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Analog Devices Inc. LTC3240EDC-2.5#TRMPBF
- Part No.:
- LTC3240EDC-2.5#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3240EDC-2.5#TRMPBF.pdf
- Description:
- IC REG CHRG PUMP 2.5V 150MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:933
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Product details
Overview
LTC3240EDC-2.5#TRMPBF from Analog Devices (formerly Linear Technology) is a fixed-output, step-up/step-down charge pump DC/DC converter delivering 2.5V at up to 60mA across 1.8V–5.5V input, operating as an LDO above VIN ≥ 2.6V and switching to 1.2MHz doubling mode below, used in low-power handheld logic and I/O supplies.
For engineers reviewing the LTC3240EDC-2.5#TRMPBF datasheet, LTC3240EDC-2.5#TRMPBF pinout, LTC3240EDC-2.5#TRMPBF application, or LTC3240EDC-2.5#TRMPBF equivalent, key selection criteria include automatic mode transition threshold (VIN ≈ VOUT + 100mV), 65µA no-load quiescent current, 2.5V ±4% output accuracy over temperature, short-circuit protection, and 2mm × 2mm DFN thermal performance with exposed pad grounding.
Technical Context
The LTC3240EDC-2.5#TRMPBF implements dual-mode regulation: linear LDO operation when VIN exceeds VOUT by >100mV (e.g., 2.8V input → 2.5V output), and constant-frequency 1.2MHz voltage-doubling charge pump operation when VIN drops within 100mV of VOUT (e.g., 2.4V input → 2.5V output). Mode switching is fully automatic and seamless without external control.
Its internal architecture includes a 1.2MHz oscillator driving nonoverlapping charge pump switches, soft-start circuitry limiting inrush to ≤300mA over ~2ms, and CMOS shutdown input with 0.4V/1.2V logic thresholds. Protection features include thermal shutdown at ~160°C and current limiting (270mA in step-up, 450mA in step-down mode).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±4% (2.4V–2.6V) over full –40°C to 85°C range and 1.8V–5.5V input |
| Input Voltage Range | 1.8V to 5.5V - supports single Li-ion, 2-cell NiMH, or 2-AA battery inputs |
| Max Output Current | 60mA continuous - limited by effective open-loop resistance (ROL = 8Ω at 1.8V) |
| No-Load Quiescent Current | 65µA typical - enables multi-week battery life in always-on sensor nodes |
| Shutdown Current | <1µA - disconnects VOUT from VIN and disables all internal circuitry |
| Switching Frequency | 1.2MHz (typ) in step-up mode - enables use of tiny 1µF ceramic flying capacitor |
| Output Ripple | 20mVP-P at 100mA load - specified for both 2.5V and 3.3V variants with 4.7µF COUT |
Pinout & Package
Package: 6-lead (2mm × 2mm) plastic DFN with exposed thermal pad (Pin 7), requiring solder connection to PCB ground plane for θJA = 80°C/W thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Power Ground Reference | Primary ground return path; must connect to solid PCB ground plane for stability and thermal management |
| VIN (Pin 2) | Input Supply Input | Accepts 1.8V–5.5V; requires ≥1µF low-ESR ceramic bypass capacitor placed adjacent to pin |
| VOUT (Pin 3) | Regulated Output | Delivers fixed 2.5V; requires ≥4.7µF low-ESR ceramic capacitor with ESR <0.5Ω for loop stability |
| C+ (Pin 4) | Flying Capacitor Positive | Connects to positive terminal of 1µF ceramic flying capacitor (non-polarized only) |
| C– (Pin 5) | Flying Capacitor Negative | Connects to negative terminal of same flying capacitor; polarity reversal occurs during operation |
| SHDN (Pin 6) | Active-Low Enable | CMOS input with 0.4V/1.2V thresholds; must be driven - floating causes undefined operation |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Step-Up/Step-Down Mode Switching | Transitions seamlessly at VIN ≈ VOUT + 100mV without external circuitry or configuration |
| Built-in Soft-Start | Ramps output current limit from 0 to 300mA over ~2ms to prevent inrush into large COUT |
| Thermal & Short-Circuit Protection | Current limits to 270mA (step-up) or 450mA (step-down); cycles in/out of shutdown at ~160°C junction |
| Ultralow Shutdown Current | <1µA with VOUT disconnected from VIN - critical for battery-backed real-time clocks |
| Minimal External Components | Requires only three 0603 ceramic capacitors (1µF CIN, 1µF CFLY, 4.7µF COUT) for full operation |
Applications
| 2-Cell NiMH to 2.5V Logic Supply | Low-Power Camera I/O Rail |
|---|---|
Use Scenario: Powering 2.5V microcontroller I/O banks and level-shifted sensors from two NiMH cells (1.8V–3.0V range). IC Role / Device Role / Timing Role: Regulated 2.5V supply generator with automatic LDO-to-charge-pump transition maintaining stable rail across battery discharge. Use Value: Eliminates need for separate LDO + boost converter; sustains 60mA load down to 1.8V cell voltage without brownout. | Use Scenario: Providing clean 2.5V bias for CMOS image sensor interface circuits in compact portable cameras. IC Role / Device Role / Timing Role: Low-noise, low-ripple power source with 20mVP-P ripple and burst-mode efficiency optimization at partial load. Use Value: Enables 65µA quiescent operation during sensor standby while delivering fast transient response during frame capture bursts. |
| PC Card 2.5V Auxiliary Rail | Handheld Medical Device Logic Supply |
