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Analog Devices Inc. LTC3772EDDB#TRPBF
- Part No.:
- LTC3772EDDB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3772EDDB#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,445
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Product details
Overview
LTC3772EDDB#TRPBF 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 eliminates the need for an external current-sense resistor via No RSENSE™ architecture, operates from 2.75V to 9.8V input, delivers output as low as 0.8V with ±1.5% reference accuracy, and achieves 550kHz fixed-frequency switching for compact magnetics-used in Li-ion–powered portable computers and wireless devices.
For engineers reviewing the LTC3772EDDB#TRPBF datasheet, LTC3772EDDB#TRPBF pinout, LTC3772EDDB#TRPBF application, or LTC3772EDDB#TRPBF equivalent, key selection considerations include its 40µA no-load quiescent current, 100% duty-cycle dropout operation, IPRG-selectable peak current thresholds (105/175/245mV), Burst Mode® efficiency optimization at light load, and thermal performance enabled by exposed-pad grounding.
Technical Context
The LTC3772EDDB#TRPBF implements current-mode control with internal slope compensation activated above 20% duty cycle, enabling stable regulation across wide VIN/VOUT ratios. Its error amplifier drives the ITH/RUN node to regulate peak inductor current, while UVLO (2.0V rising threshold) and overvoltage protection (0.88V trip, 40mV hysteresis) ensure safe operation during fault conditions.
Burst Mode® operation engages below ~10% of maximum load, clamping ITH/RUN at 0.925V and reducing supply current to 40µA; shutdown draws only 8µA. The IPRG pin selects one of three peak sense voltage thresholds-105mV (IPRG = GND), 175mV (IPRG = floating), or 245mV (IPRG = VIN)-directly setting maximum MOSFET conduction current without external sensing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.75V to 9.8V - supports single/dual-cell Li-ion battery input without external regulators. |
| Switching Frequency | 550kHz (typ) - enables use of sub-4.7µH inductors and low-ESR ceramic capacitors. |
| Feedback Reference | 0.800V ±1.5% - sets precise output voltage via external resistor divider; line/load regulation <0.2mV/V and <0.2%. |
| No-Load Quiescent Current | 40µA - extends battery runtime in always-on portable systems. |
| Shutdown Current | 8µA - minimizes leakage in system-level power gating. |
| Peak Sense Threshold Options | 105/175/245mV - selected by IPRG pin state to match P-MOSFET RDS(ON) and target output current. |
| UVLO Threshold | 2.0V (rising), 1.85V (falling) - prevents unstable startup or dropout operation with weak batteries. |
Pinout & Package
Package: 8-lead (3mm × 2mm) plastic DFN with exposed pad (Pin 9), 0.75mm height. Exposed pad must be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 4) | Power and signal ground reference | Primary return path for internal circuitry and PGATE driver; connects to exposed pad. |
| VFB (Pin 3) | Feedback input | Monitors output voltage via resistor divider; regulates to 0.8V reference; max input voltage 2.4V. |
| ITH/RUN (Pin 2) | Error amplifier output / enable control | Sets peak inductor current; pulled up by 1µA source; <0.6V forces shutdown; clamp limits max to ~1.9V. |
| IPRG (Pin 1) | Current limit programming | Selects peak sense threshold: GND=105mV, float=175mV, VIN=245mV - configures current capability without resistors. |
| NC (Pin 8) | No connection | Not internally bonded; must remain unconnected. |
| SW (Pin 7) | Switch node | Connects to P-MOSFET drain and inductor; handles high dv/dt; rated –2V to (VIN +1V). |
| VIN (Pin 6) | Input supply and sense input | Supplies IC bias and senses P-MOSFET source voltage; requires local 10µF ceramic decoupling to GND. |
| PGATE (Pin 5) | P-channel MOSFET gate driver | Drives external P-MOSFET gate from 0V to VIN; 1A peak drive capability; rise/fall time ≤40ns (3000pF load). |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE™ architecture | Eliminates external current-sense resistor - improves efficiency by ~2–4% and saves >2mm² board area. |
| Low-ripple Burst Mode® | Maintains <10mVpp output ripple at light load while achieving >85% efficiency at 1mA output. |
| 100% duty-cycle dropout | Extends usable battery range by sustaining regulation down to VIN = VOUT; critical for single-cell Li-ion (2.7V cutoff). |
| Internal soft-start | 0.6ms linear ramp on VOUT - prevents inrush current and ensures monotonic startup into capacitive loads. |
| Thermal-enhanced DFN | Exposed pad reduces θJA to 76°C/W - allows 1.2W continuous power dissipation at TA = 85°C. |
Applications
| Portable Computers | Wireless Communication Modules |
|---|---|
Use Scenario: Core voltage regulation for ARM-based application processors in ultra-thin notebooks powered by 1-cell Li-ion (3.0–4.2V). IC Role / Device Role / Timing Role: Step-down controller managing dynamic load steps up to 2A while maintaining 0.8V ±1.5% output under 550kHz switching. Use Value: 40µA quiescent current extends standby time beyond 14 days; Burst Mode® maintains >90% efficiency at 50mA load. | Use Scenario: Powering RF transceivers (e.g., Bluetooth LE, Zigbee) in battery-operated IoT sensors with strict sleep-current budgets. IC Role / Device Role / Timing Role: Primary DC/DC controller delivering 1.8V/2.5V/3.3V from variable battery input; synchronized via external clock disable for EMI control. Use Value: Shutdown current of 8µA enables multi-year battery life; IPRG-selectable current limit matches low-RDS(ON) P-MOSFETs for minimal dropout loss. |
| Distributed Power Systems | Li-ion–Powered Medical Wearables |
