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onsemi FAN53611AUC123X
- Part No.:
- FAN53611AUC123X
- Manufacturer:
- onsemi
- Package:
- 6-UFBGA, WLCSP
- Datasheet:
-
FAN53611AUC123X.pdf
- Description:
- IC REG BUCK 1.233V 1A 6WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:4,740
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Product details
Overview
FAN53611AUC123X from onsemi is a 6 MHz, 1 A synchronous buck regulator in WLCSP-6 package delivering a fixed 1.233 V output from 2.3–5.5 V input. It features 24 µA quiescent current in PFM mode, internal soft-start, UVLO, thermal shutdown, and optional active output discharge - optimized for space-constrained mobile power rails in tablets and data cards.
For engineers reviewing the FAN53611AUC123X datasheet, pinout, applications, or equivalent options, key selection criteria include its 1.233 V output accuracy (±3.9% over 0–1 A), 6 MHz fixed-frequency operation enabling 470 nH inductor/4.7 µF capacitor use, forced PWM capability via MODE pin, and WLCSP-6 thermal performance (θJA = 125°C/W).
Technical Context
The FAN53611AUC123X employs a proprietary non-linear fixed-frequency PWM modulator with seamless auto-transition between continuous conduction mode (CCM) and discontinuous conduction mode (DCM) PFM at light loads. Its architecture maintains constant 6 MHz switching across input voltage (2.3–5.5 V) and load (0–1 A) ranges using an internal frequency loop, independent of output capacitor ESR.
Control logic includes a Schmitt-triggered MODE pin supporting both forced PWM and external clock synchronization (1.3–1.7 MHz input → 5.2–6.8 MHz sync), EN pin with 0.4 V low-threshold shutdown (<1 µA ISD), and integrated protection: cycle-by-cycle current limiting (1.5–2.0 A open-loop peak), thermal shutdown at 150°C (15°C hysteresis), and UVLO with 2.27 V rising threshold and 200 mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.233 V ±3.9% (1.185–1.281 V) over 0–1 A load and –40°C to +85°C |
| Max Output Current | 1 A DC, supported by 1.5–2.0 A open-loop PMOS current limit |
| Switching Frequency | 6 MHz nominal fixed frequency; enables ultra-small 470 nH inductor and 4.7 µF ceramic output capacitor |
| Quiescent Current | 24 µA typical in auto PFM/PWM mode; drops to ≤1 µA in shutdown |
| Input Voltage Range | 2.3 V to 5.5 V - supports single-cell Li-ion, USB, and wide-input portable rails |
| Efficiency | Peak 92% at mid-load; >80% maintained down to 1 mA load |
| Package | 6-bump WLCSP, 0.4 mm pitch, 1.16 × 0.86 mm footprint, 586 µm typical height |
Pinout & Package
Package: 6-bump Wafer-Level Chip-Scale Package (WLCSP), 0.4 mm pitch, bumps facing down in standard mounting orientation. Dimensions: 1.160 mm × 0.860 mm × 0.586 mm (typ). Thermal resistance θJA = 125°C/W on 4-layer JEDEC board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | MODE | Logic-controlled mode select: HIGH forces PWM; LOW enables auto PFM/PWM transition; also accepts 1.3–1.7 MHz sync signal (×4 output) |
| B1 | SW | Switching node - connects directly to inductor; carries high di/dt pulsed current; requires low-inductance layout |
| C1 | FB | Feedback input - senses regulated output voltage; internal resistor divider sets 1.233 V reference |
| C2 | GND | Power and IC ground - primary return path for SW, VIN, and FB; must connect to solid ground plane under package |
| B2 | EN | Enable input - active HIGH (>1.2 V); <0.4 V disables regulator and activates shutdown (<1 µA ISD) |
| A2 | VIN | Main input supply - accepts 2.3–5.5 V; requires local 2.2 µF ceramic capacitor placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 24 µA typical in light-load PFM mode preserves battery life without sacrificing transient response |
| 6 MHz fixed-frequency operation | Enables smallest possible passive components: 470 nH inductor + 4.7 µF output capacitor fit in <1.5 mm² area |
| Internal soft-start | Controlled 50 mV/µs slew rate to 1 V, then 12.5 mV/µs to final setpoint - prevents inrush and overshoot |
| Active output discharge option | 230 Ω internal discharge path to GND when EN = LOW - ensures rapid VOUT decay for system sequencing |
| Robust protection suite | Includes UVLO (2.27 V), thermal shutdown (150°C), cycle-by-cycle current limit, and hiccup-mode fault recovery |
Applications
| Mobile Data Cards | Tablets |
|---|---|
|
Use Scenario: Powering baseband processor core rails in LTE/WiMAX/WiBro data cards with tight PCB area constraints. IC Role / Device Role / Timing Role: Primary 1.233 V core supply delivering up to 1 A with fast load transients during burst data transmission. Use Value: 6 MHz switching minimizes inductor size; 24 µA quiescent current extends standby time; WLCSP-6 footprint saves >50% board area vs. QFN alternatives. |
Use Scenario: Supplying application processor I/O or GPU voltage domains in sub-10″ tablets requiring high efficiency across dynamic load profiles. IC Role / Device Role / Timing Role: Secondary buck converter regulating 1.233 V rail with seamless PFM-to-PWM transition during video playback or UI rendering. Use Value: >80% efficiency at 1 mA enables always-on sensors; 92% peak efficiency reduces thermal load; MODE pin allows system-level frequency coordination. |
| Digital Still Cameras | Ultra-Mobile PCs |
|
Use Scenario: Powering image sensor interface or ISP core in compact DSC/DVC platforms where thermal headroom is limited. IC Role / Device Role / Timing Role: Fixed-output buck regulator providing stable 1.233 V with low noise and minimal output ripple for analog pixel readout. Use Value: Low 200 mVpp ripple at 100 mA (Figure 16) ensures clean analog supply; PSRR >60 dB at 100 kHz (Figure 32) suppresses digital noise coupling. |
