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onsemi FAN48623UC50GX
- Part No.:
- FAN48623UC50GX
- Manufacturer:
- onsemi
- Package:
- 16-UFBGA, WLCSP
- Datasheet:
-
FAN48623UC50GX.pdf
- Description:
- IC REG BOOST PROG 2.5A 16WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,869
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Product details
Overview
FAN48623UC50GX from Fairchild Semiconductor is a 2500 mA synchronous TinyBoost® step-up regulator with true bypass mode, designed for Li-ion battery-powered portable systems requiring stable 5.0 V output from input voltages as low as 2.5 V. It delivers up to 97% efficiency at 3.6 VIN/5.0 VOUT, supports forced and automatic bypass operation, and integrates synchronous rectification and true load disconnect.
For engineers reviewing the FAN48623UC50GX datasheet, pinout, applications, or equivalent options, this device is selected for high-efficiency boost conversion in space-constrained mobile power rails where low quiescent current (6–12 µA in forced bypass), precise 5.190 V output accuracy (±4.0%), and seamless boost-to-bypass transition are critical.
Technical Context
The FAN48623UC50GX 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 governed by dual thresholds: automatic entry when VIN ≥ VOUT_TARGET + 30 mV and exit when VOUT ≤ VOUT_TARGET – 50 mV, with hysteresis preventing oscillation. Forced bypass is activated via the BYP pin, disabling internal circuitry except UVLO and OTP protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V nominal / 5.190 V typical; ±4.0% DC accuracy over full load and temperature ensures stable PMIC/LDO supply rail. |
| Max Continuous Output Current | 2500 mA at VIN = 2.5 V → 5.0 V; enables direct powering of 4G RF PAs and system logic without external current boosting. |
| Peak Pulse Current | 3.5 A for GSM PA slots; supports burst-mode transmission without voltage droop or regulation loss. |
| Efficiency | Up to 97% at 3.6 VIN/5.0 VOUT; minimizes thermal stress and extends battery runtime in compact handhelds. |
| Quiescent Current | 6–12 µA in forced bypass mode; reduces standby power loss during system sleep states. |
| Input Voltage Range | 2.5 V to 4.5 V (recommended); compatible with single-cell Li-ion batteries across full discharge curve (4.2 V → 2.5 V). |
| Switching Frequency | ~2.5 MHz in CCM; allows use of ultra-small 0.47 µH inductor and 0603 capacitors for minimal PCB footprint. |
Pinout & Package
Package: 16-bump, 1.81 mm × 1.81 mm, 0.4 mm pitch Wafer-Level Chip-Scale Package (WLCSP) with 250 µm solder balls; optimized for thermal dissipation and high-density mobile layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 EN | Enable control input | Active-high logic input (VIH ≥ 1.05 V); initiates startup sequence and disables all internal bias circuits when low. |
| A2 PG | Power Good open-drain output | Signals successful soft-start completion; de-asserted during fault, overload, or thermal shutdown (TJ > 125°C). |
| A3, A4 VIN | Main input power connection | Accepts 2.5–4.5 V battery input; connects directly to input capacitor (10 µF) with shortest possible trace. |
| B1 VSEL | Output voltage select | Configures target VOUT during boost operation; tied high/low or left floating per datasheet VOUT option table. |
| B3, B4 VOUT | Regulated output node | Delivers 5.0 V/5.190 V; requires 44 µF total ceramic capacitance (2×22 µF) placed adjacent to PGND pins for stability. |
| C1 BYP | Forced bypass control | Active-low input (VIL ≤ 0.4 V); activates ultra-low-IQ bypass path and disables switching regulators. |
| C3, C4 SW | Switching node | Connects to 0.47 µH inductor; carries high di/dt pulses; must be routed short and wide with ground shielding. |
| D1 AGND | Analog ground reference | Signal ground for internal error amplifier and reference; tied to PGND at single point to avoid noise coupling. |
| D2–D4 PGND | Power ground return | Low-impedance return path for inductor current and output capacitor; requires thermal vias to inner ground planes. |
| B2, C2 NC | No internal connection | Bumps present but unconnected; must be tied to PGND for mechanical stability and thermal conduction. |
