My Inquiry
My Account
Analog Devices Inc. LTC1522CS8#TRPBF
- Part No.:
- LTC1522CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1522CS8#TRPBF.pdf
- Description:
- IC REG CHARGE PUMP 5V 20MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,029
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC1522CS8#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 and <1µA in shutdown, and requires just three external capacitors - making it ideal for SIM interface supplies and smart card readers.
For engineers reviewing the LTC1522CS8#TRPBF datasheet, LTC1522CS8#TRPBF pinout, LTC1522CS8#TRPBF application, or LTC1522CS8#TRPBF equivalent, key selection criteria include ultralow quiescent current, thermal/short-circuit protection, 700kHz internal oscillator, regulated output without inductors, and compatibility with light-load GSM and PCMCIA power rails.
Technical Context
The LTC1522CS8#TRPBF uses a two-phase nonoverlapping switched-capacitor topology to boost input voltage and regulate VOUT via internal hysteresis sensing (COMP1). Regulation occurs by enabling the charge pump when VOUT falls below the lower trip point and disabling it upon reaching the upper trip point - achieving 5V ±4% accuracy across 2.7V–5V input and up to 20mA load.
It integrates CMOS-level SHDN control with VIN/2 threshold, disconnects VOUT from VIN during shutdown, and features on-chip thermal shutdown (~160°C trip, ~145°C recovery) that enables indefinite cycling under continuous short-circuit conditions without latchup or damage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0V ±4% - tightly regulated rail suitable for SIM I/O, smart card logic, and 5V microcontroller peripherals. |
| Input Voltage Range | 2.7V to 5V - supports single-cell Li-ion, NiMH, and 3.3V system rails without external LDO pre-regulation. |
| Operating Supply Current | 6µA typical at no load - enables multi-year battery life in always-on low-duty-cycle devices like smart cards. |
| Shutdown Current | <1µA at VIN ≤ 3.6V - ensures negligible drain during standby or sleep modes. |
| Switching Frequency | 700kHz free-running - allows use of small 0.22µF flying capacitor and minimizes EMI filtering burden. |
| Max Output Current | 20mA at VIN ≥ 3V - sufficient for GSM SIM interface, PCMCIA local 5V, and backup supply applications. |
| Output Ripple | 70mVP-P at VIN = 3V, IOUT = 10mA - manageable with 10µF low-ESR ceramic/tantalum output capacitor. |
Pinout & Package
Package: 8-pin SO (Small Outline, narrow 0.150", JEDEC MS-012), 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 | Accepts 2.7V–5V; requires ≥3.3µF low-ESR bypass capacitor close to pin for stability. |
| Pin 3: VOUT | Regulated 5V Output | Delivers 5V ±4% output; disconnected from VIN during shutdown; bypass with ≥3.3µF low-ESR cap. |
| Pin 4: C+ | Flying Cap Positive Terminal | Connects to positive plate of 0.22µF flying capacitor; critical for charge transfer timing and efficiency. |
| Pin 5: C− | Flying Cap Negative Terminal | Connects to negative plate of flying capacitor; forms charge pump switching node with C+. |
| Pin 6: GND | Ground Reference | Primary return path for all internal circuits and external capacitors; tie directly to ground plane. |
| Pin 7: SHDN | Active-High Shutdown Control | CMOS input with ~VIN/2 threshold; drive low to enable, high to disable; must not be floated. |
| Pin 8: NC | No Connect | Unbonded pad - left open; no electrical function or mechanical constraint. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 6µA typical operating ICC enables >10-year battery life in 10µA-average-load smart card readers. |
| Thermal + short-circuit protection | On-die thermal shutdown cycles indefinitely under VOUT-to-GND short, preventing device failure. |
| No inductors required | Capacitive charge pump architecture eliminates magnetic components, reducing BOM cost and EMI risk. |
| Pin-compatible with LTC1516 | Enables drop-in upgrade in VIN ≥ 2.7V / IOUT ≤ 20mA designs without PCB revision. |
| Compact layout footprint | Full solution occupies <0.1 in² - fits space-constrained SIM card sockets and PCMCIA Type II modules. |
Applications
| Application 1 | Application 2 |
|---|---|
Use Scenario: Powering SIM card interface circuitry in GSM cellular handsets requiring dual 3V/5V rail generation. IC Role / Device Role / Timing Role: Regulated 5V supply for SIM VCC, controlled via SHDN by baseband processor to manage power states. Use Value: Enables programmable 5V/3V SIM supply (per TRUTH TABLE in datasheet) with <1µA shutdown leakage, extending talk time. |
Use Scenario: Providing backup 5V rail for real-time clocks or SRAM in portable medical devices powered by Li-ion cells. IC Role / Device Role / Timing Role: Standby power source maintaining memory and timekeeping during main system shutdown. Use Value: 6µA no-load ICC preserves battery capacity over months of storage; thermal protection prevents fault propagation. |
| Application 3 | Application 4 |
Use Scenario: Generating local 5V supply from 3.3V system rail in PCMCIA Type II host adapters. IC Role / Device Role / Timing Role: Compact DC/DC converter replacing discrete charge pump solutions in legacy PCMCIA slots. Use Value: Eliminates inductor placement constraints and reduces board area by >40% versus inductive buck-boost alternatives. |
