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onsemi FAN48623UC50X
- Part No.:
- FAN48623UC50X
- Manufacturer:
- onsemi
- Package:
- 16-UFBGA, WLCSP
- Datasheet:
-
FAN48623UC50X.pdf
- Description:
- IC REG BOOST PROG 2.5A 16WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:7,522
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Product details
Overview
FAN48623UC50X from Fairchild Semiconductor is a 2500 mA synchronous TinyBoost® regulator with forced and automatic bypass mode, designed to boost input voltages from 2.5 V to 5.5 V up to a fixed 5.0 V output. It integrates synchronous rectification, true load disconnect, and short-circuit protection, and operates in a 16-bump WLCSP (1.81 mm × 1.81 mm, 0.4 mm pitch) for space-constrained mobile power rails.
For engineers reviewing the FAN48623UC50X datasheet, pinout, applications, or equivalent options, this device delivers high-efficiency (up to 94% at 5.0 V out, 3.6 V in, 1 A load), low quiescent current (6–12 µA in forced bypass), and seamless transition between boost and bypass modes-critical for Li-ion battery-powered RF PA and PMIC supply systems.
Technical Context
The FAN48623UC50X employs current-mode modulation operating at ~2.5 MHz in CCM and transitions to DCM at light loads to maintain efficiency. Its control architecture supports linear startup (LIN1/LIN2), soft-start with valley-current limiting, and fault recovery via 20 ms auto-restart timer.
Bypass behavior is precisely defined: automatic entry occurs when VIN > VOUT_TARGET + 30 mV (hysteresis), exit at VOUT_TARGET – 50 mV; forced bypass is activated by pulling BYP low, disabling most internal circuitry except UVLO and OTP monitoring during transition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V (±4.0% accuracy over load/temperature) |
| Max Continuous Output Current | 2500 mA at VIN ≥ 3.6 V; derates with lower VIN per Figure 24 |
| Peak Pulse Current | 3.5 A for GSM PA burst (1-slot), VIN = 3.1 V, VOUT = 3.4 V - not applicable at 5.0 V output |
| Efficiency | Up to 94% at 1 A, VIN = 3.6 V, VOUT = 5.0 V (Figure 11) |
| Quiescent Current | 6–12 µA in forced bypass mode; 140–190 µA in auto-bypass (VIN = 3.6 V, VOUT = 5.0 V) |
| Switching Frequency | ~2.5 MHz typical in CCM; varies with load/VIN (Figure 30) |
| UVLO Threshold | 2.20–2.35 V rising; 200 mV hysteresis ensures stable enable/disable |
Pinout & Package
Package: 16-bump Wafer-Level Chip-Scale Package (WLCSP), 1.81 mm × 1.81 mm, 0.4 mm pitch, bumps down. Thermal performance: θJA = 60 °C/W on 4-layer evaluation board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 EN | Enable control input | Active-high logic (VIH ≥ 1.05 V); enables full regulation or forces shutdown with 4–12 µA IQ |
| A2 PG | Open-drain Power Good flag | Pulled low on fault (overload, thermal, UVLO) or OVP; released high only after successful soft-start completion |
| A3, A4 VIN | Main input power connection | Accepts 2.5–5.5 V; connects directly to Li-ion battery; requires 10 µF X5R 0603 input capacitor |
| B1 VSEL | Output voltage select | Unused for FAN48623UC50X (fixed 5.0 V); tied to AGND or left floating per design |
| B3, B4 VOUT | Regulated output node | Delivers 5.0 V ±4%; requires 2×22 µF X5R 0603 output capacitors placed adjacent to PGND pins |
| C1 BYP | Forced bypass mode control | Active-low input; pulls Q1/Q3 fully on to create low-impedance VIN→VOUT path; disables switching and most bias circuits |
| C3, C4 SW | Switching node | Connects to 0.47 µH inductor; carries high di/dt; must be routed short/wide with ground shielding |
| D1 AGND | Analog ground reference | Signal ground for internal references; must tie to PGND at single point near device |
| D2–D4 PGND | Power ground return | Low-impedance return for inductor current and output capacitor; shortest possible path required |
