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STMicroelectronics L6926D1
- Part No.:
- L6926D1
- Manufacturer:
- STMicroelectronics
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
L6926D1.pdf
- Description:
- IC REG BUCK ADJ 800MA 8VFSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,788
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Product details
Overview
L6926D1 from STMicroelectronics is a monolithic synchronous step-down DC-DC regulator designed for single-cell Li-ion battery-powered systems. It operates from 2 V to 5.5 V input, delivers up to 800 mA output current, supports adjustable output down to 0.6 V, achieves up to 95% efficiency, and features integrated high- and low-side MOSFETs with 600 kHz fixed-frequency current-mode control.
For engineers reviewing the L6926D1 datasheet, L6926D1 pinout, L6926D1 application, or L6926D1 equivalent, key selection considerations include its 100% duty-cycle low-dropout capability, selectable low-noise/low-consumption light-load modes, Power Good signal, ±1% output voltage accuracy, and external synchronization support from 500 kHz to 1.4 MHz.
Technical Context
The L6926D1 implements a slope-compensated current-mode PWM architecture with internal 0.6 V reference and error amplifier. Its peak/valley current limiting (1.2 A typ. peak, 1.4 A typ. valley) enables robust short-circuit protection while maintaining regulation under heavy transient loads.
Operation mode is selected via the SYNC pin: logic-high enables discontinuous conduction low-consumption mode (25 µA typ. quiescent current), logic-low activates continuous 600 kHz low-noise mode, and externally applied clock (500–1400 kHz) forces synchronized low-noise operation with automatic cycle-skipping at light load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2 V to 5.5 V - supports full discharge curve of single Li-ion cell (2.7 V–4.2 V) without dropout |
| Output Current | 800 mA max - sufficient for core logic and RF sections in portable instruments and handheld terminals |
| Switching Frequency | 600 kHz fixed or 500–1400 kHz externally synchronized - enables EMI-controlled layout and noise-sensitive system integration |
| Quiescent Current | 25 µA (low-consumption mode) - extends battery runtime in standby or sleep states |
| Output Accuracy | ±1% over temperature - ensures stable supply for precision analog and digital circuitry |
| Power Good Threshold | 90% of regulated VOUT - provides reliable power sequencing and fault detection for downstream processors |
| Thermal Shutdown | 150 °C junction - protects against sustained overload or poor PCB thermal design |
Pinout & Package
Package: TSSOP8 (3 mm × 3 mm × 1.0 mm, ECOPACK® compliant). Exposed pad (E-pad) must be soldered to GND plane for optimal thermal performance and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN | Enable/shutdown control input | Logic-high (>1.3 V) enables regulator; logic-low (<0.4 V) disables with ≤0.2 µA shutdown current |
| COMP | Error amplifier output | Connects to RC compensation network (e.g., 220 pF to GND); sets loop stability and transient response |
| VFB | Feedback input | Senses resistor divider output; regulates VOUT = 0.6 V × (1 + R2/R1); reference accuracy ±1% |
| GND | Power and signal ground | Common return path for internal switches, error amplifier, and PGOOD; ties to E-pad |
| LX | Switch node | Drain connection of internal high- and low-side MOSFETs; requires low-ESR ceramic output capacitor |
| VCC | Input supply | Accepts 2–5.5 V; includes 100 mV UVLO hysteresis and internal LDO for bias generation |
| SYNC | Mode select/synchronization input | Configures low-consumption (high), low-noise (low), or external sync (500–1400 kHz) |
| PGOOD | Open-drain power-good indicator | Pulled low when VOUT < 90% target; requires external pull-up to VOUT or VCC for sequencing |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous power stage | Eliminates need for external Schottky diode and reduces conduction losses by replacing it with low-Ron NMOS |
| 100% duty-cycle operation | Enables dropout-free regulation down to VIN ≈ VOUT - critical for end-of-discharge Li-ion operation |
| Selectable light-load modes | Low-consumption mode cuts IQ to 25 µA; low-noise mode maintains 600 kHz switching for EMI predictability |
| External frequency synchronization | Allows alignment with system clock or other switchers to avoid beat frequencies and simplify filtering |
| Comprehensive protection suite | Includes OVP (10% overref), short-circuit (peak/valley current limit), thermal shutdown (150 °C), and UVLO |
Applications
| Portable Medical Sensors | Industrial Handheld Terminals |
|---|---|
Use Scenario: Battery-powered glucose meter with LCD display and Bluetooth LE radio operating from single Li-ion cell. IC Role / Device Role / Timing Role: Primary power regulator supplying 1.8 V to MCU and 3.3 V to sensor interface and RF transceiver. Use Value: 95% efficiency and 25 µA quiescent current extend battery life beyond 7 days per charge; PGOOD enables safe MCU wake-up after power stabilization. | Use Scenario: Ruggedized barcode scanner used in warehouse logistics with intermittent high-current motor actuation. IC Role / Device Role / Timing Role: Main system regulator delivering 3.3 V to ARM Cortex-M4 MCU, image sensor, and motor driver logic. Use Value: 100% duty-cycle operation sustains 3.3 V output as battery drops to 3.4 V; short-circuit protection prevents latch-up during motor stall events. |
| GPS Navigation Devices | Digital Still Cameras (DSC) |
