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Analog Devices Inc. LTC3772BETS8#TRPBF
- Part No.:
- LTC3772BETS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC3772BETS8#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:3,364
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Product details
Overview
LTC3772BETS8#TRPBF from Analog Devices (formerly Linear Technology) is a micropower, constant-frequency current-mode step-down DC/DC controller designed for high-efficiency, low-noise power conversion in 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 for ultra-low dropout operation-enabling extended runtime in 1- or 2-cell Li-ion applications such as portable computers and wireless devices.
For engineers reviewing the LTC3772BETS8#TRPBF datasheet, LTC3772BETS8#TRPBF pinout, LTC3772BETS8#TRPBF application, or LTC3772BETS8#TRPBF equivalent, key selection criteria include its No RSENSE™ architecture eliminating external current-sense resistors, 550kHz fixed switching frequency enabling compact magnetics, pulse-skipping light-load mode, 8µA shutdown current, and dual-package support (SOT-23-8 and DFN-8).
Technical Context
The LTC3772BETS8#TRPBF implements current-mode control with internal slope compensation, where peak inductor current is regulated via voltage across the external P-channel MOSFET's RDS(ON), selected by the IPRG pin (70mV/GND, 138mV/floating, 208mV/VIN). Its error amplifier drives the ITH/RUN node, which serves both as compensation point and enable/shutdown control with 0.6V threshold.
It integrates undervoltage lockout (UVLO) with 2.0V rising threshold, overvoltage protection (OVP) at 0.88V on VFB with 40mV hysteresis, short-circuit foldback (200kHz), and internal soft-start (0.8ms ramp for VFB from 0.05V to 0.75V). Dropout operation maintains regulation down to VIN ≈ VOUT via continuous PGATE high drive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.75V to 9.8V - supports single/dual Li-ion, USB, and distributed supply rails without external LDO pre-regulation. |
| Switching Frequency | 550kHz (typ) - enables use of ≤3.3µH inductors and small ceramic capacitors for space-constrained designs. |
| Feedback Reference Voltage | 0.800V ±1.5% - sets precise output regulation; allows 0.8V–5V outputs using standard resistor dividers. |
| Quiescent Current (No Load) | 200µA (typ) - minimizes battery drain in always-on subsystems; drops to 8µA in shutdown. |
| Peak Gate Drive Current | 1A (pulse, <10µs) - reliably drives high-capacitance P-MOSFETs with fast rise/fall times (40ns). |
| UVLO Threshold | 2.0V (rising), 1.85V (falling) - prevents unstable operation during battery sag while ensuring clean startup. |
| Soft-Start Time | 0.8ms (VFB 0.05V → 0.75V) - controls inrush current and avoids output overshoot during power-up. |
Pinout & Package
Package: 8-lead TSOT-23 (ThinSOT™), 1mm height, RoHS-compliant, lead-free (PBF). Exposed pad not present - thermal path relies on PCB copper under leads.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IPRG) | Current limit select input | Three-state logic: GND = 70mV, floating = 138mV, VIN = 208mV - configures max MOSFET conduction current without sense resistor. |
| 2 (ITH/RUN) | Error amp output / enable control | Drives external compensation network; <0.6V disables regulator; internal 1µA pull-up enables soft-start on release. |
| 3 (VFB) | Feedback input | Compares output divider voltage to 0.8V reference; ±10nA input bias enables high-resistor-divider designs. |
| 4 (GND) | Analog ground reference | Return path for feedback, error amp, and internal references; must be low-impedance connection to PCB ground plane. |
| 5 (PGATE) | P-channel MOSFET gate driver | Swings 0V to VIN; 1A peak drive supports fast turn-on/turn-off of low-RDS(ON) P-MOSFETs. |
| 6 (VIN) | Power input and current sense reference | Supplies internal circuitry and provides current-sense reference for SW-to-VIN differential measurement. |
| 7 (SW) | Switch node | Connects to MOSFET drain and inductor; carries high di/dt switching waveform - requires tight layout and Kelvin sensing. |
| 8 (NC) | No connect | Unbonded pin - must remain unconnected; no routing or copper fill required. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE™ architecture | Eliminates external current-sense resistor - improves efficiency by up to 3%, saves >2mm² board area, removes associated parasitic inductance. |
| Constant-frequency pulse skipping | Maintains 550kHz operation down to light loads while reducing quiescent current to 200µA - ensures low output ripple and minimal EMI at all load levels. |
| 100% duty cycle dropout | Enables VOUT regulation even when VIN drops to within ~100mV of VOUT - maximizes usable battery capacity in Li-ion systems. |
| Low-profile SOT-23-8 package | 1mm height, industry-standard footprint - compatible with automated assembly and reflow, supports high-density portable PCB layouts. |
