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Analog Devices Inc. LTC1515IS8#PBF
- Part No.:
- LTC1515IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1515IS8#PBF.pdf
- Description:
- IC REG CHARGE PUMP ADJ 50MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,451
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Product details
Overview
LTC1515IS8#PBF from Analog Devices (formerly Linear Technology) is a micropower switched capacitor DC/DC converter supporting step-up or step-down voltage conversion with programmable 3.3V/5V output, ±4% regulation over 2V–10V input, and integrated open-drain power-on reset (POR). It delivers up to 50mA output current, operates at 650kHz, and targets SIM interface and smart card power in portable equipment.
For engineers reviewing the LTC1515IS8#PBF datasheet, LTC1515IS8#PBF pinout, LTC1515IS8#PBF application, or LTC1515IS8#PBF equivalent, key selection criteria include input voltage range compatibility (2V–10V), dual-output voltage selection (3.3V/5V via logic pin), shutdown current (<1µA), soft-start timing (4ms), and SO-8 thermal performance (θJA = 110°C/W).
Technical Context
The LTC1515IS8#PBF uses a unique charge pump architecture that automatically selects step-up (voltage doubler) or step-down (gated switch) mode based on VIN–VOUT differential sensing. Internal circuitry dynamically adjusts effective output resistance to limit inrush current and maintain regulation across wide input ranges.
It integrates a 1.232V internal reference, comparator with hysteresis for burst-mode control, 650kHz oscillator, and open-drain POR output with 200ms (typ) delay after VOUT reaches ±6.5% of regulation. The 5/3 pin selects between 3.3V and 5V outputs using internal resistor networks - no external feedback divider required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Options | 3.3V or 5V selectable via logic-level 5/3 pin; no external resistors needed |
| Input Voltage Range | 2V to 10V - supports single-cell Li-ion, multi-cell NiCd, and wide-input portable rails |
| Max Output Current | 50mA - sufficient for SIM card interfaces, smart card readers, and local microcontroller supplies |
| Regulation Accuracy | ±4% over full temperature and load range - ensures stable logic-level supply under varying conditions |
| Switching Frequency | 650kHz (typ) - enables use of small 0.22µF flying capacitor and compact 10µF output capacitance |
| Shutdown Current | <1µA at VIN ≤ 5V - extends battery life in always-on low-power standby modes |
| POR Delay | 200ms (typ) after VOUT enters regulation - provides reliable system reset timing for microcontrollers |
Pinout & Package
Package: 8-lead plastic SO (SO-8, narrow 0.150"), JEDEC MS-012, θJA = 110°C/W, TJMAX = 125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SHDN | Shutdown control input | Logic-high (≥1.6V) enables operation; logic-low disables converter and disconnects load from VIN |
| 2 - POR | Open-drain power-on reset output | Pulls low during power-up, shutdown, or until VOUT stabilizes within ±6.5% for ≥200ms; requires external pull-up |
| 3 - 5/3 | Output voltage select input | High = 5V output; low = 3.3V output; must not float - tie to VIN or GND if unused |
| 4 - GND | Ground reference | Primary return path for charge pump, regulator, and POR; connect to low-impedance ground plane |
| 5 - C1– | Flying capacitor negative terminal | Connects to negative side of 0.22µF ceramic flying capacitor; critical for charge transfer efficiency |
| 6 - C1+ | Flying capacitor positive terminal | Connects to positive side of 0.22µF ceramic flying capacitor; forms switched-capacitor energy transfer path |
| 7 - VIN | Input supply voltage | Accepts 2V–10V; bypass with ≥10µF low-ESR capacitor placed adjacent to pin |
| 8 - VOUT | Regulated output voltage | Delivers selected 3.3V or 5V; bypass with ≥10µF low-ESR capacitor; supports up to 50mA continuous load |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode charge pump | Automatically switches between step-up (doubler) and step-down (gated switch) based on VIN–VOUT differential - eliminates manual topology selection |
