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Analog Devices Inc. LTC3440EMS#PBF
- Part No.:
- LTC3440EMS#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC3440EMS#PBF.pdf
- Description:
- IC REG BUCK BST ADJ 600MA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:912
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Product details
Overview
LTC3440EMS#PBF 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, features 25µA quiescent current in Burst Mode®, and operates at programmable frequencies from 300kHz to 2MHz in a thermally enhanced 10-pin MSOP package.
For engineers reviewing the LTC3440EMS#PBF datasheet, LTC3440EMS#PBF pinout, LTC3440EMS#PBF application, or LTC3440EMS#PBF equivalent, key selection considerations include its fixed-frequency/burst-mode dual operating mode, 0.19Ω NMOS / 0.22Ω PMOS internal switch RDS(ON), shutdown current <1µA, soft-start/shutdown combined pin functionality, and compatibility with single-inductor buck-boost topologies requiring seamless VIN-to-VOUT crossover.
Technical Context
The LTC3440EMS#PBF implements a proprietary four-switch synchronous buck-boost topology with continuous transfer function across buck, buck-boost (four-switch), and boost regions-enabling stable regulation without mode transitions or discontinuities. Its voltage-mode PWM control loop uses an error amplifier output (VC pin) to directly determine switch duty cycles, with internal clamping for soft-start and overcurrent protection.
Switching is governed by a resistor-programmable oscillator (RT pin) or external synchronization via MODE/SYNC pin, supporting precise frequency control up to 2MHz. Internal current limiting (2.7A peak), reverse-current protection (–400mA), thermal shutdown, and 1.22V ±2.3% feedback reference ensure robust operation in portable power applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input/Output Range | 2.5V to 5.5V - supports direct regulation from single Li-ion (2.7–4.2V) or 3-cell alkaline/NiMH without intermediate rails. |
| Max Output Current | 600mA continuous - sufficient for core logic, displays, and peripherals in handheld instruments and MP3 players. |
| Quiescent Current | 25µA in Burst Mode® - extends battery runtime in low-power standby states without manual enable/disable cycling. |
| Switch RDS(ON) | 0.19Ω (NMOS), 0.22Ω (PMOS) - enables >96% peak efficiency and minimizes conduction loss at high load currents. |
| Oscillator Range | 300kHz to 2MHz - allows trade-off between component size (higher f) and switching loss (lower f) per application EMI constraints. |
| Shutdown Current | <1µA - ensures near-zero battery drain during system sleep or off-state, critical for always-on sensors. |
| Feedback Voltage | 1.22V ±2.3% - sets output via external resistor divider; enables precise 2.5V–5.5V adjustable VOUT with minimal tolerance drift. |
Pinout & Package
Package: 10-lead plastic MSOP (3mm × 3mm footprint, 0.5mm pitch), thermally enhanced with θJA = 100°C/W (4-layer board).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| RT (1) | Oscillator timing input | Connects to ground via resistor to set switching frequency (f = 6×10¹⁰/RT Hz); enables precise noise-aware frequency selection. |
| MODE/SYNC (2) | Mode control / sync input | High = Burst Mode®; low or external clock = fixed-frequency operation; clock input must be 2× fSW with 100ns–2µs pulse width. |
| SW1 (3) | Switch node A/B connection | Connects internal NMOS B and PMOS A; ties to one end of inductor; optional Schottky to GND improves light-load efficiency. |
| SW2 (4) | Switch node C/D connection | Connects internal NMOS C and PMOS D; ties to other inductor end; Schottky to VOUT required if VOUT > 4.3V. |
| GND (5) | Signal and power ground | Common return for all analog/digital circuits and power switches; exposed pad in DFN variant is GND but not present in MSOP. |
| VOUT (6) | Regulated output | Delivers final DC output; requires ceramic filter capacitor (e.g., 22µF) from VOUT to GND for ripple suppression. |
| VIN (7) | Input supply and IC bias | Accepts 2.5–5.5V input; powers internal circuitry; requires local 4.7µF+ low-ESR ceramic bypass to GND. |
| SHDN/SS (8) | Combined shutdown & soft-start | Ground = shutdown (<1µA IQ); >1.5V = enable; RC network here controls VC ramp rate for controlled output rise. |
| FB (9) | Feedback sense input | Monitors resistor divider output; compares to 1.22V reference to regulate VOUT; high-impedance (≤50nA IIN) minimizes divider error. |
