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Analog Devices Inc. LTC1514CS8-5#TRPBF
- Part No.:
- LTC1514CS8-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1514CS8-5#TRPBF.pdf
- Description:
- IC REG CHARGE PUMP 5V 50MA 8SO
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC1514CS8-5#TRPBF from Analog Devices (formerly Linear Technology) is a micropower switched-capacitor DC/DC converter that provides regulated 5V output via step-up or step-down operation across a 2.7V–10V input range. It delivers up to 50mA, features integrated low-battery comparator with active shutdown monitoring, soft-start limiting inrush current, and operates at 650kHz switching frequency - used in battery-backed smart card readers and handheld instrumentation.
For engineers reviewing the LTC1514CS8-5#TRPBF datasheet, LTC1514CS8-5#TRPBF pinout, LTC1514CS8-5#TRPBF application, or LTC1514CS8-5#TRPBF equivalent, key selection criteria include its ±4% output regulation over wide VIN, 10µA shutdown current, SO-8 package compatibility, and dual-mode charge-pump architecture enabling seamless autoswitching between battery and wall adapter supplies.
Technical Context
The LTC1514CS8-5#TRPBF uses a hysteresis-controlled charge-pump regulator with internal 1.145V reference and voltage-sensing logic to automatically select step-up (VIN < VOUT) or step-down (VIN > VOUT) mode. Its burst-mode operation enables high efficiency at light loads while maintaining 100mVP-P output ripple under full load.
It integrates an uncommitted open-drain low-battery comparator (LBO/LBI pins) that remains active during shutdown, allowing external battery protection circuits to function without waking the regulator. The 650kHz oscillator drives flying capacitor C1± (0.22µF typical) and supports ceramic/tantalum output capacitors ≥10µF for stable 5V delivery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±4% over 2.7V–10V input and 0–50mA load - ensures stable logic supply for microcontrollers and peripherals. |
| Input Voltage Range | 2.7V to 10V - supports 3-cell NiCd (3.6V), 4-cell alkaline (6V), or wall adapters up to 10V without external regulators. |
| Max Output Current | 50mA continuous - sufficient for low-power sensors, EEPROMs, and smart card ICs in portable systems. |
| Quiescent Current | 60µA typical - extends battery life in always-on monitoring applications like backup power supervisors. |
| Shutdown Current | 10µA typical - enables ultra-low standby power when system is idle or powered off. |
| Switching Frequency | 650kHz nominal - allows use of small 0.22µF flying capacitor and minimizes EMI in space-constrained PCB layouts. |
| Low-Battery Threshold | 1.145V ±3% on LBI pin - configurable via external resistor divider to trigger shutdown before deep battery discharge. |
Pinout & Package
Package: 8-lead plastic SO (SO-8, narrow 0.150"), JEDEC MS-012AC, θJA = 110°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: SHDN | Shutdown control input | Logic-high (≥1.6V) enables regulator; logic-low (≤0.4V) disables output and reduces supply current to 10µA. |
| 2: LBO | Open-drain low-battery comparator output | Sinks current when LBI voltage drops below 1.145V; requires external pull-up for interfacing with µC GPIO or reset logic. |
| 3: LBI | Low-battery comparator input | Monitors battery voltage via resistor divider; comparator remains active even in shutdown mode. |
| 4: GND | Power ground reference | Must connect to low-impedance ground plane to minimize noise coupling into sensitive analog blocks. |
| 5: C1– | Flying capacitor negative terminal | Connects to negative side of 0.22µF ceramic flying capacitor; critical path for charge transfer timing and efficiency. |
| 6: C1+ | Flying capacitor positive terminal | Connects to positive side of 0.22µF ceramic flying capacitor; forms charge-pump switching node with C1–. |
| 7: VIN | Input voltage supply | Accepts 2.7V–10V; bypass with ≥10µF low-ESR capacitor near pin to suppress input ripple and inrush transients. |
| 8: VOUT | Regulated 5V output | Delivers up to 50mA; requires ≥10µF low-ESR output capacitor (22µF recommended for VIN > 8V) to maintain ≤100mVP-P ripple. |
Key Features
| Feature | Design Value |
|---|---|
| Step-up/step-down charge-pump architecture | Automatically selects mode based on VIN–VOUT differential - eliminates need for separate boost/buck converters in dual-supply systems. |
| Active low-battery comparator in shutdown | Enables battery protection circuitry to remain functional without powering the main regulator - critical for long-term backup integrity. |
| Soft-start turn-on time | 4ms typical VOUT ramp from 0V to 5V - limits inrush current to ~12.5mA with 10µF output cap, preventing brownout of shared input rails. |
| Short-circuit and overtemperature protection | Survives indefinite GND short; shuts down at ~150°C junction temperature and recovers at ~140°C - ensures robustness in unattended deployments. |
| Only three external capacitors required | Reduces BOM count and board area: one 0.22µF flying cap + two ≥10µF input/output caps - simplifies layout and lowers cost vs inductor-based solutions. |
Applications
| Smart Card Readers | Battery Backup Supplies |
|---|---|
Use Scenario: Portable EMV-compliant card readers powered by 3-cell NiCd batteries with automatic switchover to USB host power. IC Role / Device Role / Timing Role: LTC1514CS8-5#TRPBF acts as primary 5V local supply, regulating both battery and USB inputs while providing low-battery warning via LBO to suspend transactions. Use Value: Enables zero-reverse-current autoswitching using external diodes and maintains 5V ±4% under varying load (10–50mA) and input (3.6–5.25V), eliminating need for discrete OR-ing controllers. | Use Scenario: Real-time clock (RTC) and SRAM backup in industrial PLCs where main 5V rail may fail unexpectedly. IC Role / Device Role / Timing Role: LTC1514CS8-5#TRPBF serves as isolated 5V backup generator from coin cell or supercapacitor, with LBI monitoring backup source health. Use Value: Delivers regulated 5V at up to 15mA from 2.7V input (e.g., 3.3V Li-ion at end-of-life), while shutdown current of 10µA preserves backup energy for months. |