Key Features
| Feature | Design Value |
|---|---|
| True bypass operation | VIN-to-VOUT path with <100 mΩ RDS(on) equivalent impedance when VIN > VOUT_TARGET, eliminating switching losses and reducing IQ to 6 µA. |
| Synchronous rectification | Integrated high-side and low-side MOSFETs eliminate external Schottky diode, improving efficiency by 3–5% vs. asynchronous designs. |
| Integrated soft-start | 300 µs ramp time (90% of VOUT_TARGET) prevents inrush current damage to input caps and downstream circuitry. |
| Short-circuit protection | Valley-current limiting triggers at 4.7–5.3 A; fault recovery after 20 ms auto-restart avoids latch-up during transient overloads. |
| Load disconnect | Internal NMOS switch isolates VOUT from VIN during shutdown or fault, blocking reverse leakage (<1 µA) and enabling safe hot-swap. |
Applications
| Smartphone Main PMIC Supply | 4G LTE Power Amplifier Bias Rail |
|---|---|
Use Scenario: Supplies 5.0 V to baseband processor PMIC from declining single-cell Li-ion battery (3.6 V → 2.5 V). IC Role / Device Role / Timing Role: Primary boost regulator with automatic bypass transition at VIN > 5.0 V to minimize quiescent loss during full-charge state. Use Value: Maintains regulated 5.0 V rail across full battery discharge while achieving >95% efficiency at 1.5 A load, extending talk time by 12% vs. legacy solutions. |
Use Scenario: Powers 4G LTE RF power amplifier requiring pulsed 5.0 V/3.5 A bursts with <50 mV ripple. IC Role / Device Role / Timing Role: High-pulse-current boost converter with valley-current limiting and 2.5 MHz switching for minimal output filter size. Use Value: Delivers 3.5 A peak pulses without regulation collapse or thermal throttling, enabling full 26 dBm LTE transmit power in 5 mm² WLCSP footprint. |
| Tablet System Brownout Prevention | Portable Medical Sensor Hub |
Use Scenario: Prevents brownout during CPU/GPU load surges by maintaining 5.0 V rail when battery sags below 3.3 V. IC Role / Device Role / Timing Role: Fast-transient-response boost regulator with DCM/CCM modulation and 500 ns load-step recovery. Use Value: Limits VOUT dip to <120 mV under 150–2000 mA 10 µs load steps, ensuring uninterrupted SoC operation during video decode bursts. |
Use Scenario: Powers analog front-end and BLE radio in battery-operated ECG sensor with strict 15 µA sleep budget. IC Role / Device Role / Timing Role: Ultra-low-IQ boost regulator with forced bypass mode enabled during MCU deep-sleep cycles. Use Value: Reduces system standby current to 18 µA (including IC and LDO), enabling 6-month battery life on CR2032 cell. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61236PDSGR | 5.0 V fixed output, 3.5 A peak, 2.5 MHz, 12-bump 1.6 mm × 1.6 mm WLCSP; no forced bypass pin, relies on automatic bypass only. | Lacks dedicated BYP pin for deterministic low-IQ control; unsuitable where software-gated bypass is required for system-level power sequencing. | Select if board space is tighter (1.6 mm vs. 1.81 mm) and forced bypass is not needed; verify PG timing compatibility with host PMIC. |
| MAX8642EWE+T | 5.0 V fixed output, 2.5 A continuous, 2.2 MHz, 16-pin 3 mm × 3 mm TQFN; includes I2C programmability and thermal foldback. | Requires external MOSFETs and larger passive components; offers configurability but doubles solution area and increases BOM count. | Choose when design requires dynamic VOUT adjustment or thermal derating control; avoid if minimizing component count and footprint is primary goal. |
Compared with TPS61236PDSGR and MAX8642EWE+T, the FAN48623UC50GX uniquely combines 5.0 V precision output, forced bypass control, and 1.81 mm WLCSP in a 4-component solution-enabling smaller, lower-power, and more deterministic power management than either alternative.
Availability
FAN48623UC50GX is available at Aetrix Electronics and suitable for smartphone main PMIC supplies, 4G LTE power amplifier bias rails, tablet brownout prevention, and portable medical sensor hubs requiring stable component supply with guaranteed long-term availability.
Supply support for FAN48623UC50GX 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 consumer and portable electronics.
