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onsemi FAN48623UC36FX
- Part No.:
- FAN48623UC36FX
- Manufacturer:
- onsemi
- Package:
- 16-UFBGA, WLCSP
- Datasheet:
-
FAN48623UC36FX.pdf
- Description:
- IC REG BOOST PROG 2.5A 16WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,090
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Product details
Overview
FAN48623UC36FX from Fairchild Semiconductor is a 2500 mA synchronous TinyBoost® DC-DC boost regulator in WLCSP packaging, designed to generate fixed 3.6 V output from 2.5–5.5 V input. It integrates synchronous rectification, true load disconnect, and automatic/forced bypass mode for Li-ion battery-powered mobile systems requiring brownout prevention and RF PA supply stability.
For engineers reviewing the FAN48623UC36FX datasheet, pinout, applications, or equivalent options, key selection criteria include its 2.5 MHz CCM switching frequency, 97% peak efficiency at 3.3 V output, 140–190 µA quiescent current in auto-bypass mode, and validated 16-bump 1.81 mm × 1.81 mm WLCSP footprint with 0.4 mm pitch.
Technical Context
The FAN48623UC36FX employs current-mode modulation to ensure fast transient response and seamless transitions between Continuous Conduction Mode (CCM) at moderate-to-heavy loads and Discontinuous Conduction Mode (DCM) at light loads. Its valley-current limiting architecture supports up to 5.3 A peak inductor current during overload conditions.
Bypass operation is triggered when VIN exceeds the target VOUT (3.6 V), enabling ultra-low quiescent current (<12 µA in forced bypass). The device implements linear startup (LIN1/LIN2), soft-start (SS), and fault recovery with 20 ms restart timer - all coordinated via internal state machine without external control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.6 V ±4.0% over full load (0–2500 mA) and temperature (−40°C to +85°C) |
| Max Continuous Output Current | 2500 mA at VIN ≥ 2.5 V boosting to 3.6 V - enables direct powering of PMIC LDOs and 3G/4G RF PAs |
| Peak Pulse Current | 3.5 A for GSM PA slots - supports simultaneous PMIC and RF power delivery at VIN = 3.1 V, VOUT = 3.4 V |
| Efficiency | Up to 97% at 3.3 V output - reduces thermal load and extends battery runtime in portable devices |
| Quiescent Current | 140–190 µA in auto-bypass mode (VIN = 3.6 V) - minimizes standby drain on single-cell Li-ion batteries |
| Switching Frequency | 2.5 MHz typical in CCM - allows use of compact 0.47 µH inductor and small 0603 capacitors |
| Input Voltage Range | 2.5 V to 5.5 V - compatible with discharged Li-ion (2.5 V) and USB-powered (5 V) operation |
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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | EN | Active-high enable input - must be driven ≥1.05 V to activate regulation; <0.4 V disables IC with <12 µA shutdown current |
| A2 | PG | Open-drain Power Good flag - pulled low during fault (overload, UVLO, OTP) or before soft-start completion |
| A3, A4 | VIN | Main input power pins - connect directly to Li-ion battery; require 10 µF X5R 0603 input capacitor |
| B1 | VSEL | Output voltage select - sets target VOUT; for FAN48623UC36FX, configured for 3.6 V nominal output |
| B3, B4 | VOUT | Regulated output - delivers up to 2500 mA; requires dual 22 µF X5R 0603 output capacitors placed adjacent to PGND |
| C1 | BYP | Forced bypass control - pulling LOW activates low-impedance VIN-to-VOUT path, disabling switching and reducing IQ to ≤12 µA |
| C3, C4 | SW | Switching node - connects to 0.47 µH inductor; high di/dt node requiring short, wide trace and ground shielding |
| D1 | AGND | Analog ground reference - must tie to PGND at single point near CIN/COUT to avoid noise coupling into feedback |
| D2–D4 | PGND | Power ground return - shortest possible path to COUT cathode; critical for thermal dissipation and EMI control |