| Programmable output selection | 3.3V/5V set by logic level on 5/3 pin - removes need for external feedback resistors and simplifies BOM |
| Soft-start turn-on time | 4ms typical VOUT ramp from 0V to 5V - limits inrush to ~12.5mA with 10µF COUT, preventing input rail collapse |
| Thermal & short-circuit protection | Shuts down at ~150°C junction temp; limits short-circuit current to 12mA (typ) - enables robust operation in unattended portable systems |
| Low-noise POR with timer | Open-drain POR output with 200ms (typ) release delay after regulation - provides deterministic reset timing without external RC networks |
Applications
| SIM Interface in GSM Cellular Telephones | Smart Card Readers |
|---|---|
Use Scenario: Powering SIM card interface circuitry in dual-voltage GSM handsets requiring dynamic switching between 3.3V (UICC) and 5V (legacy SIM) modes. IC Role / Device Role / Timing Role: Primary regulated power source delivering precise 3.3V or 5V from variable battery input (2.7V–4.4V), with POR signal synchronizing SIM initialization. Use Value: Eliminates need for discrete LDOs or manual voltage selection; 50mA output supports full SIM active current; <1µA shutdown extends standby time. | Use Scenario: Providing compliant 3.3V or 5V supply to ISO 7816-compliant smart cards in handheld readers, point-of-sale terminals, and access control devices. IC Role / Device Role / Timing Role: Single-chip dual-voltage power manager with integrated POR, enabling safe card insertion detection and reset sequencing per ISO 7816-3 timing requirements. Use Value: Meets smart card voltage tolerance (±4%) and startup timing; soft-start prevents card communication glitches; SO-8 package fits compact reader PCBs. |
| Local Power Supplies | Portable Equipment |
Use Scenario: Generating clean 3.3V or 5V rails for microcontrollers, sensors, or RF transceivers in space-constrained embedded systems where main supply is unstable or out-of-range. IC Role / Device Role / Timing Role: Local DC/DC regulator converting intermediate battery or adapter voltage (e.g., 3.6V Li-ion or 9V wall adapter) to logic-compatible output with POR coordination. Use Value: Wide 2V–10V input accommodates aging batteries and multiple input sources; 60µA quiescent current minimizes idle drain; SO-8 allows high-density layout. | Use Scenario: Powering subsystems in battery-operated portable instruments (e.g., handheld meters, medical sensors) requiring long runtime and dual-voltage flexibility. IC Role / Device Role / Timing Role: Micropower voltage translator enabling operation across diverse battery chemistries (Li-ion, NiCd, alkaline) while maintaining regulated output and system reset integrity. Use Value: <1µA shutdown current preserves battery during storage; ±4% regulation ensures consistent ADC reference or sensor bias; 650kHz switching avoids audible noise in sensitive analog sections. |
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 |
|---|---|---|---|
| LTC1515CS8-3.3/5 | Same functionality and pinout; commercial temperature range (0°C to 70°C) vs industrial (–40°C to 85°C) | Suitable for non-extended-temperature consumer or lab-grade portable devices | Select when ambient operating temperature remains within 0°C–70°C and cost sensitivity outweighs industrial qualification needs |
| LTC1516IS8#PBF | Fixed 5V output only; 20mA max output (VIN ≥ 2V) or 50mA (VIN ≥ 3V); no 3.3V option or POR output | Applicable where only 5V is required and reset signaling is handled externally | Choose when design requires only 5V and can omit POR; lower quiescent current (6µA) but lacks voltage flexibility and reset integration |
Compared with LTC1515IS8#PBF, LTC1515CS8-3.3/5 offers identical electrical behavior but reduced temperature margin, while LTC1516IS8#PBF trades dual-voltage selection and POR for lower IQ and simpler control - neither is pin-compatible drop-in replacements, but both serve overlapping portable power niches with distinct trade-offs.
