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Analog Devices Inc. LTC3440EDD#TRPBF
- Part No.:
- LTC3440EDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3440EDD#TRPBF.pdf
- Description:
- IC REG BUCK BST ADJ 600MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,350
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Product details
Overview
LTC3440EDD#TRPBF from Analog Devices (formerly Linear Technology) is a micropower synchronous buck-boost DC/DC converter designed for single-cell Li-ion, multi-cell alkaline, or NiMH battery systems where input voltage may be above, below, or equal to the regulated output. It delivers up to 600mA continuous output current, operates from 2.5V to 5.5V input and output ranges, and achieves up to 96% efficiency with synchronous rectification and Burst Mode® operation at 25µA quiescent current.
For engineers reviewing the LTC3440EDD#TRPBF datasheet, LTC3440EDD#TRPBF pinout, LTC3440EDD#TRPBF application, or LTC3440EDD#TRPBF equivalent, key selection considerations include its fixed-frequency programmable oscillator (300kHz–2MHz), 10-pin 3mm × 3mm DFN package with exposed thermal pad, user-controllable Burst Mode enable via MODE/SYNC pin, and integrated 0.19Ω NMOS / 0.22Ω PMOS switches eliminating external Schottky diodes for VOUT < 4.3V.
Technical Context
The LTC3440EDD#TRPBF implements a proprietary four-switch buck-boost topology with continuous transfer function across all operating modes-buck, buck-boost (four-switch), and boost-ensuring seamless transitions as VIN crosses VOUT. Its voltage-mode PWM control loop uses an error amplifier (VC pin) to set duty cycle, with internal timing resistor (RT pin) programming oscillator frequency and MODE/SYNC pin enabling either fixed-frequency operation or external synchronization.
It integrates dual N-channel (0.19Ω RDS(ON)) and dual P-channel (0.22Ω RDS(ON)) MOSFETs, supports soft-start via SHDN/SS pin clamping, includes thermal shutdown, reverse current limiting (−400mA typical), and 2.7A peak input current limit. Shutdown current is <1µA, and VOUT disconnects from VIN during shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single Li-ion (2.7–4.2V), 3× alkaline/NiMH (3.6–4.5V), and wide-input portable systems. |
| Output Voltage Range | 2.5V to 5.5V - adjustable via FB resistor divider; reference voltage is 1.22V ±2.3% over temperature. |
| Max Continuous Output Current | 600mA - achievable across full VIN/VOUT range with proper thermal design in DFN package. |
| Quiescent Current (Burst Mode) | 25µA typical - extends battery runtime in low-power standby states without compromising regulation. |
| Switching Frequency Range | 300kHz to 2MHz - programmable via RT pin; enables optimization of size (higher f → smaller L/C) vs. efficiency (lower f → lower switching loss). |
| Efficiency | Up to 96% - achieved using synchronous rectification; no external Schottky required for VOUT < 4.3V. |
| Shutdown Current | <1µA - ensures near-zero power drain when disabled; VOUT fully disconnected from VIN. |
Pinout & Package
The LTC3440EDD#TRPBF is housed in a thermally enhanced 10-lead (3mm × 3mm) plastic DFN package with exposed pad (Pin 11), which must be soldered to PCB ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RT (Pin 1) | Oscillator timing resistor connection | Programs switching frequency from 300kHz to 2MHz; RT = 6×10¹⁰/fOSC (Hz). |
| MODE/SYNC (Pin 2) | Mode control / external clock input | High = Burst Mode; low or external 2×fSW clock = fixed-frequency operation. |
| SW1 (Pin 3) | Internal switch node A/B junction | Connects to one end of inductor; optional Schottky to GND improves light-load efficiency. |
| SW2 (Pin 4) | Internal switch node C/D junction | Connects to other inductor end; Schottky to VOUT required if VOUT > 4.3V. |
| GND (Pin 5) | Signal and power ground | Reference for all analog and power circuits; connects to exposed pad (Pin 11). |
| VOUT (Pin 6) | Regulated output supply | Delivers regulated voltage; requires ceramic output capacitor (e.g., 22µF) to GND. |
| VIN (Pin 7) | Main input supply and IC bias | Accepts 2.5–5.5V; requires local 4.7µF+ low-ESR ceramic bypass to GND. |
| SHDN/SS (Pin 8) | Combined shutdown and soft-start control | Ground = shutdown (<1µA); >1.5V = enable; RC network provides controlled VC ramp-up. |
