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onsemi FAN5365UC00X
- Part No.:
- FAN5365UC00X
- Manufacturer:
- onsemi
- Package:
- 9-UFBGA, WLCSP
- Datasheet:
-
FAN5365UC00X.pdf
- Description:
- IC REG BUCK PROG 800MA 9WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,010
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Product details
Overview
FAN5365UC00X from ON Semiconductor (formerly Fairchild) is a digitally programmable synchronous step-down DC-DC regulator optimized for mobile processor core and memory power delivery. It delivers up to 800mA output current, operates at 6MHz fixed-frequency PWM mode with ±2% DC voltage accuracy, supports I²C interface up to 3.4Mbps, and maintains regulation across 2.3V–5.5V input range - ideal for single-cell Li-ion powered smartphones and data cards.
For engineers reviewing the FAN5365UC00X datasheet, pinout, applications, or equivalent options, key selection considerations include its 9-bump WLCSP-09 package, 6-bit programmable VOUT (0.75–1.4375V), PFM/PWM seamless transition, 40µA light-load quiescent current, and hardware-enforced soft-start with 20V/ms slew rate.
Technical Context
The FAN5365UC00X implements a non-linear, ultra-fast transient response control architecture enabling stable operation with only a 470nH inductor and minimal ceramic capacitance. Its dual-mode operation - forced 6MHz PWM under moderate/heavy load and high-efficiency PFM at light loads - ensures >88% peak efficiency while maintaining sub-2% DC accuracy and <4mVP-P ripple in PWM mode.
It integrates a full I²C-compatible serial interface supporting Standard, Fast, Fast Plus, and High-Speed modes (up to 3.4Mbps), enabling dynamic voltage scaling in 12.5mV steps, real-time PFM/PWM mode switching, and programmable slew rate control. Protection includes thermal shutdown (150°C), over-current limiting (1.15–1.6A depending on option), and UVLO with 160mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 800mA max - sufficient for low-power DSP cores and GPU voltage domains in portable devices |
| Input Voltage Range | 2.3V to 5.5V - compatible with single-cell Li-ion battery (2.7–4.2V nominal) plus margin |
| Output Voltage Range | 0.75V to 1.4375V in 12.5mV steps - matches SmartReflex™-compliant DVFS requirements |
| Switching Frequency | 6MHz nominal (5.4–6.6MHz) - enables ultra-small 470nH inductor and compact PCB layout |
| I²C Interface Speed | Up to 3.4Mbps - supports high-speed dynamic voltage scaling without bus contention |
| Quiescent Current (PFM) | 40µA typical - extends battery runtime during idle/sleep states in always-on subsystems |
| DC Voltage Accuracy | ±2% in auto PWM/PFM mode - ensures reliable logic-level compliance for 1.0V–1.2V core rails |
Pinout & Package
Package: 9-bump Wafer-Level Chip-Scale Package (WLCSP), 1.27 × 1.29 mm, 0.4 mm pitch, bottom-side solder bumps.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | VSEL | Hardware voltage select input - sets default VOUT between two pre-programmed values (VSEL0/VSEL1); overridden by I²C register writes |
| A2 | VIN | Main power input - connects directly to battery or PMIC output; requires short, low-inductance path to CIN |
| A3 | SDA | I²C serial data line - bidirectional, open-drain; must be pulled up externally per I²C spec |
| B1 | SW | Switching node - connects to inductor; carries high di/dt; requires tight loop area with PGND |
| B2 | SCL | I²C serial clock line - input-only, open-drain; must be pulled up externally |
| B3 | EN | Enable control - active-high; asserts internal soft-start and enables regulator when pulled high |
| C1 | VOUT | Output voltage feedback monitor - high-impedance input tied to COUT; no DC current flow |
| C2 | PGND | Power ground - return path for internal MOSFETs and gate drivers; connects to PCB power plane |
| C3 | AGND | Analog ground - reference for internal error amplifier and DAC; must tie to PGND at single point |
Key Features
| Feature | Design Value |
|---|---|
