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Analog Devices Inc. LTC1515IS8-3/5#PBF
- Part No.:
- LTC1515IS8-3/5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1515IS8-3/5#PBF.pdf
- Description:
- IC REG CHARGE PUMP PROG 50MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,199
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Product details
Overview
LTC1515IS8-3/5#PBF 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 (POR) with 200ms typical delay - used in GSM SIM interface power rails where dual-voltage rail sequencing and low quiescent current are critical.
For engineers reviewing the LTC1515IS8-3/5#PBF datasheet, LTC1515IS8-3/5#PBF pinout, LTC1515IS8-3/5#PBF application, or LTC1515IS8-3/5#PBF equivalent, key selection criteria include input voltage range compatibility (2V–10V), programmable 3V/5V output selection via 5/3 pin, SO-8 package thermal performance (θJA = 110°C/W), shutdown current <1µA, and POR timing behavior under varying VOUT ramp conditions.
Technical Context
The LTC1515IS8-3/5#PBF implements a step-up/step-down charge pump architecture with automatic mode switching: it operates as a voltage doubler when VIN < VOUT, and as a gated switch when VIN > VOUT. Internal voltage sensing dynamically adjusts effective output resistance to limit inrush current across wide VIN–VOUT differentials.
Regulation relies on a 1.232V internal reference compared against feedback (via external divider for LTC1515, or internal resistor network for -3/5 variant), with comparator hysteresis inducing controlled burst-mode operation at 650kHz typical switching frequency - producing ~100mVP-P ripple essential for regulation stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Selectable 3V or 5V via 5/3 pin logic level; ±4% regulation over full load and temperature range. |
| Input Voltage Range | 2V to 10V - enables direct use with single Li-ion (2.7–4.2V), 3-cell NiCd (3.6V), or 4-cell alkaline (6V) sources without pre-regulation. |
| Max Output Current | 50mA at VOUT = 5V with VIN ≥ 3.3V - sufficient for SIM card VCC and smart card reader core logic. |
| Quiescent Current | 60µA typical at VIN ≤ 5V - extends battery life in portable devices during active operation. |
| Shutdown Current | <1µA at VIN ≤ 5V - ensures negligible drain during system sleep states. |
| Switching Frequency | 650kHz typical - allows use of small 0.22µF flying capacitor and minimizes EMI in RF-sensitive cellular modules. |
| POR Delay | 200ms typical after VOUT reaches regulation - provides reliable reset assertion for baseband processors requiring stable supply before boot. |
Pinout & Package
Package: 8-lead plastic SO (SO-8, narrow 0.150"), JEDEC MS-012AC, θJA = 110°C/W, TJMAX = 125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SHDN | Active-low shutdown control | Logic low disables regulator and disconnects load from VIN; compatible with 3V logic across full VIN range; must not float. |
| 2 - POR | Open-drain power-on reset output | Pulls low until VOUT remains within ±6.5% of target for ≥200ms; requires external pull-up to VOUT for proper reset signaling. |
| 3 - 5/3 | Output voltage select | High = 5V output; low = 3V output; defines rail configuration for dual-voltage SIM interfaces; must be driven, not left floating. |
| 4 - GND | Analog/digital ground reference | Common return for all internal circuitry; must connect to low-impedance ground plane to minimize noise coupling into regulation loop. |
| 5 - C1– | Flying capacitor negative terminal | Completes charge pump capacitor path; requires low-ESR ceramic (0.22µF typical); layout symmetry critical for efficiency. |
| 6 - C1+ | Flying capacitor positive terminal | Completes charge pump capacitor path; pairs with C1– to transfer energy; sensitive to parasitic inductance - place close to IC. |
| 7 - VIN | Main input supply | Accepts 2V–10V unregulated input; requires ≥10µF low-ESR bypass capacitor placed adjacent to pin to suppress ripple-induced instability. |
| 8 - VOUT | Regulated output | Delivers selected 3V or 5V; requires ≥10µF low-ESR output capacitor; higher values (22µF+) reduce ripple at high VIN or heavy loads. |
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 need for separate boost/buck converters in multi-rail designs. |
| Programmable output selection | Single 5/3 pin selects 3V or 5V output without external resistors - simplifies BOM and PCB layout for SIM card readers supporting both 3V and 5V cards. |
| Integrated power-on reset | Open-drain POR with 200ms typ delay after regulation - replaces discrete reset IC and RC network, reducing component count in space-constrained handsets. |
| Soft-start control | 4ms typical VOUT ramp time from 0V to 5V - limits inrush to ~12.5mA with 10µF COUT, preventing brownout of shared input supplies. |
| Thermal & short-circuit protection | Shuts down at ~150°C junction temp; limits short-circuit current to 12mA typ - enables robust operation in thermally constrained handheld enclosures. |
Applications
| GSM SIM Card Interface | Smart Card Reader Power |
|---|---|
|
Use Scenario: Providing dual-voltage (3V/5V) regulated supply to SIM card slot in cellular handsets, where baseband processor controls voltage selection via GPIO. IC Role / Device Role / Timing Role: Primary local DC/DC converter delivering stable VCC to SIM; POR output synchronizes with baseband reset sequence. Use Value: Eliminates need for two separate LDOs or discrete reset circuitry; 60µA quiescent current extends standby battery life by >20% vs legacy solutions. |
Use Scenario: Generating programmable 3V/5V rail for contact-based smart card readers in point-of-sale terminals and access control systems. IC Role / Device Role / Timing Role: Standalone voltage source with logic-selectable output; POR ensures microcontroller initializes only after stable VCC. Use Value: Reduces bill-of-materials by consolidating voltage selection and reset generation into one SO-8 device; SO-8 footprint eases compliance with IPC-7351 spacing rules. |
| Portable Medical Sensor Node | Low-Power IoT Edge Device |
|