| VC (10) | Error amplifier output | Drives compensation network (RC/Z network to FB); voltage level determines switch duty cycle; clamped during soft-start/shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Single-inductor buck-boost topology | Eliminates need for separate buck + boost stages or coupled inductors-reduces BOM count, PCB area, and design complexity in space-constrained devices. |
| Synchronous rectification | Integrated 0.19Ω NMOS and 0.22Ω PMOS switches replace external Schottky diodes (for VOUT < 4.3V), improving efficiency and eliminating reverse recovery losses. |
| Burst Mode® operation | Reduces quiescent current to 25µA while maintaining regulation-ideal for intermittent-use portable electronics like digital cameras and handheld test gear. |
| Programmable & synchronizable oscillator | RT-resistor programming (300kHz–2MHz) plus MODE/SYNC pin synchronization enables EMI mitigation in RF-sensitive systems such as MP3 players. |
| VOUT disconnection during shutdown | Internal switches isolate VOUT from VIN when SHDN/SS is grounded-prevents backfeed, protects downstream circuitry, and ensures true zero-output leakage. |
Applications
| Palmtop Computers | Handheld Instruments |
|---|---|
Use Scenario: Powering 3.3V logic, display drivers, and USB interface from a single Li-ion cell (2.7–4.2V). IC Role / Device Role / Timing Role: Primary system regulator providing stable 3.3V rail regardless of battery voltage sag or recharge state. Use Value: Eliminates need for separate LDO or charge-pump backup; maintains full functionality down to 2.5V input while delivering 600mA peak current. | Use Scenario: Supplying precision ADC, microcontroller, and sensor interface in battery-operated multimeters or data loggers. IC Role / Device Role / Timing Role: High-efficiency, low-noise power source with Burst Mode® enabling weeks of standby life on AA batteries. Use Value: 25µA quiescent current and <1µA shutdown extend battery life; fixed-frequency mode ensures clean spectral profile for sensitive analog measurements. |
| MP3 Players | Digital Cameras |
Use Scenario: Generating 3.3V for audio codec, flash memory, and LCD backlight driver from 3× alkaline cells (3.0–4.5V). IC Role / Device Role / Timing Role: Single-chip solution handling both buck (fresh batteries) and boost (depleted batteries) without firmware intervention. Use Value: Seamless VIN–VOUT crossover prevents audio dropout or display flicker during battery discharge; 96% peak efficiency preserves playback time. | Use Scenario: Powering image sensor, ISP, and SD card interface in compact point-and-shoot cameras using Li-ion or Li-poly packs. IC Role / Device Role / Timing Role: High-current (600mA) regulator supporting burst-mode image capture and video recording with fast transient response. Use Value: Programmable 1–2MHz switching enables small 10µH inductor and 22µF ceramic output cap-reducing solution size vs. lower-frequency alternatives. |
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% typical efficiency at 1A, integrated 2A switches, but 2.5µA quiescent current in LP mode (vs. 25µA Burst Mode®); no RT pin-fixed 2.4MHz or 1.2MHz options only. | Preferred for higher-current, lower-noise apps; less suitable for ultra-low-IQ battery standby where LTC3440EMS#PBF's 25µA provides longer shelf life. | Select TPS63020DSJR when output current >600mA or fixed high-frequency EMI control is mandatory; retain LTC3440EMS#PBF for sub-100µA IQ optimization and resistor-programmable flexibility. |
| MAX77827AEWA+ | Supports wider 1.8–5.5V input, includes I2C control and power-good flag; quiescent current 20µA (slightly lower), but only 400mA max output and no Burst Mode®-uses PFM instead. | Better for digitally managed power trees; unsuitable for analog-sensitive designs requiring fixed-frequency operation or seamless VIN/VOUT crossover behavior. | Choose MAX77827AEWA+ when system-level power sequencing or telemetry is needed; LTC3440EMS#PBF remains optimal for analog-stable, pin-controlled, single-inductor simplicity. |
Compared with TPS63020DSJR and MAX77827AEWA+, the LTC3440EMS#PBF uniquely balances ultra-low quiescent current (25µA), resistor-programmable frequency, and true seamless buck-boost transition-making it the preferred choice for cost-sensitive, analog-critical, and long-battery-life portable instrumentation where programmability and minimal external components are prioritized.
