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Analog Devices Inc. LTC3772EDDB#TRMPBF
- Part No.:
- LTC3772EDDB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3772EDDB#TRMPBF.pdf
- Description:
- IC REG CTRLR BUCK 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
LTC3772EDDB#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 eliminates the need for an external current-sense resistor via No RSENSE™ architecture, supports input voltages from 2.75V to 9.8V, delivers output as low as 0.8V with ±1.5% reference accuracy, and operates at 550kHz with 40µA no-load quiescent current-ideal for Li-ion–powered portable computers and wireless devices.
For engineers reviewing the LTC3772EDDB#TRMPBF datasheet, LTC3772EDDB#TRMPBF pinout, LTC3772EDDB#TRMPBF application, or LTC3772EDDB#TRMPBF equivalent, key selection considerations include its 100% duty-cycle dropout capability, IPRG-selectable peak current thresholds (105mV/175mV/245mV), Burst Mode® operation for light-load efficiency, internal soft-start ramp, and exposed-pad thermal management in the DDB package.
Technical Context
The LTC3772EDDB#TRMPBF implements current-mode control using an external P-channel MOSFET, where peak inductor current is regulated by the ITH/RUN voltage and modulated via slope compensation above 20% duty cycle. Its error amplifier compares VFB to a 0.8V internal reference, and the IPRG pin selects one of three fixed peak sense voltage thresholds (105mV, 175mV, or 245mV) by tying to GND, floating, or VIN respectively.
Burst Mode® operation activates below ~10% of maximum load, reducing quiescent current to 40µA by clamping ITH/RUN and cycling the gate drive on/off; undervoltage lockout disables all circuitry below ~2.0V VIN, while short-circuit protection folds oscillator frequency from 550kHz to 200kHz to limit inductor current decay rate.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.75V to 9.8V - supports single/dual Li-ion battery stacks and wide-input industrial rails without external regulators. |
| Switching Frequency | 550kHz (typ) - enables compact 3.3µH inductors and low-profile ceramic capacitors in space-constrained designs. |
| No-Load Quiescent Current | 40µA - extends battery runtime in always-on portable systems with minimal standby power loss. |
| Feedback Reference Voltage | 0.800V ±1.5% - sets precise output regulation down to 0.8V with external resistor divider; line/load regulation <0.2mV/V and <0.2%. |
| Peak Current Sense Threshold | Selectable: 105mV (IPRG = GND), 175mV (IPRG = float), or 245mV (IPRG = VIN) - determines max inductor current without sense resistor, enabling RDS(ON)-based current limiting. |
| Shutdown Current | 8µA (typ) - ensures near-zero power draw during system sleep states; triggered by pulling ITH/RUN below 0.6V. |
| Duty Cycle Capability | 100% - maintains regulation during input voltage droop to VOUT, critical for battery end-of-discharge operation. |
Pinout & Package
Package: 8-lead 3mm × 2mm plastic DFN (DDB) with exposed pad (Pin 9), 0.75mm height. Exposed pad must be soldered to PCB ground plane for electrical continuity and optimal thermal performance (θJA = 76°C/W).
