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Analog Devices Inc. LTC1514CS8-3.3#TRPBF
- Part No.:
- LTC1514CS8-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1514CS8-3.3#TRPBF.pdf
- Description:
- IC REG CHARGE PUMP 3.3V 50MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,609
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Product details
Overview
LTC1514CS8-3.3#TRPBF from Analog Devices (formerly Linear Technology) is a micropower switched-capacitor DC/DC converter that provides regulated 3.3V output via step-up or step-down operation across 2V–8V input, delivering up to 50mA with ±4% regulation, 650kHz switching, and integrated low-battery comparator - used in battery-backed smart card readers and handheld instrumentation.
For engineers reviewing the LTC1514CS8-3.3#TRPBF datasheet, LTC1514CS8-3.3#TRPBF pinout, LTC1514CS8-3.3#TRPBF application, or LTC1514CS8-3.3#TRPBF equivalent, key selection criteria include input voltage range compatibility (2V–8V), shutdown current (10µA), soft-start timing (4ms), low-battery detection threshold (1.145V), and SO-8 package thermal resistance (110°C/W).
Technical Context
The LTC1514CS8-3.3#TRPBF 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 regulation across a wide input range without external mode control. Its internal 1.145V reference drives an open-drain comparator (LBO) that remains active during shutdown.
Regulation relies on hysteresis-based burst-mode control: the internal comparator compares a resistor-divided VOUT against the 1.145V reference, enabling the 650kHz oscillator only when output droop exceeds hysteresis - yielding 100mVP-P ripple at full load and 60µA typical operating current. Soft-start limits inrush by controlling VOUT slew rate to ~12.5mA effective charging current into 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 stable logic supply for 3.3V microcontrollers and peripherals. |
| Input Voltage Range | 2.0V to 8.0V - supports single-cell LiFePO₄ (2.5–3.6V), 2–3 alkaline/NiCd cells (2.0–4.5V), and boosted intermediate rails. |
| Max Output Current | 50mA continuous - sufficient for low-power MCU cores, sensors, and RF transceivers in portable devices. |
| Operating Current | 60µA typical at VIN ≤ 5V - extends battery life in always-on monitoring applications with infrequent wake-ups. |
| Shutdown Current | 10µA maximum at VIN ≤ 5V - enables multi-year shelf life in battery-backed real-time clocks and memory retainers. |
| Switching Frequency | 650kHz nominal - allows use of small 0.22µF ceramic flying capacitor and minimizes EMI in noise-sensitive analog sections. |
| Low-Battery Threshold | 1.145V ±3% on LBI pin - programmable via external resistor divider to monitor battery voltage down to 2.0V with 1% hysteresis. |
Pinout & Package
Package: 8-lead plastic SO (SO-8, narrow 0.150", JEDEC MS-012AC), 110°C/W θJA, RoHS-compliant, tape-and-reel (#TRPBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: SHDN | Active-high shutdown control | Logic high ≥1.6V enables regulator; low ≤0.4V disables output and disconnects load from VIN while keeping LBI/LBO active. |
| 2: LBO | Open-drain low-battery output | Sinks current when LBI < 1.145V; requires external pull-up (50kΩ–1MΩ) to interface with µC GPIO or power management ICs. |
| 3: LBI | Low-battery comparator input | High-impedance node (±50nA bias) for sensing battery voltage via resistor divider; comparator stays powered in shutdown. |
| 4: GND | Analog and power ground | Must connect to low-impedance ground plane; separates charge pump return from sensitive analog reference paths. |
| 5: C1– | Flying capacitor negative terminal | Connects to negative side of 0.22µF ceramic flying capacitor; forms charge transfer path in step-up/step-down cycles. |
| 6: C1+ | Flying capacitor positive terminal | Connects to positive side of 0.22µF ceramic flying capacitor; alternates polarity with each 650kHz clock phase. |
| 7: VIN | Input supply rail | Accepts 2V–8V; requires ≥10µF low-ESR bypass capacitor close to pin to suppress input ripple and inrush spikes. |
