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onsemi FAN49103AUC330X
- Part No.:
- FAN49103AUC330X
- Manufacturer:
- onsemi
- Package:
- 20-UFBGA, WLCSP
- Datasheet:
-
FAN49103AUC330X.pdf
- Description:
- IC REG BCK BST PROG/3.3V 20WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,782
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Product details
Overview
FAN49103AUC330X from onsemi is a synchronous buck-boost DC-DC regulator delivering up to 2.5 A at 3.3 V output, operating across 2.5 V–5.5 V input, with I²C programmability and seamless mode transition. It uses full-bridge architecture with synchronous rectification and supports forced PWM (1.8 MHz) or auto PFM/PWM mode selection for high efficiency in portable Li-ion battery-powered systems.
For engineers reviewing the FAN49103AUC330X datasheet, pinout, applications, or equivalent options, key selection criteria include its 3.3 V factory-default output, 20-ball WLCSP package (1.615 mm × 2.015 mm), I²C slave address 0x70, ±5% total output accuracy under load transients, and integrated protections (UVLO, OTP, SCP, OCP).
Technical Context
The FAN49103AUC330X implements a four-switch full-bridge topology enabling true buck, boost, and buck-boost operation based on real-time PVIN-to-VOUT comparison. Its current-mode modulator ensures smooth transitions between PFM (24 µA quiescent current) and PWM (1.8 MHz fixed frequency) modes without output disturbance.
It features internal soft-start, output discharge (230 Ω), pass-through mode (VOUT ≈ PVIN − IOUT × RDS(ON)), and open-drain power-good (PG) signaling. Protection includes under-voltage lockout (2.00 V threshold), over-temperature shutdown (150 °C), and peak-current limiting (5.2 A typical).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Factory-set 3.3 V; programmable from 2.5 V to 4.0 V via I²C register 0x01 |
| Max Continuous Output Current | 2.5 A at VOUT = 3.3 V, VIN = 3.0 V; derates to 2.0 A at VIN = 2.5 V |
| Input Voltage Range | 2.5 V to 5.5 V - supports single-cell Li-ion (2.7–4.2 V) and USB-powered operation |
| Switching Frequency | 1.8 MHz nominal in PWM mode - enables compact 1 µH inductor and low-profile 47 µF ceramic output caps |
| Quiescent Current | 24 µA in PFM mode - extends battery life in always-on subsystems |
| Efficiency | 96% at 3.0 V IN / 3.3 V OUT / 500 mA; ≥90% across light-to-moderate loads in PFM |
| Output Accuracy | ±5% total (DC + load transient) - ensures stable rail for RF PA and NFC circuitry |
Pinout & Package
Package: 20-ball WLCSP (1.615 mm × 2.015 mm, 0.4 mm pitch, 0.586 mm height), case 567QK. Bump-down layout with AGND/PGND separation for noise-sensitive analog control and high-current power return paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A3, A4 | PVIN | Main power input (2.5–5.5 V); connects directly to CIN with minimal loop area |
| A1 | AVIN | Analog supply for control circuitry; tied to CIN and PVIN for noise isolation |
| A2 | EN | Active-high enable; supports GPIO control or direct tie to VIN for always-on operation |
| B3, B4 | SW1 | High-side switching node for buck path; connects to one end of power inductor L1 |
| E1 | AGND | Analog ground reference for control logic; shorted to PGND only at COUT ground pad |
| B1, C1–C4, D1 | PGND | Power ground for low-side MOSFETs; primary return path for CIN, COUT, and inductor |
| D2 | SDA | I²C bidirectional data line; requires external pull-up to VOUT for open-drain operation |
| D3, D4 | SW2 | High-side switching node for boost path; connects to opposite end of L1 from SW1 |
| E2 | PG | Open-drain power-good flag; pulled low during fault (OCP, OTP, UVLO) or startup failure |
