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Analog Devices Inc. LTC1751EMS8-3.3#PBF
- Part No.:
- LTC1751EMS8-3.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1751EMS8-3.3#PBF.pdf
- Description:
- IC REG CHG PUMP 3.3V 100MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:300
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Product details
Overview
LTC1751EMS8-3.3#PBF from Analog Devices (formerly Linear Technology) is a micropower, regulated 3.3V charge pump DC/DC converter in an 8-pin MSOP package. It delivers up to 80mA output current from inputs as low as 2.5V, features 20µA quiescent current, ±4% output regulation, and integrated PowerGood/undervoltage monitoring - ideal for Li-ion battery backup supplies and smart card readers.
For engineers reviewing the LTC1751EMS8-3.3#PBF datasheet, LTC1751EMS8-3.3#PBF pinout, LTC1751EMS8-3.3#PBF application, or LTC1751EMS8-3.3#PBF equivalent, key selection criteria include regulated 3.3V output tolerance, ultralow shutdown current (<2µA), PGOOD fault signaling, soft-start programmability, and inductorless operation in space-constrained portable systems.
Technical Context
The LTC1751EMS8-3.3#PBF implements a Burst Mode™ switched-capacitor voltage doubler architecture with hysteresis-based regulation, enabling ultralow 20µA no-load current. Its internal comparator monitors VOUT via fixed resistive divider and enables/disables the charge pump based on upper/lower trip thresholds (±4.5% and ±7% of nominal).
It integrates dedicated terminals for flying capacitor (C+, C–), active-low CMOS shutdown (SHDN), open-drain PGOOD status output, and soft-start timing (SS). Thermal shutdown activates at ~160°C and cycles autonomously under sustained short-circuit conditions without latchup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V ±4% - tightly regulated for powering 3.3V logic rails and peripherals without external feedback. |
| Max Output Current | 80mA at VIN ≥ 2.5V - sufficient for low-power microcontrollers, sensors, and interface ICs in battery-powered devices. |
| Quiescent Current | 20µA typical - enables multi-year operation from coin cells or primary batteries in standby mode. |
| Shutdown Current | <2µA - ensures near-zero drain during system sleep, critical for energy harvesting and IoT endpoints. |
| Switching Frequency | 800kHz - allows use of small 1µF ceramic flying capacitors and minimizes EMI compared to lower-frequency charge pumps. |
| Input Voltage Range | 2V to 4.4V - compatible with single-cell Li-ion (2.7–4.2V), NiMH (2.4–3.0V), and alkaline (2–3.2V) sources. |
| PGOOD Thresholds | UVL = –7%, UVH = –4.5% - provides reliable undervoltage detection with hysteresis to prevent chatter during brownout recovery. |
Pinout & Package
Package: 8-lead plastic MSOP (MS8), 3.0mm × 3.0mm × 0.86mm body, exposed pad not electrically connected. Pin 1 marked by dot; pin numbering counterclockwise from top-left corner when viewed from top.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PGOOD) | Open-drain status output | Signals valid regulation (high-Z) or undervoltage fault (low); requires external pull-up for logic-level interfacing. |
| 2 (VOUT) | Regulated 3.3V output | Delivers up to 80mA; must be bypassed with ≥6.8µF low-ESR ceramic capacitor adjacent to pin. |
| 3 (VIN) | Main input supply | Accepts 2V–4.4V; requires ≥6.8µF low-ESR ceramic bypass capacitor close to pin. |
| 4 (GND) | Analog/digital ground reference | Must connect directly to solid ground plane; serves as thermal path and noise reference for regulation loop. |
| 5 (C–) | Flying capacitor negative terminal | Connects to negative side of non-polarized 1µF ceramic flying capacitor; voltage reverses during switching cycle. |
| 6 (C+) | Flying capacitor positive terminal | Connects to positive side of same flying capacitor; forms charge-transfer path with C– and internal switches. |
| 7 (SHDN) | Active-low enable control | CMOS input with VIH = 1.5V, VIL = 0.3V; must be driven - never left floating - to avoid undefined state. |
| 8 (SS) | Soft-start timing node | Sinks 2µA current; external capacitor sets VOUT ramp time (tr = 0.6ms/nF × CSS) to limit inrush current. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor topology | Eliminates magnetic components and associated EMI, size, and cost - enables ultra-thin PCB designs for wearables and smart cards. |
| Integrated PGOOD monitoring | Provides system-level power sequencing and fault reporting without external comparators or discrete logic. |
| Adjustable soft-start | Prevents input voltage sag and large inrush currents during startup - protects source battery and avoids brownout resets. |
| Short-circuit & thermal protection | Survives indefinite VOUT-to-GND shorts with automatic thermal cycling - no external current limiting required. |
| Ultralow shutdown disconnect | Isolates VOUT from VIN during shutdown, preventing backfeed and ensuring true zero-load condition for battery longevity. |
Applications
| Li-Ion Battery Backup Supply | Smart Card Reader Power |
|---|---|
Use Scenario: Providing stable 3.3V rail during main power loss in secure access terminals using single-cell Li-ion as backup. IC Role / Device Role / Timing Role: Regulated charge pump converter delivering continuous 3.3V output while drawing <20µA from depleted cell (2.5V). Use Value: Extends backup runtime beyond 100 hours; eliminates need for bulky LDOs or inefficient boost converters. |
Use Scenario: Powering ISO 7816-compliant smart card interfaces in point-of-sale and ID verification devices. IC Role / Device Role / Timing Role: Generates precise 3.3V supply meeting EMVCo voltage tolerance requirements during card insertion and data exchange. Use Value: Ensures reliable card communication across full temperature range (–40°C to +85°C) with no external compensation. |
| PCMCIA Local 5V Supply | White LED Backlighting |
