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Analog Devices Inc. LTC1515IS8-3/5#TRPBF
- Part No.:
- LTC1515IS8-3/5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1515IS8-3/5#TRPBF.pdf
- Description:
- IC REG CHARGE PUMP PROG 50MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,202
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Product details
Overview
LTC1515IS8-3/5#TRPBF from Analog Devices (formerly Linear Technology) is a micropower switched capacitor DC/DC converter that provides selectable 3V or 5V regulated output via logic-controlled step-up/step-down operation. It operates from 2V to 10V input, delivers up to 50mA output current, maintains ±4% output regulation, and integrates an open-drain power-on reset (POR) output with 200ms typical delay-used in SIM card power supplies and portable equipment where dual-voltage rail generation and system reset coordination are required.
For engineers reviewing the LTC1515IS8-3/5#TRPBF datasheet, LTC1515IS8-3/5#TRPBF pinout, LTC1515IS8-3/5#TRPBF application, or LTC1515IS8-3/5#TRPBF equivalent, key selection criteria include its 650kHz switching frequency, <1µA shutdown current, SO-8 package compatibility, and daisy-chainable POR output for multi-rail sequencing in space-constrained battery-powered systems.
Technical Context
The LTC1515IS8-3/5#TRPBF uses a charge-pump architecture with automatic mode switching between step-up (voltage doubler) and step-down (gated switch) based on VIN–VOUT differential sensing. Its internal comparator compares feedback against a 1.232V reference and employs hysteresis to control burst-mode operation, generating inherent ~100mVP-P ripple essential for regulation.
It features integrated soft-start (4ms typical VOUT ramp), short-circuit protection (12mA typ limit), overtemperature shutdown (~150°C trip), and logic-compatible 5/3 and SHDN inputs that accept 3V logic across full VIN range. The POR output remains low until VOUT stabilizes within 6.5% of target for ≥200ms, then releases as open-drain signal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Selectable 3V or 5V via 5/3 pin logic level; no external resistors needed |
| Input Voltage Range | 2V to 10V - supports single-cell Li-ion, multi-cell NiCd, and wide-input industrial rails |
| Max Output Current | 50mA at 5V output - sufficient for SIM interface, smart card readers, and local microcontroller rails |
| Quiescent Current | 60µA typical - enables >1-year battery life in always-on low-power monitoring nodes |
| Shutdown Current | <1µA at VIN ≤5V - preserves battery during extended sleep modes |
| Switching Frequency | 650kHz typical - allows use of small 0.22µF flying capacitor and compact 10µF ceramic output caps |
| POR Delay | 200ms typical after VOUT regulation - ensures reliable microcontroller reset timing without external RC |
Pinout & Package
Package: 8-lead plastic SO (SO-8, narrow 0.150"), RoHS-compliant, thermal resistance θJA = 110°C/W, TJMAX = 125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 8) | Regulated output voltage node | Provides selectable 3V/5V rail; requires ≥10µF low-ESR bypass capacitor for ripple control |
| VIN (Pin 7) | Main power input | Accepts 2V–10V; must be bypassed with ≥10µF low-ESR capacitor near pin |
| C1+ (Pin 6) | Flying capacitor positive terminal | Connects to + side of 0.22µF ceramic flying capacitor; critical for charge transfer efficiency |
| C1– (Pin 5) | Flying capacitor negative terminal | Connects to – side of 0.22µF ceramic flying capacitor; completes charge pump loop |
| SHDN (Pin 1) | Active-high shutdown control | Logic high ≥1.6V enables regulator; logic low disconnects load from VIN and reduces ICC to <1µA |
| POR (Pin 2) | Open-drain power-on reset output | Pulls low until VOUT is stable within 6.5% for ≥200ms; requires external pull-up to VOUT |
| 5/3 (Pin 3) | Output voltage select input | High = 5V output; low = 3V output; must not float - tie to VIN or GND if unused |
