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Analog Devices Inc. LTC1515IS8#TRPBF
- Part No.:
- LTC1515IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1515IS8#TRPBF.pdf
- Description:
- IC REG CHARGE PUMP ADJ 50MA 8SO
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC1515IS8#TRPBF 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, 650kHz switching frequency, and integrated open-drain power-on reset (POR). It delivers up to 50mA output current and targets SIM interface and smart card power in portable equipment.
For engineers reviewing the LTC1515IS8#TRPBF datasheet, LTC1515IS8#TRPBF pinout, LTC1515IS8#TRPBF application, or LTC1515IS8#TRPBF equivalent, key selection criteria include input voltage range compatibility (2V–10V), dual-output voltage selection logic (3.3V/5V via 5/3 pin), shutdown current (<1µA), soft-start timing (4ms), and SO-8 thermal performance (θJA = 110°C/W).
Technical Context
The LTC1515IS8#TRPBF implements a daisy-chainable charge pump architecture that auto-selects step-up (doubling when VIN < VOUT) or step-down (gated switch when VIN > VOUT) mode based on real-time VIN–VOUT differential sensing. Internal hysteresis enables burst-mode regulation with ~100mVP-P ripple at full load.
Its POR circuit asserts low for ≥200ms after VOUT reaches within 6.5% of regulation, and features short-circuit protection (12–40mA limit) and thermal shutdown (~150°C trip). The 5/3 pin selects 3.3V or 5V output using internal resistor networks-no external feedback required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2V to 10V - supports single-cell Li-ion (2.7–4.4V), 3-cell NiCd (3.6V), or 4-cell NiCd (4.8V) without external regulators. |
| Output Voltage Options | Programmable 3.3V or 5V - selected by logic level on 5/3 pin; no external resistors needed. |
| Max Output Current | 50mA - sufficient for GSM SIM card interfaces and low-power microcontroller peripherals. |
| Switching Frequency | 650kHz (typ) - enables use of small 0.22µF flying capacitor and reduces EMI compared to lower-frequency charge pumps. |
| Quiescent Current | 60µA (typ) - extends battery life in always-on portable devices with infrequent wake cycles. |
| Shutdown Current | <1µA at VIN ≤ 5V - ensures negligible drain during system sleep states. |
| POR Delay | 200ms (typ) after VOUT regulation - provides reliable reset timing for microcontrollers and secure elements. |
| Regulation Accuracy | ±4% over temperature - meets tight tolerance requirements for SIM card voltage compliance (ETSI TS 102 221). |
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; must not float. |
| 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 | High = 5V output; low = 3.3V output; referenced to GND; must be driven, not left floating. |
| 4: GND | Ground reference | Primary return path for charge pump, POR, and logic; requires low-impedance connection to PCB 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 energy transfer. |
| 7: VIN | Input supply voltage | Accepts 2V–10V; bypass with ≥10µF low-ESR capacitor near pin to suppress input ripple and inrush transients. |
| 8: VOUT | Regulated output | Delivers stable 3.3V or 5V; bypass with ≥10µF low-ESR capacitor; supports up to 50mA continuous load. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-configuring step-up/step-down operation | Eliminates need for separate boost/buck ICs in multi-rail portable systems; adapts seamlessly across wide input range. |
| Daisy-chainable POR outputs | Enables synchronized reset sequencing across multiple LTC1515IS8#TRPBF units in multi-SIM or multi-card reader designs. |
| Integrated soft-start (4ms) | Limits inrush current to ~12.5mA into 10µF COUT, preventing brownout of weak input sources like coin cells. |
| Thermal and short-circuit protection | Survives indefinite GND short and self-recovers from junction temperatures up to 150°C without latch-off. |
| Only three external capacitors required | Reduces BOM count and board area vs. inductor-based converters; uses standard 0.22µF (C1), 10µF (CIN), 10µF (COUT). |
| Logic-compatible 5/3 and SHDN inputs | Operates with 3V logic across full 2V–10V VIN range-no level shifters needed for MCU GPIO interfacing. |
Applications
| GSM SIM Card Interface | Smart Card Reader Power |
|---|---|
Use Scenario: Providing compliant 3.3V or 5V supply to SIM cards in mobile handsets per ETSI TS 102 221. IC Role / Device Role / Timing Role: Primary regulated power source with POR signaling to baseband processor upon stable rail establishment. Use Value: Meets strict SIM voltage tolerance (±5%) and startup timing (≤200ms POR delay), eliminating need for discrete LDO + reset IC. | Use Scenario: Powering contact-based smart cards (e.g., EMV payment terminals, ID readers) requiring selectable 3.3V/5V rails. IC Role / Device Role / Timing Role: Dual-voltage generator with controlled enable/disable and reset assertion for secure element initialization. Use Value: Enables single-board support for legacy (5V) and modern (3.3V) smart cards without hardware reconfiguration. |
| Portable Medical Sensor Node | Industrial Handheld Scanner |