| 8: VOUT | Regulated 3.3V output | Delivers up to 50mA; requires ≥10µF low-ESR output capacitor; ripple inherently present (100mVP-P) due to burst-mode regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Step-up/step-down architecture | Automatically switches between voltage-doubling (VIN < VOUT) and gated-switch (VIN > VOUT) modes - eliminates need for manual mode selection or external control logic. |
| Integrated low-battery comparator | 1.145V reference with open-drain LBO output active in shutdown - enables battery protection and system-level power sequencing without extra ICs. |
| Soft-start circuitry | 4ms typical VOUT ramp time from 0V to 3.3V - limits inrush current to ~12.5mA into 10µF COUT, preventing brownout of weak input sources. |
| Short-circuit & thermal protection | Indefinite short-to-ground survival with 12mA current limit and 150°C thermal shutdown - ensures robustness in field-deployed equipment. |
| Ultra-low quiescent current | 60µA operating / 10µA shutdown - reduces average current draw in duty-cycled systems (e.g., sensor nodes waking every 10s). |
Applications
| Smart Card Readers | Battery Backup Supplies |
|---|---|
|
Use Scenario: Portable EMV-compliant card readers powered by two AA alkaline cells (2.0–3.2V), requiring stable 3.3V for secure element and contactless interface ICs. IC Role / Device Role / Timing Role: Primary 3.3V power regulator with autoswitching between step-up (2.0–3.2V) and step-down (3.3–3.6V) modes; LBO monitors cell voltage to trigger low-power alert before shutdown. Use Value: Eliminates need for separate LDO or buck-boost IC, reducing BOM count and PCB area while maintaining ±4% regulation across full battery discharge curve. |
Use Scenario: Real-time clock (RTC) backup supply in industrial PLCs, where main 5V rail may fail and supercapacitor or coin cell must sustain VDD for >72 hours. IC Role / Device Role / Timing Role: Standby-regulated 3.3V source that activates only when main rail drops below 2.0V; LBI senses main rail via resistor divider to initiate switchover. Use Value: 10µA shutdown current extends coin cell life to >10 years; SO-8 package allows placement near RTC IC with minimal trace inductance. |
| Handheld Test Instruments | Local Power Supplies |
|
Use Scenario: Battery-powered multimeter with LCD, microcontroller, and analog front-end, operating from 3×AAA (4.5V fresh, 3.0V depleted). IC Role / Device Role / Timing Role: Efficient 3.3V rail generator supporting both step-down (4.5V→3.3V) and step-up (3.0V→3.3V) as battery discharges; soft-start prevents display flicker during power-on. Use Value: 650kHz switching enables compact 0.22µF flying cap and 10µF output cap - achieving <15mm² total passive area while delivering 50mA peak for ADC sampling bursts. |
Use Scenario: Isolated 3.3V local supply for CAN transceiver or isolated ADC in automotive body control modules, derived from 5V or 12V domain rails. IC Role / Device Role / Timing Role: Non-isolated auxiliary regulator providing clean 3.3V for digital I/O and level-shifting; LBO unused or tied to fixed voltage for fault indication. Use Value: No inductor required - avoids magnetic coupling into sensitive analog signals; SO-8 footprint matches standard decoupling layout practices. |
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 functionality but specified for –40°C to +85°C industrial temperature range vs. 0°C to +70°C commercial grade. | Required for automotive cabin modules or outdoor industrial sensors where ambient exceeds 70°C. | Select LTC1514IS8-3.3 if operating junction temperature may exceed 70°C; otherwise LTC1514CS8-3.3#TRPBF offers cost advantage for consumer-grade designs. |
| LTC1515CS8-3.3 | Includes reset output (RESET) and adjustable output version (ADJ); higher 100µA operating current; same SO-8 package and pinout. | Used where power-on reset assertion or programmable output voltage (e.g., 2.5V/3.3V selectable) is required. | LTC1515CS8-3.3 adds system-level supervision but increases quiescent current - choose only if RESET signal or voltage flexibility is mandatory. |
Compared with LTC1514CS8-3.3#TRPBF, the LTC1514IS8-3.3 extends temperature capability without changing electrical behavior, while the LTC1515CS8-3.3 trades ultra-low 60µA current for integrated reset functionality - making LTC1514CS8-3.3#TRPBF optimal for cost- and power-sensitive commercial applications with standard temperature requirements.
