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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

STMicroelectronics L6920DBTR

Name: L6920DBTR
Brand: STMicroelectronics
SKU: L6920DBTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L6920DBTR

Manufacturer:: STMicroelectronics

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Datasheet:: L6920DBTR.pdf

Description:: IC REG BST ADJ/1.8V 800MA 8MSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

L6920DBTR from STMicroelectronics is a monolithic synchronous rectifier step-up DC/DC converter IC designed for low-voltage battery-powered systems. It starts up from 0.8V input, delivers adjustable output (1.8–5.5V) or fixed 3.3V/5V, integrates 750mA current limiting and 1.23V reference, and operates in MSOP8 package-enabling compact PDA, digital camera, and GPS power rails.

For engineers reviewing the L6920DBTR datasheet, L6920DBTR pinout, L6920DBTR application, or L6920DBTR equivalent, key selection criteria include startup voltage margin, synchronous switch R_DS(on) (300 mΩ), low-battery detection threshold configurability via LBI/LBO, and shutdown quiescent current (<1 µA).

Technical Context

The L6920DBTR uses peak-current-mode control with fixed maximum on-time (5 µs) and minimum off-time (1 µs), enabling PFM operation at light loads and PWM-like behavior under heavy load. Its internal N-channel main switch and synchronous P-channel rectifier eliminate external diode requirements.

Low-battery detection is implemented via an open-drain LBO output referenced to the 1.23V internal bandgap, requiring an external resistor divider on LBI to set the trip point. Reverse polarity protection blocks destructive current flow when battery is inserted backward, with <1 µA reverse leakage.

Key Specifications

Parameter	Value and Actual Design Meaning
Start-up Voltage	0.8V min - enables operation from single NiMH or deeply discharged Li-ion cell
Output Voltage Range	1.8V to 5.5V - supports modern ASICs and µPs requiring ≥1.8V core supply
Switch Current Limit	750mA typ - defines max deliverable load current before regulation loss
Reference Voltage	1.23V ±4% - used for feedback and low-battery comparator; stable over temp
Quiescent Current	12 µA typ at 3.3V out - extends battery life in standby or low-power modes
Shutdown Current	0.1 µA typ - reduces system drain during host-initiated power-off
Switching Frequency	Up to 1 MHz - permits use of small 10 µH inductors and 47 µF ceramic output caps

Pinout & Package

Package: MSOP8 (3.0 × 4.9 mm, 0.65 mm pitch), RoHS-compliant ECOPACK® with lead-free interconnect.

Pin/Terminal	Circuit Role	Design Meaning
1 FB	Feedback voltage selector	Connect to GND for 5V, OUT for 3.3V, or resistor divider for adjustable V_OUT
2 LBI	Low-battery detector input	Accepts resistor-divided battery voltage; triggers at 1.23V internal threshold
3 LBO	Low-battery open-drain output	Sinks current when battery drops below threshold; requires external ~200 kΩ pull-up
4 REF	1.23V reference output	Bypassed with 100 nF capacitor to GND for noise filtering; no stability impact
5 SHDN	Enable/shutdown control	Active-high logic: >0.6V = ON, <0.2V = shutdown (I_SHDN < 0.1 µA)
6 GND	Power and signal ground	Common return for all internal circuits and external components
7 LX	Inductor switch node	Connects to one end of boost inductor; carries high dI/dt switching current
8 OUT	Regulated power output	Delivers final boosted voltage; feeds load and FB network; bypassed with 47 µF cap

Key Features

Feature	Design Value
Synchronous rectification	Integrated P-channel MOSFET replaces external Schottky diode, reducing conduction loss and board area
Ultra-low start-up voltage	0.8V enables use with single-cell alkaline/NiMH batteries down to end-of-life voltage
Configurable low-battery detection	LBI/LBO interface allows precise battery depletion warning without external comparator
Reverse polarity protection	Internal circuit blocks reverse current flow; prevents damage and battery drain during misinsertion
Fixed + adjustable output options	Three configurations: 3.3V (FB→OUT), 5V (FB→GND), or 1.8–5.5V (external divider) - no rework needed

Applications

PDA Power Management

Digital Camera Core Supply

Use Scenario: Powering ARM-based processor, display driver, and memory in handheld PDAs using 1–3 alkaline or NiMH cells.

IC Role / Device Role / Timing Role: Primary step-up regulator delivering regulated 3.3V from declining battery voltage (1.0–2.4V).

Use Value: 0.8V start-up ensures full runtime from fresh to exhausted cells; 12 µA quiescent current minimizes standby drain.

Use Scenario: Supplying image sensor, ISP, and flash controller in compact digital cameras powered by single Li-ion cell.

IC Role / Device Role / Timing Role: Boost converter generating stable 5V rail from 3.0–4.2V battery input.

Use Value: Synchronous rectification achieves >90% efficiency at 200 mA load, reducing thermal stress in sealed enclosure.

GPS Receiver Module

Cellular Phone Subsystem

Use Scenario: Providing clean 3.3V supply to GPS RF front-end and baseband IC in portable navigation devices.

