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STMicroelectronics L6925D
- Part No.:
- L6925D
- Manufacturer:
- STMicroelectronics
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
L6925D.pdf
- Description:
- IC REG BUCK ADJ 800MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,134
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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 down to 0.6V with ±1% accuracy, and achieves up to 95% efficiency in low-noise/low-consumption mode-used in cellular phones and handheld terminals.
For engineers reviewing the L6925D datasheet, L6925D pinout, L6925D application, or L6925D equivalent, key selection criteria include its 600kHz fixed-frequency current-mode control, external synchronization capability (500–1400kHz), 100% duty-cycle low-dropout operation, integrated high- and low-side MOSFETs, and dual-mode light-load optimization.
Technical Context
The L6925D implements a current-mode PWM controller with internal synchronous rectification, eliminating need for an external Schottky diode. Its 600kHz switching frequency is fixed but externally synchronizable across 500–1400kHz, enabling EMI reduction in noise-sensitive portable designs.
It integrates UVLO (2.7V turn-on, 2.65V turn-off), overvoltage protection (10% above VOUT), short-circuit protection, thermal shutdown at 150°C, and a dedicated low-battery detection circuit (LBI/LBO) with 0.6V threshold and open-drain output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports single Li-ion cell operation with UVLO hysteresis of 150mV |
| Output Current | 800mA max - sufficient for baseband processors and RF ICs in mobile handsets |
| Output Voltage Accuracy | ±1% - ensures stable core voltage for sensitive digital loads like ARM-based PDAs |
| Switching Frequency | 600kHz fixed, syncable 500–1400kHz - enables precise EMI filtering and layout optimization |
| Quiescent Current | 25µA (low-consumption mode) - extends battery life during standby in GPS receivers |
| Duty Cycle Range | 0–100% - allows dropout as low as VOUT − (IL × RDS(on)) under light load |
| Feedback Reference | 0.6V - sets minimum output voltage and defines resistor divider ratio for VOUT scaling |
Pinout & Package
Package: MSOP8 (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 detector input | Accepts external resistor divider to set custom low-battery threshold; internal reference = 0.6V |
| 2 COMP | Error amplifier output | Requires 220pF capacitor to ground for loop compensation and stability |
| 3 VFB | Feedback input | Compares output voltage (via resistor divider) against 0.6V reference to regulate VOUT |
| 4 GND | Power and signal ground | Common return path for LX switching current and analog feedback circuitry |
| 5 LX | Switch node | Connects to inductor; carries high di/dt pulsed current; requires tight layout and low-inductance routing |
| 6 VCC | Input power supply | Primary power input (2.7–5.5V); powers internal logic, gate drivers, and bias circuits |
| 7 SYNC | Mode select / sync input | Low = low-noise mode; high = low-consumption mode; also accepts external clock (500–1400kHz) |
| 8 LBO | Low-battery open-drain output | Asserts low when LBI < 0.6V; requires external pull-up to regulated output or system rail |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous MOSFETs | Eliminates external Schottky diode, reducing BOM count and PCB area in space-constrained handhelds |
| 100% duty-cycle operation | Enables regulation down to VOUT ≈ VIN − IL × (RDS(on)_HS + RDS(on)_LS), critical for Li-ion end-of-discharge |
| Selectable light-load modes | Switches between low-noise PWM and low-consumption PFM-like behavior based on SYNC pin voltage |
| Programmable low-battery detection | LBI/LBO pair provides system-level battery monitoring without external comparators or ADC resources |
| Current-mode control architecture | Provides inherent cycle-by-cycle current limiting and fast transient response to load steps in DSC or GPS modules |
Applications
| Cellular Phones | PDAs and Handheld Terminals |
|---|---|
Use Scenario: Powering baseband processor core voltage (e.g., 1.8V) from a single Li-ion cell (3.0–4.2V). IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated core supply with dynamic load response. Use Value: 95% peak efficiency and 25µA quiescent current extend talk time and standby duration. | Use Scenario: Generating multiple rail voltages (e.g., 1.2V CPU, 3.3V I/O) using cascaded regulators. IC Role / Device Role / Timing Role: Intermediate buck stage stepping down battery voltage before secondary LDOs or point-of-load converters. Use Value: Adjustable 0.6V reference and ±1% accuracy enable precise voltage setting for ARM9/ARM11 SoCs. |
| Digital Still Cameras (DSC) | GPS Receivers |
