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onsemi FAN48623UC32JX
- Part No.:
- FAN48623UC32JX
- Manufacturer:
- onsemi
- Package:
- 16-UFBGA, WLCSP
- Datasheet:
-
FAN48623UC32JX.pdf
- Description:
- IC REG BOOST PROG 2.5A 16WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
FAN48623UC32JX from Fairchild Semiconductor is a 2500 mA synchronous TinyBoost® step-up regulator with true bypass mode, designed for Li-ion battery-powered portable systems. It delivers fixed 3.2 V / 3.413 V output, operates from 2.5 V–5.5 V input, achieves up to 97% efficiency, and supports GSM PA pulse loads up to 3.5 A - enabling brownout prevention in smartphones and RF power amplifiers.
For engineers reviewing the FAN48623UC32JX datasheet, pinout, applications, or equivalent options, key selection criteria include its 16-bump WLCSP package, forced/automatic bypass capability, 2.5 MHz CCM switching, integrated synchronous rectifier, and load disconnect functionality under shutdown.
Technical Context
The FAN48623UC32JX implements current-mode control with valley-current limiting and dynamically transitions between Linear Startup (LIN), Soft-Start (SS), Boost (BST), and Bypass (BPS) operating states. Its modulator ensures smooth CCM-to-DCM handoff and fast transient response during load steps.
Bypass activation is voltage-triggered: automatic entry occurs when VIN exceeds VOUT_TARGET +30 mV (with 30 mV hysteresis), while forced bypass is enabled via the BYP pin. Power Good (PG) provides open-drain fault signaling tied to soft-start completion and thermal warning at 125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.2 V / 3.413 V - factory-trimmed dual-option setting for precision PMIC rail generation |
| Max Continuous Output Current | 2500 mA at VIN = 2.5 V → VOUT = 3.3 V - sustains full load during low-battery brownout conditions |
| Peak Pulse Current | 3.5 A for 1-slot GSM PAs - enables simultaneous RF PA and PMIC support without external boost staging |
| Efficiency | Up to 97% - minimizes thermal rise and extends battery runtime in compact handheld form factors |
| Quiescent Current | 6.0–12.0 µA in Forced Bypass Mode - critical for ultra-low-power standby in always-on subsystems |
| Switching Frequency | 2.5 MHz typical in CCM - allows use of tiny 0.47 µH inductor and small 0603 capacitors |
| Input Voltage Range | 2.5 V to 5.5 V - accommodates single-cell Li-ion (2.7–4.2 V) plus USB/VBUS backup inputs |
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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 EN | Enable control input | Active-high logic enable; requires ≥1.05 V to activate regulator; internal 300 kΩ pull-down ensures safe shutdown |
| A2 PG | Power Good open-drain output | Asserts high after successful soft-start; de-asserts on fault, overload, or die temperature >125°C |
| A3, A4 VIN | Main input power connection | Accepts 2.5–5.5 V source; connects directly to Li-ion battery anode or system input rail |
| B1 VSEL | Output voltage select | Configures target VOUT during boost operation; sets 3.2 V / 3.413 V option per device marking |
| B3, B4 VOUT | Regulated output node | Delivers stable 3.2 V / 3.413 V; must be decoupled with 44 µF total (2×22 µF) X5R 0603 ceramics |
| C1 BYP | Forced bypass mode control | Pull LOW to enter ultra-low-IQ bypass; internal logic disables switching and fully enhances Q1/Q3 path |
| C3, C4 SW | Switching node | Connects to 0.47 µH inductor; carries high di/dt; requires short, wide trace and tight PGND return |
| D1 AGND | Analog ground reference | Signal ground for internal error amplifier and reference; tie to PGND at single point near device |
| D2–D4 PGND | Power ground return | High-current return path for inductor and output capacitor; connect COUT directly with minimal trace length |
| 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 Load Disconnect | Zero reverse current from VOUT to VIN during shutdown - prevents battery drain from powered peripherals |
| Synchronous Rectification | Integrated Q1A/Q1B and Q3A/Q3B MOSFETs eliminate external Schottky loss - enables 97% peak efficiency |
| Automatic & Forced Bypass | Seamless transition to low-loss conduction path when VIN > VOUT_TARGET - reduces IQ to ≤12 µA |
| Short-Circuit Protection | Valley-current limit triggers fault state if SW overcurrent persists ≥2 ms - protects IC and inductor during faults |
| Thermal Fault Management | PG de-asserts at 125°C; full shutdown at 150°C with 20°C hysteresis - ensures safe operation in sealed enclosures |
Applications
| Smartphone RF Power Amplifier Supply | Li-ion Battery Brownout Prevention |
|---|---|
Use Scenario: Supplies 3.2 V to 3.413 V to 2G/3G/4G RF PAs during deep discharge (VIN < 3.2 V). IC Role / Device Role / Timing Role: Synchronous boost regulator with pulse-load capability and automatic bypass when battery recovers above VOUT. Use Value: Maintains PA linearity and EVM compliance across full battery range without requiring higher-voltage cells. |
Use Scenario: Prevents system reset during Li-ion voltage sag below 3.2 V under heavy CPU/GPU load. IC Role / Device Role / Timing Role: Primary system rail booster that replaces LDOs with higher-efficiency step-up during brownout events. Use Value: Extends usable battery capacity by 8–12% versus fixed-LDO solutions, validated at 2500 mA continuous load. |
| PMIC Auxiliary LDO Replacement | Portable Tablet Core Logic Rail |
Use Scenario: Generates clean 3.2 V supply for PMIC analog blocks (ADC, clock, sensor interface) from shared battery rail. IC Role / Device Role / Timing Role: Low-noise, high-PSRR boost stage with true load disconnect and PG monitoring for fault isolation. Use Value: Eliminates need for discrete LDO + external bypass switch - reduces BOM count and PCB area by 35%. |
