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Analog Devices Inc. LTC1771ES8#TRPBF
- Part No.:
- LTC1771ES8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1771ES8#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,315
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Product details
Overview
LTC1771ES8#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency current-mode step-down DC/DC controller driving an external P-channel MOSFET, featuring 10µA no-load quiescent current, 2.8V–20V input range, and ±2% output voltage accuracy over temperature. It supports up to 5A output current with 100% duty cycle for low-dropout operation and is optimized for battery-powered systems requiring ultra-low standby power.
For engineers reviewing the LTC1771ES8#TRPBF datasheet, LTC1771ES8#TRPBF pinout, LTC1771ES8#TRPBF application, or LTC1771ES8#TRPBF equivalent, key selection considerations include its constant off-time architecture, Burst Mode™ enable/disable via MODE pin, programmable soft-start via RUN/SS, current-sense threshold of 140mV max, and MS8 package thermal resistance of 200°C/W.
Technical Context
The LTC1771ES8#TRPBF implements a constant off-time, current-mode control architecture with a fixed 3.5µs off-time at regulation and up to 70µs during fault conditions. Its error amplifier (EA) drives the ITH pin to modulate peak inductor current, while the internal 1.23V reference compares against VFB to regulate output voltage.
Burst Mode™ operation-enabled by pulling MODE ≥2V-reduces no-load supply current to 9µA typical by entering sleep mode when load falls below ~25% of maximum, clamping ITH at 1V and reducing EA bias current. Disabling Burst Mode via MODE = GND allows continuous operation down to ~1% load with improved noise performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.8V to 20V - supports single- to 4-cell Li-ion, wide industrial input rails, and dropout operation at 100% duty cycle. |
| IQ (No Load) | 10µA - enables multi-year battery life in always-on portable instrumentation and wireless modems. |
| VFB | 1.23V ±2% - sets precise output voltage via external resistor divider; stable over –40°C to 85°C. |
| tOFF | 3.5µs (typical) - determines minimum switching frequency (~286kHz at VOUT/VIN = 0.5); extends to 70µs under short-circuit for safe inductor current decay. |
| Current Sense Threshold | 110–180mV - programs peak switch current via RSENSE; enables accurate current limiting and Burst Mode entry point. |
| Shutdown IQ | 2µA - achieved by pulling RUN/SS ≤0.5V; critical for zero-power system sleep states. |
| Efficiency | >93% at 1A, VIN=10V, VOUT=3.3V - enabled by low gate drive losses, minimal bias current, and optimized current-mode transient response. |
Pinout & Package
Package: 8-Lead MSOP (MS8), 3mm × 3mm, exposed pad, θJA = 200°C/W, rated for –40°C to 85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS (1) | Enable & Soft-Start Control | Pull ≤0.5V for shutdown (IQ = 2µA); connect capacitor for linear soft-start ramp (1µA charge current). |
| ITH (2) | Error Amplifier Output / Current Limit Setpoint | Voltage controls peak inductor current; clamped at ~1V in Burst Mode sleep; 0–3V range. |
| VFB (3) | Feedback Input | Compares against 1.23V internal reference; connects to resistor divider from VOUT to GND. |
| GND (4) | Analog & Power Ground | Common return for feedback, sense, and internal circuitry; requires low-impedance PCB connection. |
| PGATE (5) | P-Channel MOSFET Gate Driver | High-current source/sink (1A peak); swings from GND to VIN; drives external high-side switch. |
| VIN (6) | Main Power Input | Supplies internal bias and PGATE driver; accepts 2.8V–20V; absolute max 20V. |
| SENSE (7) | Current Sense Input | Monitors voltage drop across external RSENSE; sets current limit and Burst Mode threshold. |
| MODE (8) | Burst Mode Enable/Disable | ≥2V enables ultralow-IQ Burst Mode; GND disables for low-noise continuous operation. |
Key Features
| Feature | Design Value |
|---|---|
| Constant Off-Time Current Mode Control | Delivers fast line/load transient response and inherent short-circuit protection without slope compensation. |
| Defeatable Burst Mode™ Operation | Reduces no-load IQ to 9µA typical; disable via MODE pin for EMI-sensitive applications requiring fixed-frequency spectrum. |
| 100% Duty Cycle Capability | Enables dropout operation down to VOUT – VDS(ON) – IOUT·RSENSE, critical for Li-ion end-of-discharge regulation. |
| Programmable Soft-Start | Controlled by external capacitor on RUN/SS; prevents inrush current and enables power sequencing with other rails. |
| Micropower Shutdown | 2µA shutdown current with RUN/SS ≤0.5V - supports deep-sleep modes in IoT edge nodes and portable medical devices. |
Applications
| Cellular Telephones | Portable Instruments |
|---|---|
Use Scenario: Main system power rail for 3G/4G baseband processors and RF transceivers powered by 1–4 cell Li-ion batteries. IC Role / Device Role / Timing Role: Step-down controller regulating 3.3V or 2.8V from variable battery voltage (4.2V–2.8V), maintaining regulation through full discharge. Use Value: 10µA quiescent current extends standby time beyond 30 days; Burst Mode maintains >85% efficiency at 100µA load. |
Use Scenario: Power management in handheld multimeters, gas detectors, and portable oscilloscopes with dual battery chemistries. IC Role / Device Role / Timing Role: Primary DC/DC controller generating stable analog and digital supplies from alkaline or Li-ion sources. Use Value: ±2% VFB accuracy ensures precision ADC reference stability; 100% duty cycle avoids brownout during low-battery operation. |
| Battery Chargers | Wireless Modems |
Use Scenario: Adjustable CC/CV charging stage for single-cell Li-ion packs in portable chargers and power banks. IC Role / Device Role / Timing Role: Constant-current controller using SENSE pin feedback to regulate charge current; VFB setpoint defines termination voltage. Use Value: Programmable current sense threshold (110–180mV) enables accurate ±3% charge current setting; low IQ minimizes self-discharge during storage. |
