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Analog Devices Inc. LTC3441EDE#TRPBF
- Part No.:
- LTC3441EDE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC3441EDE#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.2A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:7,176
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Product details
Overview
LTC3441EDE#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, fixed-frequency synchronous buck-boost DC/DC converter IC designed for single-cell Li-ion 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 portable instrumentation requiring seamless voltage regulation across battery discharge.
For engineers reviewing the LTC3441EDE#TRPBF datasheet, LTC3441EDE#TRPBF pinout, LTC3441EDE#TRPBF application, or LTC3441EDE#TRPBF equivalent, key selection criteria include its 1MHz internal oscillator (synchronizable to 1.7MHz), true output disconnect in shutdown (<1µA IQ), thermally enhanced 12-lead DFN (4mm × 3mm), and integrated 0.10Ω NMOS / 0.11Ω PMOS power switches enabling single-inductor operation without mandatory Schottky diodes.
Technical Context
The LTC3441EDE#TRPBF implements a proprietary four-switch buck-boost topology with continuous transfer function across all operating regions-buck (VIN > VOUT), buck-boost (VIN ≈ VOUT), and boost (VIN < VOUT)-ensuring smooth mode transitions without output disturbance. Its voltage-mode PWM control uses an error amplifier (VC pin) to drive gate drivers with anti-cross-conduction logic and 5µs delay for safe switching.
It integrates UVLO (2.4V start-up), thermal shutdown, reverse current limiting (–800mA typical), average current limit (3.2A typical), and selectable Burst Mode (25µA IQ) or fixed-frequency (1MHz ±15%) operation via the MODE/SYNC pin. The SHDN/SS pin combines soft-start ramping and shutdown control with clamping of the VC node.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Synchronous 4-switch buck-boost - enables seamless regulation when VIN crosses VOUT without discontinuity or mode-hopping artifacts. |
| Input Voltage Range | 2.4V to 5.5V - supports full discharge curve of single Li-ion (2.8V–4.2V) plus margin for system headroom. |
| Output Voltage Range | 2.4V to 5.25V - set via external resistor divider on FB pin; reference voltage = 1.22V ±30mV over temperature. |
| Max Continuous Output Current | 1.2A - achievable from single Li-ion at VOUT = 3.3V; limited by thermal performance in 4mm × 3mm DFN package. |
| Quiescent Current (Burst Mode) | 25µA - extends battery runtime in low-power standby states while maintaining regulation. |
| Switch RDS(ON) | NMOS: 0.10Ω, PMOS: 0.11Ω - minimizes conduction loss; enables >95% peak efficiency at 1A load. |
| Operating Frequency | 1MHz (±15%), synchronizable to 1.15–1.7MHz - balances EMI, inductor size, and efficiency for portable designs. |
| Shutdown Current | <1µA - ensures true output disconnect and zero-load battery drain during system sleep. |
Pinout & Package
The LTC3441EDE#TRPBF is housed in a thermally enhanced 12-lead (4mm × 3mm) plastic DFN package with exposed PGND pad (Pin 13) soldered to PCB for optimal thermal dissipation (θJA = 43°C/W on 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN/SS (1) | 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. |
| GND (2) | Signal ground reference | Reference for error amp, feedback, and internal logic; must be separated from PGND to avoid noise coupling. |
| PGND (3,6,13) | Power ground for NMOS switches | Low-impedance return path for high di/dt switch currents; exposed pad (Pin 13) must be soldered for thermal and electrical integrity. |
| SW1 (4) | Node connecting internal switches A and B | Connects to one end of inductor; optional Schottky diode to GND improves light-load efficiency in buck region. |
| SW2 (5) | Node connecting internal switches C and D | Connects to other end of inductor; Schottky diode to VOUT required if VOUT >4.3V to prevent reverse conduction. |
| MODE/SYNC (7) | Burst Mode enable / oscillator sync input | High = Burst Mode (25µA IQ); low = fixed-frequency; external clock (2.3–3.4MHz) synchronizes internal 1MHz oscillator. |
| VOUT (8) | Regulated output voltage node | Delivers final regulated output; requires ceramic bypass capacitor placed adjacent to VOUT and GND pins. |
| PVIN (9) | Power supply for internal NMOS drivers | Must be decoupled with ≥10µF ceramic cap to PGND; supplies gate drive for low-side NMOS switches. |
| VIN (10) | IC core supply and VCC source | Provides bias for internal circuitry; requires ≥4.7µF low-ESR capacitor to GND for stable operation. |
| VC (11) | Error amplifier output | Loop compensation network connects here to FB; determines duty cycle and regulates output via voltage-mode control. |
| FB (12) | Feedback input for output voltage sensing | Resistor divider from VOUT sets output; internal 1.22V reference enables precise adjustment from 2.4V to 5.25V. |
Key Features
| Feature | Design Value |
|---|---|
| Single-inductor buck-boost architecture | Eliminates need for separate buck/boost converters or complex power sequencing in battery-powered systems. |
| True output disconnect in shutdown | Prevents battery drain through load or feedback resistors; critical for long-term storage in handheld devices. |
| Integrated 0.10Ω NMOS / 0.11Ω PMOS switches | Reduces external component count and PCB area; avoids discrete MOSFET selection and layout complexity. |
| 125°C junction temperature protection | Thermal shutdown prevents damage during overload or poor heatsinking; allows safe operation in compact enclosures. |
| Selectably optimized light-load efficiency | Burst Mode (25µA IQ) vs. fixed-frequency trade-off lets designers prioritize runtime or EMI/noise per application phase. |
| Internal 1MHz oscillator with sync capability | Enables deterministic EMI placement and multi-rail synchronization without external timing components. |
Applications
| Handheld Instruments | Digital Cameras |
|---|---|
Use Scenario: Portable multimeter or oscilloscope powered by single Li-ion battery with varying voltage (2.8V–4.2V) while requiring stable 3.3V for MCU and analog front-end. IC Role / Device Role / Timing Role: Primary voltage regulator providing continuous, ripple-controlled 3.3V rail regardless of battery state-of-charge. Use Value: Eliminates need for dual-stage conversion (buck + LDO) and maintains accuracy of ADC references and sensor interfaces across full battery range. |
