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Analog Devices Inc. LTC1515CS8-3.3/5#PBF
- Part No.:
- LTC1515CS8-3.3/5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1515CS8-3.3/5#PBF.pdf
- Description:
- IC REG CHARGE PUMP PROG 50MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,658
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Product details
Overview
LTC1515CS8-3.3/5#PBF from Analog Devices (formerly Linear Technology) is a micropower switched capacitor DC/DC converter that provides selectable 3.3V or 5V regulated output via logic-controlled step-up/step-down operation. It operates from 2V to 10V input, delivers up to 50mA, features open-drain POR with 200ms delay, and is housed in an SO-8 package. It is used in SIM interface power supplies for GSM handsets.
For engineers reviewing the LTC1515CS8-3.3/5#PBF datasheet, LTC1515CS8-3.3/5#PBF pinout, LTC1515CS8-3.3/5#PBF application, or LTC1515CS8-3.3/5#PBF equivalent, key selection criteria include input voltage range compatibility (2V–10V), dual-output voltage selectability (3.3V/5V), 650kHz switching frequency, <1µA shutdown current, and integrated power-on reset functionality.
Technical Context
The LTC1515CS8-3.3/5#PBF implements a unique charge pump architecture that automatically switches between step-up (voltage doubler) and step-down (gated switch) modes based on VIN–VOUT differential sensing. Internal output impedance adjustment prevents inrush current spikes during high VIN-to-VOUT transitions.
Regulation is achieved via hysteresis-based comparator control of the 650kHz oscillator, producing ~100mVP-P ripple required for burst-mode operation. The 5/3 pin selects output voltage (3.3V or 5V) by switching internal resistor networks, while POR asserts low until VOUT stabilizes within ±6.5% for ≥200ms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Options | Selectable 3.3V or 5V via logic level on 5/3 pin - enables single-part support for dual-rail SIM or smart card interfaces. |
| Input Voltage Range | 2V to 10V - supports single-cell Li-ion (2.7–4.2V), multi-cell NiCd/NiMH (3–9V), and wide-input industrial rails without external regulators. |
| Max Output Current | 50mA at 3.3V or 5V - sufficient for GSM SIM card power (ISO/IEC 7816-3 compliant loads) and local microcontroller peripherals. |
| Switching Frequency | 650kHz typical - allows use of small 0.22µF flying capacitor and minimizes EMI in portable RF-sensitive designs. |
| Shutdown Current | <1µA at VIN ≤ 5V - extends battery life in always-on standby applications such as smart card readers and secure modules. |
| POR Delay | 200ms typical after VOUT regulation - ensures reliable system reset timing for baseband processors and modem ICs. |
| Operating Current | 60µA typical at VIN ≤ 5V - enables ultra-low-quiescent operation in energy-constrained IoT sensor nodes. |
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 | Shutdown Control Input | Logic-high (≥1.6V) enables regulator; logic-low disables output and reduces ICC to <1µA - compatible with 3V GPIO without level shifting. |
| 2 - POR | Open-Drain Power-On Reset Output | Pulls low during power-up, shutdown, or VOUT undervoltage; releases after 200ms once VOUT reaches ±6.5% - requires external pull-up to VOUT for reset assertion. |
| 3 - 5/3 | Output Voltage Select Input | High = 5V output; low = 3.3V output - must be driven (not floated); compatible with full VIN range logic levels. |
| 4 - GND | Ground Reference | Primary return path for charge pump, feedback, and POR circuits - 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 in both step-up and step-down modes. |
| 6 - C1+ | Flying Capacitor Positive Terminal | Connects to positive side of 0.22µF ceramic flying capacitor - forms bidirectional charge transfer path with C1–. |
| 7 - VIN | Input Supply Voltage | Accepts 2V–10V unregulated input - requires ≥10µF low-ESR bypass capacitor placed adjacent to pin to suppress ripple and inrush transients. |
| 8 - VOUT | Regulated Output Voltage | Delivers stable 3.3V or 5V output - requires ≥10µF low-ESR output capacitor; 22µF recommended for VIN ≥ 8V to maintain ≤100mVP-P ripple. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode charge pump | Automatically selects step-up (doubler) or step-down (gated switch) based on VIN–VOUT differential - eliminates need for separate buck/boost ICs in multi-rail portable systems. |
