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NXP Semiconductors MC34726CFCR2
- Part No.:
- MC34726CFCR2
- Manufacturer:
- NXP Semiconductors
- Package:
- 8-UFDFN
- Datasheet:
-
MC34726CFCR2.pdf
- Description:
- IC REG BUCK 3.3V 300MA 8USON
- Quantity:
- Payment:
- Shipping:
Inventory:3,891
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Product details
Overview
MC34726CFCR2 from Freescale Semiconductor is a 300 mA synchronous buck regulator with Z-mode architecture, designed for single-cell Li-Ion systems requiring high efficiency at light loads. It operates from 3.6–5.5 V input, delivers fixed 3.3 V output, switches at 2.0 MHz, and achieves 65 μA quiescent current in Sleepy Z-mode-enabling long battery life in portable medical sensors and low-power IoT endpoints.
For engineers reviewing the MC34726CFCR2 datasheet, MC34726CFCR2 pinout, MC34726CFCR2 application, or MC34726CFCR2 equivalent, key selection criteria include its 3.3 V factory-preset output, 2x2 UDFN-8 package footprint, Z-mode ripple suppression below 10 mA load, and thermal shutdown at 140°C junction temperature.
Technical Context
The MC34726CFCR2 implements voltage-mode PWM control with feed-forward compensation and Freescale's proprietary Z-mode architecture, which dynamically reduces switching frequency below 85% CCM duty cycle to minimize light-load switching losses. Its internal 2.0 MHz oscillator (±20% tolerance) drives integrated PMOS/NMOS power stages with RDS(ON) of 250 mΩ (high-side) and 350 mΩ (low-side) at 40°C.
Operation includes three distinct modes: continuous conduction mode (CCM) above ~10 mA, Z-mode (pulse-skipping) between ~1.0–10 mA, and Sleepy Z-mode below 1.0 mA-where oscillator frequency drops to 250 kHz and low-side FET is disabled to emulate asynchronous operation and reduce IQ to 65 μA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6–5.5 V - matches nominal Li-Ion cell voltage after regulation; excludes lower 2.7–3.5 V range used by other variants (e.g., MC34726AFC). |
| Output Voltage | Fixed 3.3 V - factory-programmed; eliminates external feedback resistors and ensures ±3% accuracy across load/temperature. |
| Max Continuous Output Current | 300 mA - sustained at full input/output range; requires minimum VIN > 2.8 V for full rating (per Table 1 Note 3). |
| Switching Frequency | 2.0 MHz (±20%) - enables use of compact 4.7 µH inductors and 4.7 µF ceramic capacitors; supports tight PCB layout. |
| Quiescent Current | 65 µA in Sleepy Z-mode - extends battery runtime in always-on sensor nodes; drops to 0.1 µA in shutdown. |
| Efficiency Peak | 94% - achieved at mid-load (e.g., 150 mA, VIN=3.6 V, VOUT=1.8 V); actual 3.3 V variant efficiency is ≥92% at 100 mA per Figure 4. |
| Thermal Shutdown Threshold | 140°C - protects die during overload; 10°C hysteresis ensures stable restart at 130°C. |
| UVLO Threshold | Rising: 2.7 V / Falling: 2.5 V - prevents erratic operation during brown-out; for 3.3 V output, VOUT tracks VIN down to 2.5 V before shutdown. |
Pinout & Package
MC34726CFCR2 is housed in an ultra-thin, Pb-free 2×2 mm UDFN-8 package (suffix FC), with exposed pad omitted (non-EP). Pin 6 is NC (internally unconnected) and must be externally tied to GND per datasheet guidance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power Input | 3.6–5.5 V DC supply; requires local 4.7 µF X5R ceramic bypass capacitor to minimize transient noise. |
| GND (Pins 2 & 3) | Ground Reference | Dual low-noise ground pins-Pin 2 is main GND, Pin 3 is dedicated low-noise GND for analog blocks; both must connect to system ground plane. |
| EN (Pin 4) | Enable Control | Active-high logic input (1.6 V threshold); connects directly to VIN for always-on operation or to microcontroller GPIO for sequencing. |
| FB (Pin 5) | Feedback Sense | Monitors regulated 3.3 V output directly; no external resistor divider needed due to factory-fixed output. |
| NC (Pin 6) | No Connection | Internally unconnected; must be externally connected to GND to ensure mechanical stability and EMI control. |
