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Analog Devices Inc. LTC1522IS8#TRPBF
- Part No.:
- LTC1522IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1522IS8#TRPBF.pdf
- Description:
- IC REG CHARGE PUMP 5V 20MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,183
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Product details
Overview
LTC1522IS8#TRPBF 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 a stable 5V ±4% output from a 2.7V–5V input, draws only 6µA typical operating current, supports up to 20mA output at VIN ≥ 3V, and integrates a 700kHz internal oscillator - ideal for SIM interface supplies and smart card readers.
For engineers reviewing the LTC1522IS8#TRPBF datasheet, LTC1522IS8#TRPBF pinout, LTC1522IS8#TRPBF application, or LTC1522IS8#TRPBF equivalent, key selection criteria include ultralow quiescent current (<1µA in shutdown), no-inductor architecture, thermal/short-circuit protection, and compatibility with compact 8-pin SO packaging for space-constrained portable designs.
Technical Context
The LTC1522IS8#TRPBF uses a two-phase nonoverlapping switched-capacitor topology to regulate VOUT at 5V ±4% without inductors. Regulation is achieved via internal hysteresis sensing (COMP1 comparator) that enables/disables the charge pump based on output droop, maintaining efficiency >75% down to 10µA load when SHDN is modulated.
It features active-high CMOS SHDN control with VIN/2 threshold, full load disconnection during shutdown, and on-chip thermal shutdown (~160°C trip, ~145°C recovery). The device survives continuous VOUT-to-GND short circuits and operates across –40°C to 85°C (extended commercial grade).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0V ±4% - tightly regulated for logic-level compatibility in SIM/smart card interfaces |
| Input Voltage Range | 2.7V to 5V - supports single-cell Li-ion, NiMH, and 3.3V system rails |
| Operating Supply Current | 6µA typical (no load) - enables multi-year battery life in always-on low-power peripherals |
| Shutdown Current | <1µA (VIN ≤ 3.6V) - eliminates standby drain in sleep-mode systems |
| Output Current Capability | 20mA at VIN ≥ 3V - sufficient for GSM SIM card activation and PCMCIA local 5V supply |
| Switching Frequency | 700kHz free-running - enables use of small 0.22µF flying capacitor and minimizes EMI filtering burden |
| Efficiency | 82% at VIN = 3V, IOUT = 10mA - high conversion efficiency preserves battery energy under light-to-moderate loads |
Pinout & Package
Package: 8-lead plastic SO (Small Outline, narrow 0.150"), RoHS-compliant, tape-and-reel (TRPBF suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: NC | No Connect | Unbonded pad - must remain unconnected; no routing or grounding required |
| Pin 2: VIN | Input Supply | 2.7V–5V input rail; requires ≥3.3µF low-ESR bypass capacitor for stable operation |
| Pin 3: VOUT | Regulated Output | 5V ±4% output; disconnected from VIN during shutdown; bypass with ≥3.3µF low-ESR capacitor |
| Pin 4: C+ | Flying Capacitor Positive | Connects to positive terminal of 0.22µF ceramic flying capacitor (CFLY) |
| Pin 5: C− | Flying Capacitor Negative | Connects to negative terminal of CFLY; forms charge-transfer path with C+ |
| Pin 6: GND | Ground Reference | Analog/digital ground return; must be tied to low-impedance ground plane for ripple control |
| Pin 7: SHDN | Active-High Shutdown Control | CMOS input (VIH ≈ VIN/2); drive low to enable, high to disconnect load and reduce IQ to <1µA |
| Pin 8: NC | No Connect | Unbonded pad - leave floating or unconnected; no electrical function |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow operating current | 6µA typical ICC enables >10-year battery life in 10µA-load applications like smart card readers |
| Thermal + short-circuit protection | Auto-cycling thermal shutdown (160°C trip) and indefinite VOUT-to-GND short survival ensure field reliability |
| No-inductor architecture | Eliminates magnetic components and EMI concerns - reduces BOM count and PCB area by >30% vs inductive converters |
| Low-noise regulated output | 70mVP-P ripple (VIN=3V, IOUT=10mA) with standard 10µF ceramic output cap - meets SIM interface noise requirements |
| PIN-compatible upgrade path | Pin-for-pin compatible with LTC1516 in VIN ≥ 2.7V / IOUT ≤ 20mA applications - simplifies legacy design refresh |
Applications
| Smart Card Readers | GSM SIM Interface Supplies |
|---|---|
Use Scenario: Powering ISO 7816-compliant smart cards in point-of-sale terminals and secure authentication devices. IC Role / Device Role / Timing Role: Regulated 5V supply generator with fast turn-on (1ms) and low-noise output for card reset and communication. Use Value: Meets ISO 7816-3 voltage tolerance (5V ±4%) and supports hot-plug card insertion without brownout or latch-up. |
Use Scenario: Providing programmable 5V/3V SIM power in dual-voltage GSM cellular handsets. IC Role / Device Role / Timing Role: Primary 5V SIM supply; paired with external FETs and level shifters (e.g., LTC1522IS8#TRPBF + Si6943DQ) for voltage selection. Use Value: Enables dynamic SIM voltage switching per GSM TR 101 320 spec while maintaining <1µA shutdown current during idle. |
| Li-Ion Battery Backup Supplies | PCMCIA Local 5V Supplies |
Use Scenario: Generating stable 5V backup rail from partially discharged Li-ion cells (2.7V–4.2V) in real-time clocks and SRAM keep-alive circuits. IC Role / Device Role / Timing Role: Micropower boost converter with automatic load disconnection during deep sleep. Use Value: Extends backup runtime beyond cell's native voltage range while drawing only 6µA during normal operation. |