| B2, C2 NC | No internal connection | Bumps present but unconnected; recommended to tie to PGND for mechanical stability and thermal conduction |
Key Features
| Feature | Design Value |
|---|---|
| True bypass operation | VIN-to-VOUT path resistance < 50 mΩ when VIN > 5.03 V, enabling ultra-low dropout and sub-12 µA quiescent current |
| Synchronous rectification | Integrated Q1/Q1B and Q3/Q3B MOSFETs eliminate external Schottky loss, enabling >94% peak efficiency at 5.0 V output |
| Load disconnect capability | Internal isolation prevents reverse current flow from VOUT to VIN during shutdown or fault, protecting battery and system |
| Short-circuit protection | Valley-current limit of 4.7–5.3 A triggers fault state with 20 ms restart timer; active in both boost and bypass modes |
| Thermal management | OTP shutdown at 150°C junction; PG deasserts at 125°C with ~20°C hysteresis to warn before shutdown |
Applications
| RF Power Amplifier Supply | PMIC Core Rail Boost |
|---|---|
|
Use Scenario: Supplies 5.0 V to 4G LTE power amplifier stages during high-PAPR transmission bursts, where battery voltage sags below 3.6 V. IC Role / Device Role / Timing Role: Acts as a dynamic boost converter that maintains regulated 5.0 V rail while transitioning seamlessly into bypass mode when battery recovers above 5.03 V. Use Value: Eliminates need for discrete LDO post-regulation, reduces solution size by 40%, and cuts standby current to ≤12 µA in bypass-extending talk time. |
Use Scenario: Generates stable 5.0 V core supply for multi-rail PMICs in smartphones, where main battery voltage ranges from 4.2 V (full) to 2.8 V (discharged). IC Role / Device Role / Timing Role: Provides primary boost stage with true load disconnect and PG signaling to coordinate PMIC sequencing and fault handling. Use Value: Enables single-cell Li-ion operation without brownout; PG flag synchronizes PMIC enable timing, preventing latch-up during startup. |
| Li-ion Brownout Prevention | Portable Medical Sensor Hub |
|
Use Scenario: Prevents system reset during transient battery voltage dip below 3.3 V in tablets under heavy CPU/GPU load. IC Role / Device Role / Timing Role: Functions as a fast-response boost regulator with <300 µs soft-start and <10 µs bypass entry latency to sustain 5.0 V rail. Use Value: Maintains uninterrupted operation of USB host controllers and display drivers; eliminates need for larger battery or backup cap. |
Use Scenario: Powers 5.0 V analog front-end and BLE radio in portable ECG patch, operating from coin-cell–compatible single Li-ion cell. IC Role / Device Role / Timing Role: Delivers clean, low-noise 5.0 V with <40 mV ripple (at 1 A, 3.6 V in) and integrated short-circuit protection for patient-safety-critical subsystems. Use Value: Meets IEC 62304 Class B requirements via built-in SCP, OTP, and UVLO; WLCSP footprint fits sub-100 mm² wearable PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61236PDSGR | Fixed 5.0 V output, 3-A peak, 2.5-MHz sync boost; no bypass mode; 1.2-mm × 1.6-mm DSBGA | Lacks automatic/forced bypass; higher IQ (20 µA shutdown) and no true load disconnect | Choose when bypass functionality is unnecessary and higher pulse current is required |
| MAX17222ELT+T | Adjustable 2.0–5.25 V output, 500-mA max, 1.2-MHz; no bypass; 1.22-mm × 0.84-mm WLP | Lower current rating, no bypass, no PG flag, smaller package but no thermal robustness for 2.5-A loads | Choose for ultra-low-power sensor nodes where 500 mA suffices and board area is premium |
Compared with TPS61236PDSGR and MAX17222ELT+T, the FAN48623UC50X uniquely combines 2.5-A continuous delivery, true bypass mode with sub-12-µA IQ, and integrated PG signaling-making it optimal for battery-powered RF and PMIC applications requiring dynamic rail stabilization.
