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Analog Devices Inc. LTC3440EMS#TRPBF
- Part No.:
- LTC3440EMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC3440EMS#TRPBF.pdf
- Description:
- IC REG BUCK BST ADJ 600MA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:11,787
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Product details
Overview
LTC3440EMS#TRPBF from Analog Devices (formerly Linear Technology) is a micropower synchronous buck-boost DC/DC converter IC designed for single-cell Li-ion, multi-cell alkaline, or NiMH battery-powered systems where input voltage may fall above, below, or equal to the regulated output. It delivers up to 600mA continuous output current across a 2.5V–5.5V input/output range, achieves 96% peak efficiency via synchronous rectification, and operates with only 25µA quiescent current in Burst Mode®-enabling extended runtime in handheld instruments and MP3 players.
For engineers reviewing the LTC3440EMS#TRPBF datasheet, LTC3440EMS#TRPBF pinout, LTC3440EMS#TRPBF application, or LTC3440EMS#TRPBF equivalent, key selection considerations include its fixed-frequency programmable oscillator (300kHz–2MHz), user-controllable Burst Mode enable via MODE/SYNC pin, 10-pin MSOP thermal performance (θJA = 100°C/W on 4-layer board), and integrated 0.19Ω NMOS / 0.22Ω PMOS switch pairs eliminating external Schottky diodes for VOUT < 4.3V.
Technical Context
The LTC3440EMS#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 seamless mode transitions without output discontinuity. Its voltage-mode PWM control loop uses an error amplifier output (VC pin) to directly modulate switch duty cycles, with internal clamping and soft-start integration via the SHDN/SS pin.
Switching is governed by a resistor-programmable oscillator (RT pin) or external synchronization (MODE/SYNC pin), supporting precise frequency placement to avoid RF interference bands. Protection features include 2.7A peak input current limit, –400mA reverse current limit, thermal shutdown, and <1µA shutdown current-making it suitable for space-constrained, thermally sensitive portable electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input/Output Range | 2.5V to 5.5V - supports single Li-ion (2.7–4.2V), 3× alkaline (3.6–4.5V), or NiMH (3.0–4.2V) without rail translation |
| Continuous Output Current | 600mA - sufficient for core logic, display backlight, and audio codecs in handheld devices |
| Quiescent Current (Burst Mode) | 25µA - extends battery life in low-duty-cycle monitoring or sleep-state operation |
| Peak Efficiency | 96% - achieved via synchronous N/P-channel MOSFETs; eliminates Schottky losses below 4.3V output |
| Oscillator Frequency Range | 300kHz to 2MHz - programmable via RT resistor; enables EMI optimization and compact magnetics |
| Shutdown Current | <1µA - ensures negligible battery drain during system standby or power-off |
| Feedback Reference Voltage | 1.22V ±2.3% - sets output via external resistor divider; enables precise 2.5V–5.5V adjustable regulation |
Pinout & Package
Package: 10-Lead Plastic MSOP (3mm × 3mm footprint, 0.85mm height), thermally enhanced with θJA = 100°C/W on 4-layer PCB. Exposed pad not present (DFN variant has exposed GND pad; MSOP does not).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 RT | Oscillator timing input | Connects to ground via resistor to set switching frequency (f = 6×10¹⁰/RT Hz); enables EMI tuning and layout flexibility |
| 2 MODE/SYNC | Mode control / clock sync input | High = Burst Mode; low or external 2×fSW clock = fixed-frequency operation; critical for dynamic load response trade-offs |
| 3 SW1 | Switch node A/B connection | Connects internal NMOS B and PMOS A; ties to one end of inductor; requires short trace to minimize EMI and voltage spikes |
| 4 SW2 | Switch node C/D connection | Connects internal NMOS C and PMOS D; ties to other inductor end; needs Schottky diode to VOUT if VOUT > 4.3V |
| 5 GND | Signal and power ground | Common reference for all analog and power circuits; must be low-impedance plane under IC for stability |
| 6 VOUT | Regulated output | Delivers final DC voltage; connects to bulk and ceramic output capacitors; sensitive to layout parasitics |
| 7 VIN | Input supply and internal bias | Supplies IC core; requires ≥4.7µF low-ESR ceramic capacitor placed adjacent to pin and GND |