Use Scenario: Delivering local 5V power to PCMCIA Type II cards in embedded industrial controllers and data loggers. IC Role / Device Role / Timing Role: Compact, low-heat 5V source replacing bulkier inductive solutions in tight card-edge layouts. Use Value: Fits within 0.1 in² footprint with minimal thermal rise - avoids derating issues common with inductor-based modules. |
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; wider input range (2V–5V); higher output current (50mA at VIN ≥ 3V) | Supports heavier loads but consumes 12µA typical ICC - less suitable for ultra-low-power sleep modes | Choose when >20mA output or lower VIN (down to 2V) is required; not drop-in due to higher IQ and different shutdown behavior |
| LTC1517-5CS6#TRMPBF | SOT-23-6 package; no SHDN pin; fixed 5V output; 10mA max IOUT; 8µA ICC | Lacks shutdown control and thermal protection - limited to simple, non-critical 5V generation | Select only for cost-sensitive, space-constrained designs where shutdown and robustness are unnecessary |
Compared with LTC1516CS8#PBF and LTC1517-5CS6#TRMPBF, the LTC1522IS8#TRPBF uniquely balances ultralow IQ (<1µA shutdown), integrated protection, and SO-package compatibility - making it optimal for battery-backed, safety-aware portable applications where power budget and reliability are co-prioritized.
Availability
LTC1522IS8#TRPBF is available at Aetrix Electronics and suitable for GSM SIM interface supplies, smart card readers, and Li-ion battery backup circuits requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1522IS8#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. Linear was founded in 1981 and specialized in high-performance linear ICs, including innovative switching regulators and data converters.
The LTC1522IS8#TRPBF belongs to Linear's micropower charge pump DC/DC converter family, engineered specifically for ultra-low-power, inductorless voltage boosting in portable and battery-operated systems - emphasizing IQ minimization, small footprint, and robust fault handling.
FAQ
What is the maximum continuous output current supported by the LTC1522IS8#TRPBF?
The LTC1522IS8#TRPBF delivers up to 20mA continuous output current when VIN ≥ 3V and up to 10mA when VIN ≥ 2.7V. This rating assumes proper capacitor selection (0.22µF flying cap, 10µF input/output caps) and operation within the –40°C to 85°C temperature range. Exceeding these conditions may trigger thermal shutdown or cause regulation loss.
Does the LTC1522IS8#TRPBF require an external inductor?
No, the LTC1522IS8#TRPBF is a switched-capacitor (charge pump) DC/DC converter and does not require an inductor. It uses a 0.22µF ceramic flying capacitor and two 10µF bypass capacitors (at VIN and VOUT) to generate its regulated 5V output - eliminating magnetic components, reducing EMI, and minimizing PCB area.
How does shutdown mode affect the load connection in the LTC1522IS8#TRPBF?
In shutdown mode, the LTC1522IS8#TRPBF actively disconnects the load from VIN using internal switches. This ensures zero current flows from the input supply to the output, limiting total shutdown current to <1µA (VIN ≤ 3.6V). VOUT remains floating but retains charge on its output capacitor until leakage discharges it.
What is the purpose of the NC pins on the LTC1522IS8#TRPBF SO package?
Pins 1 and 8 of the LTC1522IS8#TRPBF are designated NC (No Connect) and are internally unconnected. They must remain unconnected - neither grounded nor routed - to avoid parasitic coupling or mechanical stress on the die bond wires. These pins serve only as structural supports in the SO package mold.
Can the LTC1522IS8#TRPBF operate with input voltages below 2.7V?
No, the LTC1522IS8#TRPBF has a specified minimum input voltage of 2.7V. Operation below this threshold is outside Absolute Maximum Ratings and may result in failure to start, unstable regulation, or undefined behavior. For sub-2.7V inputs, consider alternatives such as the LTC1516 (2V min) or LTC1514/15 series.
LTC1522IS8#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
- 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
LTC1522IS8#TRPBF FAQ
1.How can I place an order for LTC1522IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1522IS8#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 LTC1522IS8#TRPBF reliable?
The price and inventory of LTC1522IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1522IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1522IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1522IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1522IS8#TRPBF?
LTC1522IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1522IS8#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 LTC1522IS8#TRPBF?
For technical support, including LTC1522IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1522IS8#TRPBF requirements.
6.How does Aetrix verify that LTC1522IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1522IS8#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 LTC1522IS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1522IS8#TRPBF?
All LTC1522IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1522IS8#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 LTC1522IS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1522IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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