| GND (Pin 4) | Power and signal ground reference | Must connect to low-impedance ground plane to minimize noise and ensure POR accuracy |
Key Features
| Feature | Design Value |
|---|---|
| Dual-output voltage selection | Hardware-selectable 3V/5V via single logic pin - eliminates need for external DAC or configuration EEPROM |
| Wide input voltage support | 2V–10V operation accommodates aging batteries and unregulated wall adapters without pre-regulation |
| Integrated power-on reset | Open-drain POR with built-in 200ms timer - replaces discrete reset IC and RC network in cost-sensitive designs |
| Soft-start and inrush limiting | 4ms typical VOUT ramp and adaptive output impedance - prevents input supply droop during startup and high ΔVIN–VOUT conditions |
| Low-noise charge-pump topology | Burst-mode regulation with controlled 100mVP-P ripple - avoids EMI issues common in inductor-based converters |
| Robust protection suite | Short-circuit current limiting (12mA typ) and thermal shutdown (~150°C) - enables reliable operation in sealed or thermally constrained enclosures |
Applications
| GSM SIM Card Interface | Smart Card Reader Power |
|---|---|
Use Scenario: Powering ISO 7816-compliant SIM cards in mobile handsets requiring dynamic 3V/5V selection per card specification. IC Role / Device Role / Timing Role: Primary regulated voltage source with logic-selectable output and synchronized POR signal for secure element initialization. Use Value: Eliminates need for separate LDOs and reset generators; 50mA output supports simultaneous card activation and data transfer. |
Use Scenario: Providing programmable VCC to contact-based smart cards in point-of-sale terminals and access control readers. IC Role / Device Role / Timing Role: Dual-voltage DC/DC converter with POR coordination to meet ISO 7816-3 power-up timing requirements (t0, t1). Use Value: Enables single-board support for legacy 5V and modern 3V smart cards without hardware redesign or jumper settings. |
| Portable Medical Sensor Node | Industrial Handheld Scanner |
Use Scenario: Generating clean 3V rail for ultra-low-power MCU and analog front-end in battery-operated glucose monitors or pulse oximeters. IC Role / Device Role / Timing Role: Micropower step-down/step-up converter with POR-driven system wake-up sequence upon battery insertion. Use Value: 60µA quiescent current extends CR2032 battery life beyond 2 years in standby; SO-8 footprint fits sub-20mm² PCB area. |
Use Scenario: Supplying 5V logic rail and 3V sensor bias from a 7.4V Li-Po pack in rugged barcode scanners with frequent power cycling. IC Role / Device Role / Timing Role: Input-flexible DC/DC converter with daisy-chainable POR for coordinated reset of imager, decoder, and Bluetooth modules. Use Value: 2V–10V input range tolerates discharged battery (≥2.5V) while maintaining 5V output; <1µA shutdown current prevents pack drain during storage. |
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 |
|---|---|---|---|
| LTC1515CS8-3/5 | Same functionality and pinout; commercial temperature range (0°C to 70°C) vs industrial (–40°C to 85°C) | Suitable for consumer-grade portable devices but not automotive or industrial environments | Select when operating ambient stays within 0°C–70°C and cost sensitivity outweighs extended temp qualification |
| LTC1515IS8-3.3/5 | Identical package and pinout; supports 3.3V/5V selection instead of 3V/5V; FB pin omitted, 5/3 pin repurposed | Required for systems needing 3.3V I/O compatibility (e.g., ARM Cortex-M peripherals) rather than legacy 3V SIM cards | Choose only when 3.3V output is mandatory; not interchangeable due to different internal resistor network and missing FB capability |
Compared with LTC1515IS8-3/5#TRPBF, the LTC1515CS8-3/5 offers identical electrical performance at lower cost but lacks industrial temperature rating, while the LTC1515IS8-3.3/5 provides 3.3V instead of 3V output - making it unsuitable as a drop-in replacement but viable for new designs targeting modern low-voltage interfaces.
