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onsemi FAN53611AUC12X
- Part No.:
- FAN53611AUC12X
- Manufacturer:
- onsemi
- Package:
- 6-UFBGA, WLCSP
- Datasheet:
-
FAN53611AUC12X.pdf
- Description:
- IC REG BUCK 1.2V 1A 6WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:5,895
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Product details
Overview
FAN53611AUC12X from onsemi is a 1 A, 1.200 V fixed-output synchronous buck regulator operating at 6 MHz with 24 µA quiescent current, 2.3–5.5 V input range, and integrated PMOS/NMOS power switches-designed for space-constrained mobile power rails in tablets and ultra-mobile PCs.
For engineers reviewing the FAN53611AUC12X datasheet, pinout, applications, or equivalent options, key selection criteria include its WLCSP-6 package footprint, PFM/PWM mode control via MODE pin, active output discharge capability, and compatibility with 470 nH inductors and 4.7 µF ceramic output capacitors.
Technical Context
The FAN53611AUC12X employs a proprietary non-linear fixed-frequency PWM modulator that maintains 6 MHz switching across wide VIN and load ranges while enabling seamless transition to PFM mode below ~300 mA. Its architecture eliminates ESR dependency, supporting low-ESR ceramic capacitors without loop compensation.
Control logic integrates internal soft-start (300 µs typical), UVLO (2.27 V threshold), thermal shutdown (150°C), and cycle-by-cycle current limiting (1750 mA typical peak). The MODE pin serves dual function: forcing PWM-only operation or enabling external clock synchronization at 1.3–1.7 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.200 V ±4% over 0–1 A load; enables direct powering of core logic rails without external feedback resistors. |
| Max Output Current | 1 A continuous; supports high-efficiency conversion for SoC I/O or GPU subsystems in portable devices. |
| Switching Frequency | 6 MHz nominal; allows use of ultra-small 470 nH inductors and reduces EMI fundamental frequency beyond typical RF bands. |
| Quiescent Current | 24 µA typical in PFM mode; sustains >80% efficiency down to 1 mA load for always-on system states. |
| Input Voltage Range | 2.3 V to 5.5 V; compatible with single-cell Li-ion (3.0–4.2 V), USB 5 V, and multi-rail battery systems. |
| Package | 6-bump WLCSP, 0.4 mm pitch, 1.16 × 0.86 mm footprint; optimized for minimal PCB area in thin-profile mobile designs. |
| Protection Features | Thermal shutdown (150°C), overcurrent hiccup mode (16-cycle fault detection), UVLO, and optional active output discharge (230 Ω path). |
Pinout & Package
Package: 6-bump Wafer-Level Chip-Scale Package (WLCSP), 0.4 mm pitch, 1.16 mm × 0.86 mm body, 586 µm typical height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | MODE | Multi-function control: logic HIGH forces PWM-only operation; logic LOW enables auto PFM/PWM transition; square wave input synchronizes switching to 4× frequency. |
| B1 | SW | Switch node connection to external inductor; carries high di/dt current and requires short, low-inductance routing. |
| C1 | FB | Feedback input tied directly to output; internal resistor divider sets 1.200 V reference-no external components required. |
| C2 | GND | Power and signal ground reference; must be connected to low-impedance PCB plane adjacent to CIN/COUT common point. |
| B2 | EN | Enable input: >1.2 V enables regulation; <0.4 V disables with <1 µA shutdown current and optional active FB discharge. |
| A2 | VIN | Main power input (2.3–5.5 V); requires local 2.2 µF ceramic capacitor placed within 2 mm of pin to minimize high-frequency ringing. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 24 µA in PFM mode preserves battery life in standby without sacrificing transient response. |
| 6 MHz fixed-frequency operation | Enables miniaturized passive components (470 nH/4.7 µF) and shifts EMI energy above sensitive 2.4 GHz ISM band. |
| Synchronous rectification | Integrated 175 mΩ PMOS / 165 mΩ NMOS switches eliminate external Schottky loss, achieving 92% peak efficiency. |
| Auto PFM/PWM mode transition | Seamless switching between high-efficiency light-load PFM and low-noise fixed-frequency PWM based on real-time load demand. |
| Internal soft-start | 300 µs controlled ramp prevents inrush current and output overshoot during power-up, even into large COUT (>15 µF). |
Applications
| Mobile Baseband Power | Tablet Application Processor Core Rail |
|---|---|
|
Use Scenario: Powering LTE/WiFi baseband ICs requiring stable 1.2 V at up to 1 A with rapid load transients during burst data transmission. IC Role / Device Role / Timing Role: Primary DC-DC converter delivering regulated core voltage with sub-100 ns transient recovery and <20 mV ripple. Use Value: Maintains 92% efficiency at full load and >85% at 10 mA, extending talk time while meeting strict EMI limits via 6 MHz switching. |
Use Scenario: Supplying ARM Cortex-A series CPU cores in tablets where board space is constrained and thermal dissipation must be minimized. IC Role / Device Role / Timing Role: High-density point-of-load regulator using WLCSP-6 package to fit beneath processor die, synchronized to system clock via MODE pin. Use Value: Reduces solution size by 40% vs. QFN alternatives; active discharge prevents floating voltage during sleep mode transitions. |
| Ultra-Mobile PC I/O Rail | Portable DSC/DVC Sensor Interface |
|
Use Scenario: Generating clean 1.2 V for PCIe Gen2 interface logic and memory controllers in fanless UMPCs with ambient temperatures up to +85°C. IC Role / Device Role / Timing Role: Thermally robust buck regulator with 125°C/W θJA and thermal shutdown hysteresis to sustain performance under sustained load. Use Value: Delivers full 1 A output continuously without derating; PFM mode maintains >80% efficiency during idle periods between data transfers. |
