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Analog Devices Inc. LTC1516CS8#PBF
- Part No.:
- LTC1516CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1516CS8#PBF.pdf
- Description:
- IC REG CHARGE PUMP 5V 50MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,109
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Product details
Overview
LTC1516CS8#PBF 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, 600kHz internal oscillator, and shutdown disconnect capability make it ideal for smart card readers and Li-ion backup supplies.
For engineers reviewing the LTC1516CS8#PBF datasheet, LTC1516CS8#PBF pinout, LTC1516CS8#PBF application, or LTC1516CS8#PBF equivalent, key selection criteria include ultralow IQ (<1µA in shutdown), input voltage range (2V–5V), output regulation tolerance (±4%), thermal/short-circuit protection, and SO-8 package compatibility with light-load efficiency down to 10µA.
Technical Context
The LTC1516CS8#PBF uses a switched-capacitor architecture with two independent flying capacitors (C1, C2) and dual-phase nonoverlapping clocking at 600kHz to generate regulated 5V output. Its control logic employs three comparators (COMP1–COMP3) to dynamically select between doubler and tripler modes based on VIN and load conditions-tripler mode activates below VIN = 2.55V or under heavy droop, enabling >70% efficiency from 10µA to 50mA.
Regulation is achieved via internal resistor-divider feedback and hysteresis-based enable/disable cycling. During shutdown, all circuitry powers down and VOUT is disconnected from VIN; SHDN is a CMOS input with VIH ≈ VIN/2 and requires active drive (no floating). Thermal shutdown engages at 135°C and recovers at 115°C, supporting indefinite short-circuit survival.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5V ±4% - maintains stable logic-level supply across 2V–5V input and 0–50mA load. |
| Input Voltage Range | 2V to 5V - supports single Li-ion, 2-cell alkaline/NiMH, or local 3V-to-5V conversion without external LDO pre-regulation. |
| Quiescent Current | 12µA typical (no load) - enables multi-year battery life in always-on sensor nodes or memory backup circuits. |
| Shutdown Current | <1µA - eliminates standby drain, critical for energy-harvesting and ultra-low-power wake-on-event designs. |
| Switching Frequency | 600kHz - allows use of small 0.22µF ceramic flying capacitors and compact PCB layout (<0.1 in²). |
| Max Output Current | 50mA at VIN ≥ 3V - sufficient for flash programming, SIM interface, or microcontroller I/O rail generation. |
| Protection Features | Thermal shutdown (135°C trip) + continuous VOUT-to-GND short survival - eliminates need for external fuse or current-limiting circuitry. |
Pinout & Package
Package: 8-pin plastic SO (narrow, 0.150-inch width), RoHS-compliant, rated for 0°C to 70°C commercial operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C1+ (Pin 1) | Flying capacitor 1 positive terminal | Connects to positive plate of first 0.22µF flying cap; forms charge-transfer path in both doubler and tripler modes. |
| VIN (Pin 2) | Input supply voltage | Accepts 2V–5V source; powers internal oscillator, comparators, and switch drivers; feeds C1/C2 during charging phase. |
| VOUT (Pin 3) | Regulated 5V output | Delivers ±4% 5V to load; internally disconnected from VIN during shutdown; requires ≥10µF low-ESR output capacitor. |
| C2+ (Pin 4) | Flying capacitor 2 positive terminal | Connects to positive plate of second 0.22µF flying cap; participates in series stacking during tripler mode. |
| C2– (Pin 5) | Flying capacitor 2 negative terminal | Reference node for C2; tied to GND during charge phase and to VOUT during discharge phase in tripler configuration. |
| GND (Pin 6) | Ground reference | Common return for VIN, VOUT, SHDN, and internal circuitry; must be low-impedance ground plane for ripple control. |
| SHDN (Pin 7) | Active-high shutdown control | CMOS input with threshold ~VIN/2; drives internal power gates to disconnect VOUT and halt oscillator when high. |
| C1– (Pin 8) | Flying capacitor 1 negative terminal | Reference node for C1; tied to GND during charge phase and to C2+ during discharge phase in stacked topology. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode charge pump (doubler/tripler) | Automatically selects optimal topology to sustain >70% efficiency from 10µA to 50mA load across full 2V–5V input range. |
| Ultralow shutdown current (<1µA) | Enables true zero-power standby in battery-backed SRAM, real-time clocks, or secure element keep-alive circuits. |
| Integrated thermal and short-circuit protection | Allows direct connection to Li-ion cells without external current limiting; survives indefinite VOUT-to-GND shorts. |
| No inductors required | Eliminates EMI concerns, size penalties, and cost of magnetic components-ideal for space-constrained portable PCBs. |
| Compact 0.1 in² application circuit | Uses only four external capacitors (two 0.22µF flying + two 10µF bulk); simplifies layout and reduces BOM count. |
Applications
| Smart Card Readers | Li-Ion Battery Backup Supplies |
|---|---|
Use Scenario: Powering ISO 7816-compliant smart cards in point-of-sale terminals or access control devices. IC Role / Device Role / Timing Role: Generates stable 5V VCC for card interface logic and level shifters from a 3.3V system rail or single-cell battery. Use Value: Maintains ±4% regulation under dynamic card-insertion loads while drawing <12µA idle current to extend host battery life. |
Use Scenario: Providing fail-safe 5V backup to RTC or SRAM during main power loss in portable medical or industrial equipment. IC Role / Device Role / Timing Role: Regulated charge pump delivering uninterrupted 5V from a depleted Li-ion cell (down to 2V) with automatic shutdown isolation. Use Value: Prevents data corruption during brownout by sustaining VOUT > 4.8V for >10 seconds with 10µF output capacitance and no external diode drop. |