| Programmable output selection | 3.3V/5V selection via single logic pin (5/3) - simplifies firmware control and enables dynamic rail switching in SIM card readers and dual-voltage peripherals. |
| Integrated power-on reset | Open-drain POR with 200ms delay and ±6.5% trip threshold - replaces discrete reset ICs and ensures deterministic processor initialization timing. |
| Soft-start and inrush limiting | 4ms typical VOUT ramp time and adaptive output impedance control - prevents input supply droop during startup and high-dV/dt transitions. |
| Robust protection suite | Short-circuit current limit (~12mA typ) and thermal shutdown (~150°C) - enables safe operation under fault conditions without external current-sense circuitry. |
Applications
| GSM SIM Interface Power | Smart Card Reader Supply |
|---|---|
Use Scenario: Providing regulated 3.3V or 5V power to SIM cards in mobile handsets operating from single-cell Li-ion batteries (2.7–4.2V). IC Role / Device Role / Timing Role: Step-up/step-down DC/DC converter with programmable output and POR - serves as primary SIM power rail generator and system reset source. Use Value: Enables single-part compliance with ISO/IEC 7816-3 voltage classes (Class A: 5V ±5%, Class C: 3.3V ±5%) while maintaining <1µA shutdown current for extended standby. | Use Scenario: Powering contact-based smart cards (e.g., EMV payment cards) in handheld POS terminals with variable input sources (USB, coin cell, or LiPo). IC Role / Device Role / Timing Role: Dual-voltage micropower regulator with logic-selectable output and POR - manages card insertion detection, voltage class negotiation, and secure boot sequencing. Use Value: Eliminates need for manual voltage jumpers or dual LDOs; POR output synchronizes MCU initialization with card power stabilization per ISO/IEC 7816-3 timing requirements. |
| Portable Medical Sensor Node | Industrial Local Bias Supply |
Use Scenario: Generating clean 3.3V bias for low-power ADCs, op-amps, and BLE radios in battery-operated wearable health monitors. IC Role / Device Role / Timing Role: Efficient switched-capacitor converter with ultra-low quiescent current - supplies analog front-end and wireless subsystem from coin cell or small Li-ion. Use Value: Achieves >80% efficiency at 10mA load across 2.5–4.5V input range while delivering <100mVP-P ripple - preserves signal integrity in precision measurement paths. | Use Scenario: Creating isolated 5V local supply for I²C peripherals or optocoupler drivers in 24V industrial control modules with space constraints. IC Role / Device Role / Timing Role: Compact, no-inductor DC/DC solution with wide input tolerance - replaces bulky isolated DC/DC modules in non-safety-critical auxiliary rails. Use Value: Reduces BOM count by eliminating magnetics and enables SO-8 footprint compatibility with existing layout - supports 2V–10V input transients common in factory floor power distribution. |
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 |
|---|---|---|---|
| LTC1515IS8-3.3/5 | Same electrical specs but rated for –40°C to +85°C industrial temperature range vs. 0°C to +70°C commercial grade. | Suitable for automotive cabin modules, outdoor IoT gateways, or industrial HMIs requiring extended thermal operation. | Select when ambient operating temperature exceeds 70°C or requires guaranteed performance over full industrial range. |
| LTC1514CS8-3.3/5 | Identical pinout and function but lacks POR output - no integrated power-on reset capability. | Applicable where external reset IC or MCU internal reset suffices; not suitable for systems requiring hardware-level POR synchronization. | Choose only if POR functionality is unnecessary and cost reduction is prioritized over design simplicity and reliability. |
Compared with LTC1515CS8-3.3/5#PBF, the LTC1515IS8-3.3/5 offers identical performance with extended temperature qualification, while the LTC1514CS8-3.3/5 removes POR to reduce cost - making the LTC1515CS8-3.3/5#PBF optimal for designs needing guaranteed reset timing and commercial-grade reliability.
