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Analog Devices Inc. LTC3772BEDDB#TRMPBF
- Part No.:
- LTC3772BEDDB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3772BEDDB#TRMPBF.pdf
- Description:
- IC REG CTRLR BUCK 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,211
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Product details
Overview
LTC3772BEDDB#TRMPBF from Analog Devices (formerly Linear Technology) is a micropower, constant-frequency current-mode step-down DC/DC controller in an 8-lead 3mm × 2mm DFN package. It operates from 2.75V to 9.8V input, delivers output voltages as low as 0.8V with ±1.5% reference accuracy, and achieves 100% duty cycle for ultra-low dropout-enabling efficient power conversion in single- or dual-cell Li-ion battery-powered portable computers and wireless devices.
For engineers reviewing the LTC3772BEDDB#TRMPBF datasheet, LTC3772BEDDB#TRMPBF pinout, LTC3772BEDDB#TRMPBF application, or LTC3772BEDDB#TRMPBF equivalent, key selection considerations include its No RSENSE™ architecture eliminating external sense resistors, 550kHz fixed switching frequency enabling compact magnetics, pulse-skipping light-load operation, internal soft-start, and IPRG-selectable peak current thresholds (70mV/138mV/208mV) for optimized MOSFET sizing.
Technical Context
The LTC3772BEDDB#TRMPBF implements current-mode control with slope compensation activated above 20% duty cycle, using the ITH/RUN pin as both error amplifier output and run control input. Its UVLO threshold is 2.0V (rising), and it features foldback frequency reduction to ~200kHz during output short-circuit events to limit inductor current.
It drives an external P-channel MOSFET via PGATE with rail-to-rail swing (0V to VIN), senses current via VIN–SW differential voltage, and uses VFB feedback referenced to a precise 0.800V internal bandgap. The exposed pad (Pin 9) is GND and must be soldered for thermal and electrical integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.75V to 9.8V - supports direct regulation from 1–2 cell Li-ion batteries without pre-regulation |
| Switching Frequency | 550kHz (typ) - enables use of small 2.2µH–4.7µH inductors and low-ESR ceramic capacitors |
| Feedback Reference Voltage | 0.800V ±1.5% - sets output voltage via resistor divider; enables 0.8V minimum VOUT with tight tolerance |
| Quiescent Current (No Load) | 200µA (typ) - minimizes battery drain in always-on portable systems |
| Shutdown Supply Current | 8µA (typ) - extends shelf life and standby time in battery-powered applications |
| Peak Gate Drive Current | 1A (pulse, <10µs) - ensures fast turn-on of high-side P-MOSFETs with low gate charge |
| UVLO Threshold | 2.0V (rising), 1.85V (falling) - prevents unstable operation near battery depletion |
| Soft-Start Time | 0.8ms (VFB ramp from 0.05V to 0.75V) - controls inrush current and prevents output overshoot at startup |
Pinout & Package
Package: 8-lead (3mm × 2mm) plastic DFN with exposed pad (Pin 9 = GND). Requires soldering of exposed pad to PCB ground plane for thermal management and signal integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IPRG (Pin 1) | Current limit select input | Three-state logic: GND = 70mV, float = 138mV, VIN = 208mV peak sense threshold - configures max inductor current without changing external components |
| ITH/RUN (Pin 2) | Error amp output / enable control | Drives compensation network; <0.6V disables regulator; internal 1µA pull-up enables soft-start on release |
| VFB (Pin 3) | Feedback input | Compares output divider voltage to 0.800V reference; high-impedance (±10nA) for minimal divider loading |
| GND (Pin 4) | Power and signal ground | Reference for all analog circuitry; connects to exposed pad (Pin 9) - must be low-impedance PCB plane |
| NC (Pin 5) | No connection | Not internally bonded - leave unconnected and unrouted |
| VIN (Pin 6) | Supply and current sense input | Provides bias power and serves as high-side current sense reference (with SW pin) |
| SW (Pin 7) | Switch node | Connects to P-MOSFET drain and inductor; carries high di/dt - requires tight layout and Kelvin sensing |
| PGATE (Pin 8) | P-channel MOSFET gate driver | Swings 0V to VIN; 1A peak drive capability supports fast switching of low-RDS(ON) MOSFETs |
