My Inquiry
My Account
Analog Devices Inc. LTC1751EMS8-5#PBF
- Part No.:
- LTC1751EMS8-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1751EMS8-5#PBF.pdf
- Description:
- IC REG CHARG PUMP 5V 100MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:207
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC1751EMS8-5#PBF 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. It is used in Li-ion battery backup supplies and PCMCIA local 5V generation where inductor-free, low-quiescent-power conversion is critical.
For engineers reviewing the LTC1751EMS8-5#PBF datasheet, LTC1751EMS8-5#PBF pinout, LTC1751EMS8-5#PBF application, or LTC1751EMS8-5#PBF equivalent, key selection criteria include regulated 5V ±4% output accuracy, thermal/short-circuit protection, soft-start programmability via SS pin, shutdown disconnect functionality, and compatibility with ceramic flying capacitors (≥1µF).
Technical Context
The LTC1751EMS8-5#PBF implements a Burst Mode™ switched-capacitor voltage doubler architecture to achieve ultralow quiescent current. Regulation is maintained via hysteresis-based comparator control of the charge pump, with PGOOD monitoring output validity against –7% undervoltage threshold.
It operates across 2.7V–5.5V input, delivers regulated 5V output with ±4% tolerance at ≤100mA load, and uses external CFLY (1µF ceramic) and bypass capacitors to define charge pump strength, ripple, and start-up behavior. Thermal shutdown activates at ~160°C and cycles until fault removal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5V ±4% - Ensures stable logic-level supply for 5V microcontrollers or peripherals without external feedback. |
| Max Output Current | 100mA at VIN ≥ 3V - Supports moderate-power loads like USB peripheral power rails or small FPGA I/O banks. |
| Quiescent Current | 20µA typical - Enables multi-year battery life in always-on backup or smart card applications. |
| Switching Frequency | 800kHz - Allows use of compact 1µF ceramic flying capacitor and minimizes EMI filtering burden. |
| Input Voltage Range | 2.7V to 5.5V - Compatible with single-cell Li-ion (3.0–4.2V), 3.3V system rails, and 5V USB sources. |
| PGOOD Threshold | Undervoltage detection at –7% VOUT (4.65V) - Provides reliable system reset signaling during brownout. |
| Shutdown Current | <2µA - Isolates load from VIN during sleep mode, eliminating standby leakage paths. |
Pinout & Package
Package: 8-pin MSOP (3mm × 3mm, 0.65mm pitch), thermally enhanced with exposed pad (not electrically connected). Pin 4 (GND) must be tied to a solid ground plane for thermal and regulation stability.
| 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 interfacing. |
| 2 - VOUT | Regulated 5V output | Must be bypassed with ≥10µF low-ESR ceramic capacitor placed adjacent to pin for ripple suppression. |
| 3 - VIN | Input supply (2.7–5.5V) | Requires ≥10µF low-ESR ceramic bypass; high-frequency transients demand short PCB trace to GND. |
| 4 - GND | Power and signal reference | Primary thermal path; must connect to internal/external ground plane for thermal shutdown margin and noise immunity. |
| 5 - C– | Flying capacitor negative terminal | Connects to negative side of 1µF X7R ceramic flying capacitor; polarity reversal occurs-tantalum prohibited. |
| 6 - C+ | Flying capacitor positive terminal | Connects to positive side of same flying capacitor; forms charge-transfer path with C– during clock phases. |
| 7 - SHDN | Active-low enable input | CMOS-compatible; drives low to disable device and disconnect VOUT from VIN; must not float. |
| 8 - SS | Soft-start timing input | 2µA current source ramps voltage; 4.7nF capacitor yields ~2.8ms VOUT rise time, limiting inrush current. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates magnetic components and EMI concerns-ideal for space-constrained portable designs. |
| Thermal + short-circuit protection | Self-cycling shutdown at ~160°C prevents damage during sustained overload or output short. |
| Programmable soft-start | Capacitor on SS pin controls VOUT ramp rate, preventing input supply sag or LDO dropout in shared-rail systems. |
| Load disconnect in shutdown | VIN-to-VOUT isolation ensures zero hold-up current-critical for battery-backed real-time clocks. |
| Low-noise regulation | 75mVP-P ripple at 50mA load with 10µF COUT enables direct powering of analog sensors or RF ICs. |
Applications
| Li-Ion Battery Backup Supply | PCMCIA Local 5V Generation |
|---|---|
|
Use Scenario: Maintaining RTC or 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 providing isolated, low-quiescent backup rail with PGOOD confirmation. Use Value: 20µA operating current extends battery life beyond 5 years; shutdown disconnect prevents self-discharge. |
Use Scenario: Generating clean 5V for PCMCIA card interface logic when host supplies only 3.3V or variable bus voltage. IC Role / Device Role / Timing Role: Inductorless DC/DC converter delivering stable 5V at up to 100mA with minimal board area. Use Value: MSOP-8 footprint and ceramic-only BOM reduce layout complexity versus buck-boost solutions. |
| Smart Card Reader Power | White LED Backlight Driver |
|
Use Scenario: Powering ISO 7816-compliant smart cards requiring precise 5V ±4% during active communication. IC Role / Device Role / Timing Role: Regulated charge pump ensuring voltage compliance across full temperature range (–40°C to 85°C). Use Value: PGOOD confirms regulation before initiating card reset sequence; thermal protection avoids card lockup under fault. |
Use Scenario: Driving 4–6 white LEDs in series from 3.3V system rail in handheld medical or industrial displays. IC Role / Device Role / Timing Role: Constant-voltage source enabling current-mode LED driver stage with PWM brightness control. Use Value: 800kHz operation allows small 1µF flying capacitor; soft-start prevents LED flash during display wake-up. |
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 SS pins. | Limited to lower-current, space-constrained apps without status signaling or controlled start-up. | Select LTC1754-5 only if board area is critical and PGOOD/soft-start are unnecessary. |
| LTC1517-5 | 6µA IQ; 20mA max output; fixed 5V; no PGOOD; MSOP-8 but different pinout (no SS/PGOOD). | Suitable only for ultra-low-power, low-current bias rails-not for dynamic loads or system monitoring. | Choose LTC1517-5 only for sub-20mA standby rails where efficiency dominates over functionality. |
Compared with LTC1754-5 and LTC1517-5, the LTC1751EMS8-5#PBF uniquely combines 100mA capability, PGOOD fault reporting, and programmable soft-start in MSOP-8-making it the only option for robust, medium-current, battery-backed 5V generation requiring system visibility and controlled turn-on.