Use Scenario: Automotive-grade portable GPS unit with cold-start requirement and wide ambient temperature range. IC Role / Device Role / Timing Role: Core voltage regulator for GPS baseband processor and RF front-end, supporting fast turn-on from RUN pin. Use Value: ±1% output accuracy ensures consistent ADC reference and GNSS timing; thermal shutdown (150 °C) prevents failure during summer dashboard operation. | Use Scenario: Compact DSC with optical zoom motor, CMOS image sensor, and OLED viewfinder powered by 3.7 V Li-ion. IC Role / Device Role / Timing Role: Dual-output power management element generating 1.2 V for image processor and 2.8 V for sensor interface. Use Value: External synchronization (1.2 MHz) eliminates beat interference with image sensor pixel clock; low-noise mode ensures clean analog supply for low-noise image capture. |
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 | 3 MHz switching frequency, 400 mA output, no external sync, smaller 2 mm × 2 mm WSON package | Better suited for space-constrained ultra-portable devices where high-frequency operation reduces passive size | Choose if board area is critical and 400 mA output suffices; not suitable for 800 mA or external sync needs |
| MP2108DJ-LF-Z | 2.5 V–6 V input, 1 A output, 1.5 MHz fixed frequency, no PGOOD or sync, higher IQ (45 µA) | Targeted at cost-sensitive consumer electronics where full protection set is optional | Choose for higher output current and wider VIN, but accept missing PGOOD and sync functionality |
Compared with TPS62231DRYR and MP2108DJ-LF-Z, the L6926D1 uniquely balances 800 mA capability, 2–5.5 V input flexibility, external synchronization, and comprehensive protection - making it optimal for industrial and medical portable equipment requiring reliability and design margin.
Availability
L6926D1 is available at Aetrix Electronics and suitable for battery-powered instrumentation, handheld communication terminals, and portable medical diagnostics requiring stable component supply across extended product lifecycles.
Supply support for L6926D1 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in power management, microcontrollers, sensors, and automotive ICs.
The L6926D1 belongs to ST's high-efficiency DC-DC converter product line, engineered specifically for Li-ion–powered portable electronics demanding low quiescent current, wide input range, and robust protection in compact TSSOP8 packaging.
FAQ
What is the minimum input voltage required for L6926D1 startup?
The L6926D1 requires a minimum input voltage of 2.2 V (typical) to initiate startup due to its internal undervoltage lockout (UVLO) threshold. Once operational, it continues regulating down to 2.0 V input. This 2.2 V turn-on threshold ensures reliable initialization even as a single Li-ion cell discharges below 3.0 V, while the 100 mV hysteresis prevents oscillation near the threshold.
How does the L6926D1 achieve 100% duty cycle operation?
The L6926D1 achieves 100% duty cycle by disabling switching and holding the high-side MOSFET fully on when the output voltage approaches the input voltage. This bypass mode minimizes dropout voltage and conduction loss, enabling regulation even when VIN − VOUT falls below 100 mV - essential for sustaining 3.3 V output as a Li-ion cell discharges from 3.4 V to 3.0 V.
Can the PGOOD pin drive an MCU reset directly?
No - the PGOOD pin is an open-drain output requiring an external pull-up resistor to either VOUT or VCC. To drive an MCU reset, connect PGOOD through a pull-up (e.g., 10 kΩ) to VOUT and route the node to the MCU's active-low reset input. The 90% VOUT threshold ensures reset assertion occurs before supply collapse, providing deterministic power sequencing without additional logic.
What compensation network is recommended for stable operation?
A 220 pF capacitor from COMP to GND is the baseline compensation network validated for stability across most applications. For systems using ultra-low-ESR ceramic output capacitors, add a 47–68 kΩ resistor in series with the 220 pF capacitor to dampen high-frequency peaking and improve load-transient response - confirmed by observing minimal overshoot/undershoot during 100 mA–500 mA load steps.
L6926D1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-VDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 800mA
- Frequency - Switching:
- 600kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VFSON-EP (3x4.9)
L6926D1 FAQ
1.How can I place an order for L6926D1 through Aetrix?
Please submit a Request for Quotation (RFQ) for L6926D1 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 L6926D1 reliable?
The price and inventory of L6926D1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L6926D1 is usually 5 days.
3.What payment methods are accepted for L6926D1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L6926D1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L6926D1?
L6926D1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L6926D1 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 L6926D1?
For technical support, including L6926D1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L6926D1 requirements.
6.How does Aetrix verify that L6926D1 is sourced from the original manufacturer or authorized distributors?
All L6926D1 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 L6926D1 meets industry standards.
7.What is the process for return or replacement of L6926D1?
All L6926D1 units undergo pre-shipment inspection (PSI). If there is an issue with L6926D1, 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 L6926D1 part is unused and in its original packaging.
Return procedure for L6926D1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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