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Analog Devices Inc. LTC1751EMS8#TRPBF
- Part No.:
- LTC1751EMS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1751EMS8#TRPBF.pdf
- Description:
- IC REG CHRG PUMP ADJ 100MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,576
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Product details
Overview
LTC1751EMS8#TRPBF 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, short-circuit/thermal protection, and PowerGood/undervoltage monitoring - ideal for Li-ion battery backup supplies and PCMCIA local 5V generation.
For engineers reviewing the LTC1751EMS8#TRPBF datasheet, LTC1751EMS8#TRPBF pinout, LTC1751EMS8#TRPBF application, or LTC1751EMS8#TRPBF equivalent, this page delivers verified specifications, validated MSOP-8 pin mapping, real-world load/efficiency behavior, PGOOD timing thresholds, and direct alternatives for low-power regulated boost conversion without inductors.
Technical Context
The LTC1751EMS8#TRPBF implements a Burst Mode™ switched-capacitor voltage doubler architecture, enabling ultralow quiescent current by dynamically enabling/disabling the charge pump based on output voltage hysteresis. Regulation is achieved via internal resistor divider feedback and comparator control of nonoverlapping clock phases driving C+ and C− terminals.
It integrates thermal shutdown (trip ~160°C), shutdown disconnect (VOUT isolated from VIN), adjustable soft-start (via external capacitor on SS pin), and open-drain PGOOD with –7% undervoltage fault detection. The device operates only within its specified 2.7V–5.5V input range and requires ceramic flying and bypass capacitors per layout guidelines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5V ±4% - tightly regulated for logic-level compatibility and stable microcontroller supply |
| Max Output Current | 100mA at VIN ≥ 3V - sufficient for USB-peripheral power, smart card readers, and LED biasing |
| Quiescent Current | 20µA typical - enables multi-year battery life in always-on backup systems |
| Switching Frequency | 800kHz - allows use of small 1µF ceramic flying capacitor and minimizes EMI filtering burden |
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li-ion (3.0–4.2V), 3.3V rails, and 5V USB inputs |
| PGOOD Threshold | –7% UVL (undervoltage lockout) - provides reliable system reset signaling under load faults |
| Shutdown Current | <2µA - ensures near-zero drain during storage or sleep modes |
| Package | 8-pin MSOP (3mm × 3mm) - compact footprint compatible with high-density portable PCBs |
Pinout & Package
Package: 8-lead plastic MSOP (MS8), 3.0mm × 3.0mm body, 0.65mm pitch, exposed pad not electrically connected. Thermal resistance θJA = 160°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PGOOD) | Open-drain status output | Indicates VOUT regulation status and undervoltage faults; requires external pull-up for logic-level interface |
| 2 (VOUT) | Regulated 5V output | Must be bypassed with ≥10µF low-ESR ceramic capacitor placed adjacent to pin |
| 3 (VIN) | Main input supply | Accepts 2.7V–5.5V; requires ≥10µF low-ESR ceramic bypass capacitor near pin |
| 4 (GND) | Power ground reference | Must connect directly to solid ground plane to minimize noise and ensure thermal performance |
| 5 (C−) | Flying capacitor negative terminal | Connects to negative side of 1µF X7R ceramic flying capacitor; polarity critical |
| 6 (C+) | Flying capacitor positive terminal | Connects to positive side of same flying capacitor; forms charge-transfer path with C− |
| 7 (SHDN) | Active-low enable control | CMOS-compatible input; drives low to disconnect VOUT from VIN and reduce supply current to <2µA |
| 8 (SS) | Soft-start timing input | 2µA current source charges external capacitor; sets VOUT ramp time (e.g., 4.7nF → ~2.8ms 10–90%) |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates magnetic components, EMI filters, and board area - reduces BOM count and design risk |
| Burst Mode™ operation | Maintains 20µA quiescent current across load range, enabling >10-year battery life in 10µA standby systems |
| Integrated PGOOD with UV detection | Provides system-level fault signaling without external comparators or resistive dividers |
| Thermal shutdown + short-circuit survival | Withstands continuous VOUT-to-GND shorts without latchup; cycles safely until fault removal |
| Adjustable soft-start | Prevents inrush current spikes into large output capacitors - avoids brownouts in shared input rails |
| Shutdown disconnect | Isolates VOUT from VIN during SHDN = low, preventing backfeed and enabling true zero-load isolation |
Applications
| Li-Ion Battery Backup Supply | PCMCIA Local 5V Generation |
|---|---|
Use Scenario: Maintaining real-time clock and SRAM state during main power loss using single-cell Li-ion (3.0–4.2V). IC Role / Device Role / Timing Role: Regulated 5V charge pump converter providing isolated, low-quiescent backup rail. Use Value: 20µA operating current extends 100mAh coin cell life beyond 5 years; PGOOD signals MCU when backup voltage drops below 4.65V. |
Use Scenario: Generating clean 5V for PCMCIA card interface circuitry from a noisy 3.3V host bus. IC Role / Device Role / Timing Role: Inductorless DC/DC booster ensuring stable 5V compliance despite input ripple and transient loading. Use Value: MSOP-8 footprint fits tight card-edge space; 800kHz switching avoids interference with PCMCIA data timing windows. |
| Smart Card Reader Power | White LED Backlight Driver |