| Exposed Pad (Pin 9) | Thermal and electrical ground | Must be soldered to ≥100mm² copper area - improves θJA by >30°C/W and stabilizes ground reference |
Key Features
| Feature | Design Value |
|---|---|
| No external current sense resistor | Eliminates 5–20mΩ sense loss and board space; improves full-load efficiency by 1–3% vs RSENSE-based controllers |
| 100% duty cycle operation | Enables dropout mode when VIN ≈ VOUT - maintains regulation down to VIN = VOUT + IRDS(ON) + VD |
| Pulse-skipping at light load | Maintains constant 550kHz switching under medium loads, then skips cycles below ~50mA to reduce quiescent current to 200µA |
| Internal soft-start ramp | Linear 0.8ms VFB ramp prevents output overshoot and limits inrush into large output capacitors (e.g., 47µF ceramic) |
| IPRG-selectable current limit | Hardware-configurable peak sense thresholds (70/138/208mV) allow one controller design to support 1A, 2A, or 3A output variants |
| Overvoltage protection (OVP) | Shuts off PGATE if VFB exceeds 0.880V (10% overregulation); 40mV hysteresis prevents chatter during transients |
Applications
| Portable Computers | Wireless Communication Modules |
|---|---|
Use Scenario: Powering core logic (SoC I/O, memory interface) from 3.3V or 5V battery rails in ultrabooks and 2-in-1 tablets. IC Role / Device Role / Timing Role: Step-down controller regulating stable 1.8V or 2.5V supply with fast transient response to CPU burst loads. Use Value: 550kHz operation allows 3.3µH inductor and 22µF ceramic output cap; 200µA no-load current extends battery runtime by >8 hours in suspend mode. |
Use Scenario: Generating 3.3V supply for Bluetooth/Wi-Fi modules in handheld IoT sensors and asset trackers. IC Role / Device Role / Timing Role: Primary DC/DC controller managing battery-to-3.3V conversion with shutdown control via host MCU GPIO. Use Value: 8µA shutdown current enables multi-year operation on coin-cell batteries; IPRG pin simplifies BOM across multiple module SKUs. |
| Distributed Power Systems | Li-ion Battery-Powered Medical Devices |
Use Scenario: Local point-of-load regulation in industrial gateways where 12V backplane powers isolated 5V/3.3V rails. IC Role / Device Role / Timing Role: Secondary buck controller providing clean, low-noise 3.3V for microcontrollers and ADCs in noise-sensitive subsystems. Use Value: Pulse-skipping reduces conducted EMI at light load; low 0.2mV/V line regulation ensures stable VOUT across 2.75–9.8V input range. |
Use Scenario: Powering patient-monitoring front-end (ECG amplifiers, OLED display) from 3.7V single-cell Li-ion packs. IC Role / Device Role / Timing Role: High-accuracy, low-noise power controller delivering regulated 2.5V with ±1.5% initial tolerance and <10mV ripple. Use Value: ±1.5% VREF and 0.8V min output enable precise sensor biasing; exposed-pad DFN ensures thermal stability during continuous 24/7 operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8609S | Integrated 2.5A synchronous buck regulator (vs external FET); 200kHz–3MHz adjustable frequency; higher IQ (2.5µA shutdown) | Replaces discrete controller+MOSFET solution with single-chip design; better for space-constrained layouts but less flexible FET selection | Choose LT8609S when board area is critical and 2.5A integrated switch suffices; LTC3772BEDDB#TRMPBF preferred when >3A output or custom MOSFET optimization required. |
| TPS54202 | Integrated 2A synchronous buck; 4.5–17V input; 500kHz fixed freq; 1.5% VREF; no IPRG pin or No RSENSE architecture | Lacks programmable current limit and resistorless sensing; requires external sense resistor for current monitoring | Select TPS54202 for simpler designs needing only basic 2A regulation; LTC3772BEDDB#TRMPBF offers superior efficiency at high current and greater design flexibility via external MOSFET control. |
Compared with LT8609S and TPS54202, the LTC3772BEDDB#TRMPBF provides unique advantages in ultra-low-input-voltage operation (2.75V start), No RSENSE efficiency gains, and hardware-selectable current limits-making it optimal for Li-ion-powered systems demanding >2A output and thermal headroom via discrete FETs.
