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Analog Devices Inc. LTC1514IS8-3.3#PBF
- Part No.:
- LTC1514IS8-3.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1514IS8-3.3#PBF.pdf
- Description:
- IC REG CHARGE PUMP 3.3V 50MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:130
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Product details
Overview
LTC1514IS8-3.3#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% output regulation, 650kHz switching, and integrated low-battery comparator - used in battery-backed smart card readers and handheld instrumentation.
For engineers reviewing the LTC1514IS8-3.3#PBF datasheet, LTC1514IS8-3.3#PBF pinout, LTC1514IS8-3.3#PBF application, or LTC1514IS8-3.3#PBF equivalent, key selection criteria include input voltage range compatibility, shutdown current (10µA), soft-start timing (4ms), low-battery detection threshold (1.145V), and SO-8 thermal performance (θJA = 110°C/W).
Technical Context
The LTC1514IS8-3.3#PBF employs a dual-mode charge pump architecture that automatically selects step-up (voltage doubler) or step-down (gated switch) operation based on VIN–VOUT differential, enabling stable 3.3V regulation across 2V–8V input while limiting inrush current via dynamic output impedance adjustment.
Its internal 1.145V reference drives an uncommitted open-drain comparator (LBI/LBO) that remains active during shutdown, supporting battery protection schemes; regulation uses hysteresis-based burst-mode control, producing ~100mVP-P ripple at full load with 10µF COUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±4% over 2V–8V input and 0–50mA load - ensures compatibility with 3.3V logic without external feedback. |
| Input Voltage Range | 2.0V to 8.0V - supports single-cell Li-ion (2.7–4.2V), 2–3 alkaline/NiCd cells, and wide-supply industrial rails. |
| Max Output Current | 50mA continuous - sufficient for low-power microcontrollers, EEPROMs, and sensor interfaces in portable systems. |
| Quiescent Current | 60µA typical - extends battery life in always-on monitoring applications such as smart card power management. |
| Shutdown Current | 10µA maximum at VIN ≤ 5V - enables ultra-low standby power in battery backup supplies. |
| Switching Frequency | 650kHz nominal - allows use of small 0.22µF flying capacitor and minimizes EMI in space-constrained layouts. |
| Low-Battery Threshold | 1.145V ±3% (LBI trip point) - programmable via external resistor divider to monitor battery voltage down to 1.1V with hysteresis. |
Pinout & Package
Package: 8-lead plastic SO (SO-8, narrow 0.150", θJA = 110°C/W). Pinout validated per Linear Technology LTC1514-3.3 datasheet Figure "TOP VIEW S8 PACKAGE".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (Pin 1) | Logic-controlled shutdown input | Active-low enable; pulls regulator into 10µA shutdown state; must be tied to VIN if unused to prevent floating. |
| LBO (Pin 2) | Open-drain low-battery comparator output | Sinks current when LBI < 1.145V; requires external pull-up (50k–1MΩ) for interfacing with µC GPIO or reset logic. |
| LBI (Pin 3) | Low-battery comparator input | High-impedance (±50nA) node for sensing battery voltage; comparator remains active in shutdown mode. |
| GND (Pin 4) | Analog and power ground reference | Must connect to low-impedance ground plane to minimize noise coupling into regulation and comparator paths. |
| C1– (Pin 5) | Flying capacitor negative terminal | Connects to 0.22µF ceramic flying capacitor; critical path for charge transfer - keep trace short and low-inductance. |
| C1+ (Pin 6) | Flying capacitor positive terminal | Completes flying cap loop; paired with C1– to implement bidirectional charge pump operation. |
| VIN (Pin 7) | Main input supply connection | Accepts 2–8V; requires ≥10µF low-ESR bypass capacitor placed adjacent to pin to suppress input ripple and inrush transients. |
| VOUT (Pin 8) | Regulated 3.3V output | Delivers up to 50mA; requires ≥10µF low-ESR output capacitor; ripple reduced to <100mVP-P with proper COUT selection. |