| 6MHz fixed-frequency PWM + PFM light-load mode | Enables use of 470nH inductor and 10µF output capacitor - reduces solution size by >40% vs. 1–2MHz converters |
| 6-bit I²C-programmable VOUT (0.75–1.4375V) | Supports precise DVFS in 12.5mV increments - meets SmartReflex™ Level 3 compliance for OMAP™/XSCALE™ processors |
| 20V/ms soft-start slew rate | Prevents input current surge and output overshoot during startup into pre-biased loads - eliminates need for external sequencing |
| ±2% DC output accuracy (PWM mode) | Guarantees stable core voltage under varying line/load conditions - avoids timing violations in sub-1V digital logic |
| Thermal shutdown with 20°C hysteresis | Protects against sustained overload without latch-up - allows automatic recovery after cooling, reducing system fault handling complexity |
Applications
| Smartphone Core Power | Data Card DSP Supply |
|---|---|
|
Use Scenario: Powering ARM Cortex-A series CPU cores in LTE smartphones requiring dynamic voltage/frequency scaling. IC Role / Device Role / Timing Role: Primary core rail regulator delivering 0.75–1.2V at up to 800mA with µs-scale transient response. Use Value: 6MHz switching enables fast load-step recovery (<5µs to settle within 2%) and eliminates need for large bulk capacitance. |
Use Scenario: Supplying TI TMS320C64x+ DSP in 3G/WiMAX data cards with strict EMI and size constraints. IC Role / Device Role / Timing Role: Digitally programmable buck converter interfacing via I²C to host controller for real-time VDD scaling. Use Value: 3.4Mbps I²C support allows voltage reconfiguration in <250µs - faster than competing 400kHz I²C solutions. |
| Ultra-Mobile PC Memory Rail | Handheld GPU Core Supply |
|
Use Scenario: Generating 1.05–1.20V for LPDDR2 memory interfaces in netbooks and UMPCs. IC Role / Device Role / Timing Role: Low-noise, high-PSRR regulator with <4mVP-P ripple in PWM mode to meet memory timing jitter specs. Use Value: 40µA PFM quiescent current extends standby battery life without sacrificing wake-up latency. |
Use Scenario: Powering NVIDIA Tegra or Qualcomm Adreno GPU cores in Android tablets requiring burst-mode efficiency. IC Role / Device Role / Timing Role: Synchronous buck with seamless PWM-to-PFM transition to maintain >85% efficiency from 1mA to 800mA. Use Value: 25ns minimum on-time supports high VIN-to-VOUT conversion ratios (e.g., 4.2V→0.75V) without pulse-skipping artifacts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digitally programmable buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62260DRVR | 3MHz max switching frequency; 600mA output; 2.05–6.0V input; I²C interface not supported - uses hardware pins for VOUT selection | Lacks dynamic voltage scaling capability; suited for fixed-output or coarse-step applications only | Select when I²C control is unnecessary and board space allows larger inductor (≥1µH) |
| RTQ2132BGQW | 4MHz switching; 1A output; 2.5–5.5V input; supports I²C but limited to 1Mbps; no PFM mode - forced PWM only | Higher quiescent current (120µA) reduces light-load efficiency; less suitable for battery-critical designs | Select when higher output current and tighter input range are prioritized over ultra-low IQ and seamless mode transition |
Compared with TPS62260DRVR and RTQ2132BGQW, the FAN5365UC00X uniquely combines 6MHz operation, true I²C-based DVFS, 40µA PFM IQ, and hardware-programmable defaults - making it optimal for space-constrained, battery-sensitive SmartReflex™ systems where rapid voltage agility and minimal solution footprint are critical.
Availability
FAN5365UC00X is available at Aetrix Electronics and suitable for smartphone core power, data card DSP supply, and ultra-mobile PC memory rail applications requiring stable component supply, long-term lifecycle support, and traceable sourcing from authorized channels.
Supply support for FAN5365UC00X 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
ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and mobile markets.
