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Analog Devices Inc. LTC1751EMS8-5#TRPBF
- Part No.:
- LTC1751EMS8-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1751EMS8-5#TRPBF.pdf
- Description:
- IC REG CHARG PUMP 5V 100MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,245
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Product details
Overview
LTC1751EMS8-5#TRPBF from Analog Devices (formerly Linear Technology) is a micropower, regulated 5V charge pump DC/DC converter in an 8-pin MSOP package. It delivers up to 100mA output current with VIN ≥ 3V, features 20µA quiescent current, 800kHz switching frequency, and integrated PowerGood/undervoltage detection - ideal for Li-ion battery backup supplies and PCMCIA local 5V generation.
For engineers reviewing the LTC1751EMS8-5#TRPBF datasheet, LTC1751EMS8-5#TRPBF pinout, LTC1751EMS8-5#TRPBF application, or LTC1751EMS8-5#TRPBF equivalent, key selection criteria include regulated 5V ±4% output stability across 2.7V–5.5V input, thermal/short-circuit protection, shutdown disconnect functionality, and soft-start programmability via external capacitor.
Technical Context
The LTC1751EMS8-5#TRPBF implements a Burst Mode™ switched-capacitor voltage doubler architecture to achieve ultralow quiescent current. Regulation is enforced by a hysteresis-based comparator monitoring VOUT through an internal resistive divider, enabling/disabling the charge pump based on output deviation from 5V ±4%.
It integrates PGOOD open-drain status signaling with –7% undervoltage fault threshold, active-low CMOS-compatible SHDN with 0.3V/1.5V logic thresholds, and SS pin-controlled soft-start using a 2µA ramp current. The device operates without inductors and supports indefinite short-circuit survival with automatic thermal cycling at ~160°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5V ±4% (regulated; stable across 3V–5.5V input at ≤100mA) |
| Max Output Current | 100mA (requires VIN ≥ 3V; derates to 50mA at VIN = 2.7V) |
| Quiescent Current | 20µA typical (enables >1-year battery life in low-duty-cycle IoT sensors) |
| Input Voltage Range | 2.7V to 5.5V (supports single-cell Li-ion, 3.3V rails, and USB-powered systems) |
| Switching Frequency | 800kHz (enables compact 1µF flying capacitor and low-ESR ceramic output filtering) |
| Shutdown Current | <2µA (disconnects load from VIN; critical for zero-power standby modes) |
| PowerGood Threshold | Undervoltage fault detection at –7% of nominal VOUT (enables system reset or brownout warning) |
Pinout & Package
Package: 8-pin MSOP (3mm × 3mm, 0.65mm pitch), RoHS-compliant, thermally enhanced with exposed pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - PGOOD | Open-drain output status indicator | Signals VOUT regulation achievement (high-Z) or undervoltage fault (pulled low); requires external pull-up |
| 2 - VOUT | Regulated 5V output | Must be bypassed with ≥10µF low-ESR ceramic capacitor placed adjacent to pin |
| 3 - VIN | Main input supply (2.7V–5.5V) | Bypass with ≥10µF low-ESR ceramic; high-impedance during shutdown |
| 4 - GND | Power and signal reference ground | Connect directly to solid ground plane; critical for thermal performance and ripple suppression |
| 5 - C– | Flying capacitor negative terminal | Connects to negative side of 1µF X7R ceramic flying capacitor; polarity-sensitive |
| 6 - C+ | Flying capacitor positive terminal | Connects to positive side of 1µF X7R ceramic flying capacitor; forms charge-transfer path |
| 7 - SHDN | Active-low enable/disable control | CMOS input; drives low to disable (VIL ≤ 0.3V); must not float |
| 8 - SS | Soft-start timing control | 2µA current source ramps voltage; 4.7nF yields ~2.8ms 10–90% VOUT rise time |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates EMI-prone magnetics and layout sensitivity; enables ultra-thin PCB designs |
| Integrated thermal/short-circuit protection | Auto-cycles between enabled/disabled states during overload without latch-up or damage |
| Programmable soft-start | Prevents inrush current spikes into large output capacitors; avoids input rail droop in shared power domains |
| Shutdown disconnect | Physically isolates VOUT from VIN during shutdown - prevents backfeed and leakage paths |
| PowerGood monitoring | Enables sequenced power-up in multi-rail systems and provides early fault detection before system initialization |
Applications
| Li-Ion Battery Backup Supplies | PCMCIA Local 5V Supplies |
|---|---|
Use Scenario: Maintaining real-time clock and SRAM state during main power loss in portable instrumentation. IC Role / Device Role / Timing Role: Regulated 5V charge pump providing isolated backup power with <2µA shutdown current. Use Value: Extends coin-cell or supercapacitor backup runtime by >3× versus linear regulators due to 20µA quiescent draw. |
Use Scenario: Generating clean 5V for PCMCIA card interface logic when host supplies only 3.3V. IC Role / Device Role / Timing Role: Compact, inductorless 5V rail generator meeting PCMCIA JEIDA spec ripple limits. Use Value: Meets 75mVP-P ripple requirement at 100mA with 10µF ceramic output cap - no ferrite beads needed. |
| Smart Card Readers | White LED Backlighting |
Use Scenario: Powering ISO 7816-compliant smart card interfaces requiring precise 5V ±4% during contact activation. IC Role / Device Role / Timing Role: Regulated 5V source with PGOOD confirmation before card reset assertion. Use Value: Guarantees VOUT within specification before initiating card communication - eliminates protocol timeouts. |
Use Scenario: Driving 4–6 white LEDs in handheld medical devices from single Li-ion cell (3.0–4.2V). IC Role / Device Role / Timing Role: Constant-voltage 5V source feeding external current-mode LED driver IC. Use Value: Enables PWM brightness control without VOUT sag; maintains 5V regulation even at 100mA peak LED current. |
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 SS pins | Lacks power sequencing and fault reporting; suited for space-constrained, low-current apps | Select when board area < 3mm² is critical and system-level monitoring replaces PGOOD |
| LTC1517-5 | 6µA IQ; 20mA max IOUT; same MSOP-8 package; no thermal protection | Lower output capability and no short-circuit survival; limited to light-load sensor nodes | Choose only for ultra-low-power (<10µA avg) applications where 20mA suffices and fault tolerance is secondary |
Compared with LTC1754-5 and LTC1517-5, the LTC1751EMS8-5#TRPBF uniquely combines 100mA output, PGOOD signaling, thermal protection, and soft-start in MSOP-8 - making it the only option for robust, medium-current, battery-backed 5V generation requiring system visibility and reliability.