Key Features
| Feature | Design Value |
|---|---|
| Step-up/step-down charge pump | Automatically switches between voltage-doubling and gated-switch modes to maintain 3.3V regulation across 2V–8V input - eliminates need for separate buck/boost ICs. |
| Integrated low-battery comparator | 1.145V reference with open-drain LBO output active in shutdown - enables autonomous battery cutoff without external supervisor IC. |
| Soft-start circuitry | 4ms typical VOUT ramp time from 0V to 3.3V - limits inrush current to ~12.5mA with 10µF COUT, preventing input rail collapse during power-up. |
| Thermal & short-circuit protection | Shuts down at ~150°C junction temperature and limits short-circuit current to 12mA typ - ensures robustness in unattended embedded deployments. |
| Minimal external components | Requires only three capacitors (CIN, COUT, CFLY) - reduces BOM count and PCB area vs inductor-based converters. |
Applications
| Smart Card Readers | Battery Backup Supplies |
|---|---|
Use Scenario: Powering ISO 7816-compliant smart cards from single-cell alkaline or NiCd batteries during insertion and transaction cycles. IC Role / Device Role / Timing Role: Primary regulated 3.3V supply with autoswitching between battery and wall adapter; LBO triggers card reset on low-voltage detection. Use Value: Enables >1000-card read cycles per battery set using only 60µA quiescent current and 10µF/0.22µF passive components. | Use Scenario: Maintaining volatile memory or real-time clock (RTC) power during main supply failure in industrial controllers. IC Role / Device Role / Timing Role: Standby DC/DC converter activated by SHDN signal from system controller; LBI monitors backup battery health continuously. Use Value: Delivers clean 3.3V at 15mA with <100mV ripple and zero reverse current leakage - prevents battery drain when main supply is present. |
| Handheld Test Instruments | Local Power Supplies |
Use Scenario: Providing isolated 3.3V rail for ADC front-end and microcontroller in portable multimeters or data loggers. IC Role / Device Role / Timing Role: Main system regulator with input voltage flexibility (2–8V) to accommodate varying battery chemistries and charge states. Use Value: Maintains ±4% regulation across full battery discharge curve (e.g., 3.0V–1.0V per cell), eliminating need for battery gauge or firmware compensation. | Use Scenario: Generating local 3.3V supply from higher-voltage system rails (e.g., 5V or 12V) in FPGA I/O banks or sensor interface modules. IC Role / Device Role / Timing Role: Compact, inductorless point-of-load regulator replacing linear regulators where efficiency >80% is required. Use Value: Achieves >85% efficiency at 10mA load from 5V input - reduces thermal load vs LDOs while occupying <15mm² PCB area. |
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 |
|---|---|---|---|
| LTC1514CS8-3.3 | Same electrical specs but rated for 0°C to 70°C commercial temperature range vs –40°C to 85°C industrial grade. | Not suitable for extended-temperature environments like automotive or outdoor industrial equipment. | Select LTC1514IS8-3.3#PBF for designs requiring guaranteed operation below 0°C or above 70°C. |
| LTC1515IS8-3.3 | Includes power-on reset (POR) output and adjustable output version; otherwise identical topology, pinout, and thermal specs. | Used where system-level reset coordination is needed - adds POR functionality not present in LTC1514IS8-3.3#PBF. | Choose LTC1515IS8-3.3 only if POR signal is required; otherwise LTC1514IS8-3.3#PBF offers lower cost and same core regulation. |
Compared with LTC1514CS8-3.3, the LTC1514IS8-3.3#PBF provides guaranteed operation across –40°C to 85°C, making it suitable for harsh environments; versus LTC1515IS8-3.3, it omits POR but retains identical regulation accuracy, efficiency, and footprint - ideal for cost-sensitive, temperature-critical applications without reset signaling needs.