| B2, C2 | NC | No internal connection - bumps present but unconnected; recommended to tie to PGND for mechanical stability and thermal relief |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated high-side and low-side MOSFETs eliminate external Schottky loss - enables >97% efficiency and eliminates heat sink need |
| True load disconnect | Internal isolation prevents reverse current flow from VOUT to VIN during shutdown - protects battery from backfeed in system-level fault conditions |
| Automatic bypass mode | Seamless transition to low-loss conduction when VIN > 3.6 V - reduces IQ to ~190 µA while maintaining regulated output without switching noise |
| Forced bypass control | BYP pin activation disables all bias circuits except bypass FETs - achieves ≤12 µA quiescent current ideal for deep-sleep states |
| Short-circuit protection | Valley-current limit triggers fault state if SW node current exceeds 4.7–5.3 A - prevents damage during output shorts or heavy transient loads |
Applications
| Smartphone RF Power Amplifier Supply | Li-ion Battery Brownout Prevention |
|---|---|
|
Use Scenario: Delivering stable 3.6 V to 3G/4G LTE power amplifiers during burst transmission when battery voltage sags below 3.6 V. IC Role / Device Role / Timing Role: Synchronous boost regulator providing pulsed 3.5 A peak current with <300 µs soft-start to meet GSM slot timing requirements. Use Value: Prevents RF output collapse during battery discharge, ensuring consistent transmit power and regulatory compliance without adding discrete FETs or controllers. |
Use Scenario: Maintaining 3.6 V system rail as single-cell Li-ion discharges from 4.2 V to 2.5 V, avoiding processor brownout resets. IC Role / Device Role / Timing Role: Primary voltage booster with automatic bypass - operates in boost mode below 3.6 V VIN, then transitions to low-loss conduction above it. Use Value: Eliminates need for separate LDO or buck-boost IC, reducing BOM count and PCB area while sustaining >2500 mA continuous load across full battery range. |
| PMIC Auxiliary LDO Input Supply | Tablet Baseband Processor Core Rail |
|
Use Scenario: Feeding 3.6 V input to multi-rail PMICs (e.g., Qualcomm PM8941) that require stable ≥3.3 V input to generate core, I/O, and memory voltages. IC Role / Device Role / Timing Role: High-efficiency pre-regulator upstream of PMIC - handles dynamic load steps up to 2500 mA with <200 mV output droop. Use Value: Enables use of smaller input capacitors and improves overall power tree efficiency by 8–12% versus legacy charge-pump solutions. |
Use Scenario: Supplying 3.6 V core voltage to application processors (e.g., MediaTek MT8173) during active video decode or gaming workloads. IC Role / Device Role / Timing Role: Primary core rail generator with 2.5 MHz switching - supports fast load transients (150–2000 mA in 10 µs) with <200 mV undershoot. Use Value: Meets tight voltage tolerance (±4%) and ripple (<40 mV) requirements without external compensation, simplifying layout and validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61236PDSGR | 2.5 A max output, 3.6 V fixed option; 2.1 MHz switching; no forced bypass pin; uses external compensation | Lacks BYP-controlled ultra-low-IQ mode - quiescent current remains ~25 µA in pass-through, limiting battery life in deep sleep | Choose for designs prioritizing ease of loop compensation over lowest standby power; requires additional feedback resistors for non-standard outputs |
| RT9086AGJ5 | 2.3 A max output; 3.6 V fixed; 2.5 MHz; integrated soft-start; no VSEL or BYP pins - fully autonomous operation | Missing VSEL and BYP pins eliminates programmable output and forced bypass - limits flexibility in multi-voltage systems and low-power sequencing | Choose for cost-sensitive, space-constrained applications where fixed-function simplicity outweighs configurability needs |
Compared with TPS61236PDSGR and RT9086AGJ5, the FAN48623UC36FX uniquely combines 2500 mA capability, 3.6 V fixed output, forced bypass control (BYP), and VSEL-configurable variants in a 1.81 mm × 1.81 mm WLCSP - enabling both high-performance boost and sub-12 µA standby operation in minimal footprint.
