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Analog Devices Inc. LTC1911EMS8-1.8#TRPBF
- Part No.:
- LTC1911EMS8-1.8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1911EMS8-1.8#TRPBF.pdf
- Description:
- IC REG CHG PUMP 1.8V 250MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,622
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Product details
Overview
LTC1911EMS8-1.8#TRPBF from Analog Devices (formerly Linear Technology) is a switched-capacitor step-down DC/DC converter delivering a regulated 1.8V ±4% output from 2.7V–5.5V input, supporting up to 250mA load current with no inductor required. It employs constant-frequency (1.5MHz) fractional charge-pump conversion across three modes (2:1, 3:2, 1:1), achieves >25% higher efficiency than LDOs, and integrates soft-start, shutdown, short-circuit, and overtemperature protection - ideal for space-constrained battery-powered handheld medical instruments and smart card readers.
For engineers reviewing the LTC1911EMS8-1.8#TRPBF datasheet, LTC1911EMS8-1.8#TRPBF pinout, LTC1911EMS8-1.8#TRPBF application, or LTC1911EMS8-1.8#TRPBF equivalent, key selection considerations include its inductorless architecture, 1.5MHz fixed-frequency operation, 180µA no-load input current, ±4% output voltage tolerance at 250mA, and MSOP-8 package compatibility with tight PCB layouts.
Technical Context
The LTC1911EMS8-1.8#TRPBF uses an internal switch network and adaptive mode control (2:1, 3:2, or 1:1 step-down) to maintain regulation across varying input voltages and loads. Its constant-frequency oscillator (1.2–1.8MHz, typ 1.5MHz) enables predictable noise spectrum and simplified filtering.
Regulation is achieved by sensing VOUT and dynamically adjusting charge transfer per cycle via internal RA control; Burst Mode® activates below ~30mA load to reduce quiescent current to 10µA (shutdown) or 180µA (active no-load), while soft-start is implemented via external capacitor on SS/SHDN pin to limit inrush.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8V ±4% - ensures stable core supply for 1.8V logic in portable systems without external feedback resistors |
| Max Output Current | 250mA - supports moderate-power peripherals like smart card interfaces or low-power DSPs |
| Input Voltage Range | 2.7V to 5.5V - compatible with single-cell Li-ion (3.0–4.2V), 3-cell NiMH (3.6V), or USB-powered systems |
| Switching Frequency | 1.5MHz (typ) - enables use of small ceramic capacitors and reduces EMI filter size |
| No-Load Input Current | 180µA (typ) - extends battery life in always-on monitoring functions |
| Shutdown Current | 10µA (typ) - minimizes leakage during system sleep states |
| Output Ripple | 12mVP-P at 250mA - meets noise requirements for analog sensors and RF front-ends when paired with ≥10µF low-ESR ceramic COUT |
Pinout & Package
Package: 8-pin MSOP (3.0mm × 3.0mm × 0.85mm height), exposed pad not electrically connected, RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Input power supply | Accepts 2.7V–5.5V; requires ≥10µF ceramic bypass to ground for low-noise operation |
| C2+ (Pin 2) | Flying capacitor positive terminal | Connects to positive plate of second flying capacitor (C2); polarity-sensitive - must use non-polarized ceramic |
| C2– (Pin 3) | Flying capacitor negative terminal | Connects to negative plate of C2; reversal risks damage - ceramic only |
| GND (Pin 4) | Power and signal reference | Must connect to solid ground plane; critical for thermal performance and noise reduction |
| C1– (Pin 5) | Flying capacitor negative terminal | Connects to negative plate of first flying capacitor (C1); shares polarity constraint with C2– |
| VOUT (Pin 6) | Regulated output | Delivers 1.8V ±4%; disconnects from VIN during shutdown; requires ≥10µF low-ESR ceramic bypass |
| C1+ (Pin 7) | Flying capacitor positive terminal | Connects to positive plate of C1; forms charge-transfer path with C1– and internal switches |
| SS/SHDN (Pin 8) | Soft-start/shutdown control | Drives open-drain; <0.3V forces shutdown; capacitor to GND controls VOUT ramp rate and inrush current |
Key Features
| Feature | Design Value |
|---|---|
| Inductorless step-down conversion | Eliminates magnetic components, reducing BOM cost, board area, and EMI concerns in compact designs |
| Three-mode adaptive charge pump | Automatically selects 2:1, 3:2, or 1:1 ratio based on VIN and load to maximize efficiency across full operating range |
| Burst Mode® operation | Maintains 10µA shutdown and 180µA no-load current while delivering stable 1.8V output down to µA-level loads |
| Integrated protection | Short-circuit current limit (~600mA) and thermal shutdown (~160°C) prevent failure under fault conditions |
| Low-noise constant-frequency architecture | 1.5MHz switching enables narrowband filtering and avoids sensitive frequency bands used by RF receivers |
Applications
| Handheld Medical Instruments | Smart Card Readers |
|---|---|
Use Scenario: Portable blood glucose meters and pulse oximeters powered by single-cell Li-ion batteries requiring clean, stable 1.8V supply for microcontroller and sensor interface. IC Role / Device Role / Timing Role: Primary step-down regulator converting 3.0–4.2V battery voltage to tightly regulated 1.8V output with minimal ripple and no inductor-induced EMI. Use Value: Enables compact form factor and extended battery life via 180µA no-load current and >25% higher efficiency vs. LDO alternatives. |
Use Scenario: Contact/contactless smart card readers in point-of-sale terminals where 1.8V is required for ISO/IEC 7816-3 compliant card interface logic. IC Role / Device Role / Timing Role: Fixed-output DC/DC converter providing low-noise 1.8V rail isolated from noisy host system power, with fast transient response to card insertion events. Use Value: Delivers 250mA peak current with <12mVP-P ripple at full load, ensuring reliable card communication without voltage droop or reset glitches. |
| Cellular Phones (Baseband Subsystem) | Low-Power DSP Supplies |