Availability
LTC1514CS8-3.3#TRPBF 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 RoHS-compliant packaging.
Supply support for LTC1514CS8-3.3#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-performance switched-capacitor regulators for ultra-low-power applications.
The LTC1514 series was designed for space-constrained, battery-powered systems needing regulated 3.3V/5V rails without inductors - targeting portable medical devices, smart meters, and IoT edge nodes where efficiency and shutdown current are critical.
FAQ
What is the input voltage range supported by the LTC1514CS8-3.3#TRPBF?
The LTC1514CS8-3.3#TRPBF operates from 2.0V to 8.0V input voltage. This range accommodates single-cell LiFePO₄ batteries (2.5–3.6V), two- or three-cell alkaline/NiCd packs (2.0–4.5V), and intermediate rails in multi-rail systems. Regulation remains within ±4% across this full span with loads up to 50mA.
Does the LTC1514CS8-3.3#TRPBF require an inductor?
No, the LTC1514CS8-3.3#TRPBF uses a switched-capacitor (charge pump) topology and requires only three external capacitors: one 0.22µF flying capacitor (C1) and two 10µF low-ESR bypass capacitors (CIN and COUT). This eliminates magnetic components, simplifying layout and reducing EMI in sensitive analog circuits.
How does the low-battery comparator function in shutdown mode for the LTC1514CS8-3.3#TRPBF?
The low-battery comparator inside the LTC1514CS8-3.3#TRPBF remains fully operational during shutdown: the LBI input continues sensing external voltage, and the open-drain LBO output pulls low when LBI falls below 1.145V. This allows battery monitoring and system-level shutdown decisions even when the main 3.3V rail is disabled.
What is the typical startup time for the LTC1514CS8-3.3#TRPBF?
The LTC1514CS8-3.3#TRPBF features internal soft-start with a typical turn-on time of 4ms from VOUT = 0V to 3.3V when using a 10µF output capacitor. This limits inrush current to approximately 12.5mA, preventing input rail collapse during power-up or wake-from-standby transitions.
Is the LTC1514CS8-3.3#TRPBF pin-compatible with other members of the LTC1514 family?
Yes, all LTC1514 variants - including LTC1514CS8-3.3#TRPBF, LTC1514CS8-5, LTC1514IS8-3.3, and LTC1514IS8-5 - share identical SO-8 pinout and footprint. Only the output voltage (3.3V vs. 5V) and temperature grade (commercial vs. industrial) differ, enabling drop-in replacement during design iteration or qualification.
LTC1514CS8-3.3#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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):
- 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#TRPBF FAQ
1.How can I place an order for LTC1514CS8-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1514CS8-3.3#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 LTC1514CS8-3.3#TRPBF reliable?
The price and inventory of LTC1514CS8-3.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1514CS8-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1514CS8-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1514CS8-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1514CS8-3.3#TRPBF?
LTC1514CS8-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1514CS8-3.3#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 LTC1514CS8-3.3#TRPBF?
For technical support, including LTC1514CS8-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1514CS8-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC1514CS8-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1514CS8-3.3#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 LTC1514CS8-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1514CS8-3.3#TRPBF?
All LTC1514CS8-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1514CS8-3.3#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 LTC1514CS8-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC1514CS8-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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