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Analog Devices Inc. LTC3441EDE#PBF
- Part No.:
- LTC3441EDE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC3441EDE#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.2A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,757
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Product details
Overview
LTC3441EDE#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, synchronous buck-boost DC/DC converter IC designed for single-cell Li-ion and multi-cell battery-powered systems where input voltage may fall above, below, or equal to the regulated output. It delivers up to 1.2A continuous output current, operates from 2.4V–5.5V input and supports 2.4V–5.25V adjustable output, with 95% peak efficiency and 25µA quiescent current in Burst Mode. It is used in handheld instruments requiring stable 3.3V rail from a varying 2.5V–4.2V Li-ion source.
For engineers reviewing the LTC3441EDE#PBF datasheet, LTC3441EDE#PBF pinout, LTC3441EDE#PBF application, or LTC3441EDE#PBF equivalent, key selection criteria include its 1MHz fixed-frequency operation (synchronizable to 1.7MHz), true output disconnect in shutdown, 12-lead DFN (4mm × 3mm) thermal package, and support for seamless buck/boost/buck-boost mode transitions without output disruption.
Technical Context
The LTC3441EDE#PBF implements a proprietary four-switch buck-boost topology with internal N-channel (0.10Ω) and P-channel (0.11Ω) MOSFETs, enabling continuous conduction across all input-output relationships. Its voltage-mode PWM control uses an error amplifier (VC pin) to drive switch phasing based on internal control voltage (VCI), ensuring smooth transitions between buck, buck-boost, and boost regions without discontinuity.
Operation includes user-selectable Burst Mode (25µA IQ) or fixed-frequency switching (520–900µA active IQ), synchronized oscillator (1.15–1.7MHz), and integrated protections: thermal shutdown, reverse current limit (–0.8A), average current limit (3.2A), and soft-start via SHDN/SS pin clamping. The IC requires no external Schottky diodes for VOUT ≤ 4.3V but supports optional diodes for ~1–2% efficiency gain.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Synchronous 4-switch buck-boost - enables continuous regulation when VIN >, <, or = VOUT without mode-hopping artifacts. |
| Input Voltage Range | 2.4V to 5.5V - supports full discharge curve of single Li-ion (2.8V–4.2V) and partial multicell operation. |
| Output Voltage Range | 2.4V to 5.25V - set via resistor divider on FB pin; reference voltage is 1.22V ±30mV over temperature. |
| Max Continuous Output Current | 1.2A at VOUT = 3.3V - limited by internal MOSFET RDS(ON) and thermal design in 4mm × 3mm DFN. |
| Quiescent Current (Burst Mode) | 25µA typical - extends battery runtime in low-power standby states of portable instrumentation. |
| Switching Frequency | 1MHz fixed (±15%), synchronizable to 1.15–1.7MHz - balances EMI, inductor size, and efficiency. |
| Shutdown Current | <1µA - ensures true output disconnect and zero-load battery drain during system sleep. |
Pinout & Package
Package: 12-lead (4mm × 3mm) plastic DFN with exposed PGND pad (Pin 13), θJA = 43°C/W on 4-layer PCB, θJC = 4.3°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (SHDN/SS) | Combined shutdown and soft-start control | Voltage <0.4V disables IC; >1.4V enables; RC network here controls VC ramp rate for controlled output rise. |
| Pin 2 (GND) | Signal ground reference | Reference for FB, VC, and MODE/SYNC; must be separated from PGND to avoid noise coupling into feedback loop. |
| Pins 3, 6, 13 (PGND) | Power ground for NMOS switches | Exposed pad (Pin 13) must be soldered to PCB thermal plane; connects internal low-side N-channel FET sources. |
| Pin 4 (SW1) | Switch node A/B connection | Connects internal PMOS A and NMOS B; ties to one end of inductor; optional Schottky to GND improves light-load efficiency. |
| Pin 5 (SW2) | Switch node C/D connection | Connects internal NMOS C and PMOS D; ties to other inductor end; Schottky required to VOUT if VOUT >4.3V. |
| Pin 7 (MODE/SYNC) | Burst Mode enable / oscillator sync input | High = Burst Mode; low = fixed frequency; external clock (2.3–3.4MHz) synchronizes internal 1MHz oscillator. |
| Pin 8 (VOUT) | Regulated output terminal | Delivers final DC output; requires local ceramic bypass capacitor (e.g., 10µF) placed adjacent to pin. |