The FAN48623 product line was engineered specifically for advanced Li-ion battery systems in smartphones and tablets, delivering high-current boost conversion with ultra-low quiescent power and seamless bypass functionality in wafer-level packaging.
FAQ
What is the exact output voltage tolerance of the FAN48623UC50GX?
The FAN48623UC50GX has a fixed nominal output voltage of 5.0 V with a typical value of 5.190 V. Its DC output voltage accuracy is specified as ±4.0% over temperature (–40°C to +85°C) and load (0–2500 mA), verified per the datasheet's VREG parameter. This tolerance ensures reliable operation of downstream 5 V-tolerant PMICs and LDOs without additional regulation stages. The FAN48623UC50GX maintains this accuracy even under pulse-load conditions up to 3.5 A.
How does the forced bypass mode function in the FAN48623UC50GX?
Forced bypass mode in the FAN48623UC50GX is activated by pulling the BYP pin low (≤0.4 V). This disables the boost switching circuitry and fully enhances internal MOSFETs Q1 and Q3 to create a low-impedance VIN-to-VOUT path. Quiescent current drops to 6–12 µA, and protections like OCP and UVLO are disabled-though OTP remains active. The FAN48623UC50GX exits forced bypass only when BYP is pulled high, initiating a controlled soft-start sequence before resuming boost operation.
Can the FAN48623UC50GX operate with input voltages above 4.5 V?
No-the FAN48623UC50GX has a recommended operating input voltage range of 2.5 V to 4.5 V. While its absolute maximum VIN rating is 6.5 V, operation above 4.5 V violates the Recommended Operating Conditions and risks degraded efficiency, increased thermal stress, and potential instability. The FAN48623UC50GX is designed for single-cell Li-ion batteries (max 4.2 V), and its automatic bypass threshold is calibrated for VOUT_TARGET = 5.0 V; exceeding 4.5 V may cause premature or unstable bypass transitions.
What is the minimum output capacitance required for stable operation of the FAN48623UC50GX at 5.0 V?
For stable operation at 5.0 V output, the FAN48623UC50GX requires a minimum effective output capacitance (CEFF) of 6 µF, as specified in Table 4 of the datasheet. This accounts for DC bias derating of ceramic capacitors; using two 22 µF, 0603, X5R, 10 V-rated capacitors (e.g., TDK C1608X5R1A226M080AC) yields sufficient CEFF across the operating voltage range. Placing these capacitors adjacent to the VOUT and PGND pins is mandatory to suppress ripple and prevent oscillation.
Does the FAN48623UC50GX support dynamic output voltage adjustment via the VSEL pin?
No-the VSEL pin on the FAN48623UC50GX is used only during initial boost startup to select among factory-programmed output voltage options (e.g., 3.15 V, 3.2 V, 3.3 V, 3.5 V, or 5.0 V). For the FAN48623UC50GX variant, VSEL is internally configured to fix VOUT at 5.0 V/5.190 V; it does not support real-time reconfiguration. Unlike programmable regulators, the FAN48623UC50GX's VSEL pin has no active control function during steady-state operation and should be left unconnected or tied per the specific ordering option's marking code (JM).
FAN48623UC50GX 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):
- 5.2V
- 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)
FAN48623UC50GX FAQ
1.How can I place an order for FAN48623UC50GX through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN48623UC50GX 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 FAN48623UC50GX reliable?
The price and inventory of FAN48623UC50GX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN48623UC50GX is usually 5 days.
3.What payment methods are accepted for FAN48623UC50GX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN48623UC50GX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN48623UC50GX?
FAN48623UC50GX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN48623UC50GX 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 FAN48623UC50GX?
For technical support, including FAN48623UC50GX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN48623UC50GX requirements.
6.How does Aetrix verify that FAN48623UC50GX is sourced from the original manufacturer or authorized distributors?
All FAN48623UC50GX 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 FAN48623UC50GX meets industry standards.
7.What is the process for return or replacement of FAN48623UC50GX?
All FAN48623UC50GX units undergo pre-shipment inspection (PSI). If there is an issue with FAN48623UC50GX, 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 FAN48623UC50GX part is unused and in its original packaging.
Return procedure for FAN48623UC50GX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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