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Analog Devices Inc. LTC1516IS8#PBF
- Part No.:
- LTC1516IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1516IS8#PBF.pdf
- Description:
- IC REG CHARGE PUMP 5V 50MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
LTC1516IS8#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 operating current with <1µA in shutdown - enabling multi-year operation from coin cells. Its role is to replace inductor-based boost converters in space-constrained, light-load applications such as smart card readers and Li-ion backup supplies.
For engineers reviewing the LTC1516IS8#PBF datasheet, LTC1516IS8#PBF pinout, LTC1516IS8#PBF application, or LTC1516IS8#PBF equivalent, key selection criteria include ultralow quiescent current, absence of inductors, thermal/short-circuit protection, 8-pin SO package compatibility, and dual-mode (doubler/tripler) efficiency optimization across varying input voltage and load conditions.
Technical Context
The LTC1516IS8#PBF uses a switched-capacitor architecture with two independent flying capacitors (C1, C2) and internal 600kHz nonoverlapping clock generation. Regulation is achieved via three comparators (COMP1–COMP3) that dynamically select between doubler and tripler modes based on VIN and output droop - COMP1 forces tripler mode below 2.55V, while COMP3 triggers temporary tripler activation under heavy load in doubler mode.
It integrates CMOS-level active-high SHDN control that fully disconnects VOUT from VIN during shutdown, plus thermal shutdown (trip at 135°C, hysteresis to 115°C) and indefinite VOUT-to-GND short survival. The internal resistor divider draws only 1.5µA from VOUT, supporting ultralow-IQ operation when modulated via SHDN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5V ±4% - tight regulation enables direct powering of 5V logic, Flash memory, and USB-peripheral interfaces without external LDO post-regulation. |
| Input Voltage Range | 2V to 5V - supports single Li-ion (3.0–4.2V), two alkaline/NiMH (2.0–3.2V), or 3.3V system rails as input sources. |
| Supply Current (No Load) | 12µA typical - enables >10-year battery life in always-on monitoring nodes powered by CR2032 cells. |
| Shutdown Current | <1µA - ensures negligible self-discharge in long-term storage or sleep-state applications. |
| Max Output Current | 20mA at VIN ≥ 2V; 50mA at VIN ≥ 3V - sufficient for smart card ICs, EEPROM programmers, and low-power microcontroller peripherals. |
| Switching Frequency | 600kHz - allows use of small 0.22µF ceramic flying capacitors and minimizes EMI compared to lower-frequency charge pumps. |
| Output Ripple | 100mVP-P at full load - manageable with standard 10µF low-ESR tantalum or ceramic output capacitors; reduced further with 22µF+ COUT. |
Pinout & Package
Package: 8-pin plastic SO (narrow, 0.150-inch width), RoHS-compliant, industrial temperature range (–40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C1– (Pin 8) | Flying capacitor 1, negative terminal | Connects to ground side of first flying capacitor; must be decoupled near IC to minimize high-frequency loop inductance. |
| SHDN (Pin 7) | Active-high CMOS shutdown control | Drives high to disable all internal circuitry and disconnect VOUT from VIN; threshold ≈ VIN/2 but tolerant of logic levels beyond VIN. |
| GND (Pin 6) | Power and signal reference ground | Single-point return path for flying caps, input/output caps, and internal regulators; requires solid ground plane connection. |
| C2– (Pin 5) | Flying capacitor 2, negative terminal | Ground node for second flying capacitor; kept separate from C1– in paralleled configurations to prevent cross-talk. |
| C1+ (Pin 1) | Flying capacitor 1, positive terminal | Switched node connecting C1 to VIN during charge phase and to C2/VOUT during discharge phase in tripler mode. |
| VIN (Pin 2) | Main input supply (2V–5V) | Source for both charge pump energy and internal bias; requires low-impedance 10µF bypass capacitor due to 500mA inrush at startup. |
| VOUT (Pin 3) | Regulated 5V output | Delivers stable 5V to load; disconnected from VIN during shutdown; exhibits 100mVP-P ripple requiring proper COUT selection. |
| C2+ (Pin 4) | Flying capacitor 2, positive terminal | Switched node used in both doubler (with C2 only) and tripler (C1+C2 stacked) modes; critical for voltage multiplication timing. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode charge pump (doubler/tripler) | Automatically selects optimal topology based on VIN and load to maintain >70% efficiency down to 10µA output current. |
| No inductors required | Enables ultra-compact 0.1 in² PCB footprint using only four external capacitors - ideal for thin-profile portable devices. |
| Thermal and short-circuit protection | Survives continuous VOUT-to-GND shorts with automatic thermal cycling (135°C trip / 115°C recovery), no latch-up or damage. |
| Ultralow shutdown current | <1µA draw from VIN in shutdown - eliminates need for external load switches in battery-critical systems. |
| Internal 600kHz oscillator | Eliminates external timing components; fixed frequency simplifies EMI filtering and avoids subharmonic interference with system clocks. |
Applications
| 2-Cell Alkaline/NiMH to 5V Conversion | Li-Ion Battery Backup Supply |
|---|---|
|
Use Scenario: Powering 5V USB peripherals or legacy logic from two AA/AAA batteries (2.0–3.2V) in handheld test equipment. IC Role / Device Role / Timing Role: Primary regulated 5V DC/DC converter replacing inefficient linear regulators or bulky inductor-based boosters. Use Value: Extends battery life by >3× vs linear solutions and achieves >75% efficiency at 10–20mA loads without magnetic components. |
Use Scenario: Maintaining 5V rail for real-time clock and SRAM during main power failure in embedded controllers with single-cell Li-ion primary supply. IC Role / Device Role / Timing Role: Standby power manager that activates only when main supply drops below 3.3V, drawing <1µA in quiescent state. Use Value: Enables >1-year backup runtime on 100mAh Li-ion cell while ensuring reliable 5V reset signaling during brownout events. |