| 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 (Pin 9) for thermal conduction. |
| VFB (Pin 3) | Feedback input | Monitors output voltage via external resistor divider; regulates VOUT to 0.8V reference with ±1.5% accuracy. |
| ITH/RUN (Pin 2) | Error amplifier output & enable control | Sets peak inductor current; pulled up by 1µA source; <0.6V forces shutdown; clamped at ~1.9V max for current limit. |
| IPRG (Pin 1) | Current limit select | Three-state logic: GND = 105mV, float = 175mV, VIN = 245mV - configures max VDS threshold across external P-MOSFET. |
| NC (Pin 8) | No connection | Unbonded; must remain unconnected per datasheet. |
| SW (Pin 7) | Switch node | Connects to P-MOSFET drain and inductor; carries high dv/dt switching waveform; requires tight layout to minimize EMI. |
| VIN (Pin 6) | Input supply & sense | Provides bias power and senses input voltage for UVLO; must be decoupled with low-ESR capacitor close to pin. |
| PGATE (Pin 5) | P-channel MOSFET gate driver | Drives external P-MOSFET gate from 0V to VIN; capable of 1A peak sink/source for fast turn-on/turn-off. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE™ architecture | Eliminates external current-sense resistor, reducing BOM cost, board area, and conduction losses in high-current paths. |
| Low ripple Burst Mode® | Maintains high efficiency (>85%) at light loads (e.g., 10mA) by pulsing PGATE instead of continuous switching, minimizing output voltage ripple. |
| Internal soft-start | 0.6ms linear ramp of VOUT from 0V to regulation point prevents inrush current and ensures controlled power-up sequencing. |
| 100% duty-cycle dropout | Enables uninterrupted operation as input voltage falls to VOUT; P-MOSFET remains fully enhanced, minimizing dropout voltage. |
| Overvoltage protection | Shuts off PGATE if VFB exceeds 0.88V (10% overregulation); 40mV hysteresis prevents chatter during transient recovery. |
Applications
| Portable Computers | Wireless Devices |
|---|---|
Use Scenario: Core voltage regulation for ARM-based SoCs in ultra-thin notebooks powered by 1–2-cell Li-ion batteries. IC Role / Device Role / Timing Role: Step-down DC/DC controller managing dynamic load transients up to 2A while maintaining 0.8V ±1.5% output under 2.75–4.2V input. Use Value: 40µA quiescent current extends battery life in sleep mode; 550kHz switching allows use of 3.3µH inductors and 47µF ceramic output caps for minimal footprint. | Use Scenario: Powering RF transceivers and baseband processors in Bluetooth headsets and IoT sensors. IC Role / Device Role / Timing Role: Primary buck controller delivering stable 1.8V/2.5V/3.3V rails with fast load-step response (<20µs) and low noise for sensitive analog sections. Use Value: Burst Mode® operation sustains >90% efficiency at 100µA load; IPRG-selectable current limits accommodate varying P-MOSFET RDS(ON) across production batches. |
| Distributed Power Systems | Li-Ion Battery-Powered Instruments |
Use Scenario: Local point-of-load conversion in multi-rail test equipment requiring isolated, low-noise 3.3V supplies from 5V or 7V backplanes. IC Role / Device Role / Timing Role: High-efficiency, low-EMI buck controller operating in continuous conduction mode with 550kHz fixed frequency for predictable filter design. Use Value: 100% duty-cycle capability ensures uninterrupted operation during brownouts; exposed-pad DFN package enables thermal management on 2-layer PCBs. | Use Scenario: Power management in handheld medical monitors (e.g., pulse oximeters) running from single-cell Li-ion with strict battery-life requirements. IC Role / Device Role / Timing Role: Micropower step-down controller regulating display backlight and sensor bias rails with <8µA shutdown current. Use Value: UVLO threshold (~2.0V) aligns with Li-ion discharge curve; ±1.5% reference accuracy guarantees consistent ADC reference and sensor excitation voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3780EDD#TRPBF | Wider VIN range (4V–38V), synchronous dual-phase, higher IQ (1.2mA), no No RSENSE™ - requires external sense resistor. | Targeted at higher-input industrial/motor drives, not low-voltage battery systems. | Choose only if input exceeds 9.8V or multiphase operation is required; not drop-in compatible. |
| TPS54202DDCR | Integrated N-MOSFET, lower cost, 4.5–17V VIN, 2A max, 500kHz, but lacks 100% duty cycle and Burst Mode®. | Best for cost-sensitive, medium-input applications where dropout and ultra-low IQ are secondary. | Use when board space permits integrated FET and input voltage stays >4.5V; verify light-load efficiency trade-offs. |
Compared with LTC3772EDDB#TRMPBF, LTC3780EDD#TRPBF supports higher input voltages but sacrifices micropower operation and No RSENSE™ simplicity, while TPS54202DDCR integrates power FETs at the expense of dropout capability and light-load efficiency-making LTC3772EDDB#TRMPBF uniquely suited for compact, battery-critical 2.75–9.8V systems.