| 8 SHDN/SS | Shutdown and soft-start control | Ground = shutdown (<1µA); >1.5V = enable; RC network here provides controlled VC ramp for inrush limiting |
| 9 FB | Feedback input | Monitors output via resistor divider; 1.22V reference enables accurate VOUT programming; high-impedance node (≤50nA bias) |
| 10 VC | Error amplifier output | Drives compensation network (R/C to FB); determines duty cycle; clamped during soft-start and overload |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous 4-switch architecture | Enables true buck-boost operation with continuous conduction across VIN/VOUT crossover-no output glitch or mode-hopping artifacts |
| Burst Mode® with 25µA IQ | Extends battery life in intermittent-load applications (e.g., sensor polling) while maintaining regulation; ripple frequency varies with load |
| Programmable 300kHz–2MHz oscillator | Allows frequency placement outside sensitive IF bands (e.g., 455kHz, 1.1MHz); supports smaller inductors at higher frequencies |
| Integrated 0.19Ω NMOS / 0.22Ω PMOS switches | Eliminates external Schottky diodes for VOUT < 4.3V-reducing BOM count, footprint, and forward-drop losses |
| VIN-disconnect during shutdown | Prevents backfeed from VOUT to VIN when disabled-critical for battery isolation and system-level power sequencing |
| Thermal shutdown & current limit | Protects against sustained overload or poor heatsinking; 2.7A peak switch current limit prevents MOSFET failure under short-circuit |
Applications
| Handheld Instruments | MP3 Players |
|---|---|
Use Scenario: Portable multimeter or data logger powered by 3× AA alkaline cells (3.6–4.5V) requiring stable 3.3V for MCU and ADC. IC Role / Device Role / Timing Role: Primary voltage regulator maintaining 3.3V output as battery discharges from 4.5V down to 3.0V-operating across buck and buck/boost regions. Use Value: Eliminates need for separate buck and boost stages; 25µA Burst Mode IQ extends battery life beyond 100 hours in sleep mode. |
Use Scenario: Flash-based audio player using single Li-ion cell (2.7–4.2V) powering 3.3V audio DAC and 1.8V logic rails. IC Role / Device Role / Timing Role: Main 3.3V supply delivering up to 600mA peak during headphone drive; synchronizable to system clock to suppress audible switching noise. Use Value: 96% efficiency minimizes heat in sealed enclosure; 10-pin MSOP fits tight PCB real estate; no external diodes reduce component count. |
| Digital Cameras | Palmtop Computers |
Use Scenario: Compact camera with CMOS image sensor and LCD requiring 2.8V and 3.3V rails from dual-cell NiMH (2.4–3.0V). IC Role / Device Role / Timing Role: Generates 3.3V main rail; operates in boost mode at low battery, transitioning seamlessly to buck/boost as voltage rises. Use Value: Continuous transfer function avoids image corruption during mode transitions; 2MHz option allows ultra-small 4.7µH inductor. |
Use Scenario: Legacy palmtop PDA with ARM processor and touchscreen controller running from 3.6V nominal alkaline pack. IC Role / Device Role / Timing Role: System power manager providing regulated 3.3V and enabling clean shutdown via SHDN/SS pin control. Use Value: <1µA shutdown current preserves battery during weeks of storage; soft-start prevents brownout on cold boot. |
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 95% typical efficiency at 1A, but 40µA Burst Mode IQ; fixed 2.5MHz or 1MHz options (no resistor programming) | Preferred for higher-current loads (>600mA) and tighter EMI constraints; lacks RT pin flexibility | Select TPS63020DSJR when output current exceeds 600mA or when fixed high-frequency operation simplifies filtering. |
| MAX77827AEWE+T | Integrated I²C interface, programmable VOUT (0.6–3.775V), 1.2MHz fixed frequency; 28µA IQ in ultralow-power mode | Suited for systems requiring dynamic voltage scaling or telemetry; adds firmware dependency vs. analog-only LTC3440EMS#TRPBF | Choose MAX77827AEWE+T when digital control, multiple output voltages, or telemetry feedback are required. |
Compared with TPS63020DSJR and MAX77827AEWE+T, the LTC3440EMS#TRPBF offers unique analog configurability (RT resistor, MODE/SYNC pin control), lowest quiescent current in Burst Mode (25µA), and proven robustness in cost-sensitive portable designs-making it optimal for fixed-output, low-IQ, and layout-simple applications.