Availability
LTC1515IS8#PBF is available at Aetrix Electronics and suitable for SIM interface in GSM cellular telephones, smart card readers, and local power supplies requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LTC1515IS8#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's legacy ICs emphasize high accuracy, low power, and robustness in demanding environments.
The LTC1515 series belongs to Linear's micropower switched-capacitor DC/DC converter product line, designed specifically for battery-powered portable systems needing flexible, low-quiescent, dual-voltage power with integrated reset functionality.
FAQ
What output voltages does the LTC1515IS8#PBF support, and how are they selected?
The LTC1515IS8#PBF supports 3.3V or 5V outputs, selected by the logic state of the 5/3 pin: high = 5V, low = 3.3V. This is implemented via internal resistor networks - no external feedback components are required. The part does not support adjustable output or 3V variants; those require different suffixes (e.g., LTC1515IS8-3/5). The LTC1515IS8#PBF is specifically the 3.3V/5V version in industrial-grade SO-8 packaging.
What is the maximum continuous output current capability of the LTC1515IS8#PBF?
The LTC1515IS8#PBF delivers up to 50mA continuous output current when operating within specified conditions: VIN ≥ 3V for 5V output, VIN ≥ 3V for 3.3V output, and with proper capacitor selection (COUT ≥ 10µF, low ESR). At lower input voltages (e.g., VIN = 2.7V), output current may be limited to 15mA to maintain regulation. The LTC1515IS8#PBF includes short-circuit protection limiting fault current to 12mA (typ), ensuring safe operation under overload.
How does the power-on reset (POR) function work on the LTC1515IS8#PBF?
The POR pin on the LTC1515IS8#PBF is an open-drain output that remains low during initial power-up, shutdown, or whenever VOUT deviates more than ±6.5% from its target value. Once VOUT stabilizes within regulation, an internal timer initiates a 200ms (typ) delay before releasing POR high. An external pull-up resistor (typically to VOUT) is required. This POR behavior is integral to the LTC1515IS8#PBF's architecture and provides deterministic reset timing without external components.
Can the LTC1515IS8#PBF operate from a 2V input supply?
Yes, the LTC1515IS8#PBF supports a minimum input voltage of 2V, but output capability depends on selected voltage and load. For 3.3V output, it regulates down to 2V input at ≤15mA load; for 5V output, minimum VIN is 2.7V. Below these thresholds, regulation is not guaranteed. The LTC1515IS8#PBF's wide 2V–10V range enables use with single-cell LiFePO₄, depleted alkaline, or multi-cell NiCd sources - a key advantage over fixed-input regulators.
What capacitors are required for basic operation of the LTC1515IS8#PBF?
The LTC1515IS8#PBF requires three external capacitors: a 0.22µF ceramic flying capacitor (C1) between C1+ and C1– pins; a ≥10µF low-ESR input capacitor (CIN) from VIN to GND; and a ≥10µF low-ESR output capacitor (COUT) from VOUT to GND. For VIN > 8V, COUT should be increased to 22µF or more to maintain ≤100mV ripple. All capacitors must be placed close to their respective pins. These values are mandatory for stable operation of the LTC1515IS8#PBF and are specified in its absolute minimum configuration.
LTC1515IS8#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/Step-Down
- Output Configuration:
- Positive
- Topology:
- Charge Pump
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- 1.232V
- Voltage - Output (Max):
- 20V
- 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#PBF FAQ
1.How can I place an order for LTC1515IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1515IS8#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 LTC1515IS8#PBF reliable?
The price and inventory of LTC1515IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1515IS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1515IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1515IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1515IS8#PBF?
LTC1515IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1515IS8#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 LTC1515IS8#PBF?
For technical support, including LTC1515IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1515IS8#PBF requirements.
6.How does Aetrix verify that LTC1515IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1515IS8#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 LTC1515IS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1515IS8#PBF?
All LTC1515IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1515IS8#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 LTC1515IS8#PBF part is unused and in its original packaging.
Return procedure for LTC1515IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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