| Smart Card Reader Power | 5V Flash Memory Programming |
|
Use Scenario: Providing ISO 7816-compliant 5V VCC to contact-based smart cards (e.g., SIM, EMV) in GSM handsets and point-of-sale terminals. IC Role / Device Role / Timing Role: Dedicated card interface supply with fast turn-on (<500µs), short-circuit robustness, and precise ±4% regulation. Use Value: Meets EMV Level 1 electrical requirements and survives repeated card insertion/removal faults without system reset. |
Use Scenario: Generating clean 5V programming voltage for parallel NOR/NAND Flash chips during firmware update in industrial gateways. IC Role / Device Role / Timing Role: High-accuracy, low-noise auxiliary supply isolated from noisy digital domains, synchronized to programming command timing. Use Value: Prevents bit errors during write/erase cycles by maintaining stable 5V ±4% under transient 30mA load steps with <100mV ripple. |
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; includes micropower shutdown (8µA); supports up to 20V input but lacks tripler mode and 50mA capability. | Better suited for higher-input-voltage, lower-current applications (e.g., 9V battery systems); not recommended for 2–3V inputs needing >20mA. | Select LTC1144 only if input exceeds 5V or ultralow 8µA shutdown current is prioritized over output drive capability. |
| LTC1262CS8#PBF | Fixed 5V-to-12V conversion (not adjustable); 30mA output; no input voltage flexibility - requires stable 5V input source. | Designed for level-shifting applications (e.g., RS-232 drivers), not for stepping up low-voltage batteries. | Choose LTC1262 only when boosting an existing 5V rail to 12V is required; incompatible with 2–5V direct battery input use cases. |
Compared with LTC1516IS8#PBF, LTC1144 offers higher input voltage tolerance but lower output current and no dynamic mode switching, while LTC1262 serves a completely different voltage-up conversion purpose and cannot replace LTC1516IS8#PBF in battery-fed 2–5V-to-5V applications.
Availability
LTC1516IS8#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 across industrial temperature ranges and long-lifecycle programs.
Supply support for LTC1516IS8#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 technical and manufacturing continuity for legacy Linear products including the LTC series.
The LTC1516IS8#PBF belongs to Linear's micropower DC/DC converter product line, engineered specifically for ultra-low-power, inductorless voltage boosting in portable and battery-critical systems where size, efficiency, and reliability outweigh cost sensitivity.
FAQ
What is the maximum continuous output current supported by the LTC1516IS8#PBF?
The LTC1516IS8#PBF delivers up to 20mA continuously when input voltage is ≥2V, and up to 50mA when input voltage is ≥3V. This stepped current capability reflects its adaptive doubler/tripler architecture - at lower VIN, internal regulation limits output to preserve stability and efficiency. Exceeding these values risks dropout or thermal shutdown.
Does the LTC1516IS8#PBF require external inductors?
No, the LTC1516IS8#PBF is a switched-capacitor charge pump and requires no inductors. It operates using two external flying capacitors (typically 0.22µF) and input/output bulk capacitors (10µF each). This eliminates magnetic components, reduces EMI, and enables ultra-compact layouts - a defining feature of the LTC1516IS8#PBF design.
How does the LTC1516IS8#PBF achieve high efficiency at very light loads (e.g., 10µA)?
The LTC1516IS8#PBF maintains >70% efficiency down to 10µA by modulating the SHDN pin with a low-duty-cycle signal (e.g., 100Hz, 98% off-time), forcing periodic wake-ups to replenish VOUT. During off periods, it draws <1µA, and each 200µs on-pulse delivers just enough charge to sustain regulation - a technique explicitly validated in the LTC1516IS8#PBF datasheet Figure 3 and F04b.
Can multiple LTC1516IS8#PBF devices be paralleled to increase output current?
Yes, two or more LTC1516IS8#PBF units can be paralleled: tie VIN, VOUT, GND, and SHDN together, but keep C1+ / C1– / C2+ / C2– pins separate per device. Output current scales approximately linearly (e.g., two units → ~100mA at VIN ≥ 3V), though layout symmetry and individual capacitor matching are critical to avoid current imbalance and ripple coupling.
What protection features are integrated into the LTC1516IS8#PBF?
The LTC1516IS8#PBF includes short-circuit protection (survives indefinite VOUT-to-GND fault), thermal shutdown (135°C trip with 20°C hysteresis), and shutdown-mode load disconnection. It also features robust ESD tolerance and absolute maximum ratings that allow safe operation with input transients up to 6V - all confirmed in the LTC1516IS8#PBF Absolute Maximum Ratings table and Applications Information section.
LTC1516IS8#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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1516IS8#PBF FAQ
1.How can I place an order for LTC1516IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1516IS8#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 LTC1516IS8#PBF reliable?
The price and inventory of LTC1516IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1516IS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1516IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1516IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1516IS8#PBF?
LTC1516IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1516IS8#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 LTC1516IS8#PBF?
For technical support, including LTC1516IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1516IS8#PBF requirements.
6.How does Aetrix verify that LTC1516IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1516IS8#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 LTC1516IS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1516IS8#PBF?
All LTC1516IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1516IS8#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 LTC1516IS8#PBF part is unused and in its original packaging.
Return procedure for LTC1516IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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