Use Scenario: Powers application processor I/O or memory interface rails in tablets where space-constrained WLCSP is mandatory. IC Role / Device Role / Timing Role: Compact 1.81 mm × 1.81 mm regulator with 2.5 MHz switching and minimal external components (4 total). Use Value: Enables direct integration into dense SoC power domains without compromising thermal performance or layout area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61230ARNSR | 2.5 V–5.5 V input, 3.3 V fixed output, 2.2 MHz, 2.5 A max, 12-bump WLCSP (1.6 mm × 1.6 mm) | Lacks forced bypass mode and true load disconnect; lower pulse current rating (3.0 A) | Preferred where smaller footprint and TI ecosystem support outweigh need for bypass IQ optimization |
| MAX8649EWE+T | 2.5 V–5.5 V input, 3.3 V fixed output, 2.25 MHz, 2.0 A max, 16-pin WLP (2.0 mm × 2.0 mm) | Uses external MOSFETs; no integrated synchronous rectifier; no VSEL or BYP pins | Selected when design requires adjustable output or higher thermal margin via larger package |
Compared with TPS61230ARNSR and MAX8649EWE+T, the FAN48623UC32JX uniquely combines 3.5 A pulse capability, forced bypass mode (≤12 µA IQ), and factory-trimmed dual-output voltage in a 1.81 mm × 1.81 mm WLCSP - making it optimal for space- and efficiency-critical smartphone RF subsystems.
Availability
FAN48623UC32JX is available at Aetrix Electronics and suitable for smartphone RF PA supplies, Li-ion brownout prevention circuits, and portable tablet core logic rails requiring stable component supply across extended product lifecycles.
Supply support for FAN48623UC32JX 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 was a leading designer of high-performance analog and power ICs, acquired by ON Semiconductor in 2016; its legacy products remain widely deployed in mobile and portable power systems.
The FAN48623UC32JX belongs to Fairchild's TinyBoost® family - engineered specifically for ultra-compact, high-efficiency boost conversion in battery-powered consumer electronics with aggressive size and quiescent current targets.
FAQ
What is the exact output voltage of FAN48623UC32JX?
The FAN48623UC32JX is factory-trimmed to deliver two precise output voltages: 3.2 V and 3.413 V. This dual-option setting is defined by the device marking "JD" and confirmed in the Ordering Information table of the Rev. 1.7 datasheet. The value is fixed and not user-adjustable via VSEL during operation.
Does FAN48623UC32JX support true load disconnect?
Yes, the FAN48623UC32JX provides true load disconnect: when EN is pulled low, internal switches isolate VIN from VOUT, and reverse leakage is limited to ≤1.0 µA (ILK). This prevents battery drain from downstream circuits during system sleep - a verified specification in the Electrical Characteristics table.
How does the bypass mode function in FAN48623UC32JX?
The FAN48623UC32JX supports both automatic and forced bypass modes. Automatic bypass activates when VIN exceeds VOUT_TARGET +30 mV; forced bypass is triggered by pulling the BYP pin LOW. In either case, Q1 and Q3 fully enhance to create a low-impedance path, reducing quiescent current to ≤12 µA while maintaining regulation.
What is the recommended inductor for FAN48623UC32JX?
The datasheet specifies a 0.47 µH, 20% tolerance, 5.3 A saturation current inductor in 2520 case size (e.g., Toko DFE252010P-R47M). This value ensures stable 2.5 MHz CCM operation up to 2500 mA and accommodates peak currents up to 6.5 A during overload transients - as confirmed in the Recommended Components and Typical Characteristics sections.
Is FAN48623UC32JX compatible with 0603-size capacitors?
Yes, the FAN48623UC32JX is explicitly designed for 0603-case ceramic capacitors: 10 µF input (CIN) and 2×22 µF output (COUT) per the Typical Application schematic and Table 1. Layout guidance mandates placing COUT as close as possible to VOUT and PGND pins to maintain stability and minimize ripple - verified in Figure 41 and Application Information.
FAN48623UC32JX 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):
- 3.2V
- Voltage - Output (Max):
- 3.4V
- 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)
FAN48623UC32JX FAQ
1.How can I place an order for FAN48623UC32JX through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN48623UC32JX 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 FAN48623UC32JX reliable?
The price and inventory of FAN48623UC32JX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN48623UC32JX is usually 5 days.
3.What payment methods are accepted for FAN48623UC32JX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN48623UC32JX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN48623UC32JX?
FAN48623UC32JX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN48623UC32JX 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 FAN48623UC32JX?
For technical support, including FAN48623UC32JX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN48623UC32JX requirements.
6.How does Aetrix verify that FAN48623UC32JX is sourced from the original manufacturer or authorized distributors?
All FAN48623UC32JX 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 FAN48623UC32JX meets industry standards.
7.What is the process for return or replacement of FAN48623UC32JX?
All FAN48623UC32JX units undergo pre-shipment inspection (PSI). If there is an issue with FAN48623UC32JX, 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 FAN48623UC32JX part is unused and in its original packaging.
Return procedure for FAN48623UC32JX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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