| B2 | SCL | I²C clock input; compatible with Standard, Fast, Fast Plus, and HS (3.4 MHz) modes |
| E3, E4 | VOUT | Regulated output (3.3 V default); connects to load and COUT with shortest possible trace |
Key Features
| Feature | Design Value |
|---|---|
| Seamless buck/boost/buck-boost transition | Eliminates output voltage glitch during VIN crossing VOUT - critical for uninterrupted RF PA bias |
| I²C programmability (0x70 address) | Enables dynamic VOUT adjustment and mode control (PT/FPWM) without hardware change |
| Integrated safety protections | UVLO (2.00 V), OTP (150 °C), SCP/OCP (5.2 A peak limit) - reduces need for external supervision ICs |
| Low-ripple PFM/PWM hybrid operation | Maintains <22 mV ripple at 100 mA (PFM) and <4 mV at 1 A (PWM) - meets noise-sensitive NFC timing specs |
| Pass-through mode (I²C-enabled) | Disables switching when VIN ≈ VOUT; reduces losses and EMI while retaining OTP/UVLO protection |
Applications
| Smartphone Power Management | NFC Transceiver Bias Supply |
|---|---|
Use Scenario: Regulating power for baseband processor, display backlight, and camera modules in space-constrained smartphone PCBs. IC Role / Device Role / Timing Role: Primary buck-boost regulator supplying stable 3.3 V rail from varying Li-ion battery voltage (2.8–4.2 V). Use Value: Seamless mode transition prevents system reset or display flicker during battery discharge; 24 µA PFM IQ extends standby time. | Use Scenario: Providing clean, low-noise 3.3 V bias to near-field communication (NFC) controller and antenna driver ICs. IC Role / Device Role / Timing Role: Low-ripple, fast-transient regulator ensuring NFC carrier stability and modulation integrity during active communication. Use Value: <4 mV PWM ripple and ±45 mV load transient response meet NFC Forum RF interface requirements; I²C allows runtime VOUT tuning for different card types. |
| 2G/3G/4G Power Amplifier Supply | Portable Medical Sensor Hub |
Use Scenario: Delivering dynamically adjustable voltage to cellular RF power amplifiers requiring precise envelope tracking. IC Role / Device Role / Timing Role: Programmable buck-boost regulator supporting VOUT reconfiguration (e.g., 3.0 V → 3.6 V) via I²C during PA mode switching. Use Value: Factory-default 3.3 V output aligns with common PA bias points; 1.8 MHz switching enables small LC filter footprint adjacent to RF section. | Use Scenario: Powering ultra-low-power microcontroller, biosensor analog front-end, and BLE radio in wearable health monitors. IC Role / Device Role / Timing Role: High-efficiency, low-IQ regulator extending battery life while maintaining tight regulation during sensor burst sampling. Use Value: 96% efficiency at 500 mA and 24 µA PFM IQ maximize runtime; integrated soft-start prevents MCU brown-out during wake-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS63020DSJR | Fixed 3.3 V output; no I²C interface; 2.5 A max at 3.3 V; 2.5–5.5 V input; 2.4 MHz switching | Lacks programmability and PFM/PWM auto-selection; higher quiescent current (30 µA) | Choose for cost-sensitive designs where VOUT is static and I²C control is unnecessary |
| MAX20004AATP+T | 3.3 V fixed output; I²C-compatible but with different register map; 2.7 A max; 2.5–5.5 V input; 2.2 MHz | Includes spread-spectrum clocking; higher thermal resistance (θJA = 72 °C/W vs. 66 °C/W) | Prefer when EMI reduction is critical and board layout allows larger thermal pad area |
Compared with TPS63020DSJR and MAX20004AATP+T, the FAN49103AUC330X uniquely combines factory-programmed 3.3 V output with full I²C configurability, lowest PFM quiescent current (24 µA), and seamless mode transition - making it optimal for dynamically managed, space-constrained mobile power rails.
