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onsemi FAN49103AUC340X
- Part No.:
- FAN49103AUC340X
- Manufacturer:
- onsemi
- Package:
- 20-UFBGA, WLCSP
- Datasheet:
-
FAN49103AUC340X.pdf
- Description:
- IC REG BCK BST PROG/3.4V 20WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:10,653
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Product details
Overview
FAN49103AUC340X from onsemi is a synchronous buck-boost DC-DC regulator delivering up to 2.5 A at 3.4 V output, operating across 2.5 V–5.5 V input with seamless mode transition, I²C programmability, and 1.8 MHz PWM switching. It serves as the primary power rail for Li-ion–powered mobile RF subsystems requiring stable voltage under dynamic load and input conditions.
For engineers reviewing the FAN49103AUC340X datasheet, pinout, applications, or equivalent options, key selection criteria include its WLCSP-20 package footprint, I²C slave address 0x70, 3.4 V factory-default output, integrated safety protections (UVLO/OTP/SCP/OCP), and pass-through mode capability for ultra-low quiescent operation.
Technical Context
The FAN49103AUC340X implements a four-switch full-bridge topology enabling true buck, boost, and buck-boost operation-mode selection determined by real-time comparison of PVIN to target VOUT. Its current-mode modulator enables smooth PFM-to-PWM transitions at ~300 mA load threshold while maintaining <±45 mV load transient deviation.
Internal soft-start ramps the reference over 260 µs to limit inrush; output discharge activates via 230 Ω internal path when EN is low. Protection logic includes cycle-by-cycle peak current limiting (5.2 A typ), thermal shutdown at 150°C, and fault recovery after 30 ms cooldown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Factory-set 3.4 V (±1% DC accuracy); programmable from 2.5 V to 4.0 V in 25–50 mV steps via I²C register 0x01 |
| Max Output Current | 2.5 A continuous at 3.4 V output with 3.0 V input; derates to 2.0 A at 2.5 V input due to conduction loss |
| Input Voltage Range | 2.5 V to 5.5 V-supports single-cell Li-ion (2.8–4.2 V) and USB-powered systems without external LDO pre-regulation |
| Switching Frequency | 1.8 MHz nominal in PWM mode; enables use of compact 1 µH inductor and 47 µF ceramic output capacitors |
| Quiescent Current | 24 µA typical in PFM mode-enables >100-hour standby in always-on NFC or sensor nodes |
| Efficiency | >96% at 500 mA load (3.0 V→3.4 V), >90% at 50 mA (3.0 V→3.4 V PFM)-minimizes thermal rise in sealed portable enclosures |
| I²C Interface | Standard/Fast/HS-mode compatible; slave address 0x70 (7-bit); supports dynamic VOUT reconfiguration during system operation |
Pinout & Package
Package: 20-ball WLCSP (1.615 mm × 2.015 mm, 0.4 mm pitch, 0.586 mm height), case 567QK. Thermal pad connected to PGND via bottom-side solder balls.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A3, A4 | PVIN | Main power input-connects directly to input capacitor; handles full 2.5 A load current path |
| A1 | AVIN | Analog supply-bypassed to CIN; powers control circuitry and references; must be shorted to PVIN |
| A2 | EN | Active-high enable-logic-compatible with 1.1 V VIH; asserts soft-start and disables output discharge when pulled low |
| B3, B4 | SW1 | High-side switch node-connects to one end of inductor; carries high di/dt buck-boost switching current |
| E1 | AGND | Analog ground-reference for internal regulators and ADCs; must be shorted to PGND at COUT ground pad |
| B1, C1–C4, D1 | PGND | Power ground-return path for all MOSFET sources; requires low-inductance connection to CIN/COUT ground planes |
| D2 | SDA | I²C bidirectional data-open-drain; requires external pull-up to VOUT; supports hot-plug configuration updates |
| D3, D4 | SW2 | Second high-side switch node-completes full-bridge topology; tied to same inductor as SW1 |
| E2 | PG | Open-drain power-good-pulled low during fault (OCP/OTP/UVLO) or startup failure; requires external VOUT-referenced pull-up |
