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Analog Devices Inc. LTC3240EDC-3.3#TRMPBF
- Part No.:
- LTC3240EDC-3.3#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3240EDC-3.3#TRMPBF.pdf
- Description:
- IC REG CHRG PUMP 3.3V 150MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:12,642
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Product details
Overview
LTC3240EDC-3.3#TRMPBF from Analog Devices (formerly Linear Technology) is a fixed-output, step-up/step-down charge pump DC/DC converter delivering 3.3V at up to 150mA across an input range of 1.8V–5.5V. It operates as a low-dropout regulator when VIN > VOUT + 100mV and automatically switches to 1.2MHz constant-frequency charge pump mode when VIN drops within 100mV of 3.3V - enabling stable power for battery-powered I/O supplies in handheld cameras and PC cards.
For engineers reviewing the LTC3240EDC-3.3#TRMPBF datasheet, LTC3240EDC-3.3#TRMPBF pinout, LTC3240EDC-3.3#TRMPBF application, or LTC3240EDC-3.3#TRMPBF equivalent, key selection criteria include automatic mode switching behavior, 65µA no-load quiescent current, thermal/short-circuit protection, and compatibility with only three external ceramic capacitors in space-constrained designs.
Technical Context
The LTC3240EDC-3.3#TRMPBF integrates dual-mode regulation: LDO operation above VIN ≥ 3.4V ensures minimal dropout loss, while sub-3.4V inputs trigger a 1.2MHz voltage-doubling charge pump with internal nonoverlapping clock control and flying capacitor (C+, C−) switching. Regulation uses an internal resistor divider and error amplifier to modulate pump current based on output voltage deviation.
Burst Mode activates below ~15mA load to reduce switching losses, dropping quiescent current to 65µA; soft-start limits inrush by ramping output current to 300mA over ~2ms. Shutdown disconnects VOUT from VIN and draws <1µA, with CMOS-compatible SHDN pin (VIH = 1.2V, VIL = 0.4V) requiring defined logic levels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3.6% (3.168V–3.432V) over full temperature and load range |
| Input Voltage Range | 1.8V to 5.5V - supports single Li-ion, 2–3 NiMH/alkaline cells without external regulators |
| Max Output Current | 150mA in step-down (LDO) mode; 100mA sustained in step-up (charge pump) mode at VIN = 2.5V |
| Quiescent Current | 65µA typical at no load - enables multi-week battery life in always-on sensor nodes |
| Switching Frequency | 1.2MHz fixed in step-up mode - allows use of tiny 1µF ceramic flying capacitor and compact layout |
| Shutdown Current | <1µA - preserves battery during system sleep; output disconnected from input |
| Protection Features | Thermal shutdown (~160°C), short-circuit current limit (270–450mA depending on mode), and built-in soft-start |
Pinout & Package
Package: 6-lead (2mm × 2mm) plastic DFN with exposed pad (Pin 7), requiring soldering to PCB ground plane for thermal and electrical performance (θJA = 80°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Power and signal ground reference | Must connect to solid ground plane; primary return path for all internal currents |
| VIN (Pin 2) | Main input supply connection | Accepts 1.8V–5.5V; requires ≥1µF low-ESR ceramic bypass capacitor adjacent to pin |
| VOUT (Pin 3) | Regulated 3.3V output | Delivers up to 150mA; requires ≥4.7µF low-ESR ceramic capacitor for stability and ripple control |
| C+ (Pin 4) | Flying capacitor positive terminal | Connects to + side of 1µF ceramic flying capacitor; carries high-frequency switching current |
| C− (Pin 5) | Flying capacitor negative terminal | Connects to − side of same flying capacitor; forms charge-transfer path in doubler topology |
| SHDN (Pin 6) | Active-low enable/disable control | CMOS input (VIH = 1.2V, VIL = 0.4V); must be driven - floating prohibited |
| Exposed Pad (Pin 7) | Thermal and electrical ground | Internally connected to GND; mandatory soldering to PCB ground plane for thermal management |
Key Features
| Feature | Design Value |
|---|---|
| Automatic step-up/step-down mode switching | Seamlessly transitions between LDO and charge pump at VIN ≈ VOUT + 100mV - eliminates need for external mode control logic |
| Built-in soft-start | Ramps output current from 0 to 300mA over ~2ms - prevents inrush into large output capacitors and avoids input rail collapse |
| Ultralow shutdown current | <1µA with VOUT disconnected from VIN - critical for long-duration battery backup and zero-power sleep states |
| Integrated protection circuitry | Thermal shutdown (160°C) and current limiting (270–450mA) allow indefinite short-circuit survival without latch-up or damage |
| Minimal external component count | Only three 0603-size ceramic capacitors required (1µF CIN, 1µF CFLY, 4.7µF COUT) - reduces BOM cost and board area by >40% vs discrete solutions |
Applications
| Handheld Camera I/O Supply | PC Card Logic Power |
|---|---|
Use Scenario: Powering image sensor interface logic and SDIO controllers in ultra-thin digital cameras powered by single Li-ion (3.0–4.2V) or dual alkaline (2.4–3.2V) cells. IC Role / Device Role / Timing Role: Primary 3.3V regulator providing stable, low-noise supply independent of battery voltage sag during flash discharge or burst capture. Use Value: Maintains 3.3V regulation across full battery discharge curve (3.6V → 2.8V) via automatic LDO-to-charge-pump transition - eliminating brownouts during high-current sensor readout. |
Use Scenario: Generating 3.3V for PCMCIA/CompactFlash host controller logic and card detection circuitry in portable medical recorders and industrial data loggers. IC Role / Device Role / Timing Role: Standby-capable power source that remains active during card insertion/removal events while minimizing background drain. Use Value: 65µA no-load IQ and <1µA shutdown current extend battery runtime between data uploads; fast 400–500µs turn-on time meets PC Card hot-plug timing requirements. |
| Low-Power Audio Codec Bias | Wireless Sensor Node Core Supply |