Use Scenario: Powering contact-based smart card readers in point-of-sale terminals and access control systems. IC Role / Device Role / Timing Role: Primary 5V regulator for ISO/IEC 7816-3 compliant card interface, synchronized to card reset timing. Use Value: 5V ±4% tolerance meets smart card VCC specification; 20mA output supports full-speed card protocols. |
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 2V–5V input range; higher 50mA output at VIN ≥ 3V; no ultralow IQ mode. | Preferred where input may dip below 2.7V or >20mA load needed; unsuitable for sub-10µA standby optimization. | Select LTC1516CS8#PBF if VIN can fall to 2V or peak load exceeds 20mA; otherwise LTC1522CS8#TRPBF offers better efficiency at light loads. |
| LTC1517-5CS5#TRMPBF | SOT-23-5 package; no SHDN pin; fixed 5V output; 6µA ICC; same 2.7V–5V input and 20mA capability. | Used where board space is extremely limited and shutdown control is unnecessary (e.g., always-on backup rails). | Choose LTC1517-5CS5#TRMPBF only for space-constrained, non-shutdown applications; LTC1522CS8#TRPBF retains full control flexibility in SO-8. |
Compared with LTC1516CS8#PBF and LTC1517-5CS5#TRMPBF, the LTC1522CS8#TRPBF uniquely balances ultralow 6µA operating current, active shutdown control, and SO-8 manufacturability - making it optimal for battery-sensitive, intermittently active applications like SIM interfaces and smart card readers.
Availability
LTC1522CS8#TRPBF is available at Aetrix Electronics and suitable for GSM cellular telephone SIM supplies, Li-ion battery backup systems, PCMCIA local 5V generation, and smart card reader power rails requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1522CS8#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's legacy ICs are fully supported with datasheets, SPICE models, and application notes.
The LTC1522CS8#TRPBF belongs to Linear's micropower DC/DC converter product line, engineered specifically for ultra-low-power, inductorless voltage boosting in portable and battery-operated systems.
FAQ
What is the maximum output current capability of the LTC1522CS8#TRPBF?
The LTC1522CS8#TRPBF delivers up to 10mA when VIN ≥ 2.7V and up to 20mA when VIN ≥ 3V, per the Electrical Characteristics table. This is verified across the commercial temperature range (0°C to 70°C) with 10µF input/output capacitors and 0.22µF flying capacitor. Exceeding these limits causes output voltage droop or thermal shutdown activation.
Does the LTC1522CS8#TRPBF require an inductor in its application circuit?
No, the LTC1522CS8#TRPBF uses a switched-capacitor (charge pump) architecture and requires only three external capacitors: one 0.22µF flying capacitor (CFLY) and two 10µF bypass capacitors (CIN and COUT). Inductors are explicitly unnecessary, simplifying layout and eliminating magnetic EMI concerns.
How does shutdown operation affect the load connection in the LTC1522CS8#TRPBF?
In shutdown mode, the LTC1522CS8#TRPBF actively disconnects the load from VIN using internal switches - ensuring zero current flows from the input supply to VOUT. This isolation prevents backfeed and preserves battery charge, unlike basic enable/disable regulators that leave the output path conductive.
Can the LTC1522CS8#TRPBF be used with input voltages below 2.7V?
No - the absolute minimum input voltage for functional regulation is 2.7V, as specified in both Absolute Maximum Ratings and Electrical Characteristics. Operation below 2.7V results in unregulated output, increased ripple, and potential failure to start. For sub-2.7V inputs, consider the pin-compatible LTC1516 (2V min).
What is the purpose of the NC pins (1 and 8) on the LTC1522CS8#TRPBF SO-8 package?
Pins 1 and 8 of the LTC1522CS8#TRPBF are No Connect (NC) terminals - they are unconnected to any internal circuitry and serve no electrical function. They must remain unconnected on the PCB; routing traces or applying solder paste to these pads is unnecessary and may compromise thermal or mechanical reliability.
LTC1522CS8#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
LTC1522CS8#TRPBF FAQ
1.How can I place an order for LTC1522CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1522CS8#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 LTC1522CS8#TRPBF reliable?
The price and inventory of LTC1522CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1522CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1522CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1522CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1522CS8#TRPBF?
LTC1522CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1522CS8#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 LTC1522CS8#TRPBF?
For technical support, including LTC1522CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1522CS8#TRPBF requirements.
6.How does Aetrix verify that LTC1522CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1522CS8#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 LTC1522CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1522CS8#TRPBF?
All LTC1522CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1522CS8#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 LTC1522CS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1522CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC1522CS8#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