Availability
FAN48623UC36FX is available at Aetrix Electronics and suitable for smartphone RF power supplies, Li-ion battery brownout prevention, and PMIC auxiliary rail generation requiring stable component supply, long-term lifecycle support, and qualified wafer-lot traceability.
Supply support for FAN48623UC36FX 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 FAN48623UC36FX belongs to Fairchild's TinyBoost® family - engineered specifically for space-constrained mobile devices needing high-current, low-noise, and ultra-low-quiescent boost conversion from single-cell Li-ion batteries.
FAQ
What is the fixed output voltage of the FAN48623UC36FX?
The FAN48623UC36FX is factory-configured for a fixed 3.6 V output voltage, with ±4.0% accuracy across 0–2500 mA load and −40°C to +85°C ambient temperature. This value is set by internal VSEL logic and cannot be adjusted externally - unlike other variants such as FAN48623UC33X (3.3 V) or FAN48623UC50X (5.0 V).
Does the FAN48623UC36FX support true load disconnect?
Yes, the FAN48623UC36FX provides true load disconnect: when EN is pulled low, internal switches isolate VIN from VOUT, preventing reverse current flow from output capacitors or system rails back into the battery. This feature is confirmed in the datasheet's "True Load Disconnect" bullet and functional block diagram under shutdown conditions.
How does the BYP pin function on the FAN48623UC36FX?
The BYP pin on the FAN48623UC36FX enables Forced Bypass Mode: pulling it LOW disables switching regulators and fully enhances internal FETs Q1 and Q3 to create a low-impedance VIN-to-VOUT path. This reduces quiescent current to ≤12 µA - ideal for system sleep states - and is distinct from automatic bypass, which activates only when VIN > 3.6 V.
What package type and dimensions does the FAN48623UC36FX use?
The FAN48623UC36FX uses a 16-bump Wafer-Level Chip-Scale Package (WLCSP) measuring 1.81 mm × 1.81 mm with 0.4 mm ball pitch and 250 µm solder balls. Its footprint matches other FAN48623 variants (e.g., UC33X, UC50X), enabling layout reuse across voltage options in space-critical mobile PCBs.
Can the FAN48623UC36FX operate with input voltage below 2.5 V?
No - the FAN48623UC36FX has a specified minimum input voltage of 2.5 V per Recommended Operating Conditions. Below this, UVLO (VUVLO = 2.35 V typ.) disables regulation, and absolute maximum ratings warn against sustained operation below −0.3 V. Operation at 2.4 V may result in unstable output or failure to start.
FAN48623UC36FX 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):
- 3.6V
- Voltage - Output (Max):
- 3.7V
- 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)
FAN48623UC36FX FAQ
1.How can I place an order for FAN48623UC36FX through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN48623UC36FX 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 FAN48623UC36FX reliable?
The price and inventory of FAN48623UC36FX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN48623UC36FX is usually 5 days.
3.What payment methods are accepted for FAN48623UC36FX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN48623UC36FX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN48623UC36FX?
FAN48623UC36FX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN48623UC36FX 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 FAN48623UC36FX?
For technical support, including FAN48623UC36FX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN48623UC36FX requirements.
6.How does Aetrix verify that FAN48623UC36FX is sourced from the original manufacturer or authorized distributors?
All FAN48623UC36FX 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 FAN48623UC36FX meets industry standards.
7.What is the process for return or replacement of FAN48623UC36FX?
All FAN48623UC36FX units undergo pre-shipment inspection (PSI). If there is an issue with FAN48623UC36FX, 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 FAN48623UC36FX part is unused and in its original packaging.
Return procedure for FAN48623UC36FX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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