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Analog Devices Inc. LTC1516CS8#TRPBF
- Part No.:
- LTC1516CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1516CS8#TRPBF.pdf
- Description:
- IC REG CHARGE PUMP 5V 50MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,503
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Product details
Overview
LTC1516CS8#TRPBF from Analog Devices (formerly Linear Technology) is a micropower regulated 5V charge pump DC/DC converter designed for low-current, battery-powered systems. It accepts 2V–5V input, delivers ±4% regulated 5V output up to 50mA (at VIN ≥ 3V), and draws only 12µA typical quiescent current with no load. Its dual-mode (doubler/tripler) operation, thermal shutdown, and 8-pin SO package make it ideal for smart card readers and Li-ion backup supplies.
For engineers reviewing the LTC1516CS8#TRPBF datasheet, LTC1516CS8#TRPBF pinout, LTC1516CS8#TRPBF application, or LTC1516CS8#TRPBF equivalent, key selection criteria include ultralow IQ (<1µA in shutdown), input voltage range (2V–5V), regulated 5V ±4% output tolerance, 600kHz internal oscillator, and SO-8 package compatibility with industrial temperature range (–40°C to 85°C).
Technical Context
The LTC1516CS8#TRPBF uses a switched-capacitor topology with two flying capacitors (C1, C2) and internal 2-phase nonoverlapping clocking at 600kHz to generate regulated 5V output without inductors. It dynamically selects between doubler and tripler modes based on VIN and load conditions-tripler mode activates below VIN = 2.55V or under heavy load droop-to maintain >70% efficiency down to 10µA load.
Regulation is achieved via internal resistor divider feedback and three comparators (COMP1–COMP3) that control charge pump enable/disable timing and mode selection. The device includes CMOS-level SHDN input with ~VIN/2 threshold, full load disconnect in shutdown, and thermal protection that cycles between 135°C shutdown and 115°C restart during sustained VOUT short-circuit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5V ±4% - ensures stable logic-level supply for 5V microcontrollers and flash memory interfaces |
| Input Voltage Range | 2V to 5V - supports direct operation from 2-cell alkaline, Li-ion, or 3V system rails |
| Quiescent Current | 12µA typical (no load) - enables multi-year battery life in always-on sensor nodes |
| Shutdown Current | <1µA - eliminates standby drain in power-gated subsystems |
| Max Output Current | 50mA at VIN ≥ 3V - sufficient for smart card ICs, EEPROM programmers, and local 3V-to-5V conversion |
| Switching Frequency | 600kHz - allows use of small 0.22µF ceramic flying capacitors and compact PCB layout |
| Package | 8-pin SO (narrow) - industry-standard footprint with 1.27mm pitch, compatible with automated assembly |
Pinout & Package
Package: 8-lead plastic SO (narrow, 0.150" width), JEDEC MS-012AC compliant, rated for –40°C to +85°C industrial operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C1– (Pin 8) | Flying capacitor 1 negative terminal | Completes charge path for C1 during phase 1; must be connected directly to C1– with minimal trace inductance |
| SHDN (Pin 7) | Active-high CMOS shutdown control | Drives high to disconnect VOUT from VIN and reduce ICC to <1µA; requires defined logic level, no floating |
| GND (Pin 6) | Analog and power ground reference | Common return for all capacitors and internal regulators; must connect to low-impedance ground plane |
| C2– (Pin 5) | Flying capacitor 2 negative terminal | Completes charge path for C2 during phase 1; shares GND net but routed separately from C1– |
| C1+ (Pin 1) | Flying capacitor 1 positive terminal | Connects to top plate of C1 during discharge phase; critical for voltage stacking in tripler mode |
| VIN (Pin 2) | Main input supply (2V–5V) | Feeds internal oscillator, control logic, and charge pump; requires 10µF low-ESR capacitor within 5mm |
| VOUT (Pin 3) | Regulated 5V output | Delivers up to 50mA; output ripple ≤100mVP-P with 10µF low-ESR capacitor; disconnected in shutdown |
| C2+ (Pin 4) | Flying capacitor 2 positive terminal | Stacks with C1+ and VIN in tripler mode; determines output voltage headroom and efficiency trade-off |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode charge pump (doubler/tripler) | Automatically selects optimal topology to sustain >70% efficiency across 2V–5V input and 10µA–50mA loads |
| Ultralow shutdown current (<1µA) | Enables true zero-power sleep states in portable devices without external load switches |
| Internal 600kHz oscillator | Eliminates external timing components and reduces BOM count; supports 0.22µF flying caps for <0.1in² layout |
| Thermal shutdown with hysteresis | Protects against indefinite VOUT short-circuit by cycling between 135°C disable and 115°C re-enable |
| Load disconnect in shutdown | Prevents backfeed from VOUT to VIN, essential for battery-backed systems with shared rail domains |
Applications
| Smart Card Readers | Li-Ion Battery Backup Supplies |
|---|---|
Use Scenario: Powering ISO 7816-compliant smart cards in point-of-sale terminals and secure authentication devices. IC Role / Device Role / Timing Role: Provides regulated 5V VCC to card interface circuitry while drawing minimal current during card insertion detection and idle polling. Use Value: Enables >5-year battery life in portable readers using coin-cell or primary Li-SOCl₂ batteries due to 12µA operating and <1µA shutdown current. | Use Scenario: Maintaining volatile SRAM or real-time clock (RTC) power during main system power loss in industrial controllers. IC Role / Device Role / Timing Role: Acts as a low-quiescent backup regulator, sourcing 5V from partially depleted Li-ion cells (down to 2V) without requiring boost inductor. Use Value: Extends backup runtime by 3× compared to linear regulators, with guaranteed regulation even at end-of-discharge cell voltage. |
| 2-Cell Alkaline to 5V Conversion | 5V Flash Memory Programming |