| Handheld Instruments | Local Power Supplies |
Use Scenario: Battery-powered multimeter with LCD, ADC, and Bluetooth LE module requiring clean 5V for analog front-end and digital subsystems. IC Role / Device Role / Timing Role: LTC1514CS8-5#TRPBF supplies 5V to mixed-signal sections, with soft-start preventing display flicker during power-on and LBO triggering low-power mode at 3.0V battery threshold. Use Value: Achieves 80%+ efficiency at 10mA load from 4.2V Li-ion, and 65% at 50mA from 2.7V - outperforming linear regulators in dynamic battery discharge profiles. | Use Scenario: Isolated 5V rail for optocoupler drivers or level-shifting interfaces in automotive body control modules. IC Role / Device Role / Timing Role: LTC1514CS8-5#TRPBF generates local 5V from noisy 12V vehicle bus, rejecting ripple via charge-pump isolation and minimizing conducted EMI. Use Value: No inductor required - avoids magnetic coupling into adjacent CAN or LIN signal traces; SO-8 footprint fits tight routing constraints near connectors. |
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 |
|---|---|---|---|
| LTC1514IS8-5 | Same functionality but rated for –40°C to +85°C industrial temperature range; 10µA shutdown current identical. | Required for extended-temperature environments such as automotive cabins or outdoor metering. | Select LTC1514IS8-5 when operating ambient exceeds 70°C or storage conditions demand wider thermal margin. |
| LTC1515CS8-5 | Includes power-on reset (POR) output; otherwise identical pinout, specs, and SO-8 package. | Needed where microcontroller reset coordination is mandatory during power-up or brownout recovery. | Choose LTC1515CS8-5 only if POR signal integration eliminates need for external supervisor IC. |
Compared with LTC1514CS8-5#TRPBF, the LTC1514IS8-5 offers broader temperature tolerance without trade-offs in efficiency or quiescent current, while the LTC1515CS8-5 adds POR functionality at the cost of slightly higher BOM complexity - neither is pin-compatible drop-in replacements, but both share identical electrical behavior and layout footprint.
Availability
LTC1514CS8-5#TRPBF is available at Aetrix Electronics and suitable for battery-operated equipment, smart card readers, and handheld instruments requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for LTC1514CS8-5#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 full product support, documentation, and manufacturing continuity for legacy Linear parts including the LTC series.
The LTC1514CS8-5#TRPBF belongs to Linear's micropower switched-capacitor DC/DC converter family, designed specifically for space- and power-constrained battery-powered systems needing regulated 5V without inductors.
FAQ
What is the maximum input voltage rating for the LTC1514CS8-5#TRPBF?
The absolute maximum input voltage for the LTC1514CS8-5#TRPBF is 12V, but the specified operating range is 2.7V to 10V. Exceeding 10V during normal operation risks violating output regulation accuracy and may increase output ripple beyond 100mVP-P; sustained operation above 12V can cause permanent damage per Absolute Maximum Ratings.
Does the LTC1514CS8-5#TRPBF require an inductor?
No, the LTC1514CS8-5#TRPBF is a switched-capacitor (charge-pump) DC/DC converter and uses only capacitors - specifically one 0.22µF flying capacitor (C1±) and two ≥10µF input/output capacitors. This eliminates magnetic components, reduces EMI, and simplifies PCB layout compared to inductor-based buck/boost topologies.
Can the LTC1514CS8-5#TRPBF operate with a 2.5V input?
No - the LTC1514CS8-5#TRPBF has a minimum operating input voltage of 2.7V. At 2.5V, the device will not regulate and VOUT will track VIN minus losses. This is confirmed in the Electrical Characteristics table: "VIN Operating Voltage, LTC1514-5" specifies min = 2.7V under guaranteed conditions.
How does the low-battery comparator in the LTC1514CS8-5#TRPBF behave during shutdown?
The low-battery comparator in the LTC1514CS8-5#TRPBF remains fully active during shutdown: LBI continues sampling external voltage, and LBO pulls low when LBI falls below 1.145V. This allows battery monitoring and system-level shutdown decisions without waking the main regulator - a key feature for ultra-low-power backup applications.
What is the typical output voltage ripple of the LTC1514CS8-5#TRPBF under full load?
The typical output voltage ripple of the LTC1514CS8-5#TRPBF is 100mVP-P at full 50mA load with VIN < 8V and a 10µF low-ESR output capacitor. For VIN ≥ 8V, Analog Devices recommends increasing COUT to 22µF or greater to maintain ripple within this specification, as higher input differentials increase charge-transfer magnitude per cycle.
LTC1514CS8-5#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):
- 2.7V
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- 5V
- 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
LTC1514CS8-5#TRPBF FAQ
1.How can I place an order for LTC1514CS8-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1514CS8-5#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 LTC1514CS8-5#TRPBF reliable?
The price and inventory of LTC1514CS8-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1514CS8-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1514CS8-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1514CS8-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1514CS8-5#TRPBF?
LTC1514CS8-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1514CS8-5#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 LTC1514CS8-5#TRPBF?
For technical support, including LTC1514CS8-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1514CS8-5#TRPBF requirements.
6.How does Aetrix verify that LTC1514CS8-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1514CS8-5#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 LTC1514CS8-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1514CS8-5#TRPBF?
All LTC1514CS8-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1514CS8-5#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 LTC1514CS8-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC1514CS8-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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