Use Scenario: Intermediate bus conversion in modular industrial controllers where 5V or 7V rails feed point-of-load regulators. IC Role / Device Role / Timing Role: High-efficiency buck controller operating at 550kHz to minimize filter size; supports remote sensing via Kelvin-connected VFB traces. Use Value: Wide 2.75–9.8V input range accommodates aging batteries and upstream DC-DC variations; ±1.5% reference ensures downstream ADC accuracy. | Use Scenario: Regulating sensor and microcontroller supply in FDA-cleared wearable ECG patches using 3.7V Li-ion cells. IC Role / Device Role / Timing Role: Safety-critical power controller with UVLO (2.0V) and overvoltage lockout (0.88V) to prevent erroneous readings during battery depletion. Use Value: Exposed-pad DFN meets IPC-7351B thermal requirements for flex-rigid PCBs; 125°C junction rating supports sterilization cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2315DJ-LF-Z | Integrated 2A MOSFETs; fixed 500kHz frequency; no IPRG pin; requires external current-sense resistor. | Lower BOM count but higher conduction loss at >1.5A; unsuitable for ultra-low-IQ designs. | Choose MP2315 for cost-sensitive, medium-current (<1.2A) applications where board space is less constrained than quiescent current. |
| TPS562210ADDFR | Integrated 2A FETs; 650kHz frequency; 18µA IQ; no programmable current limit; uses external resistor for current sensing. | Superior light-load efficiency but lacks No RSENSE™ architecture and 100% dropout capability. | Prefer TPS562210A when lowest possible no-load current is mandatory and input never drops below 3.0V. |
Compared with MP2315DJ-LF-Z and TPS562210ADDFR, the LTC3772EDDB#TRPBF uniquely combines resistorless current sensing, 40µA no-load IQ, and true 100% duty-cycle operation-making it optimal for long-life, battery-critical, high-input-range buck controller designs where external MOSFET selection enables thermal and efficiency tailoring.
Availability
LTC3772EDDB#TRPBF is available at Aetrix Electronics and suitable for portable computers, wireless communication modules, distributed power systems, and Li-ion–powered medical wearables requiring stable component supply across extended production lifecycles.
Supply support for LTC3772EDDB#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, documentation, and manufacturing continuity for the LTC portfolio.
The LTC3772EDDB#TRPBF belongs to Linear's precision micropower DC/DC controller family, designed specifically for high-efficiency, low-quiescent-current battery-powered applications where resistorless current sensing and wide input range are essential.
FAQ
What is the absolute maximum input voltage rating for the LTC3772EDDB#TRPBF?
The LTC3772EDDB#TRPBF has an absolute maximum input voltage (VIN) rating of 10V. Exceeding this value-even momentarily-may cause permanent damage. The recommended operating range remains 2.75V to 9.8V per datasheet specifications. Input transient suppression is advised if the source can exceed 10V, such as during hot-swap or load-dump events.
How does the IPRG pin affect current limiting on the LTC3772EDDB#TRPBF?
The IPRG pin on the LTC3772EDDB#TRPBF selects the peak current sense threshold: 105mV when tied to GND, 175mV when left floating, and 245mV when connected to VIN. This directly determines the maximum inductor peak current via IPEAK = ΔVSENSE(MAX)/RDS(ON), enabling precise current-limit tuning without external components.
Does the LTC3772EDDB#TRPBF require an external catch diode?
Yes, the LTC3772EDDB#TRPBF requires an external Schottky catch diode connected from SW to GND. As a controller (not converter), it drives only the P-channel MOSFET gate; the diode provides the off-time current path. Fast-recovery or low-VF Schottky types (e.g., PMEG4005AEJ) are recommended to minimize conduction loss and improve light-load efficiency.
What is the purpose of the exposed pad on the LTC3772EDDB#TRPBF DFN package?
The exposed pad (Pin 9) on the LTC3772EDDB#TRPBF is electrically and thermally connected to GND. It must be soldered to a PCB copper pour to achieve the specified θJA = 76°C/W and ensure reliable operation at full load. Omitting this connection raises junction temperature by >30°C and risks thermal shutdown or long-term reliability degradation.
Can the LTC3772EDDB#TRPBF operate with a 1.8V input supply?
No-the LTC3772EDDB#TRPBF has a minimum operating input voltage of 2.75V and an undervoltage lockout (UVLO) threshold of 2.0V (rising). At 1.8V, the device remains disabled with PGATE held high and zero output regulation. It is not suitable for sub-2.75V battery chemistries like NiMH or partially depleted LiFePO₄ without a pre-regulator.
LTC3772EDDB#TRPBF 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:
- 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)
LTC3772EDDB#TRPBF FAQ
1.How can I place an order for LTC3772EDDB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3772EDDB#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 LTC3772EDDB#TRPBF reliable?
The price and inventory of LTC3772EDDB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3772EDDB#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3772EDDB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3772EDDB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3772EDDB#TRPBF?
LTC3772EDDB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3772EDDB#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 LTC3772EDDB#TRPBF?
For technical support, including LTC3772EDDB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3772EDDB#TRPBF requirements.
6.How does Aetrix verify that LTC3772EDDB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3772EDDB#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 LTC3772EDDB#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3772EDDB#TRPBF?
All LTC3772EDDB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3772EDDB#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 LTC3772EDDB#TRPBF part is unused and in its original packaging.
Return procedure for LTC3772EDDB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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