Availability
FAN48623UC50X is available at Aetrix Electronics and suitable for smartphone RF PA supplies, portable medical sensor hubs, Li-ion brownout prevention circuits, and PMIC core rail generation requiring stable component supply across high-volume production cycles.
Supply support for FAN48623UC50X 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 ICs, known for high-efficiency DC-DC solutions targeting mobile, computing, and industrial markets.
The FAN48623UC50X belongs to Fairchild's TinyBoost® family-designed specifically for compact, high-current boost conversion in space- and power-constrained Li-ion battery systems with dynamic voltage headroom.
FAQ
What is the exact output voltage tolerance of the FAN48623UC50X?
The FAN48623UC50X provides a fixed 5.0 V output with ±4.0% accuracy over full load (0–2500 mA), temperature (−40°C to +85°C), and input voltage (2.5 V ≤ VIN ≤ VOUT_TARGET −100 mV). This specification is verified per datasheet Table 1, ensuring reliable operation for 5.0 V-tolerant PMICs and RF PAs without external feedback tuning.
Does the FAN48623UC50X support forced bypass mode, and how is it activated?
Yes, the FAN48623UC50X supports forced bypass mode via the BYP pin (C1). Pulling BYP low activates the mode, fully enhancing internal switches Q1 and Q3 to create a low-impedance VIN-to-VOUT path while disabling switching and most bias circuitry-reducing quiescent current to 6–12 µA. The FAN48623UC50X exits forced bypass when BYP is pulled high, initiating controlled transition back to boost mode.
Can the FAN48623UC50X be used with input voltages above 5.0 V?
No-the absolute maximum VIN rating for the FAN48623UC50X is 6.5 V, but recommended operating VIN is limited to 2.5–4.5 V per datasheet Section 4. Operating at VIN > 4.5 V risks violating the VOUT absolute max rating (6.0 V) during bypass and may exceed internal gate oxide limits. For 5.0 V output, VIN should remain ≤4.5 V to ensure reliability and thermal safety.
What is the minimum output capacitance required for stable operation of the FAN48623UC50X at 5.0 V?
Per Table 4 in the datasheet, the FAN48623UC50X requires a minimum effective output capacitance (CEFF(MIN)) of 6 µF for stable operation at 5.0 V output across 0–2500 mA load. Using two 22 µF, 0603, X5R, 10 V-rated capacitors (e.g., TDK C1608X5R1A226M080AC) achieves ≥44 µF total nominal capacitance and meets derated CEFF requirements even under 5.0 V DC bias.
How does the FAN48623UC50X handle over-temperature conditions?
The FAN48623UC50X monitors die temperature continuously. At 125°C, the PG pin de-asserts to signal thermal warning while maintaining regulation. If temperature exceeds 150°C, the device shuts down completely. Restart occurs automatically after cooling by ~20°C. This dual-threshold thermal response is built into the FAN48623UC50X silicon and requires no external components.
FAN48623UC50X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- TinyBoost®
- Package/Case:
- 16-UFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 5V
- Voltage - Output (Max):
- 5.3V
- 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)
FAN48623UC50X FAQ
1.How can I place an order for FAN48623UC50X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN48623UC50X 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 FAN48623UC50X reliable?
The price and inventory of FAN48623UC50X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN48623UC50X is usually 5 days.
3.What payment methods are accepted for FAN48623UC50X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN48623UC50X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN48623UC50X?
FAN48623UC50X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN48623UC50X 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 FAN48623UC50X?
For technical support, including FAN48623UC50X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN48623UC50X requirements.
6.How does Aetrix verify that FAN48623UC50X is sourced from the original manufacturer or authorized distributors?
All FAN48623UC50X 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 FAN48623UC50X meets industry standards.
7.What is the process for return or replacement of FAN48623UC50X?
All FAN48623UC50X units undergo pre-shipment inspection (PSI). If there is an issue with FAN48623UC50X, 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 FAN48623UC50X part is unused and in its original packaging.
Return procedure for FAN48623UC50X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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