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onsemi FAN53611AUC135X
- Part No.:
- FAN53611AUC135X
- Manufacturer:
- onsemi
- Package:
- 6-UFBGA, WLCSP
- Datasheet:
-
FAN53611AUC135X.pdf
- Description:
- IC REG BUCK 1.35V 1A 6WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:4,129
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Product details
Overview
FAN53611AUC135X from onsemi is a 6 MHz, 1 A synchronous buck regulator in WLCSP-6 package delivering a fixed 1.35 V output from 2.3–5.5 V input. It features 24 µA quiescent current in PFM mode, internal soft-start, forced PWM operation, and active output discharge-optimized for space-constrained mobile power rails in tablets and data cards.
For engineers reviewing the FAN53611AUC135X datasheet, pinout, applications, or equivalent options, key selection criteria include its 1.35 V output accuracy (±3.7% over 0–1 A load), 6 MHz fixed-frequency operation enabling 470 nH inductors, thermal shutdown at 150°C, and MODE pin synchronization capability up to 1.7 MHz.
Technical Context
The FAN53611AUC135X employs a proprietary non-linear fixed-frequency PWM modulator with seamless auto-transition between continuous conduction mode (CCM) and discontinuous conduction mode (DCM) PFM-ensuring fast load transient response while maintaining stable 6 MHz switching across 2.3–5.5 V input and 0–1 A load. Its synchronous rectification architecture achieves 92% peak efficiency and >80% efficiency down to 1 mA load.
Control logic integrates UVLO (2.27 V rising threshold), internal soft-start (300 µs typical), and cycle-by-cycle current limiting with hiccup-mode fault recovery. The MODE pin enables forced PWM, external clock synchronization (×4 multiplication), and Schmitt-triggered input tolerance for slow edges-without requiring external compensation components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.35 V ±3.7% (1.298–1.402 V) over 0–1 A load and –40°C to +85°C ambient |
| Max Output Current | 1 A DC continuous-supports high-efficiency power delivery to core logic or memory rails |
| 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 PFM mode-extends battery life in always-on subsystems without sacrificing transient response |
| Input Voltage Range | 2.3 V to 5.5 V-compatible with single-cell Li-ion, Li-polymer, and USB-powered systems |
| Thermal Shutdown | Activates at 150°C junction temperature with 15°C hysteresis-prevents permanent damage during sustained overload |
| Output Discharge | Active discharge path (230 Ω) enabled when EN = GND-ensures rapid VOUT decay for safe sequencing |
Pinout & Package
Package: Wafer-Level Chip-Scale Package (WLCSP-6), 0.4 mm pitch, 1.16 mm × 0.86 mm footprint, 586 µm typical height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | MODE | Configures operating mode: logic high forces PWM; logic low enables auto PFM/PWM transition; also accepts external sync signal (1.3–1.7 MHz) |
| B1 | SW | Switching node-connects directly to inductor; carries high di/dt current and requires tight layout to minimize EMI |
| C1 | FB | Feedback input-monitors regulated output voltage; internal resistor divider sets 1.35 V reference |
| C2 | GND | Power and signal ground-must be low-impedance connection shared with CIN and COUT grounds |
| B2 | EN | Enable control-device powers up when voltage exceeds 1.2 V; shuts down below 0.4 V with <1 µA supply current |
| A2 | VIN | Main input supply-accepts 2.3–5.5 V; requires local 2.2 µF ceramic decoupling placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Best-in-class load transient response | Sub-100 ns edge handling with minimal overshoot/undershoot-critical for CPU/GPU core rail stability |
| Low-ripple light-load PFM mode | 24 µA IQ with controlled single-pulse operation-reduces output ripple vs. conventional burst-mode regulators |
| Forced PWM and external sync | Eliminates frequency variation in noise-sensitive applications; supports system-level clock domain alignment |
| Internal soft-start | 300 µs typical ramp time with exponential reference shaping-prevents inrush current and output overshoot |
| Thermal & overload protection | Hiccup-mode restart after 16-cycle current limit detection-limits average power dissipation during short-circuit faults |
Applications
| Mobile Data Cards | Tablets |
|---|---|
|
Use Scenario: Powering baseband processor and RF transceiver in 4G/LTE/WiMAX data cards with aggressive size constraints. IC Role / Device Role / Timing Role: Primary point-of-load (POL) regulator converting single-cell battery (3.0–4.2 V) to 1.35 V core supply. Use Value: 6 MHz switching allows 0402-sized 470 nH inductor and 4.7 µF output capacitor-reducing total solution area by >40% vs. 1–2 MHz alternatives. |
Use Scenario: Supplying application processor I/O or GPU memory interface in thin-profile tablets. IC Role / Device Role / Timing Role: High-efficiency synchronous buck converter delivering stable 1.35 V at up to 1 A with fast dynamic response. Use Value: 92% peak efficiency and >80% efficiency at 1 mA enable extended standby time without compromising wake-up performance. |
| Digital Still Cameras | Ultra-Mobile PCs |
|
Use Scenario: Powering image signal processor (ISP) and sensor interface circuitry in compact DSC/DVC platforms. IC Role / Device Role / Timing Role: Low-noise POL regulator with active output discharge for clean power sequencing during camera startup/shutdown. Use Value: Active discharge (230 Ω path) ensures FB pin decays rapidly-preventing latch-up or false wake events in multi-rail systems. |