Use Scenario: Generating local 3.3V logic supply from PCMCIA slot's 3.3V or 5V bus in legacy laptop expansion cards. IC Role / Device Role / Timing Role: Low-noise, inductorless regulator decoupling host bus from peripheral logic load transients. Use Value: Prevents bus voltage droop during high-speed data bursts; meets PCMCIA JEIDA spec for supply stability. |
Use Scenario: Driving 2–4 white LEDs in handheld medical displays where battery life and board area are constrained. IC Role / Device Role / Timing Role: Provides constant-voltage source for LED string with PWM-dimmable brightness via SHDN pin toggling. Use Value: Enables >1000:1 dimming ratio using only one external resistor; avoids flicker due to 800kHz switching frequency. |
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; max 50mA @ VIN ≥ 2V | Not suitable for 3.3V systems; smaller footprint but lower current capability | Select when 5V-only output and minimal board area outweigh need for 3.3V compatibility and higher current. |
| LTC1517-3.3 | Fixed 3.3V output; 6µA IQ; max 20mA @ VIN ≥ 2.7V; no PGOOD or soft-start | Lacks fault monitoring and inrush control; insufficient for >40mA loads | Choose only for ultra-low-power sensor nodes where 20mA suffices and PGOOD is unnecessary. |
Compared with LTC1754-5 and LTC1517-3.3, the LTC1751EMS8-3.3#PBF uniquely balances 80mA output, 3.3V precision regulation, PGOOD signaling, and soft-start programmability - making it the only option among the three qualified for robust, medium-current portable power management with system-level diagnostics.
Availability
LTC1751EMS8-3.3#PBF is available at Aetrix Electronics and suitable for Li-ion backup supplies, smart card readers, PCMCIA local power, and white LED backlighting requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LTC1751EMS8-3.3#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 its high-performance analog and power management portfolio. Linear pioneered precision switching regulators and charge pumps for demanding portable applications.
The LTC1751EMS8-3.3#PBF belongs to Linear's micropower charge pump family designed specifically for battery-powered systems needing regulated, inductorless DC/DC conversion with diagnostic features and extended temperature operation.
FAQ
What is the maximum input voltage for the LTC1751EMS8-3.3#PBF?
The LTC1751EMS8-3.3#PBF supports an absolute maximum input voltage of 6V, but its specified operating range is 2V to 4.4V. Exceeding 4.4V may cause overvoltage stress on internal circuitry and degrade regulation accuracy or reliability. For inputs above 4.4V, consider using an external LDO or clamp circuit before the LTC1751EMS8-3.3#PBF VIN pin.
Does the LTC1751EMS8-3.3#PBF require external feedback resistors?
No, the LTC1751EMS8-3.3#PBF does not require external feedback resistors. It integrates a precision internal resistive divider to set the 3.3V output voltage. The FB pin is absent on this variant - only present on the adjustable LTC1751 version. This simplifies layout and improves regulation stability across temperature and load.
Can the LTC1751EMS8-3.3#PBF drive a 100mA load?
No, the LTC1751EMS8-3.3#PBF is rated for up to 80mA output current when VIN ≥ 2.5V. Attempting to draw 100mA will cause output voltage droop beyond ±4% regulation and may trigger thermal shutdown under sustained load. For 100mA applications, the LTC1751EMS8-5 (5V version) or alternative regulators like the LTC3526L should be evaluated.
How does the PGOOD pin function on the LTC1751EMS8-3.3#PBF?
The PGOOD pin on the LTC1751EMS8-3.3#PBF is an open-drain output that transitions from low to high-impedance once VOUT reaches within ±4.5% of 3.3V during startup. If VOUT falls below –7% of nominal (3.07V), PGOOD pulls low to signal undervoltage fault. An external pull-up resistor (e.g., 100kΩ to VOUT) is required for proper logic-level operation.
What capacitor values are recommended for the LTC1751EMS8-3.3#PBF?
For the LTC1751EMS8-3.3#PBF: use a 1µF X7R ceramic flying capacitor (CFLY) between C+ and C–; 10µF low-ESR ceramic input (CIN) and output (COUT) capacitors; and optional 1nF–10nF soft-start capacitor (CSS) on SS pin. Murata GRM39X5R105K6.3AJ (CFLY) and GRM40X5R106K6.3AJ (CIN/COUT) are validated choices per Linear's design notes.
LTC1751EMS8-3.3#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):
- 2.5V
- 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#PBF FAQ
1.How can I place an order for LTC1751EMS8-3.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1751EMS8-3.3#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 LTC1751EMS8-3.3#PBF reliable?
The price and inventory of LTC1751EMS8-3.3#PBF 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#PBF is usually 5 days.
3.What payment methods are accepted for LTC1751EMS8-3.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1751EMS8-3.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1751EMS8-3.3#PBF?
LTC1751EMS8-3.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1751EMS8-3.3#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 LTC1751EMS8-3.3#PBF?
For technical support, including LTC1751EMS8-3.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1751EMS8-3.3#PBF requirements.
6.How does Aetrix verify that LTC1751EMS8-3.3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1751EMS8-3.3#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 LTC1751EMS8-3.3#PBF meets industry standards.
7.What is the process for return or replacement of LTC1751EMS8-3.3#PBF?
All LTC1751EMS8-3.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1751EMS8-3.3#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 LTC1751EMS8-3.3#PBF part is unused and in its original packaging.
Return procedure for LTC1751EMS8-3.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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