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Analog Devices Inc. LTC1514CS8-5#PBF
- Part No.:
- LTC1514CS8-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1514CS8-5#PBF.pdf
- Description:
- IC REG CHARGE PUMP 5V 50MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:167
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Product details
Overview
LTC1514CS8-5#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 output current, features 650kHz switching frequency, 60µA operating current, and integrated low-battery comparator with active shutdown monitoring - used in battery-backed smart card readers and handheld instrumentation.
For engineers reviewing the LTC1514CS8-5#PBF datasheet, LTC1514CS8-5#PBF pinout, LTC1514CS8-5#PBF application, or LTC1514CS8-5#PBF equivalent, key selection criteria include input voltage flexibility (2.7–10V), soft-start turn-on time (4ms), ±4% output regulation at 50mA, low-battery detection threshold (1.145V), and SO-8 thermal performance (θJA = 110°C/W).
Technical Context
The LTC1514CS8-5#PBF implements a dual-mode charge pump architecture that automatically selects step-up (voltage doubler) or step-down (gated switch) operation based on VIN–VOUT differential. Internal voltage sensing adjusts effective output impedance to suppress inrush current during high-differential transitions.
Its uncommitted open-drain low-battery comparator remains active in shutdown, referenced to a 1.145V internal bandgap (±3%), enabling battery protection without external bias. Regulation relies on hysteresis-based burst-mode control, producing ~100mVP-P ripple essential for stable feedback loop operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±4% over 3.3–10V input at 50mA load - ensures compatibility with 5V logic and analog subsystems. |
| Input Voltage Range | 2.7V to 10V - supports 3-cell NiCd (3.6V), 4-cell alkaline (6V), and wall adapter inputs without external LDO pre-regulation. |
| Max Output Current | 50mA continuous - sufficient for powering microcontrollers, EEPROMs, and low-power sensors in portable devices. |
| Operating Current | 60µA typical at VIN ≤ 5V - extends battery life in always-on monitoring applications such as smart card interfaces. |
| Shutdown Current | 10µA typical at VIN ≤ 5V - enables ultra-low standby power in battery backup systems. |
| Switching Frequency | 650kHz nominal - allows use of small 0.22µF ceramic flying capacitor and minimizes EMI in space-constrained layouts. |
| Low-Battery Threshold | 1.145V ±3% with 1% hysteresis - provides precise undervoltage lockout for 3.6V Li-ion or 4.8V NiMH battery packs. |
Pinout & Package
Package: 8-lead plastic SO (SO-8, narrow 0.150", θJA = 110°C/W). Pinout validated per LTC1514-5 top-view diagram and PIN FUNCTIONS section.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: SHDN | Shutdown control input | Logic-high ≥1.6V enables regulator; logic-low ≤0.4V disables and disconnects load from VIN - enables system-level power sequencing. |
| 2: LBO | Open-drain low-battery output | Sinks current when LBI < 1.145V - requires external pull-up (50k–1MΩ) to interface with µC GPIO or reset controller. |
| 3: LBI | Low-battery comparator input | Monitors battery voltage via resistor divider - comparator remains active in shutdown for deep-discharge prevention. |
| 4: GND | Power ground reference | Must connect to low-impedance ground plane - critical for ripple suppression and thermal dissipation in SO-8 package. |
| 5: C1– | Flying capacitor negative terminal | Connects to 0.22µF ceramic capacitor - forms charge-transfer path for step-up/step-down mode switching. |
| 6: C1+ | Flying capacitor positive terminal | Paired with C1– to complete flying cap network - polarity-sensitive; reverse connection degrades efficiency. |
| 7: VIN | Input supply voltage | Accepts 2.7–10V; bypass with ≥10µF low-ESR capacitor - high-impedance source requires CIN to prevent dropout during charge cycles. |
| 8: VOUT | Regulated 5V output | Internally fixed via resistor divider; bypass with ≥10µF low-ESR capacitor - ripple reduction requires ≥22µF if VIN > 8V. |
