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Analog Devices Inc. LTC1514IS8-5#PBF
- Part No.:
- LTC1514IS8-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1514IS8-5#PBF.pdf
- Description:
- IC REG CHARGE PUMP 5V 50MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:133
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Product details
Overview
LTC1514IS8-5#PBF 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 open-drain LBO output, soft-start (4ms), and ±4% output regulation - used in battery-backed smart card readers and handheld instrumentation.
For engineers reviewing the LTC1514IS8-5#PBF datasheet, LTC1514IS8-5#PBF pinout, LTC1514IS8-5#PBF application, or LTC1514IS8-5#PBF equivalent, key selection criteria include input voltage flexibility (2.7–10V), shutdown current (10µA), low-battery detection threshold (1.145V), SO-8 thermal performance (θJA = 110°C/W), and charge-pump architecture enabling both boost and buck modes without inductors.
Technical Context
The LTC1514IS8-5#PBF uses a hysteresis-controlled charge pump with internal 1.145V reference and 650kHz oscillator to regulate VOUT at 5V. Its unique mode-switching logic automatically selects step-up (VIN < VOUT) or step-down (VIN > VOUT) operation based on VIN–VOUT differential, adjusting effective output impedance to limit inrush current.
Internal soft-start controls VOUT ramp rate (4ms to 5V with 10µF COUT), while the always-active low-battery comparator (LBI/LBO) remains functional in shutdown. Protection includes short-circuit current limiting (~12mA typ) and thermal shutdown at ~150°C, with recovery at ~140°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±4% over 3.3V–10V VIN and 0–50mA load - enables direct replacement of linear regulators in 5V rail systems. |
| Input Voltage Range | 2.7V to 10V - supports 3-cell NiCd (3.6V), 4-cell alkaline (6V), or wall adapter inputs without external regulation. |
| Max Output Current | 50mA continuous - sufficient for low-power microcontrollers, EEPROMs, and smart card ICs. |
| Quiescent Current | 60µA typical at VIN ≤ 5V - extends battery life in always-on monitoring circuits. |
| Shutdown Current | 10µA typical at VIN ≤ 5V - ensures minimal drain during system sleep states. |
| Switching Frequency | 650kHz nominal - allows use of small 0.22µF ceramic flying capacitor and reduces EMI compared to lower-frequency charge pumps. |
| Low-Battery Threshold | 1.145V ±3% on LBI pin - configurable via external resistor divider to monitor battery voltage down to ~2.7V with 3:1 scaling. |
Pinout & Package
Package: 8-lead plastic SO (SO-8, narrow 0.150", θJA = 110°C/W). RoHS-compliant, lead-free (PBF suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (Pin 1) | Logic-controlled shutdown input | Active-high enable (VIH ≥ 1.6V); disconnects load from VIN in shutdown; must not float - tie to VIN if unused. |
| 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 node (±50nA bias) referenced to internal 1.145V; remains active in shutdown for battery monitoring. |
| GND (Pin 4) | Power and signal ground | Must connect to low-impedance ground plane to minimize noise coupling into charge pump and comparator paths. |
| C1– (Pin 5) | Flying capacitor negative terminal | Connects to negative side of 0.22µF ceramic flying capacitor; critical for charge transfer timing and ripple control. |
| C1+ (Pin 6) | Flying capacitor positive terminal | Connects to positive side of same flying capacitor; forms charge-transfer path with C1– and internal switches. |
| VIN (Pin 7) | Input supply voltage | Accepts 2.7–10V; requires ≥10µF low-ESR bypass capacitor near pin to suppress switching transients. |
| VOUT (Pin 8) | Regulated 5V output | Delivers up to 50mA; requires ≥10µF low-ESR output capacitor; ripple inherently present (100mVP-P) due to hysteresis regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Step-up/step-down charge pump | Single IC replaces separate boost/buck converters - eliminates inductors and simplifies layout for dual-mode battery-powered rails. |
| Integrated low-battery comparator | 1.145V reference with open-drain LBO remains active in shutdown - enables autonomous battery protection without external supervisor IC. |
| Soft-start circuitry | 4ms VOUT ramp time limits inrush current to ~12.5mA (with 10µF COUT) - prevents brownout during power-up or wake-from-shutdown. |
| Thermal and short-circuit protection | Shuts down at ~150°C junction temperature and limits short-circuit current to ~12mA - ensures survivability under fault conditions. |
| Ultra-low shutdown current | 10µA max at VIN ≤ 5V - reduces standby drain in battery backup systems where months of shelf life are required. |
Applications
| Battery-Operated Smart Card Readers | Local 5V Power Supplies |
|---|---|
Use Scenario: Portable EMV-compliant card readers powered by 3×AA alkaline cells (4.5V fresh, dropping to 3.0V). IC Role / Device Role / Timing Role: LTC1514IS8-5#PBF regulates stable 5V rail for card interface IC and secure element, while LBI monitors cell voltage to trigger low-battery alert before cutoff. Use Value: Eliminates need for discrete LDO + supervisor; maintains 5V output down to 2.7V input, extending usable battery life by >25% vs fixed-dropout regulators. | Use Scenario: Isolated 5V local supply for RS-485 transceivers or sensor front-ends in industrial PLC modules. IC Role / Device Role / Timing Role: LTC1514IS8-5#PBF generates clean 5V from noisy 12V or 24V backplane, using charge-pump topology to avoid magnetic interference from inductors. Use Value: SO-8 package fits tight board spaces; 650kHz switching minimizes conducted EMI; ±4% regulation meets RS-485 driver VCC tolerance requirements. |
| Handheld Test Instruments | Battery Backup Supplies |