Use Scenario: Generating isolated 2.5V auxiliary voltage for PCMCIA/CardBus interface logic in legacy industrial PDAs. IC Role / Device Role / Timing Role: Compact, self-contained DC/DC converter meeting JEDEC PC Card voltage tolerance (±4%) and transient requirements. Use Value: Fits within tight 2mm × 2mm footprint; achieves required regulation without external feedback resistors or compensation networks. | Use Scenario: Supplying 2.5V logic rails for low-duty-cycle patient monitoring sensors powered by coin cells or small Li-ion packs. IC Role / Device Role / Timing Role: Ultra-low IQ regulator enabling multi-month battery life with periodic wake-up and data transmission. Use Value: 65µA no-load current and sub-1µA shutdown extend shelf life; thermal protection ensures safety in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up/step-down charge pump applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3204B-2.5 | Same 2.5V output, but lacks Burst Mode; higher 48µA IQ; identical 6-lead DFN package and pinout | Suitable where predictable fixed-frequency operation is preferred over light-load efficiency optimization | Select LTC3204B-2.5 if deterministic switching behavior is required for EMI-sensitive systems |
| LTC3443 | Synchronous buck-boost IC; 96% peak efficiency; 2.4V–5.5V input; 2.4V min output; 10-lead DFN package | Higher current capability (600mA), wider input range, but larger footprint and more complex layout | Select LTC3443 only when >60mA output or tighter line/load regulation is required |
Compared with LTC3204B-2.5 and LTC3443, the LTC3240EDC-2.5#TRMPBF offers optimal balance of ultra-small size, automatic mode switching, and lowest quiescent current for <60mA 2.5V applications - making it uniquely suited for space-constrained, battery-powered devices where simplicity and standby efficiency are paramount.
Availability
LTC3240EDC-2.5#TRMPBF is available at Aetrix Electronics and suitable for low-power handheld logic supplies, medical sensor nodes, and PC card auxiliary rails requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3240EDC-2.5#TRMPBF 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 high-performance analog and power management portfolio.
The LTC3240 series was designed specifically for ultra-compact, low-quiescent-current DC/DC conversion in battery-powered portable electronics where input voltage varies widely across battery discharge curves.
FAQ
What is the minimum input voltage required for LTC3240EDC-2.5#TRMPBF to regulate 2.5V output?
The LTC3240EDC-2.5#TRMPBF regulates 2.5V output down to 1.8V input across the full –40°C to 85°C temperature range. Below 1.8V, regulation is not guaranteed per datasheet specifications. At 1.8V input, it operates exclusively in step-up (charge pump) mode with 60mA maximum output current and 2.5V ±4% accuracy.
Does LTC3240EDC-2.5#TRMPBF require external feedback resistors to set its output voltage?
No, the LTC3240EDC-2.5#TRMPBF has a factory-trimmed, fixed 2.5V output. It contains an internal resistor divider and reference circuit - no external feedback components are needed, simplifying design and reducing bill-of-materials count.
How does the LTC3240EDC-2.5#TRMPBF handle thermal overload conditions?
When junction temperature exceeds ~160°C, the LTC3240EDC-2.5#TRMPBF activates thermal shutdown, disabling output current delivery. It automatically resumes operation once junction temperature falls to ~150°C. This cycling continues indefinitely without latch-up or damage until the overload condition is removed.
Can LTC3240EDC-2.5#TRMPBF drive a 100mA load at 2.5V?
No - the LTC3240EDC-2.5#TRMPBF is rated for 60mA maximum continuous output current at 2.5V. Attempting 100mA will trigger current limiting (270mA in step-up mode) and cause output voltage collapse or thermal shutdown. For 100mA, consider LTC3240EDC-3.3#TRMPBF or alternative converters like LTC3443.
What is the purpose of the exposed pad (Pin 7) on the LTC3240EDC-2.5#TRMPBF DFN package?
The exposed pad (Pin 7) on the LTC3240EDC-2.5#TRMPBF is electrically and thermally connected to GND. It must be soldered to a PCB ground plane to achieve the specified θJA = 80°C/W thermal resistance and ensure reliable operation at full load - failure to do so degrades thermal performance and may trigger premature thermal shutdown.
LTC3240EDC-2.5#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 6-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 150mA
- Frequency - Switching:
- 1.2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (2x2)
LTC3240EDC-2.5#TRMPBF FAQ
1.How can I place an order for LTC3240EDC-2.5#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3240EDC-2.5#TRMPBF 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 LTC3240EDC-2.5#TRMPBF reliable?
The price and inventory of LTC3240EDC-2.5#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3240EDC-2.5#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3240EDC-2.5#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3240EDC-2.5#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3240EDC-2.5#TRMPBF?
LTC3240EDC-2.5#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3240EDC-2.5#TRMPBF 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 LTC3240EDC-2.5#TRMPBF?
For technical support, including LTC3240EDC-2.5#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3240EDC-2.5#TRMPBF requirements.
6.How does Aetrix verify that LTC3240EDC-2.5#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3240EDC-2.5#TRMPBF 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 LTC3240EDC-2.5#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3240EDC-2.5#TRMPBF?
All LTC3240EDC-2.5#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3240EDC-2.5#TRMPBF, 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 LTC3240EDC-2.5#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3240EDC-2.5#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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