Availability
LTC1514IS8-3.3#PBF is available at Aetrix Electronics and suitable for battery-operated equipment, smart card readers, and handheld instruments requiring stable component supply, long-term lifecycle support, and industrial-grade temperature performance.
Supply support for LTC1514IS8-3.3#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 technical and manufacturing continuity for legacy Linear products including the LTC series.
The LTC1514IS8-3.3#PBF belongs to Linear's micropower switched-capacitor DC/DC converter family, designed specifically for low-noise, inductorless power conversion in space- and battery-constrained portable and industrial systems.
FAQ
What is the operating temperature range for the LTC1514IS8-3.3#PBF?
The LTC1514IS8-3.3#PBF is specified for industrial temperature operation from –40°C to +85°C. This range is confirmed in the Absolute Maximum Ratings table and applies to all electrical characteristics unless otherwise noted. The "I" suffix in the part number explicitly denotes industrial grade, distinguishing it from the commercial-grade LTC1514CS8-3.3 (0°C to 70°C). Thermal shutdown activates at ~150°C junction temperature.
Does the LTC1514IS8-3.3#PBF require an inductor?
No, the LTC1514IS8-3.3#PBF is a switched-capacitor (charge pump) DC/DC converter and does not require an inductor. It uses only three external capacitors: a 0.22µF flying capacitor (C1), and ≥10µF input and output capacitors (CIN, COUT). This eliminates magnetic components, simplifies layout, and avoids inductor-related EMI and saturation issues common in inductive boost/buck topologies.
Can the LTC1514IS8-3.3#PBF operate with input voltages below 2.0V?
No - the absolute minimum operating input voltage for the LTC1514IS8-3.3#PBF is 2.0V, as stated in the Electrical Characteristics table under "VIN Operating Voltage". Operation below 2.0V is outside specification and may result in loss of regulation, increased ripple, or failure to start. For sub-2V battery applications, consider alternative solutions such as the LTC3526L or discrete low-VGS MOSFET-based charge pumps.
How does the low-battery comparator function in shutdown mode for the LTC1514IS8-3.3#PBF?
The low-battery comparator in the LTC1514IS8-3.3#PBF remains fully active during shutdown: the internal 1.145V reference and comparator circuitry continue operating, allowing LBI monitoring and LBO assertion even when the main regulator is disabled. This enables battery protection schemes that cut off downstream loads before deep discharge - critical for preserving rechargeable battery cycle life in backup applications.
What is the typical output voltage ripple of the LTC1514IS8-3.3#PBF under full load?
The typical output voltage ripple of the LTC1514IS8-3.3#PBF is 100mVP-P at full 50mA load with VIN < 8V and a 10µF low-ESR output capacitor, as specified in the Electrical Characteristics table. Ripple increases with higher VIN (e.g., >8V) or smaller COUT; using 22µF or greater COUT reduces ripple to <100mVP-P across the full input range. Ripple is inherent to the hysteresis-based burst-mode regulation.
LTC1514IS8-3.3#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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1514IS8-3.3#PBF FAQ
1.How can I place an order for LTC1514IS8-3.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1514IS8-3.3#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 LTC1514IS8-3.3#PBF reliable?
The price and inventory of LTC1514IS8-3.3#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1514IS8-3.3#PBF is usually 5 days.
3.What payment methods are accepted for LTC1514IS8-3.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1514IS8-3.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1514IS8-3.3#PBF?
LTC1514IS8-3.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1514IS8-3.3#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 LTC1514IS8-3.3#PBF?
For technical support, including LTC1514IS8-3.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1514IS8-3.3#PBF requirements.
6.How does Aetrix verify that LTC1514IS8-3.3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1514IS8-3.3#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 LTC1514IS8-3.3#PBF meets industry standards.
7.What is the process for return or replacement of LTC1514IS8-3.3#PBF?
All LTC1514IS8-3.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1514IS8-3.3#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 LTC1514IS8-3.3#PBF part is unused and in its original packaging.
Return procedure for LTC1514IS8-3.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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