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Analog Devices Inc. LTC1516IS8#TRPBF
- Part No.:
- LTC1516IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1516IS8#TRPBF.pdf
- Description:
- IC REG CHARGE PUMP 5V 50MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,870
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Product details
Overview
LTC1516IS8#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 up to 50mA output with ±4% regulation, operates at 600kHz internal switching frequency, and draws only 12µA typical quiescent current - making it ideal for smart card readers and Li-ion backup supplies.
For engineers reviewing the LTC1516IS8#TRPBF datasheet, LTC1516IS8#TRPBF pinout, LTC1516IS8#TRPBF application, or LTC1516IS8#TRPBF equivalent, key selection criteria include ultralow shutdown current (<1µA), automatic doubler/tripler mode switching for efficiency optimization across input voltage and load, thermal protection, and SO-8 package compatibility with space-constrained PCB layouts.
Technical Context
The LTC1516IS8#TRPBF implements a switched-capacitor topology with dual flying capacitors (C1, C2) and internal 2-phase nonoverlapping clocking at 600kHz. Regulation is achieved via hysteresis-based comparator feedback (COMP2) controlling charge pump enable/disable cycles, with COMP1 and COMP3 dynamically selecting between doubler and tripler modes depending on VIN and load conditions.
It features CMOS-level active-high SHDN control, internal 5V reference, and integrated short-circuit/thermal protection that cycles between 135°C shutdown and 115°C restart. In shutdown, VOUT is fully disconnected from VIN, eliminating reverse current path and enabling true load isolation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5V ±4% - tightly regulated for logic-level compatibility with 5V microcontrollers and flash memory interfaces |
| Input Voltage Range | 2V to 5V - supports 2-cell alkaline, Li-ion, or 3V system rails without external LDO pre-regulation |
| Max Output Current | 50mA @ VIN ≥ 3V - sufficient for powering small peripherals like SIM card interfaces or EEPROM programmers |
| Quiescent Current | 12µA typical @ no load - enables multi-year battery life in always-on low-duty-cycle applications |
| Shutdown Current | <1µA - ensures negligible battery drain during extended standby or sleep modes |
| Switching Frequency | 600kHz - enables use of small 0.22µF ceramic flying capacitors and compact 0.1 in² layout |
| Output Ripple | 100mVP-P @ full load - manageable with standard 10µF low-ESR tantalum or ceramic output capacitor |
Pinout & Package
Package: 8-pin SO (Small Outline, narrow 0.150", JEDEC MS-012), RoHS-compliant, industrial temperature range (–40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C1+ (Pin 1) | Flying capacitor 1 positive terminal | Connects to positive plate of first flying capacitor; critical node for charge transfer timing and EMI control |
| VIN (Pin 2) | Input supply voltage | Accepts 2V–5V unregulated source; must be decoupled with ≥10µF low-ESR capacitor near pin |
| VOUT (Pin 3) | Regulated 5V output | Delivers stable 5V ±4% to load; disconnected from VIN during shutdown |
| C2+ (Pin 4) | Flying capacitor 2 positive terminal | Completes charge pump stack in tripler mode; shares layout sensitivity with C1+ |
| C2– (Pin 5) | Flying capacitor 2 negative terminal | Common return for second flying capacitor; ties to ground plane for noise reduction |
| GND (Pin 6) | Power and signal ground | Primary reference for all internal comparators and logic; requires low-impedance connection to PCB ground plane |
| SHDN (Pin 7) | Active-high shutdown control | CMOS-compatible input; threshold ≈ VIN/2; must not float - tie high/low externally |
| C1– (Pin 8) | Flying capacitor 1 negative terminal | Common return for first flying capacitor; forms charge/discharge loop with C1+ |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates magnetic components, EMI filters, and board area - reduces BOM count and design risk in portable devices |
| Automatic mode switching | Dynamically selects doubler (VIN > 2.55V) or tripler (VIN < 2.55V or heavy load) to maintain >70% efficiency down to 10µA load |
| Thermal shutdown with hysteresis | Disables charge pump at 135°C junction temp and re-enables at 115°C - prevents latch-up during sustained short-circuit events |
| Load disconnect in shutdown | Physically isolates VOUT from VIN using internal switches - avoids backfeed and enables true zero-power standby |
| Ultralow IQ modulation support | Accepts 5Hz–100Hz, 95–98% duty cycle SHDN pulses to achieve <5µA effective no-load supply current |
Applications
| Smart Card Readers | Li-Ion Battery Backup Supplies |
|---|---|
Use Scenario: Powering ISO 7816-compliant smart cards from a 3.3V host MCU rail or single-cell Li-ion source. IC Role / Device Role / Timing Role: Regulated 5V supply generator with fast turn-on time (500µs) and load-disconnect capability during card removal. Use Value: Ensures reliable card reset and communication without requiring separate 5V rail or bulky inductors. |
Use Scenario: Providing fail-safe 5V backup to real-time clocks or SRAM during main power loss in portable medical or metering devices. IC Role / Device Role / Timing Role: Low-quiescent, high-efficiency charge pump maintaining regulation during long-term battery standby. Use Value: Extends backup runtime by minimizing leakage - 12µA operating ICC and <1µA shutdown current preserve battery capacity. |
| 2-Cell Alkaline to 5V Conversion | 5V Flash Memory Programming |
Use Scenario: Generating stable 5V from two AA/AAA cells (2.0–3.2V fresh) in handheld test equipment or remote sensors. IC Role / Device Role / Timing Role: Input-voltage-adaptive charge pump that switches between doubler and tripler modes to sustain regulation as battery depletes. Use Value: Enables full device operation down to 2V input - extends usable battery life beyond linear regulator limits. |
