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Analog Devices Inc. LTC3240EDC-3.3#TRPBF
- Part No.:
- LTC3240EDC-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3240EDC-3.3#TRPBF.pdf
- Description:
- IC REG CHRG PUMP 3.3V 150MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:339
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Product details
Overview
LTC3240EDC-3.3#TRPBF 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 above VOUT + 100mV and auto-switches to 1.2MHz constant-frequency charge pump mode below that threshold. Its 65µA no-load quiescent current, <1µA shutdown current, and built-in soft-start make it suitable for battery-powered handheld devices requiring stable, low-noise 3.3V rail generation.
For engineers reviewing the LTC3240EDC-3.3#TRPBF datasheet, LTC3240EDC-3.3#TRPBF pinout, LTC3240EDC-3.3#TRPBF application, or LTC3240EDC-3.3#TRPBF equivalent, key selection criteria include automatic VIN-dependent mode switching, output ripple ≤20mVP-P at 100mA, thermal/short-circuit protection, and compatibility with only three external 0603 ceramic capacitors in space-constrained designs.
Technical Context
The LTC3240EDC-3.3#TRPBF integrates a dual-mode control architecture: LDO operation when VIN ≥ VOUT + 100mV, and voltage-doubling charge pump operation when VIN falls below that threshold. Regulation is achieved via internal resistor-divider feedback and current-modulated pump strength.
In charge pump mode, it employs a 1.2MHz nonoverlapping oscillator driving C+ and C− terminals to charge and stack the flying capacitor. Burst Mode® activates automatically below ~15mA load to reduce switching losses, dropping quiescent current to 65µA while maintaining regulation.
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-cell Li-ion, 2–3 alkaline/NiMH, and wide-battery-voltage systems |
| Max Output Current | 150mA in step-down (LDO) mode; 100mA sustained in step-up (charge pump) mode |
| No-Load Quiescent Current | 65µA typical - enables multi-day standby in portable devices |
| Shutdown Current | <1µA - isolates load from input and minimizes battery drain during sleep |
| Switching Frequency | 1.2MHz fixed in step-up mode - allows use of tiny 1µF ceramic flying capacitor |
| Output Ripple | ≤20mVP-P at 100mA load - meets noise-sensitive analog and RF supply requirements |
Pinout & Package
Package: 6-lead (2mm × 2mm) plastic DFN with exposed thermal pad (Pin 7 = GND). Requires soldering of exposed pad to PCB ground plane for θJA = 80°C/W thermal performance and EMI suppression.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Power and signal reference ground | Must connect to low-impedance ground plane; primary return path for all internal currents |
| VIN (Pin 2) | Main input supply | 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 with <0.1Ω ESR for stability |
| C+ (Pin 4) | Flying capacitor positive terminal | Connects to high-side plate of 1µF ceramic flying capacitor; switches between VIN and VOUT |
| C− (Pin 5) | Flying capacitor negative terminal | Connects to low-side plate of flying capacitor; referenced to GND during charge phase |
| SHDN (Pin 6) | Active-low enable control | CMOS input with VIH = 1.2V, VIL = 0.4V; must be driven - floating prohibited |
Key Features
| Feature | Design Value |
|---|---|
| Automatic step-up/step-down mode switching | Seamlessly transitions 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 caps and avoids input brownout |
| Integrated short-circuit and thermal protection | Current limits to 270–450mA depending on mode; cycles in/out of thermal shutdown at ~160°C without latch-up |
| Ultralow shutdown disconnect | Shuts down all circuitry and disconnects VOUT from VIN - ensures zero load leakage during system sleep |
| Minimal external component count | Requires only three 0603 ceramic capacitors (CIN, COUT, CFLY) - reduces BOM cost and board area vs inductor-based solutions |
Applications
| Portable Medical Sensors | Industrial Handheld Terminals |
|---|---|
Use Scenario: Powering low-power analog front-ends and BLE transceivers in battery-operated glucose meters and pulse oximeters. IC Role / Device Role / Timing Role: Primary 3.3V supply IC generating clean, regulated rail from aging 2-cell alkaline batteries (1.8V–3.2V). Use Value: Maintains regulation down to 1.8V input while drawing only 65µA quiescent current - extends battery life beyond 12 months in intermittent-use devices. |
Use Scenario: Supplying microcontroller I/O banks and display drivers in ruggedized warehouse scanners operating across wide ambient temperatures. IC Role / Device Role / Timing Role: Dual-mode DC/DC converter providing stable 3.3V rail from 3.0V–4.2V Li-ion packs under varying load transients. Use Value: Auto-switching between LDO and charge pump modes ensures >87% efficiency at full load and <1µA shutdown current during idle - critical for 24/7 duty cycle reliability. |
| Wireless Camera Modules | IoT Edge Node Controllers |
Use Scenario: Delivering low-noise 3.3V power to CMOS image sensors and Wi-Fi SoCs in compact security cameras powered by single-cell Li-ion. IC Role / Device Role / Timing Role: Compact charge pump regulator replacing inductor-based buck-boost to meet strict EMI and height constraints (<0.8mm). Use Value: 20mVP-P output ripple and 1.2MHz switching frequency enable direct coupling to sensitive analog sensor rails without additional LC filtering. |