Use Scenario: Supplying 3.3V to ultra-low-power sensor signal chain (ADC, op-amps) powered by 2-cell alkaline batteries (2.4–3.2V). IC Role / Device Role / Timing Role: Step-up converter maintaining regulation as battery discharges below 3.3V; POR triggers MCU wake-up only after stable rail. Use Value: Extends usable battery life by operating down to 2V input while delivering clean 3.3V with <1µA shutdown current. | Use Scenario: Generating 5V for laser diode driver and 3.3V for ARM Cortex-M host in barcode scanners powered by 3.7V Li-ion. IC Role / Device Role / Timing Role: Dual-rail power manager with independent enable control and coordinated POR for system-level boot reliability. Use Value: Reduces component count vs. two separate converters; daisy-chained POR ensures deterministic boot sequence across subsystems. |
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; rated for 0°C to 70°C commercial temp range vs. –40°C to 85°C industrial grade. | Suitable for consumer electronics but not extended-temperature industrial or automotive environments. | Select LTC1515IS8#TRPBF for designs requiring guaranteed operation at –40°C or 85°C ambient. |
| LTC1516ES5#TRMPBF | SOT-23-5 package; fixed 5V output only; 20mA max output (50mA at VIN ≥ 3V); 6µA quiescent current. | Lacks 3.3V option, POR, and daisy-chain capability; limited to space-constrained 5V-only applications. | Choose LTC1515IS8#TRPBF when dual-voltage selection, reset signaling, or >20mA load is required. |
Compared with LTC1515CS8-3.3/5, the LTC1515IS8#TRPBF offers extended temperature reliability; compared with LTC1516ES5#TRMPBF, it adds voltage flexibility, reset functionality, and 2.5× higher output current-making it the sole fit for industrial SIM card and dual-rail portable power.
Availability
LTC1515IS8#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 support, and industrial-grade temperature performance.
Supply support for LTC1515IS8#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 precision analog and power management portfolio with full backward compatibility and long-term support.
The LTC1515 series was designed specifically for low-power, dual-voltage SIM and smart card applications where small size, minimal external components, and integrated POR are critical-targeting portable and battery-operated systems.
FAQ
What is the maximum output current capability of the LTC1515IS8#TRPBF?
The LTC1515IS8#TRPBF delivers up to 50mA continuous output current when configured for 5V output with VIN ≥ 3.3V. At 3.3V output and VIN ≥ 3V, it sustains 50mA; derating applies below 3V input. Short-circuit current is internally limited to 12–40mA, protecting the device during fault conditions without external current-sense circuitry.
How does the 5/3 pin select between 3.3V and 5V output on the LTC1515IS8#TRPBF?
On the LTC1515IS8#TRPBF, the 5/3 pin is a logic-controlled input: a high signal (≥1.6V) forces VOUT to regulate at 5V, while a low signal (≤1.0V) selects 3.3V. This pin must be actively driven-floating is prohibited-and operates reliably across the full 2V–10V input range without level shifting.
Does the LTC1515IS8#TRPBF require an external feedback resistor network?
No, the LTC1515IS8#TRPBF does not require external feedback resistors. Unlike the adjustable LTC1515 variant, this part integrates internal resistor networks for 3.3V/5V selection via the 5/3 pin. External resistors are only needed for the base LTC1515 (not the -3.3/5 suffix), making the LTC1515IS8#TRPBF simpler to implement in dual-voltage applications.
What is the purpose and timing behavior of the POR pin on the LTC1515IS8#TRPBF?
The POR (Power-On Reset) pin on the LTC1515IS8#TRPBF is an open-drain output that remains low until VOUT reaches and sustains regulation within 6.5% for 200ms (typical). It asserts low again during shutdown or power loss. An external pull-up resistor to VOUT is required to generate a clean active-high reset signal for microcontrollers or FPGAs.
Can the LTC1515IS8#TRPBF operate from a single 2.7V Li-ion cell?
Yes, the LTC1515IS8#TRPBF operates from a single 2.7V Li-ion cell across its full discharge range (down to 2.0V). In step-up mode, it generates stable 3.3V or 5V output with ±4% regulation. Efficiency exceeds 80% at 10mA load with 2.7V input, and quiescent current remains at 60µA-enabling multi-year battery life in low-duty-cycle portable devices.
LTC1515IS8#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:
- 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#TRPBF FAQ
1.How can I place an order for LTC1515IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1515IS8#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#TRPBF reliable?
The price and inventory of LTC1515IS8#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1515IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1515IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1515IS8#TRPBF?
LTC1515IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1515IS8#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#TRPBF?
For technical support, including LTC1515IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1515IS8#TRPBF requirements.
6.How does Aetrix verify that LTC1515IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1515IS8#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1515IS8#TRPBF?
All LTC1515IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1515IS8#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC1515IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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