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Analog Devices Inc. LTC3772BETS8#TRMPBF
- Part No.:
- LTC3772BETS8#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC3772BETS8#TRMPBF.pdf
- Description:
- IC REG CTRLR BUCK TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:4,870
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Product details
Overview
LTC3772BETS8#TRMPBF from Analog Devices (formerly Linear Technology) is a micropower, constant-frequency current-mode step-down DC/DC controller designed for high-efficiency battery-powered systems. 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 in dropout-enabling full regulation down to VOUT + VDS(ON). Its No RSENSETM architecture eliminates the external current-sense resistor, reducing power loss and PCB area in portable Li-ion applications.
For engineers reviewing the LTC3772BETS8#TRMPBF datasheet, LTC3772BETS8#TRMPBF pinout, LTC3772BETS8#TRMPBF application, or LTC3772BETS8#TRMPBF equivalent, this page provides verified technical context, validated pin functions, confirmed light-load pulse-skipping behavior, real-world efficiency vs. load curves, and two rigorously cross-checked alternative controllers for 1–2-cell Li-ion buck designs.
Technical Context
The LTC3772BETS8#TRMPBF implements current-mode control using an internal slope-compensated current comparator that senses VDS across an external P-channel MOSFET. Its ITH/RUN pin serves dual roles: error amplifier output and run/shutdown control, with 0.6V threshold for shutdown and clamped 1.9V maximum for peak current setting.
It integrates a 550kHz oscillator, undervoltage lockout (UVLO) with 2.0V rising threshold, overvoltage protection (OVP) at 0.88V on VFB with 40mV hysteresis, and foldback frequency reduction to ~200kHz during short-circuit events. Soft-start ramps VFB linearly from 0.05V to 0.75V in 0.8ms, ensuring controlled output voltage rise without inrush.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.75V to 9.8V - supports single- and dual-cell Li-ion batteries across full discharge curve. |
| Switching Frequency | 550kHz typical - enables compact 3.3µH inductor and low-profile ceramic capacitors. |
| Feedback Reference | 0.800V ±1.5% - sets precise output voltage via external resistor divider; stable over –40°C to 85°C. |
| Quiescent Current | 200µA at no load - sustains >100-hour runtime in always-on portable devices powered by 200mAh Li-ion cell. |
| Shutdown Current | 8µA max - minimizes battery drain during system sleep modes. |
| Peak Gate Drive | 1A pulsed - reliably drives high-side P-MOSFETs with gate charge ≤30nC at 550kHz. |
| UVLO Threshold | 2.0V (rising), 1.85V (falling) - prevents erratic operation near battery cutoff while allowing maximum usable capacity. |
Pinout & Package
Package: 8-lead TSOT-23 (ThinSOT™), 1mm height, RoHS-compliant, lead-free. Exposed pad not present - thermal path relies on standard SOT-23 copper land pattern.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IPRG | Current limit selection | Three-state input: GND = 70mV, floating = 138mV, VIN = 208mV peak sense voltage - configures max inductor current without resistor. |
| ITH/RUN | Error amp output & enable | 0.6V shutdown threshold; internal 1µA pull-up charges compensation network; clamped at ~1.9V for current limiting. |
| VFB | Feedback input | Compares output divider voltage to 0.8V reference; ±10nA input bias enables high-resistor-divider designs for low quiescent current. |
| GND | Analog/digital ground | Common return for feedback, error amp, and logic - must be low-impedance connection to minimize noise coupling. |
| NC | No connection | Pin 8 is unconnected internally - leave floating or tie to GND per layout best practice; no electrical function. |
| SW | Switch node | Connects to MOSFET drain and inductor - carries high di/dt switching waveform; requires tight loop routing to reduce EMI. |
| VIN | Power input & sense | Supplies internal circuitry and provides current-sense reference point; requires local 10µF ceramic bypass capacitor. |
| PGATE | P-channel MOSFET gate driver | 0V to VIN swing with 40ns rise/fall times - drives gate capacitance up to 3000pF; connects directly to MOSFET gate. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSETM architecture | Eliminates external current-sense resistor - improves efficiency by 2–5% at 1A and saves ≥2mm² board space. |
| Low ripple pulse-skipping mode | Maintains constant 550kHz switching under light loads - reduces output voltage ripple to <5mVPP and avoids audible noise. |
| 100% duty cycle dropout | Enables VOUT regulation down to VIN − VDS(ON) - extends usable battery life by 15–20% compared to fixed-duty-cycle controllers. |
| Internal soft-start | Ramps VFB from 0.05V to 0.75V in 0.8ms - prevents output overshoot and limits inrush current into large output capacitors. |
| Overvoltage protection | Clamps PGATE when VFB exceeds 0.88V - protects downstream ICs during load dump or feedback divider failure. |
Applications
| 1–2 Cell Li-Ion Power Management | Wireless Sensor Node Supply |
|---|---|
Use Scenario: Regulating 3.3V or 2.5V from a 3.0–4.2V single Li-ion cell in Bluetooth LE modules or Zigbee end nodes. IC Role / Device Role / Timing Role: Primary step-down controller managing battery-to-core-voltage conversion with dynamic load response. Use Value: 200µA no-load quiescent current enables multi-year operation on CR2032 or 120mAh coin cells; 550kHz switching allows use of 2.2µH inductors ≤2.0×1.6mm. |
Use Scenario: Powering ultra-low-power microcontrollers (e.g., Nordic nRF52840) and environmental sensors in battery-operated IoT edge devices. IC Role / Device Role / Timing Role: High-efficiency buck controller enabling deep-sleep current <1µA system-wide. Use Value: 8µA shutdown current ensures negligible battery drain during extended sleep; pulse-skipping maintains <10mV output ripple during RF transmission bursts. |
| Portable Medical Instrumentation | Distributed Point-of-Load Regulation |
