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Analog Devices Inc. LTC1515CS8-3/5#TRPBF
- Part No.:
- LTC1515CS8-3/5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1515CS8-3/5#TRPBF.pdf
- Description:
- IC REG CHARGE PUMP PROG 50MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,561
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Product details
Overview
LTC1515CS8-3/5#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 daisy-chained operation, supports 2V–10V input, delivers up to 50mA, and integrates open-drain power-on reset - used in GSM SIM interface power rails.
For engineers reviewing the LTC1515CS8-3/5#TRPBF datasheet, LTC1515CS8-3/5#TRPBF pinout, LTC1515CS8-3/5#TRPBF application, or LTC1515CS8-3/5#TRPBF equivalent, key selection criteria include input voltage range compatibility, programmable dual-output voltage selection, shutdown current <1µA, 650kHz switching frequency, and SO-8 thermal performance (θJA = 110°C/W).
Technical Context
The LTC1515CS8-3/5#TRPBF implements a step-up/step-down charge pump architecture with automatic mode switching based on VIN–VOUT differential sensing. It uses internal resistor networks and a logic-controlled 5/3 pin to select between 3V and 5V outputs without external feedback components.
Regulation relies on comparator hysteresis (±4% typical), internal 1.232V reference, and soft-start circuitry limiting turn-on time to 4ms. POR activation requires VOUT to remain within ±6.5% of regulation for ≥200ms before release.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Selectable 3V or 5V via 5/3 pin logic level; no external resistors required |
| Input Voltage Range | 2V to 10V - supports single-cell Li-ion, multi-cell NiCd, and wide industrial supply rails |
| Max Output Current | 50mA at 5V output - sufficient for SIM card, smart card, and local microcontroller rail generation |
| Switching Frequency | 650kHz typical - enables use of small 0.22µF flying capacitor and reduces EMI filtering burden |
| Quiescent Current | 60µA typical - extends battery life in portable equipment during active operation |
| Shutdown Current | <1µA at VIN ≤ 5V - critical for ultra-low-power standby modes in handheld devices |
| Power-On Reset Delay | 200ms typical after VOUT regulation - ensures reliable microcontroller initialization timing |
Pinout & Package
Package: 8-lead plastic SO (SO-8, narrow 0.150", θJA = 110°C/W). RoHS-compliant, tape-and-reel (#TRPBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SHDN | Shutdown control input | Logic high (≥1.6V) enables regulator; logic low disables output and reduces ICC to <1µA |
| 2 - POR | Open-drain power-on reset output | Pulls low until VOUT stabilizes within ±6.5% for ≥200ms; requires external pull-up to VOUT |
| 3 - 5/3 | Output voltage select input | High = 5V output; low = 3V output; must not float - tie to VIN or GND if unused |
| 4 - GND | Ground reference | Primary return path for charge pump, control logic, 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 core of switched-capacitor topology |
| 7 - VIN | Input supply voltage | Accepts 2V–10V; bypass with ≥10µF low-ESR capacitor adjacent to pin to suppress ripple and inrush |
| 8 - VOUT | Regulated output voltage | Delivers selected 3V or 5V; bypass with ≥10µF low-ESR capacitor to maintain ≤100mVP-P ripple |
Key Features
| Feature | Design Value |
|---|---|
| Dual-output voltage selection | Hardware-selectable 3V/5V via single logic pin - eliminates need for external feedback network or configuration EEPROM |
| Wide-input-range charge pump | Operates from 2V to 10V input while maintaining ±4% regulation - supports legacy and emerging battery chemistries |
| Integrated power-on reset | Open-drain POR with 200ms delay ensures deterministic microcontroller boot sequencing without external supervisor IC |
| Soft-start current limiting | 4ms controlled VOUT ramp limits inrush to ~12.5mA into 10µF - prevents brownout of upstream regulators during startup |
| Thermal & short-circuit protection | Shuts down at ~150°C junction temperature and limits short-circuit current to 12mA typ - enables robust field operation |
Applications
| GSM SIM Interface Power | Smart Card Reader Supply |
|---|---|
Use Scenario: Powering SIM cards in cellular handsets requiring dynamic 3V/5V selection per card standard. IC Role / Device Role / Timing Role: Primary regulated DC/DC converter generating SIM VCC rail with logic-selectable voltage and POR-synchronized enable. Use Value: Eliminates discrete LDO + supervisor combo; reduces BOM count by 3 parts and saves 12mm² PCB area. | Use Scenario: Providing compliant 3V/5V power to ISO 7816 smart cards in point-of-sale terminals and access control readers. IC Role / Device Role / Timing Role: Standalone programmable supply with POR signaling to host MCU for card insertion detection and reset coordination. Use Value: Meets ISO 7816-3 voltage tolerance (±5%) and timing requirements (treset ≤ 400ms) without external timing components. |
| Portable Equipment Local Rail | Low-Power Microcontroller Core Supply |
Use Scenario: Generating clean 5V auxiliary rail from variable battery input (e.g., 2.7–4.2V Li-ion) in handheld medical or IoT sensors. IC Role / Device Role / Timing Role: Efficient step-up/step-down converter delivering stable 5V to analog front-end or RF transceiver with minimal quiescent draw. Use Value: Achieves >80% efficiency at 10mA load across full VIN range - extends battery runtime by 3.2 hours vs. linear regulator. | Use Scenario: Supplying 3V core voltage to ultra-low-power MCUs (e.g., ARM Cortex-M0+) in sleep-wake cycling applications. IC Role / Device Role / Timing Role: Low-noise, low-IQ supply with integrated POR enabling precise wake-up timing and eliminating external reset IC. Use Value: Shutdown current <1µA allows 10-year shelf life on coin cell; POR delay matches MCU tPU specification exactly. |
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#TRPBF | Offers 3.3V/5V selection instead of 3V/5V; identical pinout, package, and electrical specs otherwise | Suitable where 3.3V logic compatibility is required over legacy 3V SIM standards | Select when system requires 3.3V nominal I/O voltage instead of 3V; no layout changes needed |
| LTC1516ES5#TRMPBF | SOT-23-5 package; fixed 5V output only; 20mA max output; 6µA quiescent current | Targeted at space-constrained, single-rail applications where 3V option and higher current are unnecessary | Choose for ultra-small footprint and lowest IQ where dual-voltage capability and 50mA drive are not required |
Compared with LTC1515CS8-3/5#TRPBF, the LTC1515CS8-3.3/5#TRPBF provides identical functionality with shifted voltage option, while the LTC1516ES5#TRMPBF trades programmability and output current for extreme miniaturization and lower quiescent draw - making each suitable for distinct subsystem power architectures.
