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STMicroelectronics E-L6925D
- Part No.:
- E-L6925D
- Manufacturer:
- STMicroelectronics
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
E-L6925D.pdf
- Description:
- IC REG BUCK ADJ 800MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,649
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Product details
Overview
L6925D from STMicroelectronics is a monolithic synchronous step-down DC-DC regulator designed for single Li-ion battery-powered systems. It operates from 2.7V to 5.5V input, delivers up to 800mA output current, supports adjustable output voltage down to 0.6V with ±1% accuracy, and achieves up to 95% efficiency in portable instrumentation and cellular handsets.
For engineers reviewing the L6925D datasheet, L6925D pinout, L6925D application, or L6925D equivalent, key selection criteria include its 600kHz fixed-frequency current-mode control, externally synchronizable clock (500–1400kHz), selectable low-noise/low-consumption mode, 100% duty-cycle capability for low-dropout operation, and integrated LBI/LBO battery monitoring functionality.
Technical Context
The L6925D implements a current-mode PWM controller with internal high-side (240mΩ) and low-side (215mΩ) MOSFETs, enabling synchronous rectification without external Schottky diodes. Its UVLO is set at 2.8V turn-on / 2.65V turn-off with 150mV hysteresis, optimized for single-cell Li-ion systems.
It features dual operating modes selected via the SYNC pin: low-noise mode (230µA quiescent current) and low-consumption mode (25µA), both supporting light-load efficiency optimization. The device includes hard overvoltage protection (10% above VOUT), short-circuit protection, thermal shutdown at 150°C, and open-drain LBO output triggered by LBI threshold detection at 0.6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports full discharge curve of single Li-ion cell (3.0–4.2V nominal, down to 2.7V cutoff) |
| Max Output Current | 800mA - sufficient for core logic rails in PDAs, GPS modules, and DSCs |
| Output Voltage Accuracy | ±1% - ensures stable power delivery to precision analog or RF circuitry |
| Switching Frequency | 600kHz fixed, synchronizable 500–1400kHz - enables EMI-controlled layout and small external LC filter size |
| Quiescent Current | 25µA (low-consumption mode) - extends battery life in standby/sleep states |
| Duty Cycle Range | 0–100% - allows dropout operation even at near-end-of-life battery voltage |
| Feedback Reference | 0.6V - sets minimum output voltage and defines resistor-divider scaling for adjustable VOUT |
Pinout & Package
Package: MSOP-8 (3mm × 3mm body, 0.65mm pitch), rated for −40°C to +150°C junction temperature, with 180°C/W junction-to-ambient thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - LBI | Battery low-input detector | Internal 0.6V threshold; external resistor divider enables custom battery undervoltage trip point |
| 2 - COMP | Error amplifier output | Requires 220pF compensation capacitor for loop stability in adjustable VOUT configurations |
| 3 - VFB | Feedback input | Compares against 0.6V reference; sets output voltage via external R-divider (VOUT = 0.6V × (1 + R1/R2)) |
| 4 - GND | Power and signal ground | Common return path for control circuitry, feedback network, and power stage |
| 5 - LX | Switch node | Connects to inductor; carries high di/dt switching current; requires tight layout and Kelvin grounding |
| 6 - VCC | Input power supply | Primary power input (2.7–5.5V); powers internal circuitry and high-side gate driver |
| 7 - SYNC | Mode select / sync input | Logic-high (≥1.3V) enables low-consumption mode; external clock input synchronizes switching frequency |
| 8 - LBO | Battery low-output | Open-drain output pulled low when LBI < 0.6V; requires external pull-up to monitored rail or VOUT |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous MOSFETs | Eliminates need for external Schottky diode, reducing BOM count and improving efficiency at light loads |
| Selectable operating mode | SYNC pin toggles between low-noise (230µA IQ) and low-consumption (25µA IQ) modes for dynamic power optimization |
| 100% duty-cycle capability | Enables regulation down to VOUT ≈ VIN − (IL × RDS(on)), critical for maintaining system operation near battery EOL |
| Integrated battery monitor | LBI/LBO pins provide programmable undervoltage warning with open-drain output compatible with microcontroller GPIO |
| Current-mode control architecture | Provides inherent cycle-by-cycle current limiting, fast transient response, and simplified loop compensation |
Applications
| Cellular Handsets | GPS Receivers |
|---|---|
Use Scenario: Powering baseband processor core voltage (1.2–1.8V) from single Li-ion battery under dynamic load conditions. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated core supply with fast load-step response and low-noise operation during RF transmission. Use Value: 95% peak efficiency and 25µA quiescent current in low-consumption mode extend talk time and standby duration. | Use Scenario: Generating clean 3.3V or 2.8V supply for GPS RF front-end and baseband ICs in handheld navigation devices. IC Role / Device Role / Timing Role: Synchronous buck converter synchronized to system clock to avoid beat frequencies interfering with GPS L1 band reception. Use Value: External synchronization (500–1400kHz) enables precise EMI placement away from sensitive GNSS bands. |