Use Scenario: Pocket-sized multimeter with LCD, µC, and analog front-end, powered by 3×AAA NiMH cells (3.6V nominal, 2.7V minimum). IC Role / Device Role / Timing Role: LTC1514IS8-5#PBF supplies regulated 5V to µC and ADC while providing real-time battery health via LBO-driven LED indicator. Use Value: 60µA operating current extends runtime between charges; soft-start prevents display flicker during power-on; no inductor simplifies mechanical design. | Use Scenario: RAM backup circuit in embedded controllers, maintaining SRAM contents during main power loss using 3.6V Li-ion coin cell. IC Role / Device Role / Timing Role: LTC1514IS8-5#PBF converts 3.6V battery to 5V backup rail, with SHDN controlled by main supply presence to auto-switch between primary and backup sources. Use Value: Shutdown disconnects battery from VIN, preventing reverse current; 10µA shutdown current enables >1-year backup duration with typical 40mAh coin cell. |
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 |
|---|---|---|---|
| LTC1514CS8-5 | Same functionality and pinout, but rated for 0°C to 70°C commercial temperature range vs –40°C to 85°C for LTC1514IS8-5#PBF. | Not suitable for extended-temperature industrial or automotive environments where ambient exceeds 70°C. | Select LTC1514IS8-5#PBF for designs requiring guaranteed operation at –40°C or 85°C; choose CS8-5 only for cost-sensitive commercial-grade products. |
| LTC1515IS8-5 | Includes power-on reset (POR) output and adjustable output version (ADJ), but shares identical 5V fixed-output variant, SO-8 package, and 2.7–10V input range. | Provides additional system-level reset signaling; otherwise functionally interchangeable in 5V-regulated applications. | LTC1515IS8-5 is a drop-in alternative if POR functionality is needed; otherwise LTC1514IS8-5#PBF offers lower BOM count and identical core regulation performance. |
Compared with LTC1514CS8-5, the LTC1514IS8-5#PBF guarantees full specification compliance over –40°C to 85°C, making it essential for industrial deployments; versus LTC1515IS8-5, it omits POR but reduces component count and cost where reset signaling is handled externally.
Availability
LTC1514IS8-5#PBF is available at Aetrix Electronics and suitable for battery-operated smart card readers, handheld test instruments, and local 5V power supplies requiring stable component supply, long-term lifecycle support, and guaranteed extended-temperature operation.
Supply support for LTC1514IS8-5#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 its precision analog and power management portfolio. Linear's legacy ICs emphasize high efficiency, low quiescent current, and robust protection - especially for portable and industrial systems.
The LTC1514 series belongs to Linear's micropower switched-capacitor DC/DC converter product line, designed specifically for space-constrained, battery-sensitive applications needing regulated 3.3V or 5V rails without inductors.
FAQ
What is the input voltage range supported by the LTC1514IS8-5#PBF?
The LTC1514IS8-5#PBF supports an input voltage range of 2.7V to 10V. This wide range accommodates common battery chemistries including 3-cell NiCd/NiMH (3.6V), 4-cell alkaline (6V), and unregulated wall adapters. Operation below 2.7V is not specified and may result in loss of regulation or failure to start.
Does the LTC1514IS8-5#PBF require external inductors?
No, the LTC1514IS8-5#PBF uses a switched-capacitor (charge-pump) architecture and requires only three external capacitors: one 0.22µF flying capacitor (C1) and two 10µF low-ESR bypass capacitors (CIN and COUT). This eliminates inductors, reducing EMI, board area, and cost compared to inductive DC/DC solutions.
How does the low-battery comparator in the LTC1514IS8-5#PBF operate during shutdown?
The low-battery comparator in the LTC1514IS8-5#PBF remains fully active during shutdown - its 1.145V internal reference and LBI/LBO circuitry continue functioning even when SHDN is pulled low. This allows continuous battery monitoring and wake-up triggering without exiting shutdown, preserving ultra-low 10µA shutdown current.
What is the typical output voltage ripple of the LTC1514IS8-5#PBF under full load?
Under full 50mA load and with a 10µF low-ESR output capacitor, the LTC1514IS8-5#PBF exhibits typical output ripple of 100mV peak-to-peak. This ripple is inherent to its hysteresis-based regulation scheme. Using a larger COUT (e.g., 22µF) or adding a parallel 1µF ceramic capacitor reduces ripple amplitude and high-frequency components.
Can the LTC1514IS8-5#PBF be used in step-down mode only?
Yes - the LTC1514IS8-5#PBF automatically operates in step-down mode when VIN exceeds 5V (e.g., 6–10V inputs), functioning as a gated switch to regulate VOUT at 5V. Its internal sensing circuitry detects the VIN–VOUT differential and configures the charge pump accordingly, eliminating manual mode selection or external control logic.
LTC1514IS8-5#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):
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1514IS8-5#PBF FAQ
1.How can I place an order for LTC1514IS8-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1514IS8-5#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 LTC1514IS8-5#PBF reliable?
The price and inventory of LTC1514IS8-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1514IS8-5#PBF is usually 5 days.
3.What payment methods are accepted for LTC1514IS8-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1514IS8-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1514IS8-5#PBF?
LTC1514IS8-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1514IS8-5#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 LTC1514IS8-5#PBF?
For technical support, including LTC1514IS8-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1514IS8-5#PBF requirements.
6.How does Aetrix verify that LTC1514IS8-5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1514IS8-5#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 LTC1514IS8-5#PBF meets industry standards.
7.What is the process for return or replacement of LTC1514IS8-5#PBF?
All LTC1514IS8-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1514IS8-5#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 LTC1514IS8-5#PBF part is unused and in its original packaging.
Return procedure for LTC1514IS8-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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