Availability
LTC1751EMS8-5#PBF 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 across industrial temperature ranges (–40°C to 85°C).
Supply support for LTC1751EMS8-5#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-efficiency, low-noise DC/DC solutions for portable and battery-critical systems.
The LTC1751EMS8-5#PBF belongs to Linear's micropower charge pump family, designed specifically for inductor-free, low-quiescent-current 5V regulation in space- and energy-constrained applications such as smart cards, backup rails, and portable peripherals.
FAQ
What is the minimum input voltage required for the LTC1751EMS8-5#PBF to deliver full 100mA output?
The LTC1751EMS8-5#PBF requires VIN ≥ 3V to sustain 100mA output current while maintaining 5V ±4% regulation. At VIN = 2.7V, maximum output drops to 50mA per datasheet specifications. Below 2.7V, regulation fails and output collapses-this hard limit is defined by the charge pump's voltage-doubling topology and internal switch RDS(on).
Can the LTC1751EMS8-5#PBF drive a 10µF output capacitor without violating startup requirements?
Yes-the LTC1751EMS8-5#PBF is characterized with 10µF COUT and supports it directly. However, larger COUT increases minimum turn-on time and inrush current; soft-start via the SS pin (e.g., 4.7nF) mitigates this. The datasheet confirms stable operation with 10µF low-ESR ceramic capacitors at both VIN and VOUT.
Does the PGOOD pin on the LTC1751EMS8-5#PBF provide both power-good indication and undervoltage fault detection?
Yes-the PGOOD pin on the LTC1751EMS8-5#PBF performs dual functions: it transitions to high-impedance once VOUT reaches 5V ±4%, and pulls low if VOUT falls below 4.65V (–7% of nominal), indicating an undervoltage fault. This behavior is preprogrammed and requires no external components beyond a pull-up resistor.
Is a flying capacitor required for the LTC1751EMS8-5#PBF, and what type must it be?
Yes-a flying capacitor is mandatory. It must be a non-polarized, low-ESR ceramic capacitor (X7R dielectric recommended), minimum 1µF. Polarized types (tantalum, aluminum) are strictly prohibited due to voltage reversal during charge-pump operation, which would cause catastrophic failure.
How does thermal shutdown behave on the LTC1751EMS8-5#PBF during continuous short-circuit conditions?
Under continuous VOUT-to-GND short, the LTC1751EMS8-5#PBF draws 200–400mA from VIN, heating the junction until thermal shutdown triggers at ~160°C. It then cycles on/off indefinitely-disabling the charge pump until junction cools to ~150°C-without latch-up or damage, preserving reliability during field faults.
LTC1751EMS8-5#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):
- 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#PBF FAQ
1.How can I place an order for LTC1751EMS8-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1751EMS8-5#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 LTC1751EMS8-5#PBF reliable?
The price and inventory of LTC1751EMS8-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1751EMS8-5#PBF is usually 5 days.
3.What payment methods are accepted for LTC1751EMS8-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1751EMS8-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1751EMS8-5#PBF?
LTC1751EMS8-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1751EMS8-5#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 LTC1751EMS8-5#PBF?
For technical support, including LTC1751EMS8-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1751EMS8-5#PBF requirements.
6.How does Aetrix verify that LTC1751EMS8-5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1751EMS8-5#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 LTC1751EMS8-5#PBF meets industry standards.
7.What is the process for return or replacement of LTC1751EMS8-5#PBF?
All LTC1751EMS8-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1751EMS8-5#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 LTC1751EMS8-5#PBF part is unused and in its original packaging.
Return procedure for LTC1751EMS8-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC1751EMS8-5#PBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
