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Analog Devices Inc. LTC1751EMS8-3.3#TRPBF
- Part No.:
- LTC1751EMS8-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1751EMS8-3.3#TRPBF.pdf
- Description:
- IC REG CHG PUMP 3.3V 100MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,417
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Product details
Overview
LTC1751EMS8-3.3#TRPBF from Analog Devices (formerly Linear Technology) is a micropower, regulated charge pump DC/DC converter delivering a stable 3.3V ±4% output at up to 80mA with input voltage as low as 2.5V. It features 20µA quiescent current, 800kHz switching frequency, and integrated short-circuit/thermal protection. It is used in Li-ion battery backup supplies and smart card readers where ultra-low power and inductorless operation are critical.
For engineers reviewing the LTC1751EMS8-3.3#TRPBF datasheet, LTC1751EMS8-3.3#TRPBF pinout, LTC1751EMS8-3.3#TRPBF application, or LTC1751EMS8-3.3#TRPBF equivalent, key selection considerations include regulated 3.3V output capability under 2.5V–4.4V input, PGOOD fault monitoring, soft-start programmability, and MSOP-8 package compatibility for space-constrained portable designs.
Technical Context
The LTC1751EMS8-3.3#TRPBF operates in Burst Mode™ switched-capacitor voltage doubling topology to achieve ultralow quiescent current. Regulation is implemented via internal hysteresis comparator sensing VOUT through a fixed resistor divider, enabling/disabling the charge pump based on output deviation from 3.3V ±4%.
It integrates PGOOD open-drain status signaling with –7% undervoltage detection threshold, active-low CMOS-compatible SHDN with 0.3V/1.5V thresholds, and SS pin-controlled soft-start using external capacitor timing. Thermal shutdown activates at ~160°C and recovers at ~150°C, allowing safe indefinite short-circuit survival.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V ±4% - tightly regulated rail suitable for 3.3V logic and analog circuitry without external feedback. |
| Max Output Current | 80mA @ VIN ≥ 2.5V - sufficient for low-power microcontrollers, sensors, and interface ICs in portable systems. |
| Quiescent Current | 20µA typical - enables multi-year battery life in always-on backup and monitoring applications. |
| Input Voltage Range | 2.5V to 4.4V - supports single-cell Li-ion (2.7–4.2V), NiMH/NiCd (2.4–3.6V), and regulated 3.3V supply inputs. |
| Switching Frequency | 800kHz - enables use of small 1µF ceramic flying capacitor and minimizes EMI compared to lower-frequency pumps. |
| Shutdown Current | <2µA - ensures near-zero drain during system sleep, critical for energy harvesting and long-duration standby. |
| PGOOD Threshold | –7% UVL (undervoltage lockout) - provides reliable system reset or fault flagging when VOUT drops below 3.07V. |
Pinout & Package
Package: 8-pin MSOP (3mm × 3mm, 0.65mm pitch), thermally enhanced with exposed pad (not electrically connected in standard variant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - PGOOD | Open-drain output status indicator | Signals VOUT regulation validity (high-Z) or undervoltage fault (low); requires external pull-up for logic-level interfacing. |
| 2 - VOUT | Regulated 3.3V output | Must be bypassed with ≥6.8µF low-ESR ceramic capacitor placed adjacent to pin for ripple suppression and stability. |
| 3 - VIN | Main input supply (2.5–4.4V) | Requires ≥6.8µF low-ESR ceramic bypass; high-impedance source impedance may necessitate larger CIN. |
| 4 - GND | Power and signal reference ground | Must connect directly to solid ground plane to minimize noise coupling and support thermal dissipation. |
| 5 - C– | Flying capacitor negative terminal | Connects to negative side of non-polarized 1µF ceramic flying capacitor; polarity reversal prohibits tantalum/aluminum use. |
| 6 - C+ | Flying capacitor positive terminal | Connects to positive side of same flying capacitor; forms charge-transfer path with C– during 2-phase clock cycle. |
| 7 - SHDN | Active-low enable/disable control | CMOS input with 0.3V/1.5V thresholds; must be driven - floating state causes undefined operation. |
| 8 - SS | Soft-start timing input | 2µA current source ramps voltage; 4.7nF yields ~2.8ms 10–90% VOUT rise time, limiting inrush current into output capacitance. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates magnetic components, reducing BOM cost, board area, and EMI concerns in compact portable layouts. |
| Integrated PGOOD monitoring | Provides system-level power-good assertion and undervoltage fault detection without external comparators or resistors. |
| Adjustable soft-start | External capacitor on SS pin controls start-up slew rate, preventing input supply sag and load transient issues during power-on. |
| Thermal shutdown with auto-recovery | Protects against sustained overloads by cycling charge pump on/off at ~160°C/150°C junction temperatures. |
| Ultra-low shutdown disconnect | Shuts down all internal circuitry and isolates VOUT from VIN, ensuring zero load current during deep sleep modes. |
Applications
| Li-Ion Battery Backup Supply | Smart Card Reader Power |
|---|---|
Use Scenario: Maintaining real-time clock and SRAM retention during main power loss in handheld POS terminals. IC Role / Device Role / Timing Role: Regulated 3.3V charge pump supplying backup rail from partially discharged Li-ion cell (2.7–3.6V). Use Value: 20µA quiescent current extends battery life beyond 5 years; PGOOD enables automatic switchover detection and system reset coordination. |
Use Scenario: Providing isolated 3.3V VCC to ISO/IEC 7816-compliant smart card interface in secure access devices. IC Role / Device Role / Timing Role: Primary 3.3V regulator powering card controller and level-shifting circuitry during insertion and communication. Use Value: MSOP-8 footprint fits tight card slot PCBs; 800kHz operation avoids interference with 1–5MHz card clock signals; thermal protection prevents latch-up during hot-plug events. |
| PCMCIA Local 5V Supply | White LED Backlighting |