| Pin 9 (PVIN) | Power supply for internal gate drivers | Supplies high-current switching circuitry; requires dedicated 10µF ceramic cap to PGND for low-impedance path. |
| Pin 10 (VIN) | IC core supply input | Provides bias for internal logic, error amp, and comparators; separate from PVIN to isolate analog/digital noise. |
| Pin 11 (VC) | Error amplifier output | Drives switch duty cycle; compensation network (R/C) connected between VC and FB sets loop stability. |
| Pin 12 (FB) | Feedback voltage sensing input | Monitors resistor divider output; 1.22V reference enables precise output adjustment from 2.4V to 5.25V. |
Key Features
| Feature | Design Value |
|---|---|
| True output disconnect in shutdown | Internal switches fully isolate VOUT from input and inductor, eliminating reverse current and enabling zero-load battery drain. |
| Seamless buck-boost transition | No output glitch or regulation loss when VIN crosses VOUT; achieved via continuous 4-switch phasing controlled by VCI voltage. |
| Thermally enhanced DFN package | 4mm × 3mm footprint with exposed PGND pad delivers 43°C/W junction-to-ambient on 4-layer board, supporting 1.2A continuous load. |
| User-selectable operating mode | Single-pin (MODE/SYNC) control of Burst Mode (low-IQ) vs. fixed-frequency (low-noise) - no external logic required. |
| Integrated current limiting | Dual-level protection: 3.2A average current limit (FB clamping) and 4A peak switch limit (PMOS A disable) prevent inductor saturation and thermal runaway. |
Applications
| Handheld Instruments | Digital Cameras |
|---|---|
Use Scenario: Portable multimeter or spectrum analyzer powered by single Li-ion cell with dynamic load (backlight, ADC, display). IC Role / Device Role / Timing Role: Primary power regulator maintaining stable 3.3V rail while input drops from 4.2V to 2.8V during battery discharge. Use Value: Eliminates need for separate buck and boost converters; 95% efficiency preserves battery life; 25µA Burst Mode IQ extends idle time. |
Use Scenario: Image sensor and processor subsystem in compact digital camera requiring clean 3.3V supply under burst capture loads. IC Role / Device Role / Timing Role: Synchronous buck-boost converter delivering regulated output during flash charging (high current) and sensor readout (variable load). Use Value: Seamless mode transition prevents image corruption; 1MHz switching allows small 4.7µH inductor; low ESR output caps minimize ripple-induced noise in analog signal chain. |
| MP3 Players | Handheld Computers |
Use Scenario: Audio playback device with OLED display and SD card interface, powered by 3.7V Li-ion battery. IC Role / Device Role / Timing Role: Main DC/DC converter generating 3.3V for SoC, codec, and display driver from varying battery voltage. Use Value: 1.2A capability supports simultaneous audio decode and screen refresh; true shutdown disconnect prevents battery leakage during off-state. |
Use Scenario: Ruggedized industrial PDA running Linux OS, with Wi-Fi, touchscreen, and barcode scanner. IC Role / Device Role / Timing Role: High-current power stage supplying 3.3V to processor core and peripherals across wide input range (2.5V–5.5V). Use Value: Integrated 0.10Ω/0.11Ω MOSFETs reduce external component count; thermal DFN package sustains performance in sealed enclosures without forced airflow. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS63020DSJR | 3.5V–12V input, 1.2A max, 2.5MHz switching, integrated compensation, no external sync capability. | Higher input range suits 2S Li-ion or USB PD; lacks MODE/SYNC pin for Burst Mode control - uses automatic light-load mode. | Select when higher input voltage (>5.5V) or faster switching is needed; not drop-in due to different pinout and control logic. |
| MAX77827AEWA+T | 2.5V–5.5V input, 2A max, 2.2MHz, I²C programmable output, no Burst Mode, integrated LDOs. | Targeted at smartphone PMIC subsystems; offers digital configuration but higher IQ (40µA) and no true shutdown disconnect. | Choose for systems needing programmable voltage sequencing or multiple rails; unsuitable where ultra-low shutdown IQ (<1µA) is mandatory. |
Compared with TPS63020DSJR and MAX77827AEWA+T, the LTC3441EDE#PBF provides superior light-load efficiency via user-controllable Burst Mode, guaranteed true output disconnect, and deterministic 1MHz operation ideal for EMI-sensitive instrumentation - at the cost of lower maximum current and no digital interface.