Use Scenario: Supplying precise 5V programming voltage to NOR/NAND flash ICs during firmware update in embedded controllers. IC Role / Device Role / Timing Role: Tight ±4% output regulation and low ripple (100mVP-P) ensure valid programming thresholds and data integrity. Use Value: Eliminates need for external precision LDO or discrete charge pump circuits - reduces footprint and validation effort. |
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 | 20mA max output, 8µA shutdown current, supports up to 20V input - lacks automatic mode switching and higher output current capability | Better suited for high-input-voltage, ultra-low-power sensor nodes than 2–5V battery systems | Select LTC1144CS8 only when input exceeds 5V or output current ≤20mA suffices |
| LTC1262CS8 | Fixed 5V-to-12V boost converter (not input-flexible), 30mA output, no 2–5V input support - different topology and application scope | Designed for generating 12V bias from 5V rails (e.g., LCD bias), not for general-purpose 5V generation | LTC1262CS8 is not a functional substitute - use only for dedicated 5V→12V conversion needs |
Compared with LTC1144CS8 and LTC1262CS8, the LTC1516IS8#TRPBF uniquely combines 2–5V input flexibility, 50mA output, automatic efficiency-optimized mode switching, and industrial-grade SO-8 packaging - making it the only direct fit for compact, battery-powered 5V supply applications requiring robust regulation and thermal resilience.
Availability
LTC1516IS8#TRPBF is available at Aetrix Electronics and suitable for smart card readers, Li-ion backup supplies, and 2-cell alkaline-powered instrumentation requiring stable component supply, long-lifecycle support, and industrial-temperature performance.
Supply support for LTC1516IS8#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 legacy precision analog and power management portfolio with full datasheet, reliability, and support continuity.
The LTC1516IS8#TRPBF belongs to Linear's micropower switched-capacitor DC/DC converter family, engineered specifically for space- and energy-constrained battery-operated systems where inductor-free 5V generation and sub-µA shutdown are mandatory.
FAQ
What is the maximum continuous output current of the LTC1516IS8#TRPBF?
The LTC1516IS8#TRPBF delivers up to 50mA continuous output current when input voltage is ≥3V and ambient temperature remains within the industrial range (–40°C to +85°C). At VIN ≥2V, the rated output drops to 20mA. This current limit is enforced by internal thermal protection and charge pump drive capability - exceeding it causes efficiency degradation and potential thermal cycling.
Does the LTC1516IS8#TRPBF require external inductors?
No, the LTC1516IS8#TRPBF uses a switched-capacitor (charge pump) architecture and requires only four external capacitors: two 0.22µF flying capacitors (C1, C2) and two 10µF bulk capacitors (CIN at VIN, COUT at VOUT). This eliminates inductors, associated EMI filtering, and layout sensitivity to magnetic fields - simplifying design for compact, low-noise applications.
How does the LTC1516IS8#TRPBF achieve high efficiency at light loads?
The LTC1516IS8#TRPBF achieves >70% efficiency down to 10µA load by modulating the SHDN pin with a 5Hz–100Hz, 95–98% duty cycle signal - forcing periodic wake-up bursts while spending most time in <1µA shutdown. Internally, it also switches between doubler and tripler modes based on VIN and load to minimize switching losses and optimize charge transfer per cycle.
What protection features does the LTC1516IS8#TRPBF include?
The LTC1516IS8#TRPBF integrates short-circuit protection (survives indefinite VOUT-to-GND shorts), thermal shutdown with hysteresis (135°C trip, 115°C recovery), and load disconnect during shutdown. It also features absolute maximum ratings up to 6V on all pins and built-in ESD protection - enabling robust operation in field-deployed battery-powered equipment without external protection circuitry.
Is the LTC1516IS8#TRPBF pin-compatible with other Linear charge pump converters?
No, the LTC1516IS8#TRPBF has a unique 8-pin SO pinout optimized for dual flying capacitor routing and is not pin-compatible with LTC1144, LTC1262, or LTC1550. Its pin functions - including separate C1+/C1– and C2+/C2– terminals - differ fundamentally from single-capacitor or fixed-ratio charge pumps. Layout reuse requires verification against the official LTC1516IS8#TRPBF pin diagram.
LTC1516IS8#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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1516IS8#TRPBF FAQ
1.How can I place an order for LTC1516IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1516IS8#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 LTC1516IS8#TRPBF reliable?
The price and inventory of LTC1516IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1516IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1516IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1516IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1516IS8#TRPBF?
LTC1516IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1516IS8#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 LTC1516IS8#TRPBF?
For technical support, including LTC1516IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1516IS8#TRPBF requirements.
6.How does Aetrix verify that LTC1516IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1516IS8#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 LTC1516IS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1516IS8#TRPBF?
All LTC1516IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1516IS8#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 LTC1516IS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1516IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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