Use Scenario: Generating local 3.3V bias for PCMCIA socket control logic and card-detect circuitry in legacy laptop expansion bays. IC Role / Device Role / Timing Role: Secondary regulated supply derived from main 5V rail or battery, independent of host CPU power states. Use Value: Input range down to 2.5V allows operation during brown-out conditions; shutdown disconnect prevents backfeed into main 5V bus during sleep. |
Use Scenario: Driving 2–4 white LEDs in ultra-thin medical display modules powered by single-cell Li-ion. IC Role / Device Role / Timing Role: Constant-voltage source feeding external current-limiting resistors or PWM-controlled LED strings. Use Value: Low output ripple (<68mVP-P @ 40mA) prevents visible LED flicker; soft-start eliminates flash-on-power artifacts in clinical environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar regulated charge pump applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1754-5 | Fixed 5V output; SOT-23-5 package; 13µA IQ; 50mA max IOUT | Not suitable for 3.3V systems; smaller footprint but no PGOOD or soft-start | Select only if 5V output and minimal board area are primary constraints and fault monitoring is handled externally. |
| LTC1517-3.3 | Fixed 3.3V output; 6µA IQ; 20mA max IOUT; no PGOOD or thermal protection | Lower power but severely limited current drive; lacks safety features required for robust backup rails | Consider only for ultra-low-current sensor biasing where 20mA suffices and fault tolerance is not required. |
Compared with LTC1754-5 and LTC1517-3.3, the LTC1751EMS8-3.3#TRPBF uniquely balances 80mA output, 3.3V regulation, PGOOD monitoring, and thermal resilience in an industry-standard MSOP-8 - making it the only option among the three qualified for mission-critical backup and smart-card power delivery.
Availability
LTC1751EMS8-3.3#TRPBF is available at Aetrix Electronics and suitable for Li-ion battery backup supplies, smart card readers, PCMCIA local 3.3V/5V conversion, and white LED backlighting requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LTC1751EMS8-3.3#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 the LTC portfolio.
The LTC1751EMS8-3.3#TRPBF belongs to Linear's micropower charge pump family, designed specifically for inductorless, low-noise, battery-operated power conversion in portable and security-critical applications.
FAQ
What is the minimum input voltage required for the LTC1751EMS8-3.3#TRPBF to deliver rated 80mA output?
The LTC1751EMS8-3.3#TRPBF requires VIN ≥ 2.5V to sustain 80mA output current while maintaining 3.3V ±4% regulation. Below 2.5V, output current capability degrades progressively; at VIN = 2.0V, maximum supported load is approximately 40mA per electrical characteristics table. Operation below 2.5V is permissible but must be validated for specific load and temperature conditions.
Does the LTC1751EMS8-3.3#TRPBF require external feedback resistors to set its output voltage?
No, the LTC1751EMS8-3.3#TRPBF does not require external feedback resistors. It integrates a precision internal resistor divider calibrated to regulate VOUT to 3.3V ±4%. The FB pin is absent on this variant - only the base LTC1751 (non-suffixed) uses FB for adjustable output. Using external resistors with LTC1751EMS8-3.3#TRPBF is neither necessary nor supported.
Can the PGOOD pin of the LTC1751EMS8-3.3#TRPBF be left unconnected if not used?
No, the PGOOD pin of the LTC1751EMS8-3.3#TRPBF must not be left floating. If unused, it should be connected directly to GND. Leaving it open may cause unpredictable behavior due to leakage currents or noise coupling, potentially interfering with internal comparator operation or causing false fault assertions during startup or transient events.
What is the recommended flying capacitor type and value for the LTC1751EMS8-3.3#TRPBF?
The LTC1751EMS8-3.3#TRPBF requires a non-polarized 1µF X7R ceramic flying capacitor (e.g., Murata GRM39X5R105K6.3AJ). Polarized capacitors (tantalum, aluminum) are strictly prohibited due to voltage reversal during charge-pump phase switching. X7R ensures stable capacitance across –40°C to +85°C and minimal voltage coefficient, preserving 80mA output capability under all operating conditions.
How does the LTC1751EMS8-3.3#TRPBF behave during a continuous VOUT-to-GND short circuit?
During a continuous VOUT-to-GND short, the LTC1751EMS8-3.3#TRPBF draws 200–400mA from VIN, triggering thermal shutdown at ~160°C junction temperature. It then cycles autonomously - disabling the charge pump until junction cools to ~150°C, then re-enabling - repeating indefinitely without damage. PGOOD remains low throughout, providing a reliable fault flag for system-level diagnostics.
LTC1751EMS8-3.3#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-Up
- Output Configuration:
- Positive
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 100mA
- Frequency - Switching:
- 800kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LTC1751EMS8-3.3#TRPBF FAQ
1.How can I place an order for LTC1751EMS8-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1751EMS8-3.3#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 LTC1751EMS8-3.3#TRPBF reliable?
The price and inventory of LTC1751EMS8-3.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1751EMS8-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1751EMS8-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1751EMS8-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1751EMS8-3.3#TRPBF?
LTC1751EMS8-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1751EMS8-3.3#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 LTC1751EMS8-3.3#TRPBF?
For technical support, including LTC1751EMS8-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1751EMS8-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC1751EMS8-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1751EMS8-3.3#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 LTC1751EMS8-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1751EMS8-3.3#TRPBF?
All LTC1751EMS8-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1751EMS8-3.3#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 LTC1751EMS8-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC1751EMS8-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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