Key Features
| Feature | Design Value |
|---|---|
| Step-up/step-down architecture | Automatically selects voltage-doubling or gated-switch mode based on VIN–VOUT differential - eliminates need for separate boost/buck ICs in multi-source systems. |
| Soft-start turn-on | 4ms typical VOUT ramp time - limits inrush to ≤12.5mA for 10µF COUT, preventing brownout in shared input rails. |
| Short-circuit protection | 12mA typical current limit at VOUT < 100mV - sustains indefinite short to GND without damage or thermal shutdown. |
| Overtemperature protection | Shuts down at ~150°C junction temperature; resumes at ~140°C - maintains reliability under sustained 50mA load at elevated ambient. |
| Three-capacitor design | Requires only CIN, COUT, and C1 (0.22µF) - reduces BOM count and PCB area vs inductor-based converters. |
Applications
| Smart Card Readers | Battery Backup Supplies |
|---|---|
Use Scenario: Powering ISO 7816-compliant contact smart cards from single 3.6V Li-ion or 4.8V NiMH battery. IC Role / Device Role / Timing Role: Provides regulated 5V VCC to card interface while monitoring battery health via LBI/LBO. Use Value: Enables autoswitch to backup rail when main battery falls below 4.6V, preserving transaction integrity during power loss. | Use Scenario: Maintaining RTC and SRAM power during AC mains failure in industrial controllers. IC Role / Device Role / Timing Role: Acts as isolated 5V backup regulator with shutdown-triggered battery disconnect to prevent deep discharge. Use Value: Extends backup runtime by 30% vs linear solutions due to 60µA quiescent current and active low-battery cutoff. |
| Handheld Instruments | Local Power Supplies |
Use Scenario: Supplying 5V to ADC front-end and microcontroller in portable multimeters powered by 4×AA alkaline cells. IC Role / Device Role / Timing Role: Regulates output across 6V (fresh) to 3.2V (depleted) input range while rejecting noise from switching display drivers. Use Value: Eliminates need for input pre-regulator, reducing component count and improving efficiency at light loads (≥85% at 1mA). | Use Scenario: Generating local 5V rail for FPGA configuration memory and I/O banks from noisy 12V system bus. IC Role / Device Role / Timing Role: Functions as low-noise, low-EMI point-of-load regulator decoupled from main SMPS ripple. Use Value: Achieves <100mVP-P ripple with 22µF COUT, meeting tight analog supply requirements without LC filtering. |
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 |
|---|---|---|---|
| LTC1515CS8-5#PBF | Includes reset output (RESET) and wider input range (2V–10V); same SO-8 package and pinout. | Required where power-on reset signaling is needed for µC initialization - not suitable if RESET functionality is unused and cost sensitivity is high. | Select LTC1515CS8-5#PBF only when system-level reset coordination is mandatory; otherwise LTC1514CS8-5#PBF offers lower cost and identical regulation performance. |
| LTC1517ES5#TRMPBF | SOT-23-5 package; 50mA output; no LBO/LBI pins; 60µA quiescent current; fixed 5V output. | Used in ultra-compact designs where board space is constrained and battery monitoring is handled externally - lacks integrated low-battery detection. | Choose LTC1517ES5#TRMPBF for space-limited applications without battery monitoring; LTC1514CS8-5#PBF remains optimal when LBO/LBI integration reduces external component count. |
Compared with LTC1515CS8-5#PBF, LTC1514CS8-5#PBF omits RESET but retains full low-battery comparator functionality in the same SO-8 footprint; versus LTC1517ES5#TRMPBF, it trades SOT-23 compactness for integrated battery monitoring and higher thermal capability - making LTC1514CS8-5#PBF the balanced choice for battery-powered instrumentation requiring both regulation and state awareness.
Availability
LTC1514CS8-5#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 guaranteed traceable sourcing.
Supply support for LTC1514CS8-5#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 full product support, datasheet archives, and application engineering for legacy Linear parts including the LTC series.
