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Analog Devices Inc. LTC1514IS8-5#TRPBF
- Part No.:
- LTC1514IS8-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1514IS8-5#TRPBF.pdf
- Description:
- IC REG CHARGE PUMP 5V 50MA 8SO
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC1514IS8-5#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 2.7V–10V input, delivering up to 50mA with ±4% regulation, 650kHz switching, and integrated low-battery comparator - used in battery-backed smart card readers and handheld instruments.
For engineers reviewing the LTC1514IS8-5#TRPBF datasheet, LTC1514IS8-5#TRPBF pinout, LTC1514IS8-5#TRPBF application, or LTC1514IS8-5#TRPBF equivalent, key selection criteria include input voltage range compatibility (2.7V–10V), shutdown current (10µA), soft-start timing (4ms), low-battery comparator trip point (1.145V), and SO-8 package thermal performance (θJA = 110°C/W).
Technical Context
The LTC1514IS8-5#TRPBF uses 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 limit inrush current.
Its uncommitted open-drain low-battery comparator remains active during shutdown, with 1.145V ±3% trip threshold and ≤50nA input bias current, enabling deep-discharge protection without external power. Regulation relies on hysteresis-based burst-mode control, producing ~100mVP-P output ripple at full load.
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 5V microcontrollers and peripherals. |
| Input Voltage Range | 2.7V to 10V - supports 3–4 cell NiCd/NiMH, alkaline, or wall adapter inputs without external regulators. |
| Max Output Current | 50mA continuous - sufficient for low-power sensors, EEPROMs, and smart card ICs in portable devices. |
| Operating Current | 60µA typical at VIN ≤ 5V - extends battery life in always-on monitoring applications. |
| Shutdown Current | 10µA maximum at VIN ≤ 5V - enables ultra-low-power sleep modes in battery backup systems. |
| Switching Frequency | 650kHz typical - allows use of small 0.22µF ceramic flying capacitor and minimizes EMI in space-constrained layouts. |
| Low-Battery Trip | 1.145V ±3% with 1% hysteresis - provides precise battery voltage monitoring with minimal external components. |
| Soft-Start Time | 4ms typical - limits inrush current to ~12.5mA into 10µF output cap, preventing input rail sag during wake-up. |
Pinout & Package
Package: 8-lead plastic SO (SO-8, narrow 0.150", θJA = 110°C/W). Pinout validated per Linear Technology LTC1514-5 datasheet Figure "TOP VIEW S8 PACKAGE" and PIN FUNCTIONS section.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (Pin 1) | Shutdown control input | Logic high (≥1.6V) enables regulator; logic low disables output and disconnects load from VIN - supports system-level power sequencing. |
| LBO (Pin 2) | Open-drain low-battery output | Sinks current when LBI < 1.145V; requires external pull-up (50k–1MΩ) - interfaces directly with µC GPIO or reset logic. |
| LBI (Pin 3) | Low-battery comparator input | Monitors battery voltage via resistor divider; comparator stays active in shutdown - enables battery cutoff before deep discharge. |
| GND (Pin 4) | Power ground reference | Must connect to low-impedance ground plane - critical for ripple suppression and thermal dissipation in SO-8 package. |
| C1– (Pin 5) | Flying capacitor negative terminal | Connects to 0.22µF ceramic flying cap - forms charge-transfer path for step-up/step-down conversion. |
| C1+ (Pin 6) | Flying capacitor positive terminal | Completes flying cap connection; polarity-sensitive - reversal prevents proper charge pump operation. |
| VIN (Pin 7) | Main input supply | Accepts 2.7V–10V; bypass with ≥10µF low-ESR capacitor - suppresses input ripple and sustains peak current during charge cycles. |
| VOUT (Pin 8) | Regulated 5V output | Delivers up to 50mA; bypass with ≥10µF low-ESR capacitor - reduces output ripple and improves transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Step-up/step-down charge pump | Single IC replaces separate boost + LDO or buck circuits - reduces BOM count and PCB area in dual-voltage battery systems. |
