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Analog Devices Inc. LTC1514CS8-3.3#PBF
- Part No.:
- LTC1514CS8-3.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1514CS8-3.3#PBF.pdf
- Description:
- IC REG CHARGE PUMP 3.3V 50MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
LTC1514CS8-3.3#PBF from Analog Devices (formerly Linear Technology) is a micropower switched-capacitor DC/DC converter that regulates a fixed 3.3V output via step-up or step-down operation across a 2V–8V input range, delivering up to 50mA with ±4% regulation, 650kHz switching, and integrated low-battery comparator - used in battery-powered instrumentation and smart card readers.
For engineers reviewing the LTC1514CS8-3.3#PBF datasheet, LTC1514CS8-3.3#PBF pinout, LTC1514CS8-3.3#PBF application, or LTC1514CS8-3.3#PBF equivalent, key selection criteria include input voltage flexibility (2V–8V), shutdown current (10µA), soft-start timing (4ms), low-battery detection threshold (1.145V), and SO-8 package compatibility for space-constrained portable designs.
Technical Context
The LTC1514CS8-3.3#PBF employs a charge-pump architecture with automatic mode switching: it operates as a voltage doubler in step-up mode (VIN < VOUT) and as a gated switch in step-down mode (VIN > VOUT), maintaining regulation across wide VIN–VOUT differentials. Internal voltage sensing dynamically adjusts effective output impedance to suppress inrush current.
Its uncommitted open-drain low-battery comparator remains active during shutdown, referenced to a 1.145V internal bandgap (±3%), enabling battery protection without external bias. Regulation relies on hysteresis-based burst-mode control, producing ~100mVP-P output ripple - an inherent feature required for stable feedback operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±4% over 2V–8V input and 0–50mA load - enables direct replacement of LDOs where efficiency >75% is critical. |
| Input Voltage Range | 2.0V to 8.0V - supports single-cell LiFePO₄, two-cell NiCd/NiMH, or three-cell alkaline without external regulators. |
| Max Output Current | 50mA at VIN ≥3V - sufficient for microcontroller peripherals, EEPROM, and RF transceivers in ultra-low-power systems. |
| Quiescent Current | 60µA typical at VIN ≤5V - extends battery life in always-on monitoring nodes with infrequent wake-ups. |
| Shutdown Current | 10µA maximum at VIN ≤5V - ensures multi-year shelf life in sealed battery-backed devices. |
| Switching Frequency | 650kHz typical - allows use of small 0.22µF ceramic flying capacitor and minimizes EMI in sensitive analog sections. |
| Low-Battery Threshold | 1.145V ±3% on LBI pin - permits accurate end-of-discharge detection for 3.3V logic rails using simple resistor dividers. |
Pinout & Package
Package: 8-lead plastic SO (SO-8, narrow 0.150"), 110°C/W thermal resistance, RoHS-compliant (Pb-free #PBF suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SHDN | Active-low shutdown control input | Logic-compatible with 3V systems; must be tied to VIN if unused - prevents floating-induced erratic enable behavior. |
| 2 - LBO | Open-drain low-battery comparator output | Sinks current when LBI < 1.145V; requires external pull-up (50kΩ–1MΩ) to interface with µC GPIO or reset logic. |
| 3 - LBI | Low-battery comparator input | High-impedance node (±50nA bias); connects to resistive divider from battery - remains active in shutdown for deep-discharge prevention. |
| 4 - GND | Power and signal reference ground | Must connect directly to low-impedance ground plane to minimize noise coupling into charge-pump switching paths. |
| 5 - C1– | Flying capacitor negative terminal | Connects to 0.22µF ceramic capacitor - forms half of charge-transfer path; layout symmetry critical for ripple suppression. |
| 6 - C1+ | Flying capacitor positive terminal | Paired with C1–; routing must be short and matched to C1– to avoid EMI and efficiency loss from parasitic inductance. |