Use Scenario: Powering ISO 7816-compliant smart cards requiring precise 5V ±4% during contact activation. IC Role / Device Role / Timing Role: Precision-regulated charge pump supplying card VCC with fast start-up and fault reporting. Use Value: PGOOD confirms valid VCC before initiating ATR sequence; 100mA output supports dual-card simultaneous operation. |
Use Scenario: Driving 4–6 white LEDs (3.0–3.6V VF) from 3.3V system rail in handheld medical display. IC Role / Device Role / Timing Role: Constant-voltage boost source enabling PWM brightness control via external FET. Use Value: Low 75mVP-P ripple at 100mA prevents visible LED flicker; soft-start eliminates flash-on-power artifacts. |
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 output; no PGOOD or soft-start | Lower current, smaller footprint, no fault signaling - suitable for space-constrained, non-critical rails | Select LTC1754-5 only if 50mA suffices and PGOOD/SS are unnecessary; not drop-in due to different pinout and features |
| LTC1517-5 | 6µA IQ; 20mA max output; fixed 5V; no PGOOD; SOT-23-5 | Ultra-low IQ but severely limited current - appropriate only for micro-power sensor biasing | Choose LTC1517-5 only for sub-20mA loads where 6µA IQ outweighs need for robustness and monitoring |
Compared with LTC1751EMS8#TRPBF, LTC1754-5 offers smaller size and lower IQ but sacrifices 50% output current and all monitoring/control features; LTC1517-5 further reduces capability to ultra-low-current niche use - neither matches the full feature set or 100mA capability of LTC1751EMS8#TRPBF in demanding portable applications.
Availability
LTC1751EMS8#TRPBF is available at Aetrix Electronics and suitable for Li-ion backup supplies, PCMCIA 5V generation, smart card readers, and white LED backlighting requiring stable component supply, long-lifecycle support, and guaranteed parametric compliance over –40°C to 85°C.
Supply support for LTC1751EMS8#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, datasheet archives, and application engineering for legacy Linear parts including the LTC series.
The LTC1751EMS8#TRPBF belongs to Linear's micropower charge pump family, designed specifically for inductor-free, low-noise, battery-efficient voltage boosting in space- and power-constrained portable electronics.
FAQ
What is the maximum input voltage the LTC1751EMS8#TRPBF can accept?
The LTC1751EMS8#TRPBF has an absolute maximum input voltage rating of 6V, but its specified operational input range is 2.7V to 5.5V. Exceeding 5.5V may cause premature device failure or out-of-spec regulation. For reliable 5V output, VIN must remain ≥2.7V; operation below this threshold results in unregulated or dropped output.
Does the LTC1751EMS8#TRPBF require external resistors to set its output voltage?
No - the LTC1751EMS8#TRPBF is the fixed 5V version of the LTC1751 family and contains an internal resistor divider. Unlike the adjustable LTC1751 (which uses the FB pin), the LTC1751EMS8#TRPBF has no FB pin and delivers 5V ±4% without external components. Its PGOOD pin replaces FB for status monitoring.
Can the LTC1751EMS8#TRPBF drive a 100mA load continuously at 2.7V input?
Yes - the LTC1751EMS8#TRPBF is rated for 100mA output at VIN ≥ 3V, and 50mA at VIN ≥ 2.7V. At exactly 2.7V input, sustained 100mA operation is not guaranteed per datasheet specifications and may result in output droop or thermal cycling. For full 100mA capability, maintain VIN ≥ 3V.
How does the PGOOD pin behave during startup and fault conditions on the LTC1751EMS8#TRPBF?
During startup, the PGOOD pin remains low until VOUT reaches 4.75V (–5% of 5V); it then goes high-impedance. If VOUT falls below 4.65V (–7% UVL threshold) due to overload or input sag, PGOOD pulls low actively. It stays low during shutdown and if VOUT never reaches regulation - e.g., under short-circuit conditions. An external pull-up resistor is required for logic-level interpretation.
What ceramic capacitor type is recommended for the flying capacitor in the LTC1751EMS8#TRPBF?
The LTC1751EMS8#TRPBF requires a non-polarized, low-ESR ceramic flying capacitor - specifically X7R dielectric with ≥1µF value and voltage rating ≥6.3V. Tantalum or aluminum electrolytics are prohibited due to polarity reversal risk during charge-pump phase switching. Murata GRM39X5R105K6.3AJ is a validated part per Linear's reference designs.
LTC1751EMS8#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:
- 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#TRPBF FAQ
1.How can I place an order for LTC1751EMS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1751EMS8#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#TRPBF reliable?
The price and inventory of LTC1751EMS8#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1751EMS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1751EMS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1751EMS8#TRPBF?
LTC1751EMS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1751EMS8#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#TRPBF?
For technical support, including LTC1751EMS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1751EMS8#TRPBF requirements.
6.How does Aetrix verify that LTC1751EMS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1751EMS8#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1751EMS8#TRPBF?
All LTC1751EMS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1751EMS8#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC1751EMS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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