Availability
LTC1515CS8-3.3/5#PBF is available at Aetrix Electronics and suitable for GSM SIM interface power, smart card reader supply, and portable medical sensor node applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC1515CS8-3.3/5#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC1515 series was designed specifically for ultra-low-power, no-inductor DC/DC conversion in space-constrained portable electronics - targeting SIM card, smart card, and local bias supply applications where efficiency, small size, and integrated reset are critical.
FAQ
What is the maximum output current capability of the LTC1515CS8-3.3/5#PBF at 3.3V output?
The LTC1515CS8-3.3/5#PBF delivers up to 50mA at 3.3V output when VIN is ≥3V and ≤8V. At lower input voltages (2V–3V), output current is reduced due to charge pump limitations; full 50mA is sustained across the specified 3V–8V input range per the Electrical Characteristics table.
Can the LTC1515CS8-3.3/5#PBF operate from a single 2.7V Li-ion cell and still produce 5V output?
Yes, the LTC1515CS8-3.3/5#PBF can generate 5V output from a 2.7V input using its step-up (voltage doubler) mode. Regulation is maintained with ±4% accuracy across 2.7V–10V input, and the device automatically switches to step-up operation when VIN falls below VOUT - confirmed in Typical Performance Characteristics (Figure TA01).
How does the POR pin on the LTC1515CS8-3.3/5#PBF behave during shutdown?
During shutdown (SHDN = low), the POR pin on the LTC1515CS8-3.3/5#PBF is actively pulled low, providing a valid reset signal to downstream logic. This behavior is explicitly stated in the PIN FUNCTIONS section: "In shutdown, the POR output is pulled low." It remains low until SHDN is asserted high and VOUT stabilizes within ±6.5% for ≥200ms.
What external components are required for basic operation of the LTC1515CS8-3.3/5#PBF?
The LTC1515CS8-3.3/5#PBF requires only three external capacitors: a 0.22µF ceramic flying capacitor (C1) between C1+ and C1–, a ≥10µF low-ESR input capacitor (CIN) at VIN, and a ≥10µF low-ESR output capacitor (COUT) at VOUT. No inductors, diodes, or resistive feedback network are needed for fixed 3.3V/5V operation.
Is the LTC1515CS8-3.3/5#PBF RoHS-compliant and lead-free?
Yes, the #PBF suffix in LTC1515CS8-3.3/5#PBF denotes lead-free (Pb-free) and RoHS-compliant packaging per Analog Devices' product marking convention. The SO-8 package uses matte tin lead finish and meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) requirements.
LTC1515CS8-3.3/5#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):
- 3.3V, 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
LTC1515CS8-3.3/5#PBF FAQ
1.How can I place an order for LTC1515CS8-3.3/5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1515CS8-3.3/5#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 LTC1515CS8-3.3/5#PBF reliable?
The price and inventory of LTC1515CS8-3.3/5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1515CS8-3.3/5#PBF is usually 5 days.
3.What payment methods are accepted for LTC1515CS8-3.3/5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1515CS8-3.3/5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1515CS8-3.3/5#PBF?
LTC1515CS8-3.3/5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1515CS8-3.3/5#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 LTC1515CS8-3.3/5#PBF?
For technical support, including LTC1515CS8-3.3/5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1515CS8-3.3/5#PBF requirements.
6.How does Aetrix verify that LTC1515CS8-3.3/5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1515CS8-3.3/5#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 LTC1515CS8-3.3/5#PBF meets industry standards.
7.What is the process for return or replacement of LTC1515CS8-3.3/5#PBF?
All LTC1515CS8-3.3/5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1515CS8-3.3/5#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 LTC1515CS8-3.3/5#PBF part is unused and in its original packaging.
Return procedure for LTC1515CS8-3.3/5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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