| SW (Pins 7 & 8) | Switching Node | Drain connection of internal high-side PMOS and low-side NMOS; routes to external inductor; requires short, low-inductance trace. |
Key Features
| Feature | Design Value |
|---|---|
| Z-mode pulse-skipping architecture | Reduces switching frequency under light load (<10 mA), cutting ripple and improving efficiency without external control circuitry. |
| Sleepy Z-mode operation | Disables low-side FET and lowers oscillator to 250 kHz below 1 mA, achieving 65 µA IQ while maintaining tight output regulation. |
| Integrated power MOSFETs | 250 mΩ high-side PMOS + 350 mΩ low-side NMOS eliminate external switches and gate drivers-reducing BOM count and layout area. |
| 2.0 ms internal soft-start | Prevents inrush current during power-up; ramp time is fixed and independent of input/output voltage or load-ensuring repeatable startup behavior. |
| Comprehensive protection suite | Includes cycle-by-cycle current limit (450 mA peak), thermal shutdown (140°C), UVLO (2.5/2.7 V), and short-circuit recovery (auto-restart below 0.5 V). |
| Ultra-compact UDFN-8 package | 2×2 mm footprint with 0.5 mm pitch enables high-density designs in space-constrained wearables and hearing aids. |
Applications
| Portable Medical Sensors | Low-Power IoT Endpoints |
|---|---|
|
Use Scenario: Continuous glucose monitor (CGM) with Bluetooth LE radio and electrochemical sensor front-end. IC Role / Device Role / Timing Role: Primary 3.3 V power rail generator for RF transceiver, ADC, and microcontroller-operating 24/7 on coin-cell or small Li-Ion. Use Value: Sleepy Z-mode extends battery life beyond 12 months by minimizing IQ during sensor sleep cycles; 2.0 MHz switching avoids RF interference bands. |
Use Scenario: Battery-powered environmental sensor node measuring temperature/humidity/CO₂ in smart building HVAC ducts. IC Role / Device Role / Timing Role: Main DC/DC converter supplying 3.3 V to ultra-low-power MCU and digital sensors during periodic wake-up bursts. Use Value: Z-mode maintains <15 mV output ripple at 1–5 mA loads-ensuring clean ADC reference and stable sensor biasing without added LDO post-regulation. |
| Wearable Audio Devices | Industrial Handheld Scanners |
|
Use Scenario: True wireless stereo (TWS) earbud with voice assistant, MEMS mic, and Class-D amplifier. IC Role / Device Role / Timing Role: Efficient 3.3 V supply for DSP and audio codec; handles dynamic load steps from 0.5 mA (idle) to 250 mA (playback). Use Value: Seamless CCM→Z-mode→Sleepy Z-mode transitions prevent audible pop/click artifacts during playback start/stop; 94% peak efficiency conserves limited battery capacity. |
Use Scenario: Ruggedized barcode scanner with OLED display, laser diode driver, and 802.11n Wi-Fi module. IC Role / Device Role / Timing Role: High-reliability 3.3 V source tolerant of wide ambient temperature (-25°C to +85°C) and mechanical shock-induced input transients. Use Value: Dual GND pins and robust UVLO (2.5 V falling threshold) maintain stable operation during battery sag under motor-driven trigger actuation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2108DQ-LF-Z | 300 mA, 2.5–5.5 V input, adjustable output (0.6–5 V), 1.5 MHz switching, 25 µA IQ (shutdown only), no Z-mode. | Lacks light-load efficiency optimization; requires external feedback resistors; better suited for cost-sensitive, non-battery applications. | Select when adjustable output or lower BOM cost outweighs need for sub-100 µA light-load IQ. |
| TPS62231DRYR | 300 mA, 2.05–6.0 V input, fixed 3.3 V output, 3.6 MHz switching, 17 µA IQ (forced PWM), no Z-mode; uses DCS-Control topology. | Higher switching frequency enables smaller passives but increases EMI risk near 2.4 GHz ISM band; no true pulse-skipping mode. | Select when board space is critical and system EMI filtering can accommodate 3.6 MHz harmonics. |
Compared with MP2108DQ-LF-Z and TPS62231DRYR, MC34726CFCR2 uniquely delivers 65 µA IQ in active light-load operation via Sleepy Z-mode-making it superior for multi-year battery life in intermittently active sensors, while retaining robust thermal/overcurrent protection and a proven 2x2 UDFN footprint.