Use Scenario: Providing always-on 3.3V supply for real-time clock, secure element, and wake-up controller in battery-backed smart meter modules. IC Role / Device Role / Timing Role: Ultra-low-IQ DC/DC converter sustaining backup power during main supply failure or deep-sleep states. Use Value: 65µA no-load IQ and guaranteed operation down to –40°C ensure reliable RTC timekeeping and tamper detection even after years of field deployment. |
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 |
|---|---|---|---|
| LTC3204-3.3 | Same 2mm×2mm DFN package; 1.8V–4.5V input; no Burst Mode; higher IQ (48µA) | Lower noise in fixed-frequency operation; less efficient at light loads due to absence of Burst Mode | Select when deterministic 1.5MHz switching is required for EMI filtering, and light-load efficiency is secondary |
| LTC3443 | Synchronous buck-boost; 2.4V–5.5V input; 96% peak efficiency; 10-lead DFN; requires inductor | Higher output current (600mA); wider VIN range; inductor-based - larger footprint and potential EMI concerns | Select when >150mA continuous output or tighter line/load regulation is needed, and board space permits inductor placement |
Compared with LTC3240EDC-3.3#TRPBF, LTC3204-3.3 trades light-load efficiency for deterministic noise spectrum, while LTC3443 delivers higher current and efficiency at the cost of added inductors and layout complexity - making LTC3240EDC-3.3#TRPBF optimal for ultra-compact, battery-sensitive 150mA applications.
Availability
LTC3240EDC-3.3#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, industrial handheld terminals, and wireless camera modules requiring stable component supply with guaranteed long-term manufacturability.
Supply support for LTC3240EDC-3.3#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 its precision analog and power management portfolio. Linear pioneered high-efficiency, ultralow-noise DC/DC conversion for portable electronics.
The LTC3240 series was designed specifically for space- and battery-constrained handheld devices needing regulated 2.5V/3.3V rails from single- or dual-cell sources - emphasizing minimal external components, automatic mode adaptation, and robust protection.
FAQ
What is the minimum input voltage required for the LTC3240EDC-3.3#TRPBF to regulate 3.3V output?
The LTC3240EDC-3.3#TRPBF regulates 3.3V output down to a minimum input voltage of 1.8V. Below VIN = VOUT + 100mV (~3.4V), it automatically enters step-up (charge pump) mode. At 1.8V input, it delivers up to 40mA in step-up mode per datasheet Figure G10, and up to 150mA when VIN ≥ 2.5V in step-down mode.
Does the LTC3240EDC-3.3#TRPBF require an inductor?
No, the LTC3240EDC-3.3#TRPBF is a capacitor-based charge pump DC/DC converter and does not require an inductor. It uses only three external ceramic capacitors: 1µF input (CIN), 1µF flying (CFLY), and 4.7µF output (COUT). This eliminates magnetic components, reduces EMI, and enables ultra-thin designs.
How does the LTC3240EDC-3.3#TRPBF handle thermal overload?
The LTC3240EDC-3.3#TRPBF features thermal shutdown that activates at ~160°C junction temperature. It cycles on/off indefinitely without latch-up until the fault is removed. For continuous operation, design must keep TJ ≤ 125°C using the exposed pad soldered to a ground plane - achieving θJA = 80°C/W per datasheet Note 4.
Can the LTC3240EDC-3.3#TRPBF be used with tantalum or aluminum electrolytic capacitors?
No - tantalum and aluminum electrolytic capacitors are explicitly discouraged for CIN, COUT, and CFLY in the LTC3240EDC-3.3#TRPBF datasheet. Their high ESR degrades loop stability, increases ripple, and risks oscillation. Only low-ESR ceramic capacitors (X5R/X7R, ≤0.1Ω) are recommended to ensure regulation stability and transient response.
What is the purpose of the exposed pad (Pin 7) on the LTC3240EDC-3.3#TRPBF DFN package?
The exposed pad (Pin 7) on the LTC3240EDC-3.3#TRPBF 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, ensure proper EMI suppression, and provide low-impedance return paths for high-frequency switching currents.
LTC3240EDC-3.3#TRPBF 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#TRPBF FAQ
1.How can I place an order for LTC3240EDC-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3240EDC-3.3#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 LTC3240EDC-3.3#TRPBF reliable?
The price and inventory of LTC3240EDC-3.3#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3240EDC-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3240EDC-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3240EDC-3.3#TRPBF?
LTC3240EDC-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3240EDC-3.3#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 LTC3240EDC-3.3#TRPBF?
For technical support, including LTC3240EDC-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3240EDC-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC3240EDC-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3240EDC-3.3#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 LTC3240EDC-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3240EDC-3.3#TRPBF?
All LTC3240EDC-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3240EDC-3.3#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 LTC3240EDC-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC3240EDC-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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