Availability
LTC3440EMS#PBF is available at Aetrix Electronics and suitable for palmtop computers, handheld instruments, and digital cameras requiring stable component supply with guaranteed long-term manufacturability and consistent electrical performance across production lots.
Supply support for LTC3440EMS#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and consumer markets.
The LTC3440EMS#PBF belongs to Linear's legacy micropower DC/DC converter product line, engineered specifically for battery-powered portable electronics demanding high efficiency across wide input-voltage ranges without sacrificing regulation stability or solution size.
FAQ
What is the minimum input voltage required to start up the LTC3440EMS#PBF?
The LTC3440EMS#PBF 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 specification ensures reliable operation across the full discharge curve of single Li-ion cells (2.7V–4.2V) and three-cell alkaline stacks (3.0V–4.5V), making the LTC3440EMS#PBF well-suited for applications where deep battery discharge must be tolerated without brownout.
Does the LTC3440EMS#PBF require external Schottky diodes for proper operation?
The LTC3440EMS#PBF does not require external Schottky diodes for basic operation when VOUT ≤ 4.3V, thanks to its fully synchronous four-switch architecture. However, a Schottky diode from SW2 to VOUT is mandatory if VOUT exceeds 4.3V to clamp SW2 voltage spikes. Optional Schottky diodes from SW1 to GND and SW2 to VOUT can improve peak efficiency by 1–2% under certain conditions, but are not essential for functional regulation of the LTC3440EMS#PBF.
How does Burst Mode® operation affect output voltage ripple on the LTC3440EMS#PBF?
In Burst Mode®, the LTC3440EMS#PBF delivers energy in discrete packets and then sleeps, causing output voltage ripple with variable frequency dependent on load current-not fixed switching frequency. Ripple amplitude increases at lighter loads due to longer sleep intervals, but remains within specification for typical portable applications. For low-noise analog circuits, fixed-frequency mode is recommended; Burst Mode® is optimized for maximizing battery life in intermittently active systems using the LTC3440EMS#PBF.
Can the LTC3440EMS#PBF be synchronized to an external clock, and what are the timing requirements?
Yes, the LTC3440EMS#PBF can be synchronized via its MODE/SYNC pin. The external clock must be exactly twice the desired switching frequency (e.g., 2.4MHz for 1.2MHz operation) with pulse width between 100ns and 2µs. The internal oscillator's RT resistor must be selected per RT = 8×10¹⁰/fSW to ensure reliable lock. This capability allows the LTC3440EMS#PBF to avoid sensitive IF bands in RF systems such as MP3 players and wireless handheld instruments.
What thermal performance can be expected from the LTC3440EMS#PBF in its MSOP package?
The LTC3440EMS#PBF in the 10-lead MSOP package has a junction-to-ambient thermal resistance (θJA) of 100°C/W on a 4-layer PCB and 130°C/W on a 1-layer board. With maximum power dissipation of ~450mW (at 600mA, 0.4V dropout), junction temperature rise remains within safe limits (<45°C rise) under typical conditions. For sustained high-current operation, layout best practices-including wide copper pours under the IC and multiple thermal vias-are strongly recommended to maintain reliability of the LTC3440EMS#PBF.
LTC3440EMS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- 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):
- 2.5V
- 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#PBF FAQ
1.How can I place an order for LTC3440EMS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3440EMS#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 LTC3440EMS#PBF reliable?
The price and inventory of LTC3440EMS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3440EMS#PBF is usually 5 days.
3.What payment methods are accepted for LTC3440EMS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3440EMS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3440EMS#PBF?
LTC3440EMS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3440EMS#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 LTC3440EMS#PBF?
For technical support, including LTC3440EMS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3440EMS#PBF requirements.
6.How does Aetrix verify that LTC3440EMS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3440EMS#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 LTC3440EMS#PBF meets industry standards.
7.What is the process for return or replacement of LTC3440EMS#PBF?
All LTC3440EMS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3440EMS#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 LTC3440EMS#PBF part is unused and in its original packaging.
Return procedure for LTC3440EMS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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