Use Scenario: Supplying image sensor analog front-end and DSP core from shared battery rail. IC Role / Device Role / Timing Role: High-efficiency, low-noise power source synchronized to avoid interference with CCD/CMOS timing signals. Use Value: External synchronization (500–1400kHz) allows alignment with system clock to suppress beat frequencies in image capture. | Use Scenario: Providing clean 3.3V supply to GPS baseband IC while operating in cold-start or weak-signal conditions. IC Role / Device Role / Timing Role: Battery-aware regulator with LBI/LBO interface feeding host MCU's battery monitoring logic. Use Value: Programmable low-battery threshold (0.6V reference + external divider) enables accurate remaining capacity estimation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRVR | 3MHz fixed-frequency, 600mA max, 2.05V–6.5V input, 0.6V reference, no LBI/LBO | Lacks battery monitoring pins; optimized for ultra-small footprint, not low-battery signaling | Prefer when board space is constrained and battery telemetry is handled elsewhere |
| MAX8640YETA+ | 2.5–5.5V input, 1A max, 0.6V reference, 2.25MHz, no sync input or LBI/LBO | Higher switching frequency reduces inductor size but increases EMI sensitivity; no low-battery interface | Choose when higher output current and smaller magnetics outweigh need for battery status signaling |
Compared with TPS62231DRVR and MAX8640YETA+, the L6925D uniquely combines Li-ion-optimized UVLO, integrated LBI/LBO battery monitoring, and external synchronization-making it optimal for cost-sensitive, battery-aware portable systems where EMI control and runtime telemetry are jointly required.
Availability
L6925D is available at Aetrix Electronics and suitable for cellular phones, PDAs and handheld terminals, digital still cameras, and GPS receivers requiring stable component supply across long-lifecycle consumer electronics programs.
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, designing and manufacturing analog, microcontroller, power, and sensor solutions for automotive, industrial, and consumer markets.
The L6925D belongs to ST's high-efficiency DC-DC converter product line, engineered specifically for battery-powered portable equipment demanding low quiescent current, wide input range, and integrated system monitoring features.
FAQ
What is the function of the SYNC pin on the L6925D?
The SYNC pin serves dual functions: applying VCC selects low-consumption mode (PFM-like), applying GND selects low-noise PWM mode, and applying an external clock (500–1400kHz) synchronizes switching to reduce EMI. It does not require pull-up/down resistors and directly interfaces with system clocks or GPIOs.
How is the low-battery detection threshold set on the L6925D?
The LBI pin has an internal 0.6V reference; threshold is set by an external resistor divider between VCC and GND, with LBI connected to the midpoint. When voltage at LBI falls below 0.6V, the open-drain LBO pin pulls low, requiring an external pull-up resistor to a valid logic rail.
Can the L6925D operate with 100% duty cycle, and under what conditions?
Yes-the L6925D supports 100% duty cycle to maintain regulation when input voltage approaches output voltage. This occurs automatically during light loads or near end-of-battery discharge (e.g., VIN = 3.2V → VOUT = 3.0V), enabled by its synchronous architecture and absence of diode drop.
What is the recommended compensation network for the COMP pin?
A 220pF capacitor from COMP to GND is specified for stability across all operating conditions. No series resistor is required. Layout must minimize trace length and parasitic inductance, as COMP is sensitive to noise; placement should be adjacent to the error amplifier and away from LX switching node.
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
L6925D FAQ
1.How can I place an order for L6925D through Aetrix?
Please submit a Request for Quotation (RFQ) for 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 L6925D reliable?
The price and inventory of L6925D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L6925D is usually 5 days.
3.What payment methods are accepted for L6925D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L6925D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L6925D?
L6925D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 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 L6925D?
For technical support, including L6925D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L6925D requirements.
6.How does Aetrix verify that L6925D is sourced from the original manufacturer or authorized distributors?
All 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 L6925D meets industry standards.
7.What is the process for return or replacement of L6925D?
All L6925D units undergo pre-shipment inspection (PSI). If there is an issue with 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 L6925D part is unused and in its original packaging.
Return procedure for L6925D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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