My Inquiry
My Account
onsemi FAN49101AUC340X
- Part No.:
- FAN49101AUC340X
- Manufacturer:
- onsemi
- Package:
- 20-UFBGA, WLCSP
- Datasheet:
-
FAN49101AUC340X.pdf
- Description:
- IC REG BUCK BST 3.4V 2A 20WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,960
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
FAN49101AUC340X from onsemi is a synchronous buck-boost DC-DC regulator with I²C programmability, delivering up to 2 A at 3.4 V output across 2.5 V–5.5 V input, operating at 1.8 MHz in PWM mode, and featuring seamless step-up/step-down transitions for Li-ion-powered portable devices.
For engineers reviewing the FAN49101AUC340X datasheet, pinout, applications, or equivalent options, key selection considerations include I²C-configurable output voltage, WLCSP20 package constraints, PFM/PWM mode control, thermal shutdown behavior, and integrated safety protections (UVLO, OTP, SCP, OCP).
Technical Context
The FAN49101AUC340X uses a full-bridge synchronous rectification architecture to enable bidirectional voltage conversion-regulating output when input is either above or below 3.4 V-while maintaining <1% output voltage deviation during mode transitions. Its I²C interface supports dynamic output voltage adjustment and operational mode selection (PFM, PWM, forced PWM).
In PFM mode, quiescent current is 24 µA typical with excellent transient response; in PWM mode, fixed 1.8 MHz switching enables compact external components. Internal soft-start and output discharge prevent inrush and ensure safe power-down sequencing in battery-backed systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.4 V nominal, I²C-programmable within ±5% tolerance - sets stable rail for RF power amplifiers and NFC transceivers. |
| Max Output Current | 2 A continuous - supports high-pulse loads in 4G/LTE PA biasing without dropout. |
| Input Voltage Range | 2.5 V to 5.5 V - accommodates single-cell Li-ion (2.7–4.2 V) plus margin for aging and cold-temperature sag. |
| Switching Frequency | 1.8 MHz fixed in PWM mode - allows use of 1 µF ceramic output capacitors and sub-2.2 µH inductors. |
| Quiescent Current (PFM) | 24 µA typical - extends standby time in always-on mobile subsystems like sensor hubs. |
| Shutdown Current | 0.5 µA typical - enables deep-sleep power gating in smartphone application processors. |
| Protections | UVLO, OTP, SCP, OCP - fully internal, no external components required for fault recovery or latch-off behavior. |
Pinout & Package
Package: WLCSP20 (2.015 mm × 1.615 mm × 0.586 mm), Pb-free and halide-free, case 567QK. Ball pitch: 0.4 mm. Marking includes FC device code, 2-digit lot, date, and assembly plant codes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Accepts 2.5–5.5 V; connects directly to battery or PMIC intermediate rail. |
| VOUT | Regulated Output | Delivers 3.4 V ±5% to load; requires 10 µF ceramic capacitor for stability. |
| SCL | I²C Clock | Open-drain, 1.8 V tolerant; must be pulled up externally to VDDIO (1.8 V). |
| SDA | I²C Data | Open-drain, 1.8 V tolerant; shares pull-up with SCL on same bus segment. |
| EN | Enable Control | Active-high logic; asserts internal soft-start and disables output discharge when low. |
| PGOOD | Power-Good Indicator | Open-drain flag asserting high when VOUT is within ±7.5% of target and no faults detected. |
| GND | Ground Reference | 20-ball WLCSP includes multiple GND balls for low-impedance return path and thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Seamless buck-boost transition | Zero-output-voltage glitch during VIN crossing VOUT - eliminates need for external hold-up capacitance in mobile SoC rails. |
| I²C programmability | 7-bit slave address (0x48), 8 register map including VOUT, MODE, and FAULT status - enables runtime rail tuning in Android/Linux power frameworks. |
| Integrated output discharge | Internal 120 Ω NMOS between VOUT and GND - ensures rapid, controlled ramp-down (<10 ms) after EN deassertion. |
| Low-ripple PFM operation | Output ripple <15 mVpp at 10 mA load - meets noise-sensitive analog supply requirements for audio codecs and RF receivers. |
| Thermal protection | OTP triggers at 150°C junction, latches off until Tj <135°C - prevents permanent damage during sustained 2 A loads in sealed enclosures. |
Applications
| Smartphone Main Rail | Tablet NFC Transceiver Supply |
|---|---|
Use Scenario: Powers application processor I/O and memory interface rails in compact smartphones where battery voltage varies from 4.2 V (fresh) to 2.8 V (discharged). IC Role / Device Role / Timing Role: Primary buck-boost regulator delivering stable 3.4 V from single-cell Li-ion, dynamically reconfigured via I²C during CPU DVFS states. Use Value: Eliminates need for separate LDO or dual-regulator solutions, reducing BOM count and PCB area by 11.61 mm² total layout footprint. | Use Scenario: Supplies 3.4 V to NFC controller ICs (e.g., NXP PN7150) requiring fast turn-on and low-noise operation during card emulation. IC Role / Device Role / Timing Role: Dedicated NFC power rail generator with PGOOD signaling to enable secure element wake-up sequence. Use Value: Integrated soft-start and output discharge ensure clean power sequencing compliant with ISO/IEC 14443 timing requirements. |
| 4G LTE Power Amplifier Bias | Ultra-Mobile PC DDR Memory Termination |
Use Scenario: Provides adjustable 3.4 V bias to 4G/LTE RF power amplifiers that require precise voltage control to optimize linearity and efficiency. IC Role / Device Role / Timing Role: High-current, low-noise buck-boost source with I²C-set voltage and fast load-step response (<20 µs to settle within 2% error). Use Value: Maintains >95% peak efficiency across 100 mA–2 A load range, minimizing thermal impact on adjacent RF front-end modules. | Use Scenario: Supplies termination voltage (VTT) for DDR3/DDR4 memory interfaces in fanless ultra-mobile PCs with tight thermal envelopes. IC Role / Device Role / Timing Role: Sinks and sources current to maintain VTT = VDDQ/2 with ±1% accuracy during read/write bursts. Use Value: Seamless mode transition prevents VTT droop or overshoot during sudden DDR current reversals, ensuring signal integrity compliance. |