Use Scenario: Powering baseband processor I/O banks or auxiliary sensors in legacy GSM/EDGE handsets using 3.6V nominal battery. IC Role / Device Role / Timing Role: Efficient, inductorless 1.8V supply enabling layout simplification and reduced EMI coupling into RF sections. Use Value: Constant 1.5MHz frequency allows predictable noise placement and easy filtering, avoiding interference with cellular band reception. |
Use Scenario: Supplying 1.8V to ultra-low-power DSPs in voice recorders or hearing aids where battery runtime and board area are critical constraints. IC Role / Device Role / Timing Role: High-efficiency step-down converter operating across wide input range (2.7–5.5V) as battery discharges, maintaining regulation without external compensation. Use Value: Achieves >80% efficiency at 100mA load and maintains regulation down to 2.7V input, extending usable battery capacity by ~35% vs. linear regulators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3250-1.5 | Fixed 1.5V output; 250mA max; 1.5MHz; ThinSOT-8 package; lower IQ (35µA active) | Designed for 1.5V logic rails; lacks soft-start pin; smaller footprint but no SS/SHDN flexibility | Select when 1.5V (not 1.8V) is required and board space is more constrained than control flexibility |
| LTC3251 | Adjustable 0.9V–1.6V output; 500mA max; 1–1.6MHz spread-spectrum; MS-10 package; ISD <1µA | Wider output range and higher current; spread-spectrum reduces EMI peaks; no fixed 1.8V option | Select when variable output or lower shutdown current is needed, but requires external resistor divider and cannot replace LTC1911EMS8-1.8#TRPBF directly |
Compared with LTC3250-1.5 and LTC3251, the LTC1911EMS8-1.8#TRPBF uniquely provides factory-trimmed 1.8V output with dedicated SS/SHDN pin for controlled inrush and shutdown sequencing - critical for systems requiring deterministic power-up behavior without external circuitry.
Availability
LTC1911EMS8-1.8#TRPBF is available at Aetrix Electronics and suitable for handheld medical instruments, smart card readers, cellular phone baseband subsystems, and low-power DSP supplies requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LTC1911EMS8-1.8#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 full product support, documentation, and manufacturing continuity for legacy Linear parts including the LTC1911 series.
The LTC1911 family was designed specifically for inductorless, high-efficiency step-down conversion in space- and noise-sensitive portable electronics - emphasizing low quiescent current, fixed-output simplicity, and robust protection in MSOP packaging.
FAQ
What is the output voltage tolerance of the LTC1911EMS8-1.8#TRPBF over temperature and load?
The LTC1911EMS8-1.8#TRPBF delivers 1.8V with ±4% tolerance across the full operating temperature range (–40°C to +85°C) and full load range (0–250mA), as verified in the Electrical Characteristics table under "VOUT" parameter with "G" designation indicating guaranteed over temperature.
Does the LTC1911EMS8-1.8#TRPBF require external feedback resistors to set output voltage?
No, the LTC1911EMS8-1.8#TRPBF is a fixed-output device with factory-trimmed 1.8V regulation; no external feedback resistors are needed. The "-1.8" suffix denotes the internal reference is trimmed to 1.8V ±4%, eliminating design complexity and component count versus adjustable regulators.
Can the LTC1911EMS8-1.8#TRPBF operate from a 2.7V input while delivering 250mA at 1.8V?
Yes, the LTC1911EMS8-1.8#TRPBF is fully specified to deliver 250mA at 1.8V with input as low as 2.7V. Its 1:1 mode operation maintains regulation down to VIN = 1.5×VOUT (2.7V), and efficiency remains competitive with LDOs in this region per Figure 1911 G05.
What type of capacitors must be used for the flying capacitors C1 and C2 in the LTC1911EMS8-1.8#TRPBF circuit?
The LTC1911EMS8-1.8#TRPBF requires non-polarized ceramic capacitors for C1 and C2 - polarized types (tantalum, aluminum) must never be used due to voltage reversal during startup. X7R or better dielectric is recommended to retain ≥0.4µF capacitance over temperature and bias.
How does the SS/SHDN pin function during startup and shutdown of the LTC1911EMS8-1.8#TRPBF?
The SS/SHDN pin on the LTC1911EMS8-1.8#TRPBF serves dual roles: pulling it below 0.3V forces shutdown (disconnecting VOUT from VIN), while connecting an external capacitor to GND enables soft-start by controlling the ramp rate of VOUT. An internal 2µA pull-up ensures automatic wake-up if left floating or driven by open-drain logic.
LTC1911EMS8-1.8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Current - Output:
- 250mA
- Frequency - Switching:
- 1.5MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LTC1911EMS8-1.8#TRPBF FAQ
1.How can I place an order for LTC1911EMS8-1.8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1911EMS8-1.8#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 LTC1911EMS8-1.8#TRPBF reliable?
The price and inventory of LTC1911EMS8-1.8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1911EMS8-1.8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1911EMS8-1.8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1911EMS8-1.8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1911EMS8-1.8#TRPBF?
LTC1911EMS8-1.8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1911EMS8-1.8#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 LTC1911EMS8-1.8#TRPBF?
For technical support, including LTC1911EMS8-1.8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1911EMS8-1.8#TRPBF requirements.
6.How does Aetrix verify that LTC1911EMS8-1.8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1911EMS8-1.8#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 LTC1911EMS8-1.8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1911EMS8-1.8#TRPBF?
All LTC1911EMS8-1.8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1911EMS8-1.8#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 LTC1911EMS8-1.8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1911EMS8-1.8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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