| 7 - VIN | Main input supply connection | Accepts 2V–8V; requires ≥10µF low-ESR bypass capacitor placed adjacent to pin to stabilize input during charge-pump bursts. |
| 8 - VOUT | Regulated 3.3V output | Delivers up to 50mA; requires ≥10µF low-ESR output capacitor - 22µF recommended for VIN >8V to hold ripple ≤100mVP-P. |
Key Features
| Feature | Design Value |
|---|---|
| Step-up/step-down charge pump | Single IC replaces separate boost + LDO stages - reduces BOM count and PCB area in dual-supply sensor nodes. |
| Integrated low-battery comparator | Eliminates need for external supervisor IC - saves 2–3 passives and enables battery-aware firmware without added latency. |
| Soft-start circuitry | 4ms typical VOUT ramp time limits inrush to ≤12.5mA (with 10µF COUT) - prevents brown-out in shared battery rails. |
| Short-circuit & thermal protection | Indefinite short-to-GND survival and 150°C thermal shutdown - ensures robustness in field-deployed handheld equipment. |
| Only three external capacitors | 0.22µF flying cap + 10µF input/output caps - simplifies layout validation and accelerates prototyping vs. inductor-based converters. |
Applications
| Battery-Operated Handheld Instruments | Smart Card Readers |
|---|---|
Use Scenario: Portable multimeters and data loggers powered by two AA cells with variable discharge profiles (1.8V–3.2V). IC Role / Device Role / Timing Role: Primary 3.3V power rail generator that adapts to declining battery voltage while maintaining MCU and ADC performance. Use Value: Enables continuous operation down to 2.0V input - extending usable battery life by 25% versus fixed-step-up converters. | Use Scenario: Contactless EMV payment terminals using ISO/IEC 14443-A/B readers requiring stable 3.3V for RF front-end and secure element. IC Role / Device Role / Timing Role: Local regulated supply decoupled from noisy USB or wall-adapter inputs - isolates analog RF section from digital switching noise. Use Value: 100mVP-P ripple and 650kHz frequency allow compact filtering - meeting EMI Class B limits without ferrite beads. |
| Local Power Supplies for Microcontrollers | Battery Backup Supplies |
Use Scenario: Industrial IoT edge nodes with ARM Cortex-M0+ MCU, BLE radio, and sensors - powered by primary Li-ion and backed by coin cell. IC Role / Device Role / Timing Role: Main 3.3V supply during normal operation; automatically transitions to backup source via external diode OR-ing when main fails. Use Value: 10µA shutdown current preserves coin-cell capacity for >5 years - ensuring RTC and SRAM retention during extended outages. | Use Scenario: Point-of-sale terminals with real-time clock and nonvolatile memory requiring uninterrupted 3.3V during AC power loss. IC Role / Device Role / Timing Role: Secondary regulated rail activated only when main supply drops - prevents reverse current flow into depleted backup battery. Use Value: Shutdown disconnects load from VIN - eliminating standby drain and enabling true zero-current backup mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1514IS8-3.3 | Same electrical specs but rated for –40°C to +85°C industrial temperature range vs. 0°C to +70°C commercial grade. | Suitable for outdoor or automotive-adjacent deployments where ambient exceeds 70°C. | Select LTC1514IS8-3.3 when operating junction temperature may exceed 70°C - no PCB changes required. |
| LTC1515CS8-3.3 | Includes power-on reset (POR) output and adjustable output option; otherwise identical pinout, regulation, and efficiency. | Required when system-level reset sequencing or programmable VOUT (e.g., 2.5V/3.3V/5V) is needed. | Choose LTC1515CS8-3.3 only if POR signal or ADJ capability is mandatory - adds functionality but same footprint. |
Compared with LTC1514CS8-3.3#PBF, the LTC1514IS8-3.3 offers extended temperature reliability without design modification, while the LTC1515CS8-3.3 adds system-level reset control at the cost of slightly higher quiescent current (75µA vs. 60µA) - both retain identical SO-8 layout and external component requirements.