Availability
MC34726CFCR2 is available at Aetrix Electronics and suitable for portable medical sensors, low-power IoT endpoints, wearable audio devices, and industrial handheld scanners requiring stable component supply and long-term lifecycle support.
Supply support for MC34726CFCR2 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
Freescale Semiconductor (now part of NXP Semiconductors) is a global leader in embedded processing and analog power solutions, specializing in automotive, industrial, and consumer ICs with emphasis on reliability and integration.
The MC34726 series was developed specifically for space-constrained, battery-powered applications demanding high light-load efficiency-targeting portable healthcare, wearables, and intelligent edge sensors where quiescent current and thermal performance are critical.
FAQ
What is the input voltage range supported by the MC34726CFCR2?
The MC34726CFCR2 supports an input voltage range of 3.6 V to 5.5 V, as specified in Table 1 for the "C" variant. This narrower range-compared to the broader 2.7–5.5 V range of other MC34726 variants-ensures optimal performance and reliability when paired with fully charged single-cell Li-Ion batteries or regulated 5 V rails. Operation below 3.6 V is not guaranteed and may result in UVLO activation or output dropout.
Does the MC34726CFCR2 require external feedback resistors to set its output voltage?
No, the MC34726CFCR2 does not require external feedback resistors. It features a factory-preset 3.3 V output, with the FB pin connected directly to the output node. This fixed-voltage configuration eliminates resistor tolerance errors, reduces component count, and improves long-term stability-critical for precision sensor and RF applications where output accuracy must remain within ±3% over temperature and load.
How does the Z-mode architecture in the MC34726CFCR2 improve efficiency at light loads?
The Z-mode architecture in the MC34726CFCR2 improves light-load efficiency by dynamically skipping switching pulses when the required duty cycle falls below 85% of the CCM value-reducing switching frequency and associated losses. For example, at 1 mA load, it transitions into Sleepy Z-mode, lowering oscillator frequency to 250 kHz and disabling the low-side FET, achieving just 65 µA quiescent current while maintaining tight output regulation and low ripple.
What protection features are integrated into the MC34726CFCR2?
The MC34726CFCR2 integrates five key protections: (1) cycle-by-cycle current limiting (450 mA peak), (2) thermal shutdown at 140°C with 10°C hysteresis, (3) undervoltage lockout (2.7 V rising / 2.5 V falling), (4) short-circuit recovery (auto-restart below 0.5 V output), and (5) 0.1 µA shutdown current. These features ensure robust operation in harsh environments like industrial scanners or medical devices without requiring external fault-handling circuitry.
Can the MC34726CFCR2 be used with a 4.7 µH inductor and 4.7 µF ceramic capacitors?
Yes, the MC34726CFCR2 is optimized for use with a 4.7 µH shielded inductor and 4.7 µF X5R ceramic capacitors on both input and output, as confirmed in Figures 1 and 16 of the datasheet. This combination ensures stable CCM operation up to 300 mA, meets ripple requirements (<15 mV typical), and fits within the 2×2 mm UDFN-8 footprint constraints-making it ideal for compact, high-volume portable designs.
MC34726CFCR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 8-UFDFN
- 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):
- 3.6V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 300mA
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -25°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-USON (2x2)
MC34726CFCR2 FAQ
1.How can I place an order for MC34726CFCR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC34726CFCR2 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 MC34726CFCR2 reliable?
The price and inventory of MC34726CFCR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34726CFCR2 is usually 5 days.
3.What payment methods are accepted for MC34726CFCR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34726CFCR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC34726CFCR2?
MC34726CFCR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC34726CFCR2 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 MC34726CFCR2?
For technical support, including MC34726CFCR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34726CFCR2 requirements.
6.How does Aetrix verify that MC34726CFCR2 is sourced from the original manufacturer or authorized distributors?
All MC34726CFCR2 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 MC34726CFCR2 meets industry standards.
7.What is the process for return or replacement of MC34726CFCR2?
All MC34726CFCR2 units undergo pre-shipment inspection (PSI). If there is an issue with MC34726CFCR2, 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 MC34726CFCR2 part is unused and in its original packaging.
Return procedure for MC34726CFCR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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