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Analog Devices Inc. LTC1522CS8#PBF
- Part No.:
- LTC1522CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1522CS8#PBF.pdf
- Description:
- IC REG CHARGE PUMP 5V 20MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:137
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Product details
Overview
LTC1522CS8#PBF from Analog Devices (formerly Linear Technology) is a micropower regulated 5V charge pump DC/DC converter designed for low-current battery-powered systems. It delivers up to 20mA output from a 2.7V–5V input, features 6µA typical operating supply current, ±4% output regulation, and internal 700kHz oscillator - enabling compact, inductorless power conversion in space-constrained portable electronics.
For engineers reviewing the LTC1522CS8#PBF datasheet, LTC1522CS8#PBF pinout, LTC1522CS8#PBF application, or LTC1522CS8#PBF equivalent, key selection criteria include ultralow quiescent current (<1µA shutdown), thermal/short-circuit protection, no-inductor design, and compatibility with Li-ion, SIM interface, and smart card power rails where regulated 5V at light loads is required.
Technical Context
The LTC1522CS8#PBF uses a two-phase nonoverlapping switched-capacitor topology to boost input voltage to a regulated 5V output via internal comparator-controlled hysteresis (COMP1) and flying capacitor (CFLY) charge/discharge cycles. Regulation is maintained by enabling the charge pump only when VOUT drops below the lower trip point.
It integrates CMOS-level active-high SHDN control with VIN-referenced threshold (~VIN/2), disconnects VOUT from VIN during shutdown, and includes on-chip thermal shutdown (trip ≈160°C, hysteresis ≈15°C) for indefinite short-circuit survival. The device operates without inductors and supports ultralow-IQ operation via modulated shutdown (e.g., 2Hz–100Hz, 95–98% duty cycle).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0V ±4% (4.8–5.2V), tightly regulated across 2.7–5V input and 0–20mA load |
| Input Voltage Range | 2.7V to 5V - supports single-cell Li-ion (3.0–4.2V), NiMH, and 3.3V system rails |
| Operating Supply Current | 6µA typical (no load) - enables multi-year battery life in always-on sensor or backup circuits |
| Shutdown Current | <1µA (VIN ≤ 3.6V) - ensures minimal drain during standby or sleep modes |
| Switching Frequency | 700kHz free-running - allows use of small 0.22µF ceramic flying capacitor and compact layout |
| Output Current Capability | 10mA (VIN ≥ 2.7V), 20mA (VIN ≥ 3V) - sufficient for SIM interfaces, smart card readers, and PCMCIA logic |
| Output Ripple | 70mVP-P max (VIN = 3V, IOUT = 10mA) - manageable with 10µF low-ESR output capacitor |
| Efficiency | 82% typical (VIN = 3V, IOUT = 10mA) - high efficiency maintained down to 10µA via SHDN modulation |
Pinout & Package
Package: 8-pin SO (Small Outline, narrow 0.150"), RoHS-compliant, surface-mount. Pin pitch: 1.27mm. Body dimensions: 4.88mm × 3.90mm × 1.75mm (L×W×H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (NC) | No Connect | Unbonded; must be left floating or tied to GND - no electrical function |
| Pin 2 (VIN) | Input Supply | 2.7–5V main power input; requires ≥3.3µF low-ESR bypass capacitor near pin |
| Pin 3 (VOUT) | Regulated Output | 5V ±4% output; disconnected from VIN during shutdown; bypass with ≥3.3µF low-ESR cap |
| Pin 4 (C+) | Flying Cap Positive | Connects to positive terminal of 0.22µF flying capacitor (CFLY); critical for charge transfer |
| Pin 5 (C−) | Flying Cap Negative | Connects to negative terminal of CFLY; forms charge pump switching node with C+ |
| Pin 6 (GND) | Analog/Digital Ground | Common reference for all circuitry; requires low-impedance connection to PCB ground plane |
| Pin 7 (SHDN) | Active-High Shutdown | CMOS input; drive low to enable, high to disable; threshold ≈VIN/2; must not float |
| Pin 8 (NC) | No Connect | Unbonded; must be left floating or tied to GND - no electrical function |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow operating current | 6µA typical ICC enables >10-year battery life in 10µA-load applications like real-time clocks |
| Inductorless architecture | Eliminates magnetic components - reduces BOM cost, EMI risk, and board area vs. inductive DC/DC |
| Thermal and short-circuit protection | Survives continuous VOUT-to-GND short with automatic thermal cycling (no latch-up or damage) |
| Shutdown load isolation | VOUT fully disconnected from VIN in shutdown - prevents backfeed and leakage into powered-down rails |
| Compact external component count | Only three capacitors required: 0.22µF flying + two 10µF input/output - total solution area <0.1 in² |
| Wide input voltage range | 2.7V–5V operation accommodates aging Li-ion cells (down to 2.7V) and dual-supply systems |
Applications
| Smart Card Readers | SIM Interface Supplies |
|---|---|
|
Use Scenario: Powering ISO 7816-compliant contact smart cards in POS terminals, ID badges, and secure access devices. IC Role / Device Role / Timing Role: Regulated 5V supply generator with fast turn-on (1ms) and low-noise output for card VCC rail. Use Value: Meets ISO 7816-3 VCC tolerance (4.75–5.25V) and supports hot-plug detection via controlled startup sequence. |
Use Scenario: Providing programmable 5V/3V SIM power in GSM cellular handsets per ETSI TS 102 221. IC Role / Device Role / Timing Role: Primary 5V SIM supply; paired with level translators (e.g., LTC1555) for 3V/5V SIM mode switching. Use Value: Enables dual-voltage SIM support using single external components and meets GSM RF noise requirements via 700kHz fixed frequency. |
| Li-Ion Battery Backup Supplies | PCMCIA Local 5V Supplies |
|