Availability
LTC1751EMS8-5#TRPBF is available at Aetrix Electronics and suitable for Li-ion battery backup supplies, PCMCIA local 5V generation, and smart card reader power management requiring stable component supply across industrial and medical product lifecycles.
Supply support for LTC1751EMS8-5#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 technical support, manufacturing continuity, and long-term availability for all Linear power products.
The LTC1751EMS8-5#TRPBF belongs to Linear's micropower charge pump family, designed specifically for battery-powered systems needing regulated 5V without inductors - emphasizing ultra-low IQ, fault resilience, and ease of integration.
FAQ
What is the minimum input voltage required for the LTC1751EMS8-5#TRPBF to deliver its full 100mA output?
The LTC1751EMS8-5#TRPBF requires VIN ≥ 3V to sustain 100mA output current while maintaining 5V ±4% regulation. At VIN = 2.7V, maximum output current drops to 50mA per the datasheet's electrical characteristics table. Below 2.7V, regulation is not guaranteed, and output voltage collapses rapidly - confirming the 2.7V absolute minimum input rating is strictly for functional operation, not full-load capability.
Does the LTC1751EMS8-5#TRPBF require external components beyond the flying and bypass capacitors?
Yes - the LTC1751EMS8-5#TRPBF requires three mandatory external components: a 1µF X7R ceramic flying capacitor (CFLY) between C+ and C– pins, plus two ≥10µF low-ESR ceramic capacitors - one at VIN (CIN) and one at VOUT (COUT). An optional soft-start capacitor (CSS) on the SS pin and external pull-up resistor on PGOOD are recommended for full functionality but not required for basic operation.
How does the PGOOD pin behave during startup and fault conditions for the LTC1751EMS8-5#TRPBF?
During startup, the PGOOD pin remains low until VOUT reaches within 4.5% of 5V, then transitions to high-impedance (open-drain high-Z). If VOUT later falls below 4.65V (–7% of 5V), PGOOD pulls low to indicate undervoltage fault. The pin has no internal pull-up and requires an external resistor (e.g., 100kΩ to VOUT) to assert logic-high status - a design feature enabling flexible voltage-level interfacing.
Can the LTC1751EMS8-5#TRPBF be used with input voltages above 5.5V?
No - the absolute maximum VIN rating for the LTC1751EMS8-5#TRPBF is 6V, but continuous operation above 5.5V violates the specified operating range and risks permanent damage. The datasheet explicitly defines 2.7V to 5.5V as the functional input range; exceeding 5.5V degrades reliability and voids parametric guarantees, including output regulation accuracy and thermal shutdown activation thresholds.
Is the LTC1751EMS8-5#TRPBF pin-compatible with other variants in the LTC1751 family?
Yes - the LTC1751EMS8-5#TRPBF shares identical 8-pin MSOP pinout and footprint with LTC1751EMS8-3.3 and the adjustable LTC1751EMS8. Pin functions (PGOOD/FB, VOUT, VIN, GND, C–, C+, SHDN, SS) are consistent across all variants; only internal feedback dividers differ. This allows direct substitution in layouts designed for any LTC1751-MS8 variant, provided external circuitry (e.g., PGOOD pull-up) matches the selected version's capabilities.
LTC1751EMS8-5#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):
- 5V
- 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
LTC1751EMS8-5#TRPBF FAQ
1.How can I place an order for LTC1751EMS8-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1751EMS8-5#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 LTC1751EMS8-5#TRPBF reliable?
The price and inventory of LTC1751EMS8-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1751EMS8-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1751EMS8-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1751EMS8-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1751EMS8-5#TRPBF?
LTC1751EMS8-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1751EMS8-5#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 LTC1751EMS8-5#TRPBF?
For technical support, including LTC1751EMS8-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1751EMS8-5#TRPBF requirements.
6.How does Aetrix verify that LTC1751EMS8-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1751EMS8-5#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 LTC1751EMS8-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1751EMS8-5#TRPBF?
All LTC1751EMS8-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1751EMS8-5#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 LTC1751EMS8-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC1751EMS8-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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