| FB (Pin 9) | Feedback voltage sensing | Monitors resistor divider; regulates VOUT = 1.22V × (1 + R1/R2); input bias current <50nA. |
| VC (Pin 10) | Error amplifier output | Loop compensation node; connects to FB via Type I or Type III network for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous four-switch architecture | Enables true buck-boost operation with continuous conduction across VIN/VOUT crossover without mode-hopping artifacts. |
| User-selectable Burst Mode® | Reduces quiescent current to 25µA while maintaining regulation-critical for battery life in intermittent-load applications. |
| Integrated low-RDS(ON) MOSFETs | 0.19Ω NMOS (switches B/C) and 0.22Ω PMOS (switches A/D) eliminate external diodes for VOUT < 4.3V, saving board space and conduction loss. |
| Programmable and synchronizable oscillator | RT pin sets frequency from 300kHz–2MHz; MODE/SYNC accepts external clock for EMI-sensitive designs or multi-rail synchronization. |
| Thermally optimized DFN package | 3mm × 3mm footprint with exposed pad (θJA = 43°C/W) enables high-power-density layouts in space-constrained portable devices. |
Applications
| Palmtop Computers | Handheld Instruments |
|---|---|
Use Scenario: Powering 3.3V logic and display subsystems from a single Li-ion cell (2.7–4.2V) with dynamic load steps. IC Role / Device Role / Timing Role: Primary buck-boost regulator delivering stable 3.3V output while seamlessly transitioning between buck and boost as battery discharges. Use Value: Eliminates need for separate buck and boost converters; maintains regulation down to 2.5V input, extending usable battery capacity by ~15% versus fixed-topology solutions. | Use Scenario: Supplying 5.0V analog front-end and 3.3V microcontroller from 3× alkaline cells (4.5–3.0V) in portable test equipment. IC Role / Device Role / Timing Role: Single-inductor buck-boost regulator supporting wide input range and precise output accuracy (±1.5%) across temperature. Use Value: Reduces bill-of-materials count and PCB area versus dual-converter approach; Burst Mode extends battery life during measurement standby. |
| MP3 Players | Digital Cameras |
Use Scenario: Generating 3.3V for audio DAC, flash memory, and LCD backlight driver from 1-cell Li-ion with burst-mode sleep cycles. IC Role / Device Role / Timing Role: High-efficiency power source with <1µA shutdown and 25µA Burst Mode current, minimizing self-discharge during idle periods. Use Value: Enables >100-hour playback on single charge; low-noise fixed-frequency mode avoids interference with sensitive audio paths. | Use Scenario: Powering image sensor, ISP, and SD card interface from 2× Li-ion (7.2–6.0V) or single-cell (3.6–2.7V) configurations with fast transient response. IC Role / Device Role / Timing Role: Buck-boost controller supporting both high-current burst (flash charging) and low-quiescent standby modes. Use Value: Delivers 600mA peak current for flash LED drivers while maintaining <2% output ripple; thermal DFN package sustains performance during extended video capture. |
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 | Higher 96% peak efficiency at 1A; fixed 2.5MHz switching; no Burst Mode-uses PFM at light loads; 0.015Ω MOSFETs. | Optimized for higher-current, compact applications (e.g., wearables); lacks programmable frequency and explicit Burst Mode enable pin. | Select TPS63020DSJR when board space is critical and 1A output is needed; LTC3440EDD#TRPBF preferred when frequency tuning, low-noise fixed-f operation, or explicit Burst Mode control is required. |
| MAX77827AEWE+T | Integrated battery charger + buck-boost; 3.2V–4.4V input; 2.6V–5.2V output; 2.5A max; I²C programmable; no RT pin. | Targeted at battery-powered systems needing charging + regulation in one IC; not a drop-in replacement due to different feature set and pinout. | Choose MAX77827AEWE+T only when battery charging functionality is mandatory; LTC3440EDD#TRPBF remains optimal for standalone, highly configurable buck-boost regulation with minimal external components. |
Compared with TPS63020DSJR and MAX77827AEWE+T, the LTC3440EDD#TRPBF offers unique flexibility in oscillator programming, explicit Burst Mode control via a dedicated pin, and proven robustness in industrial handhelds-making it ideal where design adaptability and long-term supply stability outweigh integration density.