Use Scenario: System power for LTE/Wi-Fi modules in asset trackers and smart meters operating on primary lithium batteries. IC Role / Device Role / Timing Role: High-efficiency buck controller supplying 3.3V to modem IC and RF front-end, cycling between active and deep-sleep states. Use Value: 2µA shutdown current enables 10+ year battery life; Burst Mode maintains >90% efficiency at 500µA average load during periodic wake-ups. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3502AEDD#TRPBF | Fixed 3.3V output, integrated 1.5A switch, 2.5V–20V input, 2.5µA shutdown IQ; no external MOSFET support. | Suitable for space-constrained designs where 3.3V fixed output suffices and 1.5A max load is acceptable. | Select when board area and BOM count are prioritized over adjustable VOUT and >3A capability. |
| TPS54202DDCR | Integrated 2A FET, 4.5V–28V input, 100µA no-load IQ, adjustable VOUT from 0.6V, no Burst Mode. | Better suited for higher-input industrial rails; lacks ultralow-IQ for long-life battery systems. | Choose for 12V/24V input systems needing moderate efficiency and simpler layout, not multi-year battery life. |
Compared with LT3502AEDD#TRPBF and TPS54202DDCR, the LTC1771ES8#TRPBF uniquely delivers 10µA no-load current with external P-MOSFET flexibility, enabling scalable 1–5A designs across 2.8V–20V inputs - essential for Li-ion-powered equipment where runtime and dropout behavior are critical.
Availability
LTC1771ES8#TRPBF is available at Aetrix Electronics and suitable for cellular telephones, portable instruments, battery-powered equipment, wireless modems, and battery chargers requiring stable component supply across extended production lifecycles.
Supply support for LTC1771ES8#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 its legacy of high-performance analog and power management ICs with rigorous automotive and industrial qualification.
The LTC1771ES8#TRPBF belongs to Linear's legacy current-mode DC/DC controller family, designed specifically for battery-powered applications demanding ultralow quiescent current, wide input range, and robust low-dropout operation.
FAQ
What is the maximum output current supported by the LTC1771ES8#TRPBF?
The LTC1771ES8#TRPBF is a controller-not a regulator-and supports output currents up to 5A depending on the selected external P-channel MOSFET, inductor, and layout thermal design. The current sense threshold (110–180mV) and RSENSE value determine actual current limit; for example, RSENSE = 0.02Ω yields ~5A peak current. Thermal performance in the 8-lead MSOP package limits sustained current to ~3A with proper PCB copper area.
How does Burst Mode™ operation affect the output voltage ripple of the LTC1771ES8#TRPBF?
Burst Mode™ operation in the LTC1771ES8#TRPBF reduces switching frequency at light loads, causing low-frequency (1–10kHz) output voltage ripple due to burst intervals. This ripple is typically <50mV peak-to-peak with proper COUT selection. Adding a 5pF feedforward capacitor across the upper feedback resistor (R2) suppresses this ripple by improving loop response during burst transitions, as confirmed in Figure 1 and Application Note 103.
Can the LTC1771ES8#TRPBF operate with a 2.5V input supply?
No - the LTC1771ES8#TRPBF has a minimum input voltage of 2.8V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 2.8V is not guaranteed and may result in failure to start, unstable regulation, or violation of the 1.23V feedback reference accuracy. For sub-2.8V applications, consider the LTC3642 or LTC3639, which support down to 1.8V input.
What is the purpose of the SENSE pin on the LTC1771ES8#TRPBF, and how is it used?
The SENSE pin on the LTC1771ES8#TRPBF monitors the voltage drop across an external current-sense resistor (RSENSE) connected between VIN and the source of the external P-MOSFET. It sets both the peak switch current limit (110–180mV threshold) and the Burst Mode entry point. Unlike high-side current sensing amplifiers, SENSE operates directly with the MOSFET source node, requiring careful Kelvin routing to avoid noise coupling and ensure accurate current limiting.
Is the LTC1771ES8#TRPBF pin-compatible with the LTC1771IS8 or LTC1771E versions?
Yes - the LTC1771ES8#TRPBF, LTC1771IS8, and LTC1771E share identical 8-lead MSOP (MS8) pinouts and electrical functionality. The only differences are temperature grade: E-grade is specified from 0°C to 70°C (with assured –40°C to 85°C performance), while I-grade is fully tested and guaranteed over –40°C to 85°C. All three use the same footprint, layout, and external components.
LTC1771ES8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 2.8V ~ 18V
- Frequency - Switching:
- -
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Soft Start
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1771ES8#TRPBF FAQ
1.How can I place an order for LTC1771ES8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1771ES8#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 LTC1771ES8#TRPBF reliable?
The price and inventory of LTC1771ES8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1771ES8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1771ES8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1771ES8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1771ES8#TRPBF?
LTC1771ES8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1771ES8#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 LTC1771ES8#TRPBF?
For technical support, including LTC1771ES8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1771ES8#TRPBF requirements.
6.How does Aetrix verify that LTC1771ES8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1771ES8#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 LTC1771ES8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1771ES8#TRPBF?
All LTC1771ES8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1771ES8#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 LTC1771ES8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1771ES8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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