Availability
FAN49103AUC330X is available at Aetrix Electronics and suitable for smartphone power management, NFC transceiver bias, and 2G/3G/4G RF power amplifier applications requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for FAN49103AUC330X 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient technologies for automotive, industrial, cloud, and IoT applications.
The FAN49103AUC330X belongs to onsemi's TinyPower™ family of ultra-compact, high-efficiency DC-DC regulators designed specifically for battery-powered portable electronics with stringent size and efficiency requirements.
FAQ
What is the default output voltage of the FAN49103AUC330X?
The FAN49103AUC330X is factory-configured for 3.3 V output, as indicated by the "330" suffix in the part number. This value is stored in the VOUT_REF register (address 0x01) and can be reprogrammed via I²C to any value from 2.5 V to 4.0 V in 25 mV or 50 mV steps. The device retains this setting across power cycles when using standard I²C write commands.
Does the FAN49103AUC330X support I²C communication in high-speed mode?
Yes, the FAN49103AUC330X supports I²C High-Speed (HS) mode up to 3.4 MHz, in addition to Standard, Fast, and Fast Plus modes. Its SDA and SCL pins comply with I²C bus specifications, and the default slave address is 0x70 (7-bit address 0x70, R/W bit appended). HS mode is entered after the master sends the HS master code 00001XXX followed by a repeated START condition.
How does the FAN49103AUC330X handle transitions between buck and boost operation?
The FAN49103AUC330X uses a full-bridge four-switch architecture to achieve automatic, seamless transitions between buck, boost, and buck-boost modes based on real-time comparison of PVIN and target VOUT. During transition, all four MOSFETs switch in coordinated phases to maintain inductor volt-second balance - eliminating output voltage glitches or discontinuities that could disrupt sensitive loads like RF power amplifiers or NFC transceivers.
What protection features are integrated into the FAN49103AUC330X?
The FAN49103AUC330X integrates under-voltage lockout (UVLO, 2.00 V threshold), over-temperature protection (OTP, 150 °C shutdown), over-current protection (OCP, 5.2 A peak limit), and short-circuit protection (SCP). All protections trigger a FAULT state that disables switching and pulls the PG pin low. Recovery occurs automatically after a 30 ms cooldown period, provided conditions return to safe limits.
Can the FAN49103AUC330X operate in pass-through mode, and how is it enabled?
Yes, the FAN49103AUC330X supports pass-through (PT) mode where VOUT tracks PVIN minus conduction losses (VOUT ≈ PVIN − IOUT × RDS(ON)). PT mode is enabled by writing '1' to bit 3 (i2c_pt_in) of the CONTROL register (0x02) via I²C. In PT mode, switching halts, only UVLO and OTP remain active, and OCP is disabled - useful for minimizing losses when input voltage closely matches required output.
FAN49103AUC330X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- TinyPower™
- Package/Case:
- 20-UFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Programmable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.8V, 3.3V
- Voltage - Output (Max):
- 4V
- Current - Output:
- 2.5A
- Frequency - Switching:
- 1.8MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-WLCSP (1.62x2.02)
FAN49103AUC330X FAQ
1.How can I place an order for FAN49103AUC330X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN49103AUC330X 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 FAN49103AUC330X reliable?
The price and inventory of FAN49103AUC330X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN49103AUC330X is usually 5 days.
3.What payment methods are accepted for FAN49103AUC330X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN49103AUC330X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN49103AUC330X?
FAN49103AUC330X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN49103AUC330X 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 FAN49103AUC330X?
For technical support, including FAN49103AUC330X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN49103AUC330X requirements.
6.How does Aetrix verify that FAN49103AUC330X is sourced from the original manufacturer or authorized distributors?
All FAN49103AUC330X 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 FAN49103AUC330X meets industry standards.
7.What is the process for return or replacement of FAN49103AUC330X?
All FAN49103AUC330X units undergo pre-shipment inspection (PSI). If there is an issue with FAN49103AUC330X, 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 FAN49103AUC330X part is unused and in its original packaging.
Return procedure for FAN49103AUC330X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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