| Active low-battery comparator in shutdown | Enables autonomous battery cutoff while main regulator is off - eliminates need for auxiliary supervisor IC in backup supplies. |
| Soft-start limiting | Controls VOUT ramp rate to 4ms, capping inrush to 12.5mA into 10µF - avoids tripping upstream current-limited sources like coin cells. |
| Short-circuit & overtemperature protection | Survives indefinite GND short; shuts down at ~150°C and recovers at ~140°C - ensures robustness in unattended embedded deployments. |
| Only three external capacitors | Requires just CIN, COUT, and C1 (0.22µF) - simplifies layout and lowers cost vs. inductor-based converters needing EMI filtering. |
| 650kHz fixed-frequency operation | Enables consistent noise spectrum and predictable filter design - avoids variable-frequency jitter issues in sensitive analog subsystems. |
Applications
| Smart Card Readers | Battery Backup Supplies |
|---|---|
Use Scenario: Powering ISO 7816-compliant contact smart cards from single 3.7V Li-ion or 4×AA alkaline batteries. IC Role / Device Role / Timing Role: LTC1514IS8-5#TRPBF acts as primary 5V regulated supply, stepping up from 3.3V or stepping down from 6V while monitoring battery health via LBI/LBO. Use Value: Eliminates need for discrete boost + LDO chain; 10µA shutdown current preserves battery for >1 year in standby. | Use Scenario: Maintaining SRAM or real-time clock (RTC) power during main supply failure in industrial controllers. IC Role / Device Role / Timing Role: LTC1514IS8-5#TRPBF delivers clean 5V from backup battery, with LBO signaling low battery to trigger graceful shutdown before data loss. Use Value: Comparator remains active in shutdown, enabling reliable battery cutoff at 1.145V - prevents irreversible cell damage. |
| Handheld Test Instruments | Local Power Supplies |
Use Scenario: Providing isolated 5V rail for ADC reference and sensor interface in portable multimeters or DMMs. IC Role / Device Role / Timing Role: LTC1514IS8-5#TRPBF serves as compact, low-noise local regulator powered from main battery, rejecting input ripple via charge-pump topology. Use Value: 100mVP-P output ripple is filtered by downstream LC stage; 60µA quiescent current extends runtime between charges. | Use Scenario: Generating 5V for USB-peripheral interface or FPGA I/O banks in field-deployable edge nodes. IC Role / Device Role / Timing Role: LTC1514IS8-5#TRPBF functions as secondary regulated supply, accepting wide-input rails (e.g., 5–24V PoE-derived) and stepping down to 5V. Use Value: Input range up to 10V allows direct use of intermediate bus voltages; SO-8 package supports reflow-compatible assembly. |
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 | Commercial temperature grade (0°C to 70°C); same electrical specs and pinout as LTC1514IS8-5#TRPBF. | Not rated for industrial environments; unsuitable for extended outdoor or factory-floor deployments. | Select LTC1514CS8-5 only for cost-sensitive consumer-grade designs operating within 0–70°C ambient. |
| LTC1515IS8-5 | Includes power-on reset (POR) output; otherwise identical regulation, efficiency, and package - adds system-level reliability. | Provides hardware reset assertion during power-up; required for deterministic µC initialization in safety-critical firmware. | Choose LTC1515IS8-5 when POR functionality is needed; otherwise LTC1514IS8-5#TRPBF offers lower cost and same core performance. |
Compared with LTC1514CS8-5, the LTC1514IS8-5#TRPBF provides guaranteed operation down to –40°C, making it suitable for automotive and industrial edge nodes; versus LTC1515IS8-5, it omits POR but retains identical power conversion specs and lower unit cost where reset logic is handled externally.
Availability
LTC1514IS8-5#TRPBF is available at Aetrix Electronics and suitable for battery-operated equipment, smart card readers, and handheld instruments requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LTC1514IS8-5#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 its precision analog and power management portfolio with rigorous quality and longevity standards.