Availability
LTC3772BEDDB#TRMPBF is available at Aetrix Electronics and suitable for portable computers, wireless communication modules, distributed power systems, and Li-ion battery-powered medical devices requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3772BEDDB#TRMPBF 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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3772BEDDB#TRMPBF belongs to Linear's No RSENSE™ controller family, designed specifically for high-efficiency, low-component-count DC/DC conversion in battery-powered portable electronics where board space and quiescent current are critical constraints.
FAQ
What is the maximum output current achievable with the LTC3772BEDDB#TRMPBF?
The LTC3772BEDDB#TRMPBF does not define a fixed maximum output current-it depends on the selected external P-channel MOSFET, inductor, and thermal design. With a 20mΩ RDS(ON) MOSFET and IPRG tied to GND (70mV threshold), peak inductor current reaches ~3.5A. Real-world continuous output is typically 2A–2.5A with proper layout and heatsinking. The LTC3772BEDDB#TRMPBF datasheet provides detailed equations for calculating IOUT(MAX) based on RDS(ON), duty cycle, and slope compensation.
Does the LTC3772BEDDB#TRMPBF require an external current sense resistor?
No-the LTC3772BEDDB#TRMPBF uses its proprietary No RSENSE™ architecture to sense current via the voltage drop across the external P-channel MOSFET's RDS(ON), eliminating the need for a discrete current sense resistor. This improves efficiency by removing I²R losses and saves PCB area. The IPRG pin selects the effective sense threshold (70mV/138mV/208mV), allowing optimization without changing passive components.
How does the LTC3772BEDDB#TRMPBF handle short-circuit conditions?
During an output short, the LTC3772BEDDB#TRMPBF reduces oscillator frequency from 550kHz to ~200kHz while maintaining minimum on-time. This foldback action limits peak inductor current and prevents thermal runaway. Once the short is removed, frequency ramps back to 550kHz as VFB recovers through 0.3V toward 0.8V. Overvoltage protection also disables PGATE if VFB exceeds 0.880V, adding redundant safety.
What is the role of the exposed pad (Pin 9) on the LTC3772BEDDB#TRMPBF DFN package?
The exposed pad (Pin 9) on the LTC3772BEDDB#TRMPBF is electrically connected to GND and serves dual thermal and electrical functions. It must be soldered to a dedicated PCB ground plane of ≥100mm² to achieve specified θJA = 76°C/W and ensure stable operation. Leaving it unconnected degrades thermal performance by >30°C/W and may cause ground bounce or regulation instability due to elevated GND impedance.
Can the LTC3772BEDDB#TRMPBF operate with input voltages below 3V?
Yes-the LTC3772BEDDB#TRMPBF supports input voltages as low as 2.75V and includes undervoltage lockout (UVLO) that disables operation only when VIN falls below 1.85V (falling threshold). This enables reliable startup and regulation directly from partially discharged single-cell Li-ion batteries (2.8V–4.2V), making it ideal for portable applications where deep discharge tolerance is essential. The 100% duty cycle feature further extends usable battery range.
LTC3772BEDDB#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- 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):
- 2.75V ~ 9.8V
- Frequency - Switching:
- 200kHz ~ 550kHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LTC3772BEDDB#TRMPBF FAQ
1.How can I place an order for LTC3772BEDDB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3772BEDDB#TRMPBF 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 LTC3772BEDDB#TRMPBF reliable?
The price and inventory of LTC3772BEDDB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3772BEDDB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3772BEDDB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3772BEDDB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3772BEDDB#TRMPBF?
LTC3772BEDDB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3772BEDDB#TRMPBF 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 LTC3772BEDDB#TRMPBF?
For technical support, including LTC3772BEDDB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3772BEDDB#TRMPBF requirements.
6.How does Aetrix verify that LTC3772BEDDB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3772BEDDB#TRMPBF 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 LTC3772BEDDB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3772BEDDB#TRMPBF?
All LTC3772BEDDB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3772BEDDB#TRMPBF, 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 LTC3772BEDDB#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3772BEDDB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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