Availability
LTC3441EDE#PBF is available at Aetrix Electronics and suitable for handheld instruments, digital cameras, MP3 players, and industrial handheld computers requiring stable component supply with long-term lifecycle support.
Supply support for LTC3441EDE#PBF 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
Analog Devices acquired Linear Technology in 2017 and maintains its precision analog and power management product lines with full datasheet, simulation model, and application support.
The LTC3441EDE#PBF belongs to Linear's high-efficiency micropower DC/DC converter family, engineered specifically for battery-powered portable equipment where input voltage varies across the output setpoint and minimal quiescent current is critical.
FAQ
What is the minimum input voltage required to start up the LTC3441EDE#PBF?
The LTC3441EDE#PBF has a guaranteed minimum start-up voltage of 2.4V, with typical operation beginning at 2.3V. This allows reliable turn-on across the full discharge curve of a single Li-ion cell (2.8V–4.2V). Below 2.4V, the UVLO circuit prevents erratic behavior, and the IC remains disabled until VIN rises above threshold. Startup is confirmed by VOUT regulation and absence of PGND pulsing.
Can the LTC3441EDE#PBF operate with an output voltage lower than 2.4V?
Yes, the LTC3441EDE#PBF can regulate outputs down to 0.4V using the FB divider, but it is only specified for 2.4V minimum without external Schottky diodes. For VOUT < 2.4V, a Schottky diode from SW2 to VOUT is required because synchronous switch D's RDS(ON) increases significantly at low VOUT, risking conduction failure. The datasheet confirms this requirement in the "Output Voltage < 2.4V" section.
How does the MODE/SYNC pin control Burst Mode versus fixed-frequency operation in the LTC3441EDE#PBF?
In the LTC3441EDE#PBF, driving MODE/SYNC >1.4V enables Burst Mode (25µA IQ); pulling it <0.4V forces fixed-frequency operation (520–900µA IQ); applying a 2.3–3.4MHz external clock synchronizes the internal oscillator to half that frequency. The pin is not level-sensitive for sync - pulse width must be 100ns–2µs, and the IC automatically disables Burst Mode during sync.
What thermal considerations apply to the LTC3441EDE#PBF in its 12-lead DFN package?
The LTC3441EDE#PBF's 4mm × 3mm DFN package relies on the exposed PGND pad (Pin 13) for thermal conduction. To achieve θJA = 43°C/W, the pad must be soldered to ≥1 in² of 2-oz copper on a 4-layer PCB with ≥6 thermal vias. Without proper thermal land, junction temperature can exceed 125°C at 1.2A load, triggering thermal shutdown. Layout guidelines emphasize short, wide traces to SW1/SW2 and separation of PGND/GND planes.
Does the LTC3441EDE#PBF require external Schottky diodes for standard 3.3V output operation?
No, the LTC3441EDE#PBF does not require external Schottky diodes for VOUT = 3.3V operation, as 3.3V < 4.3V. Internal synchronous MOSFETs provide full rectification. Optional diodes (e.g., MBRM120LT3) across SW1–GND and SW2–VOUT improve peak efficiency by ~1–2% at light loads but add cost and board area. Diodes become mandatory only when VOUT > 4.3V or VIN > 4.5V under fault conditions.
LTC3441EDE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.4V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.4V
- Voltage - Output (Max):
- 5.25V
- Current - Output:
- 1.2A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (4x3)
LTC3441EDE#PBF FAQ
1.How can I place an order for LTC3441EDE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3441EDE#PBF 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 LTC3441EDE#PBF reliable?
The price and inventory of LTC3441EDE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3441EDE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3441EDE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3441EDE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3441EDE#PBF?
LTC3441EDE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3441EDE#PBF 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 LTC3441EDE#PBF?
For technical support, including LTC3441EDE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3441EDE#PBF requirements.
6.How does Aetrix verify that LTC3441EDE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3441EDE#PBF 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 LTC3441EDE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3441EDE#PBF?
All LTC3441EDE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3441EDE#PBF, 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 LTC3441EDE#PBF part is unused and in its original packaging.
Return procedure for LTC3441EDE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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