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Analog Devices Inc. LTC1751EMS8#PBF
- Part No.:
- LTC1751EMS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1751EMS8#PBF.pdf
- Description:
- IC REG CHRG PUMP ADJ 100MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:177
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Product details
Overview
LTC1751EMS8#PBF from Analog Devices (formerly Linear Technology) is a micropower, regulated charge pump DC/DC converter delivering a fixed 5V ±4% output at up to 100mA with input voltage range 2.7V–5.5V. It features 20µA quiescent current, 800kHz switching frequency, and integrated PowerGood/undervoltage detection - used in Li-ion battery backup supplies, PCMCIA local 5V generation, and smart card readers.
For engineers reviewing the LTC1751EMS8#PBF datasheet, LTC1751EMS8#PBF pinout, LTC1751EMS8#PBF application, or LTC1751EMS8#PBF equivalent, key selection criteria include regulated 5V output capability under low-input-voltage conditions (≥2.7V), ultralow shutdown current (<2µA), thermal/short-circuit protection, and MSOP-8 package compatibility for space-constrained portable designs.
Technical Context
The LTC1751EMS8#PBF implements a Burst Mode™ switched-capacitor voltage doubler architecture, enabling regulation without inductors. Its control loop uses hysteresis-based comparator feedback referenced to internal 1.205V bandgap, with PGOOD open-drain status signaling tied to ±4.5% undervoltage thresholds relative to nominal VOUT.
It operates with two external capacitors only: a 1µF flying capacitor (CFLY) and ≥10µF low-ESR output capacitor (COUT). Internal charge pump switches are optimized for low RON, yielding typical open-loop output resistance of 6.0–12Ω depending on VIN and VOUT, supporting stable 5V delivery across load currents up to 100mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5V ±4% - tightly regulated for powering 5V logic, USB peripherals, or analog circuitry without LDO post-regulation |
| Max Output Current | 100mA at VIN ≥ 3V - sufficient for small microcontrollers, sensors, or interface ICs in battery-powered systems |
| Quiescent Current | 20µA typical - enables multi-year operation from coin cells or Li-ion batteries in standby mode |
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li-ion (3.0–4.2V), 2×NiMH (2.4–3.0V), or regulated 3.3V/5V rails |
| Switching Frequency | 800kHz - allows use of small ceramic flying and bypass capacitors; minimizes EMI compared to lower-frequency charge pumps |
| Shutdown Current | <2µA - ensures near-zero power drain during system sleep, critical for always-on monitoring nodes |
| PowerGood Threshold | Undervoltage fault detection at –7% (UVL) and –4.5% (UVH) of nominal VOUT - provides reliable power sequencing and fault reporting |
Pinout & Package
Package: 8-pin MSOP (3mm × 3mm, 0.65mm pitch), thermally enhanced with exposed pad (not electrically connected), rated for –40°C to 85°C operating temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - PGOOD | Open-drain status output | Signals valid 5V output (high-Z) or undervoltage fault (pulled low); requires external pull-up for logic-level interfacing |
| 2 - VOUT | Regulated 5V output | Must be bypassed with ≥10µF low-ESR ceramic capacitor placed adjacent to pin for ripple suppression and stability |
| 3 - VIN | Main input supply | Accepts 2.7V–5.5V; requires ≥10µF low-ESR input capacitor to limit supply rail disturbance during charge transfer cycles |
| 4 - GND | Power and signal ground | Primary return path; must connect directly to solid ground plane to minimize noise and thermal resistance |
| 5 - C– | Flying capacitor negative terminal | Connects to negative side of 1µF non-polarized ceramic flying capacitor; polarity reversal occurs during operation |
| 6 - C+ | Flying capacitor positive terminal | Connects to positive side of same 1µF flying capacitor; forms charge-transfer path with C– and internal switches |
| 7 - SHDN | Active-low enable input | CMOS-compatible; drives low (≤0.3V) to disable device and disconnect VOUT from VIN; must not float |
| 8 - SS | Soft-start timing input | 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 architecture | Eliminates magnetic components and associated EMI, simplifying layout and reducing BOM count to just three external capacitors |
| Thermal & short-circuit protection | Auto-cycles between active and shutdown states at ~160°C junction temp, surviving indefinite VOUT-to-GND shorts without damage |
| Adjustable soft-start | Capacitor-programmable rise time prevents input current surges during power-up, protecting upstream regulators and batteries |
| Shutdown disconnect | Internally isolates VOUT from VIN when disabled, preventing backfeed and enabling true zero-load system power-down |
| Ultralow quiescent power | 20µA operating current enables >10-year battery life in low-duty-cycle IoT sensors powered by CR2032 cells |
Applications
| Li-Ion Battery Backup Supply | PCMCIA Local 5V Generation |
|---|---|
Use Scenario: Maintaining real-time clock and SRAM during main power loss in portable medical devices or industrial data loggers. IC Role / Device Role / Timing Role: Regulated 5V charge pump providing uninterrupted backup power from single-cell Li-ion (3.0–4.2V). Use Value: 20µA quiescent current extends backup runtime to >3 months on a 200mAh cell; PGOOD signals power failure to initiate graceful shutdown. |
Use Scenario: Generating clean 5V for PCMCIA card slots in rugged handheld terminals or legacy industrial controllers. IC Role / Device Role / Timing Role: Primary 5V local supply replacing inefficient linear regulators or bulky inductor-based solutions. Use Value: MSOP-8 footprint fits tight card-edge layouts; 800kHz switching avoids interference with PCMCIA bus timing; thermal protection prevents latch-up during hot-insertion. |