Availability
LTC3440EDD#TRPBF is available at Aetrix Electronics and suitable for palmtop computers, handheld instruments, MP3 players, and digital cameras requiring stable component supply, long-lifecycle support, and consistent parametric performance across temperature.
Supply support for LTC3440EDD#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3440EDD#TRPBF belongs to Linear's legacy micropower DC/DC converter product line, engineered specifically for battery-powered portable electronics demanding ultra-low quiescent current, seamless buck-boost operation, and minimal external component count.
FAQ
What is the maximum output current capability of the LTC3440EDD#TRPBF?
The LTC3440EDD#TRPBF delivers up to 600mA continuous output current across its full 2.5V–5.5V input and output range when implemented with appropriate thermal design in its 3mm × 3mm DFN package. Peak inductor current reaches ~400mA in Burst Mode and up to 2.7A during current-limit events. Actual sustained current depends on ambient temperature, PCB copper area, and inductor saturation rating.
Does the LTC3440EDD#TRPBF require external Schottky diodes?
The LTC3440EDD#TRPBF does not require external Schottky diodes for output voltages below 4.3V, thanks to its integrated synchronous MOSFETs. However, a Schottky diode from SW2 to VOUT is mandatory for VOUT > 4.3V to clamp SW2 voltage, and an optional Schottky from SW1 to GND can improve light-load efficiency by ~1–2% in fixed-frequency mode.
How is the switching frequency programmed on the LTC3440EDD#TRPBF?
The switching frequency of the LTC3440EDD#TRPBF is programmed using an external resistor (RT) connected from Pin 1 (RT) to GND. The relationship is fOSC = 6×10¹⁰ / RT (Hz), supporting 300kHz to 2MHz. For synchronized operation, apply a 2×fSW clock to MODE/SYNC (Pin 2), with RT recalculated as 8×10¹⁰ / fSW.
What is the purpose of the exposed pad on the LTC3440EDD#TRPBF DFN package?
The exposed pad (Pin 11) on the LTC3440EDD#TRPBF DFN package is electrically and thermally connected to GND. It must be soldered to a PCB thermal pad tied to ground plane to achieve the specified θJA = 43°C/W and ensure reliable operation at full 600mA load. Omitting this connection risks thermal shutdown or reduced lifetime.
Can the LTC3440EDD#TRPBF operate with input voltage equal to output voltage?
Yes-the LTC3440EDD#TRPBF is explicitly designed for buck-boost operation where VIN equals VOUT (e.g., 3.3V in, 3.3V out). In this condition, it enters the "four-switch" or buck-boost region, maintaining regulation with continuous conduction and minimal output ripple, unlike conventional buck or boost converters that fail at VIN = VOUT.
LTC3440EDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-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):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 600mA
- Frequency - Switching:
- 300kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LTC3440EDD#TRPBF FAQ
1.How can I place an order for LTC3440EDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3440EDD#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 LTC3440EDD#TRPBF reliable?
The price and inventory of LTC3440EDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3440EDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3440EDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3440EDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3440EDD#TRPBF?
LTC3440EDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3440EDD#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 LTC3440EDD#TRPBF?
For technical support, including LTC3440EDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3440EDD#TRPBF requirements.
6.How does Aetrix verify that LTC3440EDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3440EDD#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 LTC3440EDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3440EDD#TRPBF?
All LTC3440EDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3440EDD#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 LTC3440EDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3440EDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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