA quiescent draw in auto-bypass-extending talk time by >12% vs. LDO-based solutions. |
Use Scenario: Providing regulated 3.3 V to ultra-low-power MCU, BLE radio, and analog front-end in wearable ECG patch. IC Role / Device Role / Timing Role: System PMIC rail generator with seamless transition between boost and bypass to match battery voltage decay profile. Use Value: Maintains stable 3.3 V output across full Li-ion discharge (4.2 V → 2.8 V), eliminating need for secondary LDO and reducing BOM count by one component. |
| Tablet System PMIC Auxiliary Rail | Industrial Handheld Scanner |
Use Scenario: Generating clean 3.3 V for camera ISP and touch controller in tablet platform where main PMIC lacks sufficient current headroom. IC Role / Device Role / Timing Role: Secondary boost regulator with PG monitoring for system-level power sequencing and fault reporting. Use Value: PG signal enables host processor to detect output regulation failure before boot, preventing corrupted sensor initialization sequences. |
Use Scenario: Powering laser driver and image sensor in rugged handheld barcode scanner powered by removable Li-ion pack. IC Role / Device Role / Timing Role: High-reliability boost converter with thermal foldback (PG de-assertion at 125°C) and UVLO (2.35 V) for harsh environment operation. Use Value: Withstands repeated 500-ms 3.5 A laser pulses without thermal shutdown, while UVLO prevents erratic behavior during battery insertion/removal. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61230DRVR | Fixed 3.3 V, 3-A peak, 2.5-MHz sync boost; no bypass mode; higher IQ (25 µA typical in shutdown) | Lacks true bypass-requires external load switch for ultra-low-IQ standby; less suitable for battery-critical always-on functions | Choose when higher peak current (3 A) is required and bypass functionality is not needed; compatible 0603 passives but larger 2.0 × 2.0 mm QFN package |
| MAX8640YETA+ | Adjustable 2.5–5.5 V output, 2-A max, 3-MHz switching; includes I²C interface; no integrated bypass FETs | Requires external MOSFETs for bypass; adds complexity and board area; supports dynamic VOUT adjustment via I²C | Choose when programmable output voltage and telemetry are prioritized over size and simplicity; incompatible pinout and control scheme |
Compared with TPS61230DRVR and MAX8640YETA+, the FAN48623UC33X uniquely integrates true bypass with sub-12 µA forced-bypass IQ and a 1.81 mm × 1.81 mm WLCSP footprint-making it optimal for space-constrained, battery-sensitive portable devices where seamless VIN-following operation is mandatory.
Availability
FAN48623UC33X is available at Aetrix Electronics and suitable for smartphone RF power amplifiers, portable medical sensor hubs, tablet auxiliary rails, and industrial handheld scanners requiring stable component supply with guaranteed long-term availability.
Supply support for FAN48623UC33X 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
Fairchild Semiconductor (now part of ON Semiconductor) is a global leader in power management and analog ICs, specializing in high-efficiency, miniaturized solutions for portable and battery-powered electronics.
The FAN48623UC33X belongs to Fairchild's TinyBoost® family-designed specifically to extend runtime and enable new battery chemistries in ultra-thin mobile devices by delivering high current from deeply discharged Li-ion cells.
FAQ
What is the exact output voltage tolerance of the FAN48623UC33X under full load?
The FAN48623UC33X guarantees ±4.0% output voltage accuracy across 0–2500 mA load, 2.5 V ≤ VIN ≤ 3.2 V, and –40°C to +85°C ambient. This is measured at DC and PWM (CCM) operation per datasheet Table 1, ensuring reliable 3.3 V rail generation even under worst-case battery sag and temperature extremes.
Does the FAN48623UC33X require external components for basic operation?
Yes-the FAN48623UC33X requires four external components: a 0.47 µH inductor (2520 case), a 10 µF input capacitor (0603), and two 22 µF output capacitors (0603). No compensation network or feedback resistors are needed due to its fixed 3.3 V output and internal compensation.
How does the FAN48623UC33X handle thermal overload?
When die temperature exceeds 125°C, the FAN48623UC33X de-asserts PG to signal thermal warning but continues regulating. At 150°C, it shuts down completely and automatically restarts after cooling by ~20°C. This dual-threshold protection preserves system reliability without requiring external thermal sensors.
Can the FAN48623UC33X be used with input voltages above 4.5 V?
No-the recommended maximum input voltage is 4.5 V. While the absolute maximum rating is 6.5 V, operation above 4.5 V violates recommended conditions and risks reduced efficiency, premature wear, or instability. For 5 V input systems, consider the FAN48623UC50X variant instead.
What happens to the FAN48623UC33X output during forced bypass mode?
In forced bypass mode (BYP pin pulled LOW), the FAN48623UC33X fully enhances both internal MOSFETs to create a low-impedance path from VIN to VOUT. Output voltage equals VIN minus small RDS(on) drop (<100 mV at 2.5 A), and internal circuitry-including OCP, UVLO, and OTP-is disabled to achieve ≤12 µA quiescent current.
FAN48623UC33X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- TinyBoost®
- Package/Case:
- 16-UFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Last Time Buy
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- 3.5V
- Current - Output:
- 2.5A
- Frequency - Switching:
- 2.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-WLCSP (1.78x1.78)
FAN48623UC33X FAQ
1.How can I place an order for FAN48623UC33X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN48623UC33X 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 FAN48623UC33X reliable?
The price and inventory of FAN48623UC33X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN48623UC33X is usually 5 days.
3.What payment methods are accepted for FAN48623UC33X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN48623UC33X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN48623UC33X?
FAN48623UC33X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN48623UC33X 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 FAN48623UC33X?
For technical support, including FAN48623UC33X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN48623UC33X requirements.
6.How does Aetrix verify that FAN48623UC33X is sourced from the original manufacturer or authorized distributors?
All FAN48623UC33X 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 FAN48623UC33X meets industry standards.
7.What is the process for return or replacement of FAN48623UC33X?
All FAN48623UC33X units undergo pre-shipment inspection (PSI). If there is an issue with FAN48623UC33X, 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 FAN48623UC33X part is unused and in its original packaging.
Return procedure for FAN48623UC33X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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