Availability
LTC3440EMS#TRPBF is available at Aetrix Electronics and suitable for handheld instruments, MP3 players, and digital cameras requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for LTC3440EMS#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 technical and manufacturing continuity for the LTC product line, renowned for precision analog, power management, and signal conditioning ICs.
The LTC3440EMS#TRPBF belongs to Linear's micropower DC/DC converter family, engineered specifically for battery-powered portable electronics where input voltage variability, ultra-low quiescent current, and seamless buck-boost operation are mandatory design requirements.
FAQ
What is the minimum input voltage required to start up the LTC3440EMS#TRPBF?
The LTC3440EMS#TRPBF has a guaranteed input start-up voltage of 2.4V (typical 2.5V). Below this threshold, the device will not initiate switching or regulate output. This ensures reliable operation across the full discharge curve of a single Li-ion cell (2.7–4.2V) or three alkaline cells (down to ~2.4V under load), making the LTC3440EMS#TRPBF well-suited for deep-discharge battery applications.
Can the LTC3440EMS#TRPBF operate with an output voltage higher than 4.3V?
Yes, the LTC3440EMS#TRPBF supports output voltages up to 5.5V, but a Schottky diode must be placed from SW2 to VOUT when VOUT exceeds 4.3V. This protects the internal PMOS switch D from exceeding its absolute maximum voltage rating during switching transients. The LTC3440EMS#TRPBF datasheet specifies the PMEG2010EA or equivalent low-capacitance Schottky as recommended-placed as close as possible to the SW2 and VOUT pins.
How does Burst Mode® operation affect output voltage ripple on the LTC3440EMS#TRPBF?
In Burst Mode®, the LTC3440EMS#TRPBF delivers energy in discrete packets and then sleeps, causing output voltage ripple with a variable, load-dependent frequency-not the fixed switching frequency. Ripple amplitude remains within typical 20–30mVpp for 22µF ceramic output capacitance, but spectral content spreads below 100kHz. For noise-sensitive analog circuits, fixed-frequency mode is preferred; Burst Mode® is ideal for maximizing battery life where ripple is acceptable.
Is the LTC3440EMS#TRPBF pin-compatible with the DFN-packaged LTC3440EDD#TRPBF?
No, the LTC3440EMS#TRPBF (10-lead MSOP) and LTC3440EDD#TRPBF (10-lead 3mm×3mm DFN) share identical electrical functionality and pin functions, but differ in physical layout, thermal pad configuration (DFN has exposed GND pad; MSOP does not), and package dimensions. PCB footprints and reflow profiles are not interchangeable-separate layout and qualification are required for each package variant of the LTC3440EMS#TRPBF.
What is the maximum achievable switching frequency when synchronizing the LTC3440EMS#TRPBF to an external clock?
The LTC3440EMS#TRPBF supports external synchronization up to 2MHz. The MODE/SYNC pin accepts a clock signal at exactly twice the desired switching frequency (e.g., 4MHz clock for 2MHz operation), with pulse width between 100ns and 2µs. The internal oscillator must be programmed slower than the target frequency using the RT resistor (RT = 8×10¹⁰/fSW) to ensure reliable lock-verified in the LTC3440EMS#TRPBF datasheet Figure 1 and Synchronization section.
LTC3440EMS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- 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-MSOP
LTC3440EMS#TRPBF FAQ
1.How can I place an order for LTC3440EMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3440EMS#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 LTC3440EMS#TRPBF reliable?
The price and inventory of LTC3440EMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3440EMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3440EMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3440EMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3440EMS#TRPBF?
LTC3440EMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3440EMS#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 LTC3440EMS#TRPBF?
For technical support, including LTC3440EMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3440EMS#TRPBF requirements.
6.How does Aetrix verify that LTC3440EMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3440EMS#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 LTC3440EMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3440EMS#TRPBF?
All LTC3440EMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3440EMS#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 LTC3440EMS#TRPBF part is unused and in its original packaging.
Return procedure for LTC3440EMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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