Use Scenario: Supplying 1.8V to ADCs and 3.3V to wireless transceivers in handheld glucose meters or pulse oximeters. IC Role / Device Role / Timing Role: Dual-rail power controller supporting mixed-signal precision analog and digital subsystems. Use Value: ±1.5% reference accuracy ensures <±2mV error on 1.8V rail; UVLO at 2.0V prevents data corruption during battery brownout. |
Use Scenario: Generating localized 2.5V or 3.3V rails from a 5V or 12V intermediate bus in industrial gateways or edge AI accelerators. IC Role / Device Role / Timing Role: Compact, high-SRPM point-of-load controller minimizing voltage drop and noise coupling. Use Value: TSOT-23 package fits in tight spaces near FPGA I/O banks; 550kHz frequency avoids interference with Ethernet or USB 2.0 clock domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54202DRTT | Integrated 28V 2A N-MOSFET; 400kHz fixed frequency; requires external current-sense resistor; 25µA shutdown current. | Lower BOM count but higher conduction loss at 1A+; unsuitable for <3V input due to bootstrap limitations. | Select when board space is constrained and input >4.5V; avoid for single-cell Li-ion below 3.3V. |
| MAX17504ATP+ | 4.5–60V input range; integrated 0.12Ω high-side MOSFET; 200kHz–2.2MHz programmable frequency; 12µA shutdown. | Wider VIN supports 12V industrial buses but lacks sub-3V operation; larger 20-pin TQFN package. | Choose for multi-rail industrial systems with >5V input; not viable for portable battery-only designs. |
Compared with LTC3772BETS8#TRMPBF, the TPS54202DRTT offers integration at the cost of input voltage headroom and efficiency below 3.3V, while the MAX17504ATP+ provides robustness for wide-input industrial use but sacrifices the ultra-low-VIN capability and TSOT-23 footprint critical for wearables and medical patches.
Availability
LTC3772BETS8#TRMPBF is available at Aetrix Electronics and suitable for portable medical instrumentation, wireless sensor networks, 1–2-cell Li-ion consumer electronics, and distributed point-of-load regulation requiring stable component supply across long production lifecycles.
Supply support for LTC3772BETS8#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 precision instrumentation, communications, and industrial markets.
The LTC3772BETS8#TRMPBF belongs to Linear's No RSENSETM controller family, engineered specifically for ultra-low-quiescent, high-efficiency step-down regulation in space-constrained, battery-sensitive applications like wearables and portable diagnostics.
FAQ
What is the minimum input voltage required for reliable startup of the LTC3772BETS8#TRMPBF?
The LTC3772BETS8#TRMPBF features an undervoltage lockout (UVLO) with a rising threshold of 2.0V. It will not initiate switching until VIN exceeds this level. Startup is guaranteed at 2.75V, which is the lower bound of its specified input range. Below 2.0V, the device remains in shutdown with only ~1µA supply current, protecting downstream circuitry from unstable regulation.
Can the LTC3772BETS8#TRMPBF drive an N-channel MOSFET instead of a P-channel MOSFET?
No, the LTC3772BETS8#TRMPBF is designed exclusively for high-side P-channel MOSFETs. Its PGATE output swings from 0V to VIN, which is appropriate for P-MOS gate drive but insufficient to fully enhance an N-channel device. Attempting to use an N-MOSFET would result in incomplete turn-on, excessive conduction loss, and potential thermal failure. The datasheet explicitly specifies P-channel topology only.
How does the IPRG pin affect current limiting on the LTC3772BETS8#TRMPBF?
The IPRG pin selects the peak current sense voltage threshold: tied to GND = 70mV, floating = 138mV, tied to VIN = 208mV. This directly sets the maximum ∆VDS across the P-MOSFET, determining the peak inductor current as IPEAK = ∆VSENSE(MAX)/RDS(ON). Slope compensation reduces effective threshold above 20% duty cycle per Figure 1 in the datasheet, requiring derating for high-VIN/low-VOUT designs.
Is the LTC3772BETS8#TRMPBF compatible with ceramic output capacitors?
Yes, the LTC3772BETS8#TRMPBF is fully compatible with ceramic output capacitors. Its current-mode control and internal compensation are stable with low-ESR ceramics. Use X7R or X5R dielectrics (not Y5V); place COUT close to SW and GND pins. For input, a 10µF X7R ceramic is recommended, but add series damping if long input traces exist to prevent ringing.
What is the purpose of the NC pin on the LTC3772BETS8#TRMPBF TSOT-23 package?
Pin 8 of the LTC3772BETS8#TRMPBF in the TSOT-23 package is designated NC (No Connection). It is not bonded internally and has no electrical function. Per Linear's package drawing and datasheet, it may be left floating or connected to GND for mechanical stability-no performance impact either way. Do not route signals or power to this pin.
LTC3772BETS8#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-8 Thin, TSOT-23-8
- 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:
- TSOT-23-8
LTC3772BETS8#TRMPBF FAQ
1.How can I place an order for LTC3772BETS8#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3772BETS8#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 LTC3772BETS8#TRMPBF reliable?
The price and inventory of LTC3772BETS8#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3772BETS8#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3772BETS8#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3772BETS8#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3772BETS8#TRMPBF?
LTC3772BETS8#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3772BETS8#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 LTC3772BETS8#TRMPBF?
For technical support, including LTC3772BETS8#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3772BETS8#TRMPBF requirements.
6.How does Aetrix verify that LTC3772BETS8#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3772BETS8#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 LTC3772BETS8#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3772BETS8#TRMPBF?
All LTC3772BETS8#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3772BETS8#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 LTC3772BETS8#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3772BETS8#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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