Use Scenario: Supplying clean 3.3V bias to audio ADC/DAC and headphone drivers in Bluetooth headsets using 3.7V Li-ion cells. IC Role / Device Role / Timing Role: Low-ripple, low-noise power stage decoupled from noisy RF sections via ceramic capacitor filtering. Use Value: 20mVP-P output ripple at 100mA load and Burst Mode efficiency optimization at partial loads ensure SNR > 95dB in audio paths without additional LDO post-regulation. |
Use Scenario: Core 3.3V supply for sub-GHz RF transceivers (e.g., CC1101) and microcontrollers in battery-operated environmental sensors deployed for >5 years. IC Role / Device Role / Timing Role: Primary energy-harvesting-adjacent regulator accepting variable input from boost converters or direct battery feed. Use Value: 1.8V minimum input enables operation down to near-dead battery (e.g., 1.9V NiMH), while 65µA IQ extends shelf life and reduces duty-cycle energy overhead in wake-sleep cycles. |
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-3.3 | No Burst Mode; higher 48µA IQ; same 6-lead DFN package and 3.3V output | Better suited for moderate-load, noise-sensitive applications where constant-frequency operation is preferred over light-load efficiency | Select LTC3204B-3.3 if predictable EMI profile and absence of Burst Mode ripple are required - but expect higher no-load current than LTC3240EDC-3.3#TRMPBF |
| LTC3443 | Synchronous buck-boost architecture; 96% peak efficiency; 10-lead DFN; requires inductor | Higher current capability (600mA) and wider VIN range (2.4V–5.5V), but larger solution size and inductor cost | Choose LTC3443 only when >150mA continuous output or >85% efficiency at mid-load is mandatory - not a drop-in replacement due to topology and pinout differences |
Compared with LTC3204B-3.3, the LTC3240EDC-3.3#TRMPBF delivers superior light-load efficiency via Burst Mode and lower quiescent current, while LTC3443 offers higher power and efficiency at the cost of inductor dependency and larger footprint - making LTC3240EDC-3.3#TRMPBF optimal for space- and battery-life-constrained 150mA applications.
Availability
LTC3240EDC-3.3#TRMPBF is available at Aetrix Electronics and suitable for handheld camera I/O supplies, PC card logic power, and wireless sensor node core supplies requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.
Supply support for LTC3240EDC-3.3#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 precision analog and power management portfolio with rigorous process control and automotive-grade reliability testing.
The LTC3240EDC-3.3#TRMPBF belongs to Linear's legacy micropower charge pump family, designed specifically for battery-powered portable electronics needing compact, capacitor-only DC/DC conversion without inductors.
FAQ
What is the minimum input voltage required for the LTC3240EDC-3.3#TRMPBF to regulate 3.3V output?
The LTC3240EDC-3.3#TRMPBF maintains regulation down to 1.8V input in step-up (charge pump) mode. Below VIN = 3.4V, it automatically switches from LDO to 1.2MHz doubling charge pump operation - enabling full 3.3V output functionality even with deeply discharged 2-cell alkaline or NiMH batteries.
Does the LTC3240EDC-3.3#TRMPBF require an inductor in its application circuit?
No, the LTC3240EDC-3.3#TRMPBF is a capacitor-based charge pump converter and requires no inductor. Its design uses only three external ceramic capacitors: 1µF input (CIN), 1µF flying (CFLY), and 4.7µF output (COUT) - simplifying layout and reducing EMI compared to inductive DC/DC topologies.
How does the LTC3240EDC-3.3#TRMPBF handle thermal overload conditions?
The LTC3240EDC-3.3#TRMPBF includes thermal shutdown that disables output when junction temperature exceeds ~160°C. It automatically recovers when temperature falls to ~150°C, cycling indefinitely without damage. For continuous operation, keep TJ ≤ 125°C using the exposed pad soldered to a PCB ground plane per the recommended layout.
Can the LTC3240EDC-3.3#TRMPBF be used with tantalum or aluminum electrolytic capacitors?
No - tantalum and aluminum electrolytics are explicitly discouraged due to high ESR, which degrades loop stability, increases output ripple, and risks oscillation. The LTC3240EDC-3.3#TRMPBF requires low-ESR (<0.1Ω) ceramic capacitors (X5R/X7R dielectric) for CIN, COUT, and CFLY to ensure stability, low noise, and reliable Burst Mode operation.
What is the purpose of the exposed pad (Pin 7) on the LTC3240EDC-3.3#TRMPBF DFN package?
The exposed pad (Pin 7) on the LTC3240EDC-3.3#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 safe operation at maximum load - failure to do so results in excessive junction temperature and premature thermal shutdown.
LTC3240EDC-3.3#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):
- 3.3V
- 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-3.3#TRMPBF FAQ
1.How can I place an order for LTC3240EDC-3.3#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3240EDC-3.3#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-3.3#TRMPBF reliable?
The price and inventory of LTC3240EDC-3.3#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-3.3#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3240EDC-3.3#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3240EDC-3.3#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3240EDC-3.3#TRMPBF?
LTC3240EDC-3.3#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3240EDC-3.3#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-3.3#TRMPBF?
For technical support, including LTC3240EDC-3.3#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3240EDC-3.3#TRMPBF requirements.
6.How does Aetrix verify that LTC3240EDC-3.3#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3240EDC-3.3#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-3.3#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3240EDC-3.3#TRMPBF?
All LTC3240EDC-3.3#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3240EDC-3.3#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-3.3#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3240EDC-3.3#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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