| B2 | SCL | I²C clock input-synchronizes register reads/writes; tolerant of 0.4 V VIL for noise immunity |
| E3, E4 | VOUT | Regulated output-connects to load and COUT; dual-bump design reduces IR drop under 2.5 A load |
Key Features
| Feature | Design Value |
|---|---|
| Seamless buck-boost transition | Eliminates output voltage glitch during PVIN crossing VOUT-critical for uninterrupted RF PA bias in 4G/LTE handovers |
| Programmable output voltage | Enables single-BOM support for multiple voltage rails (e.g., 3.3 V for baseband, 3.4 V for PA) via firmware update |
| Pass-through mode | Disables switching entirely-VOUT ≈ PVIN − IOUT×(RDS_ON_Q1+RDS_ON_Q3+DCR_L); cuts IQ to 27 µA for ultra-low-power wake-on-radio |
| Integrated safety protections | Hardware-enforced UVLO (2.0 V), OTP (150°C), SCP, and OCP-no external components required for robust field deployment |
| Low-ripple PWM operation | 4 mVpp ripple at 1 A load (4.2 V→3.4 V) meets stringent noise specs for analog sensor front-ends and audio codecs |
Applications
| Smartphone RF Power Amplifier | Portable NFC Reader |
|---|---|
Use Scenario: Supplies 3.4 V bias to 4G/LTE power amplifier during transmit bursts with rapid input voltage sag from battery discharge. IC Role / Device Role / Timing Role: Primary buck-boost regulator providing dynamically stable VOUT despite PVIN dropping from 4.2 V to 3.0 V mid-transmit. Use Value: Seamless mode transition prevents PA gain collapse; 96% efficiency at 500 mA minimizes thermal throttling in thin form factor. | Use Scenario: Powers NFC controller and antenna driver in battery-operated access card reader with intermittent 100 ms active periods. IC Role / Device Role / Timing Role: Regulator + intelligent power manager-enters PFM mode between reads, switches to PWM only during 13.56 MHz carrier generation. Use Value: 24 µA quiescent current extends battery life to >2 years; I²C allows firmware-adjusted VOUT to match varying antenna impedance. |
| Li-ion–Powered Wearable Sensor Hub | Multi-Mode Cellular IoT Module |
Use Scenario: Powers ultra-low-power MCU, IMU, and BLE radio in fitness tracker with single-cell Li-ion (2.8–4.2 V range). IC Role / Device Role / Timing Role: Single-rail regulator supporting both buck (high VIN) and boost (low VIN) phases; enables pass-through mode during deep-sleep MCU states. Use Value: 0.5 µA shutdown current preserves battery charge; internal soft-start prevents sensor reset during wake-up events. | Use Scenario: Provides configurable 3.3–3.4 V rail for LTE-M/NB-IoT modem ICs that require different voltages per network band and transmission power level. IC Role / Device Role / Timing Role: Programmable regulator allowing runtime VOUT adjustment via host processor I²C commands to optimize modem efficiency per link condition. Use Value: Eliminates need for discrete LDOs or multiple fixed regulators-reduces BOM count and PCB area by 32 mm² vs. discrete solution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS63802DLAR | Fixed 3.3 V output; no I²C interface; 2.0 A max output; 2.5 V–5.5 V input | Lacks programmability and higher current capability-suitable only for static-voltage designs without dynamic PA tuning | Select if cost sensitivity outweighs need for firmware-controlled VOUT and 2.5 A headroom |
| MAX20098ATCA/V+T | 3.4 V factory-set; I²C programmable; 2.0 A max; 2.5 V–5.5 V input; integrated spread-spectrum | Lower current rating and no pass-through mode-limits use in high-pulse-current PA applications | Choose when EMI reduction is prioritized over peak current delivery and ultra-low-IQ sleep modes |
Compared with TPS63802DLAR and MAX20098ATCA/V+T, the FAN49103AUC340X uniquely combines 2.5 A capability, I²C-based VOUT reconfiguration, pass-through mode, and seamless buck-boost transition-making it optimal for next-generation mobile RF power management where voltage agility and efficiency coexist.