Availability
LTC1515CS8-3/5#TRPBF is available at Aetrix Electronics and suitable for GSM SIM interfaces, smart card readers, portable equipment local rails, and low-power microcontroller core supplies requiring stable component supply across extended production lifecycles.
Supply support for LTC1515CS8-3/5#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 supply chain continuity for all Linear power management products.
The LTC1515 series belongs to Linear's micropower switched-capacitor DC/DC converter family, designed specifically for battery-powered portable systems requiring dual-voltage programmability, ultra-low quiescent current, and integrated power sequencing.
FAQ
What is the function of the 5/3 pin on the LTC1515CS8-3/5#TRPBF?
The 5/3 pin on the LTC1515CS8-3/5#TRPBF selects the regulated output voltage: a logic high (≥1.6V) configures VOUT to 5V, while a logic low (≤1.0V) configures it to 3V. This pin must not be left floating - tie to VIN or GND if unused. The LTC1515CS8-3/5#TRPBF uses internal resistor networks, so no external feedback components are needed for this selection.
Does the LTC1515CS8-3/5#TRPBF require external capacitors, and what values are recommended?
Yes, the LTC1515CS8-3/5#TRPBF requires three external capacitors: a 0.22µF ceramic flying capacitor (C1) between C1+ and C1–, and ≥10µF low-ESR input (CIN) and output (COUT) capacitors. For VIN > 8V, COUT should be ≥22µF to maintain ≤100mVP-P ripple. All capacitors must be placed close to their respective pins for optimal noise suppression and regulation stability.
How does the power-on reset (POR) feature of the LTC1515CS8-3/5#TRPBF operate?
The POR pin on the LTC1515CS8-3/5#TRPBF is an open-drain output that remains low until VOUT reaches and sustains regulation within ±6.5% for ≥200ms (typical). It pulls low again during shutdown or power loss. An external pull-up resistor to VOUT is required. This behavior ensures reliable microcontroller reset timing without additional supervision circuitry - a key design benefit of the LTC1515CS8-3/5#TRPBF.
Can the LTC1515CS8-3/5#TRPBF operate with input voltages below 2.7V?
Yes, the LTC1515CS8-3/5#TRPBF supports VIN as low as 2.0V for 3V/3.3V output configurations and 2.7V for 5V output, per Electrical Characteristics table. At 2.0V input, it delivers regulated 3V output up to 50mA. Operation below 2.0V is outside specification and may result in loss of regulation or increased ripple - the LTC1515CS8-3/5#TRPBF is not characterized for sub-2.0V operation.
Is the LTC1515CS8-3/5#TRPBF pin-compatible with other parts in the LTC1515 family?
Yes, all LTC1515 variants in SO-8 package - including LTC1515CS8-3/5#TRPBF, LTC1515CS8-3.3/5#TRPBF, and LTC1515IS8-3/5#TRPBF - share identical pinout, footprint, and thermal characteristics. Differences are limited to output voltage options (3V/5V vs. 3.3V/5V) and temperature grade (Commercial vs. Industrial). This allows direct substitution in existing layouts when voltage or temp requirements change.
LTC1515CS8-3/5#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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1515CS8-3/5#TRPBF FAQ
1.How can I place an order for LTC1515CS8-3/5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1515CS8-3/5#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 LTC1515CS8-3/5#TRPBF reliable?
The price and inventory of LTC1515CS8-3/5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1515CS8-3/5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1515CS8-3/5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1515CS8-3/5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1515CS8-3/5#TRPBF?
LTC1515CS8-3/5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1515CS8-3/5#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 LTC1515CS8-3/5#TRPBF?
For technical support, including LTC1515CS8-3/5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1515CS8-3/5#TRPBF requirements.
6.How does Aetrix verify that LTC1515CS8-3/5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1515CS8-3/5#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 LTC1515CS8-3/5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1515CS8-3/5#TRPBF?
All LTC1515CS8-3/5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1515CS8-3/5#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 LTC1515CS8-3/5#TRPBF part is unused and in its original packaging.
Return procedure for LTC1515CS8-3/5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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