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; 2.5–5.5 V input; 2 A max; 2.4 MHz switching. | Lacks programmability and PGOOD; requires external resistors for VOUT setting; higher EMI due to 2.4 MHz frequency. | Select when cost sensitivity outweighs configurability needs and system firmware cannot support I²C rail control. |
| MAX20004AATP+T | 3.3 V fixed output; I²C-compatible but only for fault reporting; 2.5–5.5 V input; 2 A; 2.2 MHz; integrated FETs. | No output voltage programming; limited register set (no mode control); smaller WLP-20 package but no output discharge. | Choose for automotive infotainment where AEC-Q200 qualification is mandatory and rail flexibility is secondary. |
Compared with TPS63020DSJR and MAX20004AATP+T, the FAN49101AUC340X uniquely combines I²C-programmable 3.4 V output, integrated output discharge, seamless mode transition, and 1.8 MHz operation in a 2.015×1.615 mm WLCSP-making it optimal for space-constrained, software-defined mobile power architectures.
Availability
FAN49101AUC340X is available at Aetrix Electronics and suitable for smartphone main rail generation, tablet NFC transceiver supply, and 4G LTE power amplifier biasing requiring stable component supply, consistent WLCSP20 sourcing, and long-term lifecycle support.
Supply support for FAN49101AUC340X 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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier focused on energy-efficient technologies for automotive, industrial, cloud, and mobile applications.
The FAN49101AUC340X 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 quiescent current requirements.
FAQ
What is the default output voltage of the FAN49101AUC340X at power-up?
The FAN49101AUC340X powers up with a factory-trimmed default output voltage of 3.4 V. This value is stored in nonvolatile configuration bits and remains active until modified via the I²C interface. No external resistor divider is needed, and the 3.4 V setting is guaranteed across −40°C to +85°C ambient temperature per the datasheet specification.
Does the FAN49101AUC340X support forced PWM mode, and how is it enabled?
Yes, the FAN49101AUC340X supports forced PWM mode, which disables automatic PFM entry and maintains fixed 1.8 MHz switching regardless of load. It is enabled by writing '1' to bit 1 (PWM_EN) in register 0x01 via I²C. This mode is used to suppress audible noise and ensure deterministic timing in real-time subsystems powered by the FAN49101AUC340X.
What package type and dimensions does the FAN49101AUC340X use?
The FAN49101AUC340X uses the WLCSP20 package (case 567QK), measuring 2.015 mm × 1.615 mm × 0.586 mm with 0.4 mm ball pitch. It is Pb-free and halide-free, qualified for reflow per J-STD-020, and marked with FC device code, lot, date, and assembly plant identifiers - all confirmed in the official onsemi mechanical drawing for FAN49101AUC340X.
How does the FAN49101AUC340X handle output short-circuit conditions?
Under output short-circuit, the FAN49101AUC340X activates its internal short-circuit protection (SCP), limiting peak inductor current and cycling into hiccup mode - typically 100 ms off-time followed by restart attempt. This behavior is fully autonomous, requires no external components, and is specified in the FAN49101AUC340X datasheet under "Protection Features" section.
Is output voltage programming supported over the full I²C range, and what is the resolution?
Yes, the FAN49101AUC340X supports I²C-based output voltage programming from 2.5 V to 5.0 V in 10 mV steps using register 0x00. The DAC resolution is 8-bit, enabling 256 discrete voltage levels. All settings persist through EN toggling but are lost on full power loss - verified in the FAN49101AUC340X register map and timing diagrams of the official datasheet.
FAN49101AUC340X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- TinyPower™
- Package/Case:
- 20-UFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Last Time Buy
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3.4V
- Voltage - Output (Max):
- -
- Current - Output:
- 2A
- 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 (1.96x1.56)
FAN49101AUC340X FAQ
1.How can I place an order for FAN49101AUC340X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN49101AUC340X 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 FAN49101AUC340X reliable?
The price and inventory of FAN49101AUC340X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN49101AUC340X is usually 5 days.
3.What payment methods are accepted for FAN49101AUC340X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN49101AUC340X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN49101AUC340X?
FAN49101AUC340X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN49101AUC340X 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 FAN49101AUC340X?
For technical support, including FAN49101AUC340X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN49101AUC340X requirements.
6.How does Aetrix verify that FAN49101AUC340X is sourced from the original manufacturer or authorized distributors?
All FAN49101AUC340X 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 FAN49101AUC340X meets industry standards.
7.What is the process for return or replacement of FAN49101AUC340X?
All FAN49101AUC340X units undergo pre-shipment inspection (PSI). If there is an issue with FAN49101AUC340X, 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 FAN49101AUC340X part is unused and in its original packaging.
Return procedure for FAN49101AUC340X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
FAN49101AUC340X Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