Use Scenario: DSLR or mirrorless camera with image sensor, ISP, and flash driver demanding 3.3V and 5V rails from same Li-ion source. IC Role / Device Role / Timing Role: Buck-boost converter generating 3.3V main logic rail; optionally reconfigured for 5V flash charging path. Use Value: Enables single-battery design with no voltage gap issues during video capture or burst shooting when battery sags below 3.3V. |
| MP3 Players | Handheld Computers |
Use Scenario: Audio playback device using Li-ion battery and requiring ultra-low-noise 3.3V supply for DAC, codec, and RF section. IC Role / Device Role / Timing Role: High-efficiency power stage with selectable Burst Mode for playback and fixed-frequency for low-EMI audio processing. Use Value: Extends playtime via 25µA quiescent current in pause mode while preserving SNR during active decoding. |
Use Scenario: Ruggedized tablet or industrial PDA operating from removable Li-ion pack with wide ambient temperature range (–40°C to 85°C). IC Role / Device Role / Timing Role: Main system power regulator delivering 3.3V to SoC, memory, and display interface under dynamic load transients. Use Value: Maintains regulation during CPU load spikes (e.g., 100mA → 1A step) with minimal VOUT droop due to fast error amp response and robust current limiting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS63020DSJR | 3.5V–12V input; lower max output current (1A); 2.5MHz switching; no Burst Mode, only PFM/PWM hybrid. | Better suited for higher-input systems (e.g., 2-cell LiPo); lacks true output disconnect in shutdown. | Select if input exceeds 5.5V or higher frequency is needed; verify shutdown leakage meets system requirements. |
| MAX77827AEWJ+T | 2.5V–5.5V input; 2A output; I2C programmable; integrated load switch; 3.25MHz operation. | Requires digital configuration; larger 20-pin WLP package; higher BOM cost but adds system-level flexibility. | Choose when programmability, higher current, or integrated load control justifies added complexity and footprint. |
Compared with TPS63020DSJR and MAX77827AEWJ+T, the LTC3441EDE#TRPBF offers superior light-load efficiency via dedicated Burst Mode, guaranteed true output disconnect, and simpler analog feedback design-making it optimal for cost-sensitive, battery-life-critical portable instruments where digital control is unnecessary.
Availability
LTC3441EDE#TRPBF is available at Aetrix Electronics and suitable for handheld instruments, digital cameras, and MP3 players requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.
Supply support for LTC3441EDE#TRPBF 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 full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC3441 belongs to Linear's high-efficiency micropower DC/DC converter family, engineered specifically for battery-powered portable electronics needing seamless input-to-output voltage crossover without efficiency cliffs or mode transitions.
FAQ
What is the minimum input voltage required to start up the LTC3441EDE#TRPBF?
The LTC3441EDE#TRPBF has a guaranteed start-up voltage of 2.4V (typical 2.3V), enabling reliable operation across the full discharge curve of a single Li-ion cell. Below this threshold, UVLO prevents erratic behavior or incomplete regulation. Startup is confirmed once internal bias rails stabilize and the error amplifier begins controlling the VC pin.
Does the LTC3441EDE#TRPBF require external Schottky diodes for basic operation?
No-external Schottky diodes are optional for the LTC3441EDE#TRPBF. They improve peak efficiency by ~1–2% in light-load conditions but are not required for functionality. A Schottky diode from SW2 to VOUT is mandatory only when VOUT exceeds 4.3V to prevent reverse current through internal PMOS switch D.
How does Burst Mode operation affect output voltage ripple on the LTC3441EDE#TRPBF?
In Burst Mode, the LTC3441EDE#TRPBF delivers energy in discrete packets, causing variable-frequency ripple whose amplitude and period depend on load current. At 1mA load, ripple may reach 20–30mVPP; at 100µA, it increases further. This is inherent to discontinuous conduction and differs from fixed-frequency's predictable 1MHz sawtooth ripple.
Can the LTC3441EDE#TRPBF regulate output voltages below 2.4V?
Yes-the LTC3441EDE#TRPBF can regulate down to 0.4V, but operation below 2.4V requires an external Schottky diode from SW2 to VOUT. This bypasses the internal PMOS switch D, whose RDS(ON) rises significantly at low VOUT, ensuring efficient conduction and preventing regulation loss.
What thermal derating applies to the LTC3441EDE#TRPBF in its 4mm × 3mm DFN package?
With proper PCB layout-including soldered exposed PGND pad and ≥2 oz copper on inner layers-the LTC3441EDE#TRPBF sustains 1.2A continuous output at 85°C ambient. Above 65°C, output current should be linearly reduced to maintain TJ ≤ 125°C; at 85°C ambient, maximum sustainable load is ~900mA with 4-layer board cooling.
LTC3441EDE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC3441EDE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3441EDE#TRPBF 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#TRPBF reliable?
The price and inventory of LTC3441EDE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3441EDE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3441EDE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3441EDE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3441EDE#TRPBF?
LTC3441EDE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3441EDE#TRPBF 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#TRPBF?
For technical support, including LTC3441EDE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3441EDE#TRPBF requirements.
6.How does Aetrix verify that LTC3441EDE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3441EDE#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3441EDE#TRPBF?
All LTC3441EDE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3441EDE#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3441EDE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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