| 2-Cell Alkaline/NiMH to 5V Conversion | 5V Flash Memory Programming |
Use Scenario: Replacing inefficient linear regulators in remote sensors powered by two AA/AAA batteries. IC Role / Device Role / Timing Role: Efficiently boosts decaying 3.2V–2.0V battery output to fixed 5V for MCU and peripheral operation. Use Value: Extends usable battery life by >3× versus LDO solutions due to >70% efficiency even at 20µA load and 2.2V input. |
Use Scenario: Supplying precise 5V programming voltage to NOR/NAND flash in embedded programmers or firmware update tools. IC Role / Device Role / Timing Role: Delivers clean, regulated 5V with <100mVP-P ripple (with 10µF low-ESR cap) for reliable byte/sector programming. Use Value: Eliminates programming errors caused by voltage droop or noise-critical for high-density flash with tight VPP tolerances. |
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 industrial sensors; insufficient for 50mA flash programming or smart card loads. | Select LTC1144CS8#PBF only when input exceeds 5V or thermal robustness is not required. |
| LTC1262CS8#PBF | Fixed 5V-to-12V boost (not input-flexible); 30mA output; no 2V–5V input support or shutdown disconnect. | Designed for EEPROM/EPROM programming rails-not for general-purpose 5V generation from low-voltage batteries. | Choose LTC1262CS8#PBF only for dedicated 12V programming applications; not a functional substitute for LTC1516CS8#PBF. |
Compared with LTC1144CS8#PBF and LTC1262CS8#PBF, the LTC1516CS8#PBF uniquely combines 2V–5V input flexibility, 50mA output, tripler-mode efficiency optimization, and thermal/short-circuit protection-making it the only option among the three suitable for battery-powered 5V rail generation with safety-critical reliability.
Availability
LTC1516CS8#PBF is available at Aetrix Electronics and suitable for smart card readers, Li-ion backup supplies, and 2-cell alkaline-to-5V conversion requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1516CS8#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 pioneered high-performance switching regulators and charge pumps for demanding portable and industrial applications.
The LTC1516CS8#PBF belongs to Linear's micropower DC/DC converter family, engineered specifically for ultra-low-quiescent-current battery-powered systems where efficiency at microamp loads and minimal external components are essential design constraints.
FAQ
What is the minimum input voltage supported by the LTC1516CS8#PBF?
The LTC1516CS8#PBF supports a minimum input voltage of 2V, enabling operation directly from partially discharged 2-cell alkaline, NiMH, or single-cell Li-ion batteries. Below 2V, regulation fails and VOUT drops proportionally; the absolute maximum rating for VIN is 6V, but sustained operation above 5V is not specified in the datasheet.
Does the LTC1516CS8#PBF require external inductors?
No, the LTC1516CS8#PBF is an inductorless charge pump DC/DC converter. It uses two external 0.22µF flying capacitors and two 10µF bulk capacitors (at VIN and VOUT) to achieve voltage doubling or tripling. This eliminates magnetic components, reducing EMI, board area, and cost compared to inductive boost converters.
How does shutdown functionality work on the LTC1516CS8#PBF?
The LTC1516CS8#PBF features an active-high CMOS SHDN pin (Pin 7). When driven high (≥0.7×VIN), it disables the internal oscillator and disconnects VOUT from VIN, reducing supply current to <1µA. The pin must be actively driven-floating is not allowed-and can accept logic levels exceeding VIN, simplifying interface with 3.3V or 5V controllers.
What output capacitor value is recommended for stable operation of the LTC1516CS8#PBF?
A minimum 10µF low-ESR capacitor (tantalum or ceramic) is required at VOUT for stable regulation per the datasheet. Using 22µF or greater further reduces output ripple, especially under high-load or high-VIN conditions. For lowest ripple, a parallel combination of 10–22µF tantalum and 1–3.3µF ceramic is recommended.
Can multiple LTC1516CS8#PBF devices be paralleled to increase output current?
Yes, two or more LTC1516CS8#PBF units can be paralleled: VIN, VOUT, GND, and SHDN pins may be tied together, but C1+ / C1– and C2+ / C2– must remain isolated per device. Output current scales approximately linearly (e.g., two units support ~100mA), though separate or scaled-up input/output capacitors are advised to maintain stability and minimize ripple.
LTC1516CS8#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
- 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#PBF FAQ
1.How can I place an order for LTC1516CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1516CS8#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 LTC1516CS8#PBF reliable?
The price and inventory of LTC1516CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1516CS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1516CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1516CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1516CS8#PBF?
LTC1516CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1516CS8#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 LTC1516CS8#PBF?
For technical support, including LTC1516CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1516CS8#PBF requirements.
6.How does Aetrix verify that LTC1516CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1516CS8#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 LTC1516CS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1516CS8#PBF?
All LTC1516CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1516CS8#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 LTC1516CS8#PBF part is unused and in its original packaging.
Return procedure for LTC1516CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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