Availability
LTC1515IS8-3/5#TRPBF is available at Aetrix Electronics and suitable for GSM SIM interfaces, smart card readers, and portable medical sensors requiring stable component supply, long-term lifecycle assurance, and industrial-temperature-grade reliability.
Supply support for LTC1515IS8-3/5#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 full technical and manufacturing continuity for legacy Linear power products including the LTC1515 series.
The LTC1515 family was designed specifically for low-power, space-constrained applications requiring dual-voltage generation and integrated power sequencing - notably SIM card power, smart card readers, and portable instrumentation.
FAQ
What is the operating temperature range for the LTC1515IS8-3/5#TRPBF?
The LTC1515IS8-3/5#TRPBF is rated for industrial temperature operation from –40°C to +85°C. This range is confirmed in the Absolute Maximum Ratings table and applies across all specified electrical characteristics including output regulation, POR delay, and shutdown current. The device's thermal shutdown activates at ~150°C junction temperature, providing margin under sustained high-load conditions within the rated ambient range.
Can the LTC1515IS8-3/5#TRPBF generate 3.3V output?
No, the LTC1515IS8-3/5#TRPBF is factory-configured for 3V/5V selection only. Its internal resistor network and 5/3 pin logic are optimized for those two voltages. For 3.3V/5V output, the correct part is LTC1515IS8-3.3/5, which uses a different internal divider and omits the FB pin - making it functionally and electrically distinct from the LTC1515IS8-3/5#TRPBF.
How does the POR output behave during shutdown?
During shutdown (SHDN = low), the POR pin of the LTC1515IS8-3/5#TRPBF is actively pulled low regardless of VOUT state. This behavior is explicitly documented in the PIN FUNCTIONS section and ensures deterministic system reset during intentional power-down sequences - unlike POR release during normal operation, which requires VOUT to stabilize within 6.5% for ≥200ms.
What external components are required for basic operation of the LTC1515IS8-3/5#TRPBF?
The LTC1515IS8-3/5#TRPBF requires exactly three external capacitors: a 0.22µF ceramic flying capacitor (C1) between C1+ and C1–, a ≥10µF low-ESR input capacitor (CIN) from VIN to GND, and a ≥10µF low-ESR output capacitor (COUT) from VOUT to GND. No resistors or diodes are needed - the 5/3 pin directly selects 3V or 5V output without external feedback network.
Is the LTC1515IS8-3/5#TRPBF pin-compatible with the LTC1515CS8-3/5?
Yes, the LTC1515IS8-3/5#TRPBF and LTC1515CS8-3/5 share identical SO-8 pinout, pin functions, and electrical specifications - differing only in temperature grade (industrial vs commercial) and part marking. Both support the same 3V/5V selection, POR timing, and shutdown behavior, enabling direct substitution in layouts where ambient temperature remains within 0°C–70°C.
LTC1515IS8-3/5#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/Step-Down
- Output Configuration:
- Positive
- Topology:
- Charge Pump
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- 3V, 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 50mA
- Frequency - Switching:
- 650kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1515IS8-3/5#TRPBF FAQ
1.How can I place an order for LTC1515IS8-3/5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1515IS8-3/5#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 LTC1515IS8-3/5#TRPBF reliable?
The price and inventory of LTC1515IS8-3/5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1515IS8-3/5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1515IS8-3/5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1515IS8-3/5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1515IS8-3/5#TRPBF?
LTC1515IS8-3/5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1515IS8-3/5#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 LTC1515IS8-3/5#TRPBF?
For technical support, including LTC1515IS8-3/5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1515IS8-3/5#TRPBF requirements.
6.How does Aetrix verify that LTC1515IS8-3/5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1515IS8-3/5#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 LTC1515IS8-3/5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1515IS8-3/5#TRPBF?
All LTC1515IS8-3/5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1515IS8-3/5#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 LTC1515IS8-3/5#TRPBF part is unused and in its original packaging.
Return procedure for LTC1515IS8-3/5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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