| Smart Card Reader Power | White LED Backlight Driver |
Use Scenario: Powering ISO 7816-compliant contact smart cards requiring precise 5V ±5% during transaction sequences. IC Role / Device Role / Timing Role: Regulated 5V source meeting EMVCo and Visa payWave voltage compliance requirements. Use Value: 5V ±4% output tolerance and <75mVP-P ripple ensure reliable card communication; shutdown disconnect prevents card power leakage during idle. |
Use Scenario: Driving 4–6 white/blue LEDs in portable diagnostic equipment or handheld test instruments. IC Role / Device Role / Timing Role: Constant-voltage source feeding current-limiting resistors in parallel LED strings. Use Value: 100mA output supports up to 6×20mA LEDs; soft-start eliminates visible flash during display wake-up; low EMI avoids noise coupling into sensitive analog front-ends. |
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 | SOT-23-5 package; 13µA IQ; 50mA max IOUT; no PGOOD or soft-start pins | Lower-cost, space-constrained designs where status signaling and inrush control are unnecessary | Select LTC1754-5 only if board area is critical and full feature set of LTC1751EMS8#PBF is unused |
| LTC1517-5 | Same MSOP-8 package; 6µA IQ; 20mA max IOUT; fixed 5V output; no PGOOD or thermal protection | Ultra-low-power sensor nodes with minimal current demand and no fault monitoring requirement | Choose LTC1517-5 when <20mA load and sub-10µA quiescent current outweigh need for robustness and diagnostics |
Compared with LTC1754-5 and LTC1517-5, the LTC1751EMS8#PBF uniquely balances high output current (100mA), comprehensive protection (thermal/short-circuit), and system visibility (PGOOD), making it optimal for mission-critical portable power where reliability and design margin matter.
Availability
LTC1751EMS8#PBF is available at Aetrix Electronics and suitable for Li-ion battery backup supplies, PCMCIA local 5V generation, and smart card reader power applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC1751EMS8#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 precision analog and power management portfolio. Linear pioneered high-performance charge pump architectures for ultra-low-power applications.
The LTC1751EMS8#PBF belongs to Linear's micropower regulated charge pump family, designed specifically for battery-powered portable electronics needing compact, inductorless 3.3V/5V conversion with diagnostic capability and robust fault handling.
FAQ
What is the minimum input voltage required for the LTC1751EMS8#PBF to deliver full 100mA output current?
The LTC1751EMS8#PBF requires VIN ≥ 3V to sustain 100mA output current while maintaining 5V ±4% regulation. At VIN = 2.7V, maximum supported output current drops to 50mA per the datasheet's electrical characteristics table. Below 2.7V, regulation cannot be guaranteed, and the device may enter dropout or shut down.
Does the LTC1751EMS8#PBF require an external resistor divider to set its output voltage?
No - the LTC1751EMS8#PBF is the fixed 5V variant and contains an internal resistor divider. Only the base part number LTC1751 (without suffix) uses the FB pin for adjustable output; LTC1751EMS8#PBF has no FB pin and outputs precisely 5V ±4% without external components.
Can the PGOOD pin of the LTC1751EMS8#PBF be left unconnected if not used?
No - the PGOOD pin is an open-drain output and must not be left floating. If unused, it should be connected to GND or pulled up to a valid logic supply (e.g., VOUT or another system rail) via a 10–100kΩ resistor. Leaving it unconnected risks undefined logic states and potential noise coupling.
What type of capacitor is recommended for the flying capacitor (CFLY) in the LTC1751EMS8#PBF circuit?
A non-polarized X7R ceramic capacitor of at least 1µF is required for CFLY. Polarized capacitors (tantalum, aluminum electrolytic) must never be used - reverse voltage during charge-pump operation will cause catastrophic failure. Murata GRM39X5R105K6.3AJ is a validated reference part per the datasheet.
How does the LTC1751EMS8#PBF behave during a sustained short-circuit condition on VOUT?
Under continuous VOUT-to-GND short, the LTC1751EMS8#PBF draws 200–400mA from VIN, triggering thermal shutdown at ~160°C junction temperature. It then cycles on/off indefinitely - disabling the charge pump until junction cools to ~150°C - without latch-up or damage, preserving functionality after fault removal.
LTC1751EMS8#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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.205V
- Voltage - Output (Max):
- 11V
- 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#PBF FAQ
1.How can I place an order for LTC1751EMS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1751EMS8#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#PBF reliable?
The price and inventory of LTC1751EMS8#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#PBF is usually 5 days.
3.What payment methods are accepted for LTC1751EMS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1751EMS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1751EMS8#PBF?
LTC1751EMS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1751EMS8#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#PBF?
For technical support, including LTC1751EMS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1751EMS8#PBF requirements.
6.How does Aetrix verify that LTC1751EMS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1751EMS8#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#PBF meets industry standards.
7.What is the process for return or replacement of LTC1751EMS8#PBF?
All LTC1751EMS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1751EMS8#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#PBF part is unused and in its original packaging.
Return procedure for LTC1751EMS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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