The LTC1514CS8-5#PBF belongs to Linear's micropower switched-capacitor DC/DC converter family, designed specifically for space- and energy-constrained portable electronics requiring regulation without inductors.
FAQ
What is the minimum input voltage required for LTC1514CS8-5#PBF to regulate 5V output?
The LTC1514CS8-5#PBF requires a minimum input voltage of 2.7V to maintain 5V regulation at full 50mA load, as specified in the Electrical Characteristics table under "VIN Operating Voltage" for the -5 variant. At lighter loads (≤15mA), regulation holds down to 2.7V input; operation below this threshold results in unregulated output or dropout. This makes LTC1514CS8-5#PBF compatible with three-cell NiCd/NiMH batteries across their full discharge curve.
Does LTC1514CS8-5#PBF require an inductor in its circuit design?
No, the LTC1514CS8-5#PBF uses a switched-capacitor (charge pump) topology and requires only three external capacitors: one flying capacitor (C1 = 0.22µF) and two bulk capacitors (CIN and COUT ≥10µF). This eliminates magnetic components, reduces EMI, and simplifies layout - a key differentiator from inductor-based buck/boost regulators. The absence of inductors is confirmed in the TYPICAL APPLICATION schematic and FEATURES list of the LTC1514-5 datasheet.
How does the low-battery comparator in LTC1514CS8-5#PBF function during shutdown mode?
The low-battery comparator in LTC1514CS8-5#PBF remains fully active during shutdown: LBI continues sensing input voltage, and LBO pulls low when LBI falls below 1.145V (±3%). This allows continuous battery monitoring without waking the main regulator - critical for battery preservation in backup systems. The LTC1514CS8-5#PBF datasheet explicitly states "comparator and 1.145V reference are kept alive in shutdown," confirming autonomous operation independent of SHDN state.
What is the maximum allowable input voltage for LTC1514CS8-5#PBF?
The absolute maximum input voltage for LTC1514CS8-5#PBF is 12V, as stated in the ABSOLUTE MAXIMUM RATINGS table. However, the recommended operating maximum is 10V - exceeding this risks violating the ±4% output regulation spec and increases output ripple beyond 100mVP-P. For inputs >8V, the datasheet mandates ≥22µF COUT to maintain ripple performance. Therefore, LTC1514CS8-5#PBF is rated for continuous operation up to 10V, with 12V permissible only as a non-repetitive stress condition.
Can LTC1514CS8-5#PBF be used in step-down-only applications?
Yes, LTC1514CS8-5#PBF operates natively in step-down mode when VIN exceeds 5V (e.g., 6–10V), using gated-switch architecture to regulate VOUT to 5V. Its dual-mode design automatically engages step-down operation without external configuration - confirmed by the BLOCK DIAGRAM and APPLICATIONS INFORMATION section describing "step-down gated switch" behavior. This eliminates manual mode selection and ensures seamless transition between step-up (VIN < 5V) and step-down (VIN > 5V) as input voltage varies.
LTC1514CS8-5#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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1514CS8-5#PBF FAQ
1.How can I place an order for LTC1514CS8-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1514CS8-5#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 LTC1514CS8-5#PBF reliable?
The price and inventory of LTC1514CS8-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1514CS8-5#PBF is usually 5 days.
3.What payment methods are accepted for LTC1514CS8-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1514CS8-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1514CS8-5#PBF?
LTC1514CS8-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1514CS8-5#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 LTC1514CS8-5#PBF?
For technical support, including LTC1514CS8-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1514CS8-5#PBF requirements.
6.How does Aetrix verify that LTC1514CS8-5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1514CS8-5#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 LTC1514CS8-5#PBF meets industry standards.
7.What is the process for return or replacement of LTC1514CS8-5#PBF?
All LTC1514CS8-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1514CS8-5#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 LTC1514CS8-5#PBF part is unused and in its original packaging.
Return procedure for LTC1514CS8-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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