Use Scenario: Powering analog front-end and BLE SoC in battery-operated wearable sensors requiring clean 3V rail and precise power sequencing. IC Role / Device Role / Timing Role: Local regulator with POR-driven system enable; soft-start prevents transient loading of coin-cell battery during wake-up. Use Value: <1µA shutdown current enables multi-year shelf life; 2V minimum input supports aging battery operation down to 2.1V. |
Use Scenario: Supplying 5V to external peripherals (e.g., environmental sensors, UART transceivers) from a 3.3V system rail in compact edge nodes. IC Role / Device Role / Timing Role: Step-up converter enabling 5V peripheral support without dedicated boost IC; POR coordinates firmware initialization. Use Value: 650kHz switching allows use of 0.22µF flying cap - saves >3mm² PCB area vs lower-frequency alternatives using 1µF caps. |
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#PBF | Same electrical specs but rated for 0°C to 70°C commercial temperature range; lower θJA not specified - thermal margin reduced in enclosed industrial environments. | Suitable for consumer-grade portable electronics; not qualified for extended-temperature industrial deployments. | Select LTC1515IS8-3/5#PBF for applications requiring –40°C to 85°C operation, such as automotive telematics or outdoor IoT gateways. |
| LTC1515IS8-3.3/5#PBF | Identical package and pinout; replaces 3V option with 3.3V output; FB pin omitted - no adjustable mode support. | Used where 3.3V logic compatibility is required instead of legacy 3V SIM cards; incompatible with systems needing true 3V output. | Choose LTC1515IS8-3.3/5#PBF only if system design mandates 3.3V/5V dual-rail support and excludes 3V-only cards. |
Compared with LTC1515CS8-3/5#PBF, the LTC1515IS8-3/5#PBF offers guaranteed operation down to –40°C and higher thermal reliability in sealed enclosures; versus LTC1515IS8-3.3/5#PBF, it preserves backward compatibility with 3V SIM standards while maintaining identical board layout and control logic.
Availability
LTC1515IS8-3/5#PBF is available at Aetrix Electronics and suitable for GSM SIM interfaces, smart card readers, and portable medical sensor nodes requiring stable component supply with guaranteed long-term availability and industrial temperature support.
Supply support for LTC1515IS8-3/5#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 product support, datasheet archives, and application engineering resources for legacy Linear parts including the LTC1515 series.
The LTC1515 series was designed specifically for low-power, dual-voltage local power generation in space-constrained portable communications equipment - emphasizing micropower operation, integrated reset, and seamless 3V/5V SIM card compatibility.
FAQ
What is the operating temperature range for the LTC1515IS8-3/5#PBF?
The LTC1515IS8-3/5#PBF is specified for an industrial temperature range of –40°C to +85°C. This rating is confirmed in the Absolute Maximum Ratings table and applies across all electrical parameters unless otherwise noted. Junction temperature must not exceed 125°C, and thermal design should account for θJA = 110°C/W in standard SO-8 layout.
How does the 5/3 pin configure output voltage on the LTC1515IS8-3/5#PBF?
On the LTC1515IS8-3/5#PBF, the 5/3 pin is a logic-controlled input: a high signal (≥1.6V) selects 5V output, and a low signal (≤0.4V) selects 3V output. The pin must be actively driven - floating is prohibited. This configuration replaces external resistor networks and enables dynamic voltage switching in real time during system operation.
What external components are required for basic operation of the LTC1515IS8-3/5#PBF?
The LTC1515IS8-3/5#PBF requires exactly 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. No inductors or diodes are needed - the charge pump is fully integrated.
Does the LTC1515IS8-3/5#PBF provide short-circuit protection, and how does it behave under fault conditions?
Yes, the LTC1515IS8-3/5#PBF includes short-circuit protection that limits output current to 12mA typical when VOUT drops below 100mV. During sustained short, the device remains operational without damage and recovers automatically once the fault is removed. It also features overtemperature shutdown at ~150°C with hysteresis for safe thermal recovery.
Can the LTC1515IS8-3/5#PBF operate from a 2V input, and what is the minimum input for 5V output?
The LTC1515IS8-3/5#PBF supports 2V minimum input, but for 5V output the datasheet specifies a minimum input of 2.7V (with IOUT ≤ 15mA) or 3.3V (with IOUT ≤ 50mA). Below these thresholds, regulation cannot be maintained due to charge pump voltage conversion limits - attempting 5V output from 2V input will result in dropout.
LTC1515IS8-3/5#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:
- 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#PBF FAQ
1.How can I place an order for LTC1515IS8-3/5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1515IS8-3/5#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 LTC1515IS8-3/5#PBF reliable?
The price and inventory of LTC1515IS8-3/5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1515IS8-3/5#PBF is usually 5 days.
3.What payment methods are accepted for LTC1515IS8-3/5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1515IS8-3/5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1515IS8-3/5#PBF?
LTC1515IS8-3/5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1515IS8-3/5#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 LTC1515IS8-3/5#PBF?
For technical support, including LTC1515IS8-3/5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1515IS8-3/5#PBF requirements.
6.How does Aetrix verify that LTC1515IS8-3/5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1515IS8-3/5#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 LTC1515IS8-3/5#PBF meets industry standards.
7.What is the process for return or replacement of LTC1515IS8-3/5#PBF?
All LTC1515IS8-3/5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1515IS8-3/5#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 LTC1515IS8-3/5#PBF part is unused and in its original packaging.
Return procedure for LTC1515IS8-3/5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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