Use Scenario: Powering CMOS image sensor analog front-end and ADC in digital still/video cameras with strict low-noise requirements. IC Role / Device Role / Timing Role: Low-ripple voltage source using ceramic output capacitors and forced PWM mode to suppress switching noise near sensitive analog circuitry. Use Value: Achieves <15 mVpp ripple at 200 mA load; PSRR >60 dB at 100 kHz ensures minimal supply-induced image artifacts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62260DRVR | 600 mA max output, 1.2 V fixed, 2.05–6 V input, 2.25 MHz switching, 16-pin WSON package. | Limited to lower current; lacks MODE-synchronization and active discharge; higher minimum input voltage. | Select when 600 mA suffices and board layout accommodates larger WSON footprint. |
| RT7295BGJ6F | 1.5 A max output, adjustable VOUT (0.6–5.5 V), 2.5–5.5 V input, 1.5 MHz switching, 6-pin SOT-563 package. | Requires external feedback resistors; lower switching frequency increases inductor size; no PFM/PWM auto-transition. | Choose for adjustable output or higher current headroom where 1.5 MHz EMI profile is acceptable. |
Compared with TPS62260DRVR and RT7295BGJ6F, the FAN53611AUC12X offers superior current density in smallest footprint, integrated PFM/PWM intelligence, and unique MODE-pin synchronization-making it optimal for compact, high-efficiency 1.2 V mobile rails where timing control and thermal management are critical.
Availability
FAN53611AUC12X is available at Aetrix Electronics and suitable for mobile baseband power, tablet application processor core rails, and ultra-mobile PC I/O rail designs requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for FAN53611AUC12X 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 power management, analog, sensors, and connectivity solutions for automotive, industrial, cloud, and mobile applications.
The FAN53611AUC12X belongs to onsemi's high-frequency synchronous buck regulator product line, engineered specifically for space- and efficiency-critical power rails in portable consumer electronics with stringent EMI and thermal constraints.
FAQ
What is the guaranteed output voltage accuracy of the FAN53611AUC12X over temperature and load?
The FAN53611AUC12X delivers 1.200 V output with ±4% accuracy (1.152 V to 1.248 V) across 0–1 A load and –40°C to +85°C ambient temperature in PWM mode, and ±4.2% (1.152 V to 1.248 V) in auto PFM/PWM mode per onsemi datasheet Section 4 Electrical Characteristics. This specification ensures reliable core voltage compliance for modern low-voltage processors without external trimming.
Does the FAN53611AUC12X require external feedback resistors to set its output voltage?
No, the FAN53611AUC12X has an internally trimmed 1.200 V reference connected to the FB pin-no external resistors are needed. The FB pin is designed for direct connection to the output capacitor; adding external components will disrupt regulation and void specified accuracy. This simplifies layout and improves reliability in high-density mobile designs.
How does the MODE pin function in the FAN53611AUC12X, and what happens if left unconnected?
The MODE pin on the FAN53611AUC12X controls operating mode: logic HIGH forces fixed-frequency PWM, logic LOW enables automatic PFM/PWM transition, and AC input (1.3–1.7 MHz) synchronizes switching to 4× that frequency. It must not be left floating-unconnected MODE may cause erratic mode switching or failure to start due to internal Schmitt trigger uncertainty.
What is the maximum recommended output capacitance for stable startup of the FAN53611AUC12X?
Startup into large COUT is supported up to 15 µF with no additional circuitry; beyond that, multiple soft-start cycles occur due to displacement current exceeding current limit. For reliable single-cycle startup, onsemi recommends ≤12 µF total COUT when using standard 470 nH inductors and 2.2 µF CIN. Larger values require careful inrush current analysis per Equation (2) in the datasheet.
Is active output discharge enabled by default on the FAN53611AUC12X, and how is it controlled?
Yes, the FAN53611AUC12X variant ending in "AUC" (including FAN53611AUC12X) includes factory-enabled active output discharge. When EN is pulled low, a 230 Ω internal path discharges the FB node to GND, preventing floating voltages and ensuring predictable power-down sequencing-critical for multi-rail SoC systems with strict reset timing requirements.
FAN53611AUC12X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 6-UFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.3V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- Frequency - Switching:
- 6MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WLCSP (1.23x0.88)
FAN53611AUC12X FAQ
1.How can I place an order for FAN53611AUC12X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN53611AUC12X 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 FAN53611AUC12X reliable?
The price and inventory of FAN53611AUC12X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN53611AUC12X is usually 5 days.
3.What payment methods are accepted for FAN53611AUC12X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN53611AUC12X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN53611AUC12X?
FAN53611AUC12X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN53611AUC12X 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 FAN53611AUC12X?
For technical support, including FAN53611AUC12X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN53611AUC12X requirements.
6.How does Aetrix verify that FAN53611AUC12X is sourced from the original manufacturer or authorized distributors?
All FAN53611AUC12X 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 FAN53611AUC12X meets industry standards.
7.What is the process for return or replacement of FAN53611AUC12X?
All FAN53611AUC12X units undergo pre-shipment inspection (PSI). If there is an issue with FAN53611AUC12X, 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 FAN53611AUC12X part is unused and in its original packaging.
Return procedure for FAN53611AUC12X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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