The FAN5365UC00X belongs to ON Semiconductor's high-frequency DC-DC regulator product line, designed specifically for mobile and portable electronics demanding ultra-small footprints, dynamic voltage scaling, and single-cell Li-ion compatibility.
FAQ
What is the default output voltage of the FAN5365UC00X at power-up?
The FAN5365UC00X powers up with VOUT set to 1.05V (VSEL0) or 1.20V (VSEL1), depending on the logic state of the VSEL pin. For FAN5365UC00X specifically, the power-up default is 1.05V when VSEL = LOW and 1.20V when VSEL = HIGH - these values are factory-programmed and confirmed in the Ordering Information table. The FAN5365UC00X can be reprogrammed via I²C to any value between 0.75V and 1.4375V in 12.5mV steps.
Does the FAN5365UC00X support true I²C high-speed mode?
Yes, the FAN5365UC00X supports I²C high-speed mode up to 3.4Mbps, as verified in the I²C Timing Specifications table (page 7). It meets JEDEC HS-mode timing requirements including tRCL1 ≤ 80ns and tHD;DAT ≥ 70ns for CB < 100pF. This enables sub-250µs voltage reconfiguration - critical for dynamic power management in OMAP™ and XSCALE™ platforms using the FAN5365UC00X.
What is the minimum inductor value recommended for stable operation of the FAN5365UC00X?
The FAN5365UC00X is characterized and optimized for a 470nH inductor, with a specified tolerance range of 390–600nH (Table 1). Using an inductor below 390nH risks violating the 25ns minimum on-time limit and may cause instability or pulse-skipping at high VIN-to-VOUT ratios. The 470nH value enables full 6MHz operation while maintaining >88% efficiency and meeting transient response specs in the FAN5365UC00X typical application circuit.
How does the FAN5365UC00X handle output short-circuit conditions?
The FAN5365UC00X responds to sustained output short-circuit with cycle-by-cycle current limiting followed by thermal shutdown at 150°C. During over-current events, it enters hiccup mode: shutting down for a fixed delay (~ms range), then attempting restart. This limits average power dissipation and prevents damage. The FAN5365UC00X does not latch off permanently - it autonomously recovers once the fault clears and temperature drops below 130°C (20°C hysteresis), ensuring robustness in handheld device environments.
Can the FAN5365UC00X operate with a 1.8V I²C bus voltage?
Yes, the FAN5365UC00X supports I²C interface operation with VCCIO (SDA/SCL pull-up voltage) from 1.2V to 2.0V, as specified in the Recommended Operating Conditions table (page 4). At 1.8V, it meets all Fast Mode Plus timing requirements (tHD;DAT ≥ 450ns, fSCL ≤ 1MHz) and remains fully compatible with 1.8V logic families. This allows direct interfacing with application processors and microcontrollers using 1.8V I/O without level-shifting when implementing the FAN5365UC00X in system designs.
FAN5365UC00X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 9-UFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.3V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.75V
- Voltage - Output (Max):
- 1.44V
- Current - Output:
- 800mA
- Frequency - Switching:
- 6MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 9-WLCSP (1.22x1.22)
FAN5365UC00X FAQ
1.How can I place an order for FAN5365UC00X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN5365UC00X 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 FAN5365UC00X reliable?
The price and inventory of FAN5365UC00X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN5365UC00X is usually 5 days.
3.What payment methods are accepted for FAN5365UC00X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN5365UC00X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN5365UC00X?
FAN5365UC00X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN5365UC00X 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 FAN5365UC00X?
For technical support, including FAN5365UC00X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN5365UC00X requirements.
6.How does Aetrix verify that FAN5365UC00X is sourced from the original manufacturer or authorized distributors?
All FAN5365UC00X 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 FAN5365UC00X meets industry standards.
7.What is the process for return or replacement of FAN5365UC00X?
All FAN5365UC00X units undergo pre-shipment inspection (PSI). If there is an issue with FAN5365UC00X, 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 FAN5365UC00X part is unused and in its original packaging.
Return procedure for FAN5365UC00X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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