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Analog Devices Inc. LTC1522CMS8#PBF
- Part No.:
- LTC1522CMS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1522CMS8#PBF.pdf
- Description:
- IC REG CHARGE PUMP 5V 20MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:400
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Product details
Overview
LTC1522CMS8#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 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 where board space and quiescent power are critical.
For engineers reviewing the LTC1522CMS8#PBF datasheet, LTC1522CMS8#PBF pinout, LTC1522CMS8#PBF application, or LTC1522CMS8#PBF equivalent, key selection criteria include its 700kHz internal oscillator, thermal/short-circuit protection, load-disconnect capability during shutdown, and compatibility with ultralow-IQ operation down to 2.1µA via SHDN modulation.
Technical Context
The LTC1522CMS8#PBF uses a two-phase nonoverlapping switched-capacitor charge pump architecture with internal hysteresis-based regulation. Output voltage is sensed via an on-chip resistor divider, triggering charge cycles when VOUT drops below 4.8V and disabling the pump once it reaches 5.2V.
It integrates CMOS-level SHDN control with ~VIN/2 threshold, supports active-high logic drive beyond VIN, and features automatic thermal cycling (trip at ≈160°C, recovery at ≈145°C) under continuous VOUT-to-GND short conditions - all while maintaining full disconnect between VIN and VOUT in shutdown mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5V ±4% (4.8V–5.2V), regulated across 2.7V–5V input and 0–20mA load |
| Input Voltage Range | 2.7V to 5V - enables direct use with Li-ion, NiMH, or 3.3V system rails |
| Operating Supply Current | 6µA typical (no load), enabling multi-year battery life in always-on sensor nodes |
| Shutdown Current | <1µA (VIN ≤ 3.6V), fully isolating load from input supply |
| Switching Frequency | 700kHz free-running oscillator - allows compact 0.22µF flying capacitor and minimal EMI filtering |
| Output Current Capability | 10mA (VIN ≥ 2.7V), 20mA (VIN ≥ 3V) - sufficient for SIM card, smart card, and PCMCIA 5V local supplies |
| Output Ripple | 70mVP-P max (VIN = 3V, IOUT = 10mA, COUT = 10µF) - compatible with noise-sensitive analog circuitry |
| Efficiency | 82% typical (VIN = 3V, IOUT = 10mA) - maintains >75% efficiency down to 10µA load via SHDN modulation |
Pinout & Package
The LTC1522CMS8#PBF is housed in an 8-pin MSOP (MS8) package measuring 3.0mm × 3.0mm × 0.85mm, with exposed pad for thermal enhancement and RoHS-compliant matte tin lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1, Pin 8 | NC | No internal connection - must be left unconnected or tied to GND per layout best practice |
| Pin 2 | VIN | Main input supply (2.7V–5V); requires ≥3.3µF low-ESR bypass capacitor close to pin |
| Pin 3 | VOUT | Regulated 5V output; disconnected from VIN during shutdown; requires ≥3.3µF low-ESR capacitor |
| Pin 4 | C+ | Positive terminal of flying capacitor (0.22µF typical); connects to internal S2A/S1B switches |
| Pin 5 | C− | Negative terminal of flying capacitor; connects to internal S2B/S1A switches |
| Pin 6 | GND | Analog and power ground reference; must connect directly to low-impedance ground plane |
| Pin 7 | SHDN | Active-high CMOS shutdown input; threshold ≈VIN/2; must not be floated - tie to GND or logic driver |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 6µA typical operating ICC enables >10-year coin-cell operation in maintenance-free IoT sensors |
| Integrated short-circuit protection | Survives indefinite VOUT-to-GND shorts via thermal cycling without latch-up or damage |
| No-inductor design | Eliminates magnetic components and EMI concerns - simplifies layout and reduces BOM count by 3 parts |
| Load disconnect in shutdown | Prevents backfeed and leakage through VOUT, critical for battery isolation in portable medical devices |
| Ultralow-IQ modulated operation | Enables 2.1µA effective no-load current using 2Hz–100Hz SHDN pulsing - extends shelf life of sealed products |
| Compact footprint | Full solution occupies <0.1 in² (65 mm²) - fits within tight SIM card module envelopes |
Applications
| Smart Card Readers | SIM Interface Supplies |
|---|---|
Use Scenario: Powering ISO 7816-compliant contact smart cards in point-of-sale terminals and access control systems. IC Role / Device Role / Timing Role: Regulated 5V supply generator with load-disconnect safety during card insertion/removal. Use Value: Ensures compliance with ISO 7816-3 voltage tolerance (5V ±10%) while drawing <6µA standby current - eliminates need for external LDO sequencing. |
Use Scenario: Providing programmable 5V/3V SIM power in GSM cellular handsets and M2M modules. IC Role / Device Role / Timing Role: Dual-rail charge pump delivering stable 5V for SIM VCC with SHDN-controlled rail switching. Use Value: Supports TRUTH TABLE-based 3V/5V selection (via external FETs) and shutdown during idle - meets 3GPP TS 27.007 SIM power requirements. |
| Li-Ion Battery Backup Supplies | PCMCIA Local 5V Supplies |
Use Scenario: Maintaining real-time clock (RTC) and SRAM backup during main power loss in industrial controllers. IC Role / Device Role / Timing Role: Low-IQ 5V regulator powered from single-cell Li-ion (2.7V–4.2V). Use Value: Delivers 5V ±4% over full battery discharge curve with <1µA shutdown draw - extends backup runtime by 3× vs standard LDOs. |