Availability
LTC1514CS8-3.3#PBF is available at Aetrix Electronics and suitable for battery-operated handheld instruments, smart card readers, local microcontroller power supplies, battery backup supplies, and low-power sensor nodes requiring stable component supply across commercial temperature grades.
Supply support for LTC1514CS8-3.3#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 acquired Linear Technology in 2017 and maintains full product support, datasheets, and application notes for legacy Linear parts including the LTC series.
The LTC1514 family was designed specifically for ultra-low-power, space-constrained battery systems needing efficient 3.3V or 5V regulation without inductors - targeting portable medical, security, and industrial edge devices.
FAQ
What is the minimum input voltage required for LTC1514CS8-3.3#PBF to regulate 3.3V output?
The LTC1514CS8-3.3#PBF maintains regulation down to 2.0V input across its full operating temperature range. At VIN = 2.0V, it operates in step-up mode to deliver 3.3V ±4% with up to 15mA load; output current capability increases to 50mA when VIN ≥ 3.0V. This 2V start-up threshold supports single-cell LiFePO₄ and deeply discharged NiMH batteries.
Does LTC1514CS8-3.3#PBF require an inductor in its application circuit?
No, the LTC1514CS8-3.3#PBF uses a switched-capacitor (charge-pump) topology and requires only three external capacitors: a 0.22µF flying capacitor (C1) and two ≥10µF low-ESR bypass capacitors (CIN and COUT). This eliminates magnetic components, reducing EMI, board area, and cost compared to inductor-based DC/DC converters.
How does the low-battery comparator in LTC1514CS8-3.3#PBF function during shutdown?
The low-battery comparator in LTC1514CS8-3.3#PBF remains fully active during shutdown, continuously monitoring the LBI pin against its 1.145V internal reference. When LBI falls below this threshold, LBO pulls low (open-drain), enabling battery protection circuits to disable downstream loads - all while consuming only 10µA total shutdown current.
What is the purpose of the soft-start feature in LTC1514CS8-3.3#PBF?
The soft-start feature in LTC1514CS8-3.3#PBF limits inrush current during power-up and wake-from-shutdown by controlling the rate of VOUT voltage rise, achieving a typical 4ms ramp time to 3.3V with a 10µF output capacitor. This prevents input rail collapse in systems with high-source-impedance batteries or shared power supplies.
Can LTC1514CS8-3.3#PBF be used with input voltages above 8V?
No - the absolute maximum VIN rating for LTC1514CS8-3.3#PBF is 12V, but its specified operating range is limited to 2.0V–8.0V per datasheet Electrical Characteristics. Operation above 8V violates guaranteed regulation performance and may increase output ripple beyond 100mVP-P; for >8V inputs, consider the LTC1514-5 variant (2.7V–10V range) or alternative regulators.
LTC1514CS8-3.3#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 8V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 50mA
- Frequency - Switching:
- 650kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1514CS8-3.3#PBF FAQ
1.How can I place an order for LTC1514CS8-3.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1514CS8-3.3#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 LTC1514CS8-3.3#PBF reliable?
The price and inventory of LTC1514CS8-3.3#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1514CS8-3.3#PBF is usually 5 days.
3.What payment methods are accepted for LTC1514CS8-3.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1514CS8-3.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1514CS8-3.3#PBF?
LTC1514CS8-3.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1514CS8-3.3#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 LTC1514CS8-3.3#PBF?
For technical support, including LTC1514CS8-3.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1514CS8-3.3#PBF requirements.
6.How does Aetrix verify that LTC1514CS8-3.3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1514CS8-3.3#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 LTC1514CS8-3.3#PBF meets industry standards.
7.What is the process for return or replacement of LTC1514CS8-3.3#PBF?
All LTC1514CS8-3.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1514CS8-3.3#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 LTC1514CS8-3.3#PBF part is unused and in its original packaging.
Return procedure for LTC1514CS8-3.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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