Use Scenario: Regulating core voltage for Intel Atom or ARM-based UMPC SoCs operating under variable thermal limits. IC Role / Device Role / Timing Role: Thermally robust buck converter with 150°C shutdown and 125°C/W θJA-maintaining regulation under sustained 1 A load in confined enclosures. Use Value: Thermal hysteresis (15°C) prevents oscillation near trip point, ensuring reliable operation during ambient temperature cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | 1.35 V fixed output, 600 mA max, 3.6 MHz switching, no MODE pin sync, no active discharge | Limited to lower current; lacks external clock synchronization and output discharge-unsuitable for 1 A loads or strict sequencing | Select only if load ≤600 mA and system-level clock sync is unnecessary |
| RTQ2132BGQW | 1.35 V fixed output, 1.2 A max, 2.5 MHz switching, integrated MOSFETs, no PFM mode, 30 µA IQ | Lower switching frequency increases inductor/capacitor size; no light-load PFM reduces battery runtime in idle states | Prefer for cost-sensitive designs where board area is less critical than absolute lowest BOM count |
Compared with TPS62231DRYR and RTQ2132BGQW, the FAN53611AUC135X uniquely combines 1 A capability, 6 MHz operation, PFM/PWM auto-transition, and active discharge-making it optimal for space-constrained, battery-powered applications demanding both high efficiency and precise power sequencing.
Availability
FAN53611AUC135X 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.
Supply support for FAN53611AUC135X 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 FAN53611AUC135X belongs to the FAN536xx family of high-frequency synchronous buck regulators-designed specifically for portable consumer devices requiring ultra-compact, high-efficiency DC-DC conversion with minimal external components.
FAQ
What is the output voltage tolerance of the FAN53611AUC135X over full load and temperature?
The FAN53611AUC135X delivers a nominal 1.35 V output with ±3.7% tolerance (1.298 V to 1.402 V) across 0–1 A load and –40°C to +85°C ambient temperature, as specified in the Electrical Characteristics table under "VO Output Voltage Accuracy" for the 1.35 V variant. This includes both line and load regulation effects in PWM mode.
Does the FAN53611AUC135X require external compensation components?
No, the FAN53611AUC135X uses an internally compensated control loop and requires no external compensation components. Its proprietary architecture maintains stability with standard 470 nH inductors and 4.7 µF ceramic output capacitors across the full operating range, simplifying design and reducing bill-of-materials count.
How does the MODE pin function on the FAN53611AUC135X?
The MODE pin on the FAN53611AUC135X serves three functions: (1) logic high forces fixed-frequency PWM operation; (2) logic low enables automatic PFM/PWM transition at light loads; (3) applying a 1.3–1.7 MHz square wave synchronizes switching frequency to 4× that input-enabling system-level clock domain alignment without additional timing circuitry.
What is the purpose of the active output discharge feature in the FAN53611AUC135X?
The active output discharge feature in the FAN53611AUC135X provides a 230 Ω resistive path from FB to GND when EN is pulled low, ensuring rapid decay of the output voltage during shutdown. This prevents floating outputs, avoids unintended device wake-up, and supports clean power sequencing in multi-rail systems-especially critical in mobile applications with strict reset timing requirements.
Can the FAN53611AUC135X operate with input voltages below 2.3 V?
No-the FAN53611AUC135X has a recommended minimum input voltage of 2.3 V per the Recommended Operating Conditions table. Below this, UVLO prevents operation; the absolute maximum rating allows only –0.3 V to 7.0 V, but functional operation is not guaranteed below 2.3 V. Attempting operation at 2.2 V or lower may result in unstable regulation or failure to start.
FAN53611AUC135X 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):
- 1.35V
- 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)
FAN53611AUC135X FAQ
1.How can I place an order for FAN53611AUC135X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN53611AUC135X 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 FAN53611AUC135X reliable?
The price and inventory of FAN53611AUC135X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN53611AUC135X is usually 5 days.
3.What payment methods are accepted for FAN53611AUC135X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN53611AUC135X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN53611AUC135X?
FAN53611AUC135X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN53611AUC135X 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 FAN53611AUC135X?
For technical support, including FAN53611AUC135X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN53611AUC135X requirements.
6.How does Aetrix verify that FAN53611AUC135X is sourced from the original manufacturer or authorized distributors?
All FAN53611AUC135X 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 FAN53611AUC135X meets industry standards.
7.What is the process for return or replacement of FAN53611AUC135X?
All FAN53611AUC135X units undergo pre-shipment inspection (PSI). If there is an issue with FAN53611AUC135X, 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 FAN53611AUC135X part is unused and in its original packaging.
Return procedure for FAN53611AUC135X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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