Use Scenario: Generating stable 5V from two AA/AAA cells (2.0V–3.2V) in handheld test equipment and remote sensors. IC Role / Device Role / Timing Role: Serves as primary system supply for microcontrollers and peripherals, dynamically switching between doubler and tripler modes as battery voltage declines. Use Value: Eliminates need for discrete boost converters or voltage supervisors, reducing solution size to <0.1in² with only four external capacitors. | Use Scenario: Providing precise 5V programming voltage to NOR/NAND flash memory during firmware update cycles in embedded gateways. IC Role / Device Role / Timing Role: Delivers tightly regulated 5V ±4% output with fast turn-on time (500µs) and low ripple (≤100mVP-P) to meet JEDEC flash programming specs. Use Value: Prevents bit errors and write failures during high-current programming pulses (up to 50mA) without requiring post-regulation LDO filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar regulated charge pump DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1144CS8#PBF | 20mA max output, 8µA shutdown current, supports up to 20V input; lacks tripler mode and thermal shutdown | Better suited for higher-input-voltage, lower-current applications (e.g., industrial sensor front-ends); not recommended for 2V–3V battery inputs | Select LTC1144CS8#PBF only when input exceeds 5V or thermal robustness is secondary to ultra-low shutdown IQ |
| MAX682ESA+ | Fixed 5V output, 25mA max, 15µA operating current, no shutdown pin; uses single flying capacitor | Simpler layout but no load disconnect or programmable shutdown; limited to light-load, space-constrained designs | Choose MAX682ESA+ only for cost-sensitive, non-shutdown applications where 25mA output suffices and thermal protection is handled externally |
Compared with LTC1144CS8#PBF and MAX682ESA+, the LTC1516CS8#TRPBF uniquely combines 50mA output, tripler-mode efficiency optimization, thermal shutdown, and true load disconnect-making it the only option among the three capable of reliable 2V–5V operation with industrial temperature support and short-circuit survivability.
Availability
LTC1516CS8#TRPBF is available at Aetrix Electronics and suitable for smart card readers, Li-ion battery backup supplies, and 2-cell alkaline-to-5V conversion requiring stable component supply across industrial temperature grades and long-term production continuity.
Supply support for LTC1516CS8#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 DC/DC converters for ultra-low-power applications.
The LTC1516CS8#TRPBF belongs to Linear's micropower charge pump family, engineered specifically for battery-powered systems demanding regulated 5V output with sub-µA shutdown and minimal external components-targeting portable instrumentation, secure peripherals, and energy-harvesting edge nodes.
FAQ
What is the maximum continuous output current of the LTC1516CS8#TRPBF?
The LTC1516CS8#TRPBF delivers up to 50mA continuous output current when input voltage is ≥3V and ambient temperature is within the industrial range (–40°C to 85°C). At VIN ≥2V but <3V, maximum output is 20mA. These limits are enforced by internal thermal design and are specified in the Electrical Characteristics table with derating above 70°C ambient.
Does the LTC1516CS8#TRPBF require an external inductor?
No, the LTC1516CS8#TRPBF is a switched-capacitor (charge pump) DC/DC converter and operates without any inductors. It uses two external 0.22µF flying capacitors and two 10µF bulk capacitors (at VIN and VOUT) to achieve regulation-enabling ultra-compact, EMI-friendly layouts unsuitable for inductive solutions.
How does the LTC1516CS8#TRPBF handle short-circuit conditions on VOUT?
The LTC1516CS8#TRPBF survives continuous VOUT-to-GND short circuits via on-chip thermal shutdown. When junction temperature exceeds 135°C, the charge pump disables; it automatically re-enables once temperature falls to 115°C. This cycling prevents damage and allows safe operation until the fault is removed-no external current limiting is required.
What is the purpose of the SHDN pin on the LTC1516CS8#TRPBF?
The SHDN pin on the LTC1516CS8#TRPBF is an active-high CMOS input that disconnects VOUT from VIN and reduces supply current to <1µA when driven high. It must be driven to a defined logic level (not left floating) and accepts voltages up to 6V-even exceeding VIN-enabling direct interfacing with 3.3V or 5V GPIOs regardless of input rail.
Can the LTC1516CS8#TRPBF operate from a 2V input and still regulate 5V output?
Yes, the LTC1516CS8#TRPBF is fully specified to operate from 2V input and deliver regulated 5V ±4% output up to 20mA. Below VIN = 2.55V, it forces tripler mode to maintain regulation and efficiency-verified across the full industrial temperature range with appropriate 0.22µF flying capacitors and 10µF bulk capacitors.
LTC1516CS8#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
- Output Configuration:
- Positive
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 5V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 50mA
- Frequency - Switching:
- 600kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1516CS8#TRPBF FAQ
1.How can I place an order for LTC1516CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1516CS8#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 LTC1516CS8#TRPBF reliable?
The price and inventory of LTC1516CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1516CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1516CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1516CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1516CS8#TRPBF?
LTC1516CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1516CS8#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 LTC1516CS8#TRPBF?
For technical support, including LTC1516CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1516CS8#TRPBF requirements.
6.How does Aetrix verify that LTC1516CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1516CS8#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 LTC1516CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1516CS8#TRPBF?
All LTC1516CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1516CS8#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 LTC1516CS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1516CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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