Availability
LTC3772EDDB#TRMPBF is available at Aetrix Electronics and suitable for portable computers, wireless devices, and distributed power systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3772EDDB#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3772EDDB#TRMPBF belongs to ADI's legacy Linear Technology power management portfolio, designed specifically for high-efficiency, low-quiescent-current DC/DC control in space- and battery-constrained portable electronics.
FAQ
What is the function of the IPRG pin on the LTC3772EDDB#TRMPBF?
The IPRG pin on the LTC3772EDDB#TRMPBF selects the peak current sense voltage threshold applied across the external P-channel MOSFET: tying to GND sets 105mV, floating sets 175mV, and tying to VIN sets 245mV. This determines the maximum inductor current without requiring a sense resistor, directly impacting output current capability and thermal design of the external FET. The LTC3772EDDB#TRMPBF uses this setting to configure current limiting based on the MOSFET's RDS(ON).
Does the LTC3772EDDB#TRMPBF support 100% duty-cycle operation, and how is it implemented?
Yes, the LTC3772EDDB#TRMPBF supports true 100% duty-cycle operation to maintain regulation as input voltage approaches the output voltage. When VIN drops near VOUT, the controller holds the external P-channel MOSFET continuously on (PGATE = VIN), eliminating switching losses and minimizing dropout voltage. This behavior is intrinsic to its architecture and requires no external configuration-enabling extended runtime from depleting Li-ion cells. The LTC3772EDDB#TRMPBF achieves this without compromising stability or requiring special loop compensation.
How does Burst Mode® operation improve light-load efficiency in the LTC3772EDDB#TRMPBF?
Burst Mode® operation in the LTC3772EDDB#TRMPBF reduces no-load quiescent current to 40µA by disabling switching cycles when load current falls below ~10% of maximum. During bursts, the ITH/RUN pin is clamped to sustain a reduced peak inductor current, and the controller enters sleep until VFB drifts low enough to trigger resumption. This eliminates switching losses at light loads while maintaining low output ripple-critical for battery-powered devices where idle efficiency dominates total energy consumption. The LTC3772EDDB#TRMPBF automatically transitions between modes without external intervention.
What is the purpose of the exposed pad (Pin 9) on the LTC3772EDDB#TRMPBF DFN package?
The exposed pad (Pin 9) on the LTC3772EDDB#TRMPBF DFN package is electrically connected to GND and serves dual thermal and electrical functions: it provides the primary heat dissipation path from the die to the PCB ground plane, lowering junction-to-ambient thermal resistance to 76°C/W, and ensures low-impedance grounding for the internal PGATE driver and power circuits. Per datasheet requirements, the exposed pad must be soldered to a thermally robust PCB copper area-failure to do so risks thermal runaway and premature device failure. The LTC3772EDDB#TRMPBF relies on this pad for reliable operation at full load.
Can the LTC3772EDDB#TRMPBF be used with an N-channel MOSFET instead of a P-channel MOSFET?
No, the LTC3772EDDB#TRMPBF is specifically designed to drive external P-channel MOSFETs only-the PGATE pin sources current from VIN to turn on the FET and sinks to GND to turn it off, matching P-MOSFET gate drive requirements. Its current sensing architecture measures VDS between VIN and SW pins, which assumes high-side P-FET topology. Using an N-channel MOSFET would require bootstrapping, incompatible gate drive polarity, and incorrect current sensing-rendering the LTC3772EDDB#TRMPBF nonfunctional. The datasheet explicitly specifies P-channel FET use throughout.
LTC3772EDDB#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:
- 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#TRMPBF FAQ
1.How can I place an order for LTC3772EDDB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3772EDDB#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 LTC3772EDDB#TRMPBF reliable?
The price and inventory of LTC3772EDDB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3772EDDB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3772EDDB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3772EDDB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3772EDDB#TRMPBF?
LTC3772EDDB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3772EDDB#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 LTC3772EDDB#TRMPBF?
For technical support, including LTC3772EDDB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3772EDDB#TRMPBF requirements.
6.How does Aetrix verify that LTC3772EDDB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3772EDDB#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 LTC3772EDDB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3772EDDB#TRMPBF?
All LTC3772EDDB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3772EDDB#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 LTC3772EDDB#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3772EDDB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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