Availability
FAN49103AUC340X is available at Aetrix Electronics and suitable for smartphone RF power amplifiers, portable NFC readers, wearable sensor hubs, and multi-mode cellular IoT modules requiring stable component supply across long production lifecycles.
Supply support for FAN49103AUC340X 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 (Nasdaq: ON) is a global semiconductor leader delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The FAN49103AUC340X belongs to onsemi's TinyPower™ family of ultra-compact, high-efficiency DC-DC converters designed specifically for space-constrained, battery-powered mobile and wearable electronics demanding minimal quiescent current and dynamic voltage control.
FAQ
What is the default output voltage of the FAN49103AUC340X?
The FAN49103AUC340X is factory-programmed to deliver 3.4 V at VOUT. This value is stored in the VOUT_REF register (address 0x01) and can be modified via I²C to any value between 2.5 V and 4.0 V in 25–50 mV increments. The 3.4 V setting matches common RF power amplifier requirements in 4G/LTE smartphones and ensures optimal efficiency across typical Li-ion battery discharge curves.
Does the FAN49103AUC340X support pass-through mode, and how is it enabled?
Yes, the FAN49103AUC340X supports pass-through mode, which disables switching and allows VOUT to track PVIN minus resistive losses. It is enabled by writing '1' to bit 3 (i2c_pt_in) of the CONTROL register (0x02) via I²C. In this mode, only UVLO and OTP protections remain active-OCP is disabled-and quiescent current drops to 27 µA, making it ideal for ultra-low-power wake-on-radio or sensor wake-up scenarios.
What is the I²C slave address for the FAN49103AUC340X?
The FAN49103AUC340X uses a fixed 7-bit I²C slave address of 0x70 (hex), corresponding to the 8-bit address 0xE0 when the R/W bit is included. This address is confirmed in the datasheet's Ordering Information table and I²C Slave Address section. No hardware address pins exist-address variation across variants (e.g., FAN49103AUC34AX uses 0x71) is handled solely through part number selection.
How does the FAN49103AUC340X handle load transients, and what is the typical response?
The FAN49103AUC340X delivers ±45 mV load transient deviation for 0.5 A ↔ 1 A steps (1 µs edge) and ±125 mV for 0.5 A ↔ 2.0 A steps at 3.4 V output. This performance stems from its current-mode control architecture and seamless PFM/PWM transition logic, which maintains regulation without mode-hunting artifacts. The 260 µs soft-start time also prevents overshoot during initial power-up into capacitive loads.
What package type and dimensions does the FAN49103AUC340X use?
The FAN49103AUC340X uses a 20-ball Wafer-Level Chip-Scale Package (WLCSP) measuring 1.615 mm × 2.015 mm with 0.4 mm ball pitch and 0.586 mm maximum height (case 567QK). Its footprint occupies just 3.26 mm², and total solution area-including recommended 1 µH inductor and dual 47 µF capacitors-is 11.61 mm², enabling integration into sub-10 mm² mobile PCB regions.
FAN49103AUC340X 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, 3.4V
- 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 (1.96x1.56)
FAN49103AUC340X FAQ
1.How can I place an order for FAN49103AUC340X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN49103AUC340X 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 FAN49103AUC340X reliable?
The price and inventory of FAN49103AUC340X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN49103AUC340X is usually 5 days.
3.What payment methods are accepted for FAN49103AUC340X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN49103AUC340X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN49103AUC340X?
FAN49103AUC340X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN49103AUC340X 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 FAN49103AUC340X?
For technical support, including FAN49103AUC340X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN49103AUC340X requirements.
6.How does Aetrix verify that FAN49103AUC340X is sourced from the original manufacturer or authorized distributors?
All FAN49103AUC340X 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 FAN49103AUC340X meets industry standards.
7.What is the process for return or replacement of FAN49103AUC340X?
All FAN49103AUC340X units undergo pre-shipment inspection (PSI). If there is an issue with FAN49103AUC340X, 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 FAN49103AUC340X part is unused and in its original packaging.
Return procedure for FAN49103AUC340X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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