Use Scenario: Generating local 5V for PCMCIA Type II card slots in embedded laptops and docking stations. IC Role / Device Role / Timing Role: Compact, capacitor-only DC/DC converter meeting PCMCIA JEIDA 4.2 power ramp and ripple specs. Use Value: Meets 50mVP-P ripple limit at 20mA with 10µF ceramic COUT - avoids inductor-induced noise in high-speed data interfaces. |
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 pinout, wider 2V–5V input range, higher 50mA output at VIN ≥ 3V; no ultralow-IQ modulated mode | Preferred for higher-current loads (>20mA) but lacks sub-2.1µA no-load capability | Select when output current >20mA is required and input may drop below 2.7V |
| LTC1517-5CS6#TRMPBF | SOT-23-5 package, no SHDN pin, fixed 5V output, 6µA ICC, 20mA IOUT (VIN ≥ 3V) | Used where board space is more constrained than shutdown control necessity - e.g., wearables | Select when shutdown functionality is unnecessary and PCB area is premium |
Compared with LTC1522CMS8#PBF, LTC1516CS8#PBF offers greater input flexibility and output current but sacrifices ultralow-noise modulated operation; LTC1517-5CS6#TRMPBF trades pin count and shutdown control for ultra-small footprint - making LTC1522CMS8#PBF optimal for space-constrained, battery-critical designs requiring both precision regulation and intelligent power gating.
Availability
LTC1522CMS8#PBF is available at Aetrix Electronics and suitable for SIM interface supplies, smart card readers, and Li-ion battery backup systems requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for LTC1522CMS8#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, documentation, and manufacturing continuity for all Linear legacy parts including the LTC series.
The LTC1522CMS8#PBF belongs to Linear's micropower charge pump DC/DC converter family, engineered specifically for ultra-low-power, capacitor-based voltage boosting in portable and battery-operated equipment where inductors are undesirable.
FAQ
What is the minimum input voltage required for the LTC1522CMS8#PBF to deliver 10mA output current?
The LTC1522CMS8#PBF requires a minimum input voltage of 2.7V to sustain 10mA output current while maintaining 5V ±4% regulation. Below this threshold, output voltage droops outside specification, and the device may cease regulation entirely. This makes LTC1522CMS8#PBF well-suited for single-cell Li-ion (2.7V–4.2V) and NiMH battery systems where deep discharge operation is needed.
Can the LTC1522CMS8#PBF operate with a flying capacitor smaller than 0.22µF?
Yes - the LTC1522CMS8#PBF supports flying capacitor values from 0.01µF to 0.22µF. Using 0.01µF–0.047µF reduces output ripple in ultralow-load (<10µA) or high-input-voltage (>3.3V) conditions, but at the cost of reduced maximum output current and lower efficiency. The standard 0.22µF value balances ripple, current capability, and efficiency for most applications.
Does the LTC1522CMS8#PBF require external compensation components?
No, the LTC1522CMS8#PBF is internally compensated and requires no external resistors or capacitors for loop stability. Its hysteresis-based regulation and fixed-frequency 700kHz oscillator eliminate the need for feedback networks or compensation pins - simplifying design and reducing bill-of-materials count to just three external capacitors.
How does the LTC1522CMS8#PBF behave during a continuous VOUT-to-GND short circuit?
During a continuous VOUT-to-GND short, the LTC1522CMS8#PBF draws 100–200mA from VIN and cycles into thermal shutdown when junction temperature exceeds ≈160°C, then re-enables when temperature falls to ≈145°C. This safe, non-latching behavior prevents damage and allows automatic recovery once the short is removed - a key reliability feature for unattended embedded systems.
Is the LTC1522CMS8#PBF pin-compatible with other members of the LTC15xx charge pump family?
Yes - the LTC1522CMS8#PBF is explicitly pin-compatible with the LTC1516 in applications where VIN ≥ 2.7V and IOUT ≤ 20mA, sharing identical MSOP-8 and SO-8 footprints and pin functions. This allows direct substitution in existing layouts without PCB revision, provided input voltage and load requirements align with LTC1522CMS8#PBF specifications.
LTC1522CMS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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-MSOP
LTC1522CMS8#PBF FAQ
1.How can I place an order for LTC1522CMS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1522CMS8#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 LTC1522CMS8#PBF reliable?
The price and inventory of LTC1522CMS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1522CMS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1522CMS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1522CMS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1522CMS8#PBF?
LTC1522CMS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1522CMS8#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 LTC1522CMS8#PBF?
For technical support, including LTC1522CMS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1522CMS8#PBF requirements.
6.How does Aetrix verify that LTC1522CMS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1522CMS8#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 LTC1522CMS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1522CMS8#PBF?
All LTC1522CMS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1522CMS8#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 LTC1522CMS8#PBF part is unused and in its original packaging.
Return procedure for LTC1522CMS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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