The LTC1514 series was designed specifically for ultra-low-power, wide-input-range DC/DC conversion in space- and energy-constrained portable electronics - emphasizing micropower operation, integrated supervision, and minimal external components.
FAQ
What is the operating temperature range for the LTC1514IS8-5#TRPBF?
The LTC1514IS8-5#TRPBF is specified for the industrial temperature range of –40°C to +85°C, verified per Absolute Maximum Ratings table and Electrical Characteristics test conditions. This rating applies to all parameters including output regulation accuracy, shutdown current, and low-battery comparator trip point - ensuring reliable performance in harsh environments such as factory automation or outdoor instrumentation where the LTC1514IS8-5#TRPBF is commonly deployed.
Can the LTC1514IS8-5#TRPBF operate with an input voltage below 2.7V?
No - the LTC1514IS8-5#TRPBF has a minimum specified input voltage of 2.7V, as confirmed in the Electrical Characteristics table under "VIN Operating Voltage" for the -5 variant. Operation below 2.7V is not guaranteed and may result in loss of regulation, increased ripple, or failure to start. For sub-2.7V applications, consider the LTC1514IS8-3.3 (min 2.0V) or LTC1522 (2V min, 6µA IQ), both of which share the same SO-8 footprint but differ in output voltage and quiescent current.
How does the low-battery comparator in the LTC1514IS8-5#TRPBF function during shutdown?
The low-battery comparator in the LTC1514IS8-5#TRPBF remains fully active during shutdown, continuously monitoring the LBI pin against its internal 1.145V reference and driving LBO low when triggered. This behavior is explicitly documented in the DESCRIPTION and PIN FUNCTIONS sections, enabling battery cutoff without waking the main regulator. The comparator draws <50nA from LBI and supports external resistor dividers - allowing precise trip-point programming while the LTC1514IS8-5#TRPBF consumes only 10µA total shutdown current.
What external capacitors are required for basic operation of the LTC1514IS8-5#TRPBF?
The LTC1514IS8-5#TRPBF requires exactly three external capacitors: a 0.22µF ceramic flying capacitor (C1) between C1+ and C1– pins; a ≥10µF low-ESR input capacitor (CIN) from VIN to GND; and a ≥10µF low-ESR output capacitor (COUT) from VOUT to GND. These values are specified in the TYPICAL APPLICATION schematic and APPLICATIONS INFORMATION section. Using smaller or higher-ESR capacitors increases output ripple beyond the typical 100mVP-P and may cause instability - confirming the minimal BOM requirement stated in the FEATURES list of the LTC1514IS8-5#TRPBF datasheet.
Is the LTC1514IS8-5#TRPBF pin-compatible with other parts in the LTC1514 family?
Yes - the LTC1514IS8-5#TRPBF shares identical SO-8 pinout and footprint with all members of the LTC1514 family, including LTC1514IS8-3.3, LTC1514CS8-5, and LTC1514CS8-3.3, as confirmed by the PACKAGE/ORDER INFORMATION table and TOP VIEW diagram. Functionally, SHDN, LBO, LBI, GND, VOUT, VIN, C1+, and C1– pins map identically across variants; only output voltage and temperature grade differ. This allows drop-in replacement during design iteration or qualification - provided input voltage and load requirements align with the selected variant's specifications.
LTC1514IS8-5#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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1514IS8-5#TRPBF FAQ
1.How can I place an order for LTC1514IS8-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1514IS8-5#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 LTC1514IS8-5#TRPBF reliable?
The price and inventory of LTC1514IS8-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1514IS8-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1514IS8-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1514IS8-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1514IS8-5#TRPBF?
LTC1514IS8-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1514IS8-5#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 LTC1514IS8-5#TRPBF?
For technical support, including LTC1514IS8-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1514IS8-5#TRPBF requirements.
6.How does Aetrix verify that LTC1514IS8-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1514IS8-5#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 LTC1514IS8-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1514IS8-5#TRPBF?
All LTC1514IS8-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1514IS8-5#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 LTC1514IS8-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC1514IS8-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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