| Portable Medical Instruments | Digital Still Cameras (DSC) |
Use Scenario: Supplying stable 1.8V rail to ADCs and low-power microcontrollers in battery-operated glucose meters or pulse oximeters. IC Role / Device Role / Timing Role: High-accuracy (±1%) voltage regulator ensuring consistent analog measurement integrity across battery discharge cycle. Use Value: 0.6V feedback reference and tight output tolerance maintain sensor bias and reference stability over temperature and load. | Use Scenario: Powering image sensor interface and DSP core in compact digital cameras with rapid on/off cycling. IC Role / Device Role / Timing Role: Fast-starting buck regulator supporting burst-mode operation with minimal startup delay and controlled inrush. Use Value: 100% duty-cycle operation sustains output during battery voltage sag caused by flash capacitor charging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | 3MHz fixed-frequency, 600mA max output, 2.05V–6.5V input, 22µA IQ in PFM mode | Higher switching frequency enables smaller inductors but lower max current and no LBI/LBO monitoring | Preferred where board space is constrained and battery monitoring is handled externally |
| MAX8640YETA+ | 2.5V–5.5V input, 1A max output, 1.5MHz, 30µA IQ, no sync input or battery monitor pins | Higher current rating but lacks LBI/LBO and external synchronization capability | Chosen when higher load current is required and system-level battery monitoring is implemented separately |
Compared with TPS62231DRYR and MAX8640YETA+, the L6925D uniquely integrates battery voltage monitoring (LBI/LBO), external synchronization, and 100% duty-cycle operation-making it optimal for cost-sensitive, space-constrained Li-ion systems requiring autonomous low-battery signaling and EMI control.
Availability
L6925D is available at Aetrix Electronics and suitable for cellular handsets, GPS receivers, portable medical instruments, and digital still cameras requiring stable component supply across extended production lifecycles.
Supply support for L6925D 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 L6925D belongs to ST's high-efficiency DC-DC converter product line, engineered specifically for battery-powered portable electronics demanding ultra-low quiescent current, wide input range, and integrated system monitoring functions.
FAQ
What is the minimum output voltage achievable with the L6925D?
The L6925D has a fixed internal feedback reference voltage of 0.6V. With an external resistor divider connected to the VFB pin, the output voltage can be adjusted down to exactly 0.6V - no lower - because the feedback node must be held at this reference. Output voltages below 0.6V are not supported.
How does the SYNC pin function in low-consumption mode versus synchronization mode?
When SYNC is pulled high (≥1.3V), the device enters low-consumption mode with 25µA quiescent current and PFM-like behavior at light loads. When driven by an external clock signal (500–1400kHz), SYNC overrides internal oscillator timing, forcing fixed-frequency PWM operation to suppress beat frequencies in noise-sensitive applications.
Can the L6925D operate with input voltage below 2.7V?
No. The L6925D incorporates UVLO with a 2.8V turn-on threshold and 2.65V turn-off threshold. Input voltage below 2.7V disables regulation entirely - the device shuts down and LX floats. It is not functional below this range, and operation below 2.7V violates absolute maximum ratings for VCC.
Is an external compensation network required for stable operation?
Yes. The COMP pin requires a 220pF capacitor to ground for proper error amplifier compensation. This capacitor stabilizes the control loop when using the adjustable output configuration. Omitting it risks oscillation or poor transient response, especially with varying output capacitance or load conditions.
E-L6925D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- 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-MSOP
E-L6925D FAQ
1.How can I place an order for E-L6925D through Aetrix?
Please submit a Request for Quotation (RFQ) for E-L6925D 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 E-L6925D reliable?
The price and inventory of E-L6925D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for E-L6925D is usually 5 days.
3.What payment methods are accepted for E-L6925D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for E-L6925D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for E-L6925D?
E-L6925D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your E-L6925D 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 E-L6925D?
For technical support, including E-L6925D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your E-L6925D requirements.
6.How does Aetrix verify that E-L6925D is sourced from the original manufacturer or authorized distributors?
All E-L6925D 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 E-L6925D meets industry standards.
7.What is the process for return or replacement of E-L6925D?
All E-L6925D units undergo pre-shipment inspection (PSI). If there is an issue with E-L6925D, 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 E-L6925D part is unused and in its original packaging.
Return procedure for E-L6925D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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