Use Scenario: Maintaining 5V bias for RTC, SRAM, or security ICs during main power loss in portable medical or industrial loggers. IC Role / Device Role / Timing Role: Low-quiescent backup regulator that activates automatically when main supply drops below 2.7V. Use Value: Delivers stable 5V from depleted Li-ion (≥2.7V) with <1µA shutdown draw - extends backup runtime by >3× vs. LDO solutions. |
Use Scenario: Generating local 5V for PCMCIA/CardBus peripheral slots in laptops and embedded controllers. IC Role / Device Role / Timing Role: Compact, low-heat 5V source meeting PCMCIA 2.01 specification for slot power delivery. Use Value: Replaces bulky inductive converters; fits within tight card-edge height constraints while delivering 20mA peak current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar regulated charge pump DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1516CS8#PBF | Same 8-pin SO package, identical pinout, but supports wider 2V–5V input and higher 50mA output (VIN ≥ 3V) | Better suited for higher-load applications (e.g., USB peripherals), but draws 10µA typical ICC - 67% higher than LTC1522CS8#PBF | Select LTC1516CS8#PBF only if >20mA output or sub-2.7V start-up is required; otherwise LTC1522CS8#PBF offers superior IQ |
| LTC1517-5CS5#TRMPBF | SOT-23-5 package, no SHDN pin, fixed 5V output, 10µA ICC, 15mA output - lacks shutdown control and thermal protection | Targeted at ultra-small footprint applications where shutdown and fault protection are unnecessary (e.g., disposable sensors) | Choose LTC1517-5CS5#TRMPBF only for size-constrained designs accepting trade-offs in protection and control flexibility |
Compared with LTC1516CS8#PBF and LTC1517-5CS5#TRMPBF, the LTC1522CS8#PBF uniquely balances ultralow 6µA operating current, integrated thermal/short-circuit protection, and full shutdown control - making it optimal for long-life, safety-critical, and battery-sensitive 5V charge pump applications where 20mA output suffices.
Availability
LTC1522CS8#PBF is available at Aetrix Electronics and suitable for smart card readers, SIM interface supplies, and Li-ion battery backup systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1522CS8#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, power management, and signal conditioning product lines with full datasheet, reliability, and support continuity.
The LTC1522CS8#PBF belongs to Linear's micropower charge pump DC/DC converter family, engineered specifically for ultra-low-power, inductorless 5V generation in portable communications and secure identification systems.
FAQ
What is the minimum input voltage required for the LTC1522CS8#PBF to deliver 10mA output current?
The LTC1522CS8#PBF requires a minimum input voltage of 2.7V to deliver up to 10mA output current while maintaining 5V ±4% regulation. Below 2.7V, regulation cannot be guaranteed per the Electrical Characteristics table, and output voltage will drop proportionally with input.
Does the LTC1522CS8#PBF require an external resistor divider to set output voltage?
No, the LTC1522CS8#PBF does not require an external resistor divider. It features an internal fixed-resistor feedback network that regulates VOUT to 5.0V ±4%. The output voltage is factory-trimmed and non-adjustable - simplifying design and reducing component count.
Can the LTC1522CS8#PBF survive a continuous short circuit from VOUT to GND?
Yes, the LTC1522CS8#PBF can survive a continuous short from VOUT to GND. Its on-chip thermal shutdown circuit disables the charge pump when junction temperature exceeds ≈160°C and re-enables it once temperature falls to ≈145°C, allowing safe, indefinite cycling without damage.
What is the recommended flying capacitor value for the LTC1522CS8#PBF, and why?
The recommended flying capacitor value for the LTC1522CS8#PBF is 0.22µF ceramic. This value balances output ripple, efficiency, and maximum output current. Larger values increase ripple and reduce efficiency; smaller values (e.g., 0.01–0.047µF) lower ripple but sacrifice output current capability and efficiency.
How does the LTC1522CS8#PBF achieve ultralow quiescent current in no-load conditions?
The LTC1522CS8#PBF achieves ultralow quiescent current (<2.1µA typical at VIN = 3V) by combining inherent 6µA operating current with modulated shutdown: applying a low-duty-cycle (95–98%), low-frequency (2–100Hz) signal to SHDN keeps the device mostly off while delivering just enough charge pulses to maintain regulation - drastically reducing average ICC.
LTC1522CS8#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
- Output Configuration:
- Positive
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 20mA
- Frequency - Switching:
- 700kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1522CS8#PBF FAQ
1.How can I place an order for LTC1522CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1522CS8#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 LTC1522CS8#PBF reliable?
The price and inventory of LTC1522CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1522CS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1522CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1522CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1522CS8#PBF?
LTC1522CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1522CS8#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 LTC1522CS8#PBF?
For technical support, including LTC1522CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1522CS8#PBF requirements.
6.How does Aetrix verify that LTC1522CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1522CS8#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 LTC1522CS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1522CS8#PBF?
All LTC1522CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1522CS8#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 LTC1522CS8#PBF part is unused and in its original packaging.
Return procedure for LTC1522CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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