IC Role / Device Role / Timing Role: Low-noise, high-PFM-efficiency boost stage operating across wide input range (1.5–3.6V).

Use Value: 1 MHz switching frequency allows miniature 10 µH inductor and avoids AM radio band interference.

Use Scenario: Powering Bluetooth/Wi-Fi coexistence module or audio codec in feature phones with dual-cell NiCd/NiMH battery.

IC Role / Device Role / Timing Role: Secondary regulated rail generator isolated from main PMIC, supporting dynamic voltage scaling.

Use Value: Adjustable output (via FB divider) enables precise 2.85V or 3.0V setting matching peripheral IC requirements.

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-up converter applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS61200DRCT	Higher 0.3V start-up (vs. 0.8V); 1.2A switch limit; integrated soft-start	Lacks dedicated LBO output; requires external circuit for low-battery signaling	Preferred when higher output current or soft-start is critical; unsuitable for sub-1V battery start-up
MAX1706EUT+T	Fixed 3.3V only; 0.9V start-up; no LBI/LBO pins; 600mA current limit	No battery monitoring capability; smaller solution size but less flexible	Chosen for cost-sensitive, fixed-output designs where battery state awareness is unnecessary

Compared with TPS61200DRCT and MAX1706EUT+T, the L6920DBTR uniquely combines ultra-low 0.8V start-up, integrated low-battery signaling (LBI/LBO), and synchronous rectification in MSOP8-making it optimal for space-constrained, multi-cell battery systems requiring runtime visibility and minimal BOM count.

Availability

L6920DBTR is available at Aetrix Electronics and suitable for PDA power management, digital camera core supply, and GPS receiver modules requiring stable component supply across extended temperature and lifecycle phases.

Supply support for L6920DBTR 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, designing and manufacturing analog, MCU, power, and sensing solutions for industrial, automotive, and consumer markets.

The L6920DBTR belongs to ST's low-voltage DC-DC converter product line, engineered specifically for energy-constrained portable electronics requiring high efficiency, minimal external components, and robust battery interface features.

FAQ

What is the minimum input voltage required for L6920DBTR to start switching?

The L6920DBTR initiates regulation at 0.8V input (typical) with 3.3V output, verified per datasheet Figure 4 and Table 4. This is achieved via internal charge pump biasing of the N-channel switch gate, allowing operation from a single depleted alkaline or NiMH cell. Startup completes once output reaches ~1.4V.

How is the low-battery detection threshold configured on L6920DBTR?

The L6920DBTR uses its LBI pin to accept a resistor divider from battery voltage; the internal comparator trips when LBI falls below 1.23V. For example, a 1.8V battery cutoff requires R1/R2 = 0.467 (e.g., 467 kΩ/1 MΩ). The open-drain LBO pin then pulls low, requiring a 200 kΩ pull-up to system rail for logic-level signaling.

Can L6920DBTR be used with lithium-ion batteries?

Yes - the L6920DBTR supports input voltages up to 5.5V, covering the full Li-ion range (2.7–4.2V per cell). Its reverse polarity protection safeguards against accidental inverted insertion, and the 750mA current limit prevents inductor saturation during high-current bursts typical in Li-ion-powered cameras or GPS units.

What external components are mandatory for basic L6920DBTR operation?

Only three components are required: a 10 µH power inductor between VIN and LX, a 47 µF output capacitor from OUT to GND, and a 10 µF input capacitor from VIN to GND. No external diode is needed due to integrated synchronous rectification. Optional parts include FB divider resistors and LBI divider for battery monitoring.

L6920DBTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Function:: Step-Up

Output Configuration:: Positive

Topology:: Boost

Output Type:: Adjustable (Fixed)

Number of Outputs:: 1

Voltage - Input (Min):: 0.6V

Voltage - Input (Max):: 5.5V

Voltage - Output (Min/Fixed):: 1.8V (3.3V, 5V)

Voltage - Output (Max):: 5.5V

Current - Output:: 800mA (Switch)

Frequency - Switching:: -

Synchronous Rectifier:: Yes

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-MSOP

L6920DBTR FAQ

1.How can I place an order for L6920DBTR through Aetrix?

Please submit a Request for Quotation (RFQ) for L6920DBTR 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 L6920DBTR reliable?

The price and inventory of L6920DBTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L6920DBTR is usually 5 days.

3.What payment methods are accepted for L6920DBTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L6920DBTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L6920DBTR?

L6920DBTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L6920DBTR 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 L6920DBTR?

For technical support, including L6920DBTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L6920DBTR requirements.

6.How does Aetrix verify that L6920DBTR is sourced from the original manufacturer or authorized distributors?

All L6920DBTR 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 L6920DBTR meets industry standards.

7.What is the process for return or replacement of L6920DBTR?

All L6920DBTR units undergo pre-shipment inspection (PSI). If there is an issue with L6920DBTR, 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 L6920DBTR part is unused and in its original packaging.

Return procedure for L6920DBTR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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