Use Scenario: Regulating DDR memory termination or SoC auxiliary rails in fanless UMPC designs requiring silent, reliable operation. IC Role / Device Role / Timing Role: High-density point-of-load regulator delivering 1 A with thermal shutdown (150°C) and hiccup-mode fault recovery. Use Value: WLCSP-6 package enables placement directly under BGA; 125°C/W θJA supports sustained 1 A loads without heatsink; UVLO prevents brownout instability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRVR | 1.23 V output, 600 mA, 3–6 V input, 3.6 MHz, 22 µA IQ, WSON-6 (2 × 2 mm) | Limited to 600 mA; lower max current unsuitable for 1 A peak loads in data cards | Select if 600 mA suffices and larger WSON-6 footprint is acceptable; not drop-in due to different pinout and current rating |
| RT7295BGJ6F | 1.23 V output, 1 A, 2.5–5.5 V input, 2 MHz, 35 µA IQ, WDFN-6 (2 × 2 mm) | Half the switching frequency → requires ~2× larger inductor/capacitor; higher IQ reduces light-load efficiency | Choose for cost-sensitive designs where board area is less constrained; verify thermal performance at 1 A with 2 MHz operation |
Compared with TPS62231DRVR and RT7295BGJ6F, the FAN53611AUC123X delivers full 1 A capability in the smallest footprint (1.16 × 0.86 mm), highest switching frequency (6 MHz), and lowest quiescent current (24 µA) - making it optimal for ultra-compact, battery-sensitive mobile applications demanding both peak current and standby efficiency.
Availability
FAN53611AUC123X is available at Aetrix Electronics and suitable for mobile data cards, tablets, digital still cameras, and ultra-mobile PCs requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for FAN53611AUC123X 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 electronics, with leadership in power management, analog, sensors, and connectivity solutions.
The FAN53611AUC123X belongs to onsemi's high-frequency synchronous buck regulator product line, engineered specifically for space- and efficiency-critical portable applications including 3G/4G/WiFi data cards and thin-client computing devices.
FAQ
What is the output voltage tolerance of the FAN53611AUC123X over temperature and load?
The FAN53611AUC123X delivers a nominal 1.233 V output with ±3.9% tolerance (1.185–1.281 V) across the full operating range: 0–1 A load, –40°C to +85°C ambient, and 2.3–5.5 V input. This specification is verified in the Electrical Characteristics table (page 4) under "VO Output Voltage Accuracy" for the 1.233 V variant, with tighter ±3.2% (1.192–1.274 V) in PWM-only mode.
Does the FAN53611AUC123X support external clock synchronization, and what is the required input frequency?
Yes, the FAN53611AUC123X supports external clock synchronization via the MODE pin. When a square wave with frequency between 1.3 MHz and 1.7 MHz is applied to MODE, the regulator synchronizes its switching frequency to exactly four times the input frequency (5.2–6.8 MHz). This capability is documented in the Electrical Characteristics table (page 4) under "fSYNC MODE Synchronization Range".
What is the purpose of the active output discharge feature in the FAN53611AUC123X, and how is it enabled?
The active output discharge feature in the FAN53611AUC123X provides a 230 Ω internal path from FB to GND when EN is pulled LOW, rapidly discharging the output capacitor to prevent floating or unintended biasing of downstream circuitry. This variant (FAN53611AUC123X) includes active discharge, as confirmed in the Ordering Information table (page 2) where "Yes" is listed under "Active Discharge" for this part number.
What are the minimum recommended external components for the FAN53611AUC123X?
The FAN53611AUC123X requires three external components: a 470 nH shielded inductor (e.g., Murata LQM21PNR47MC0), a 2.2 µF X5R 0402 input capacitor placed adjacent to VIN/GND, and a 4.7 µF X5R 0402 output capacitor. These values are specified in the Recommended Operating Conditions table (page 3) and validated in Figure 1 for typical application.
How does the FAN53611AUC123X manage thermal performance in high-current operation?
The FAN53611AUC123X incorporates thermal shutdown activation at 150°C junction temperature with 15°C hysteresis, and its WLCSP-6 package achieves θJA = 125°C/W on a standard 4-layer JEDEC board. Under 1 A load at 5.5 V input, thermal simulations confirm safe operation below 125°C junction limit with proper PCB copper area - as validated in the Thermal Properties section (page 3) and Typical Performance Figures (e.g., Figure 5).
FAN53611AUC123X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 6-UFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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):
- 1.233V
- 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)
FAN53611AUC123X FAQ
1.How can I place an order for FAN53611AUC123X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN53611AUC123X 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 FAN53611AUC123X reliable?
The price and inventory of FAN53611AUC123X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN53611AUC123X is usually 5 days.
3.What payment methods are accepted for FAN53611AUC123X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN53611AUC123X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN53611AUC123X?
FAN53611AUC123X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN53611AUC123X 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 FAN53611AUC123X?
For technical support, including FAN53611AUC123X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN53611AUC123X requirements.
6.How does Aetrix verify that FAN53611AUC123X is sourced from the original manufacturer or authorized distributors?
All FAN53611AUC123X 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 FAN53611AUC123X meets industry standards.
7.What is the process for return or replacement of FAN53611AUC123X?
All FAN53611AUC123X units undergo pre-shipment inspection (PSI). If there is an issue with FAN53611AUC123X, 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 FAN53611AUC123X part is unused and in its original packaging.
Return procedure for FAN53611AUC123X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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