| Integrated OVP and short-circuit foldback | Shuts off PGATE if VFB exceeds 0.88V (40mV hysteresis); reduces oscillator frequency to 200kHz during short - protects load and MOSFET without external circuitry. |
Applications
| Wireless Sensor Node Power | Li-ion–Powered Portable Computer |
|---|---|
Use Scenario: Ultra-low-power IoT sensor node powered by 2-cell Li-ion (6.0–8.4V), requiring 3.3V/500mA for MCU and radio with <10µA sleep current. IC Role / Device Role / Timing Role: Primary step-down controller managing battery-to-3.3V conversion; regulates output during deep discharge (VIN down to 3.5V) using 100% duty cycle mode. Use Value: 8µA shutdown current extends shelf life; pulse-skipping light-load mode maintains >85% efficiency at 100µA load; No RSENSE™ eliminates resistor self-heating errors. |
Use Scenario: Main system rail in thin-client laptop, converting 7.4V dual-cell Li-ion to 1.8V core voltage for SoC with 2A peak demand. IC Role / Device Role / Timing Role: High-current buck controller driving low-RDS(ON) P-MOSFET; uses IPRG = GND (70mV threshold) to support 2A continuous output with minimal MOSFET heating. Use Value: 550kHz switching allows 2.2µH inductor and 22µF ceramic output cap; soft-start prevents CPU brownout during boot; UVLO prevents erratic behavior below 2.0V battery voltage. |
| Distributed Point-of-Load Converter | Industrial Handheld Meter |
Use Scenario: Secondary 5V-to-3.3V converter in industrial PLC module, fed from 5V backplane, powering isolated ADC and interface ICs. IC Role / Device Role / Timing Role: Local DC/DC controller providing clean, regulated 3.3V with low noise and fast transient response for precision analog circuits. Use Value: Current-mode control delivers <50µs load-step recovery; ±1.5% VREF ensures accurate ADC reference; low 200µA no-load current reduces thermal load in sealed enclosures. |
Use Scenario: Battery-backed power supply in handheld multimeter, operating from 2-cell Li-ion (2.75–8.4V) to generate stable 2.5V reference and 3.3V logic rail. IC Role / Device Role / Timing Role: Dual-output controller (using two LTC3772BETS8#TRPBF) delivering precision 2.5V (±0.5%) and 3.3V rails with independent enable control. Use Value: Independent ITH/RUN pins allow sequenced startup; 0.8V reference enables accurate 2.5V via 3.125kΩ/1kΩ divider; TSOT-23 footprint fits narrow PCB form factor. |
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 2A FET; 4.5–17V input; 500kHz; requires external current-sense resistor; no 100% duty cycle. | Better for higher-input-voltage industrial supplies; unsuitable for sub-3V Li-ion start-up or ultra-low-dropout operation. | Select only if integrated FET simplifies BOM and input >4.5V is guaranteed. |
| MAX17502ATP+T | 4.5–60V input; integrated 2.5A FET; 200–2.2MHz programmable frequency; requires RSENSE; no pulse-skipping light-load mode. | Targets wide-input industrial/motor drives; lacks micropower shutdown and battery-optimized UVLO. | Prefer for high-voltage, high-current applications where efficiency at full load outweighs light-load performance. |
Compared with TPS54202DRTT and MAX17502ATP+T, the LTC3772BETS8#TRPBF uniquely combines micropower operation (8µA shutdown), true 100% duty cycle, No RSENSE™ architecture, and Li-ion–optimized UVLO - making it irreplaceable for space- and battery-limited portable designs requiring high light-load efficiency and deep dropout capability.
Availability
LTC3772BETS8#TRPBF is available at Aetrix Electronics and suitable for wireless sensor nodes, portable computers, and industrial handheld meters requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC3772BETS8#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving aerospace, industrial, automotive, and communications markets.
The LTC3772BETS8#TRPBF belongs to Linear's No RSENSE™ controller family, engineered specifically for high-efficiency, low-component-count DC/DC conversion in battery-powered portable electronics where board space, thermal budget, and runtime are critical constraints.
FAQ
What is the maximum output current supported by the LTC3772BETS8#TRPBF?
The LTC3772BETS8#TRPBF does not define a fixed maximum output current-it depends on external components. With a typical 20mΩ P-MOSFET and IPRG = GND (70mV threshold), peak inductor current reaches ~3.5A, supporting ~2A continuous output after ripple subtraction. Actual capability is determined by MOSFET RDS(ON), inductor saturation current, thermal design, and PCB copper area. The LTC3772BETS8#TRPBF itself imposes no internal current limit beyond the IPRG-selected sense voltage.
Does the LTC3772BETS8#TRPBF require an external current-sense resistor?
No-the LTC3772BETS8#TRPBF uses No RSENSE™ architecture, measuring current by sensing the voltage drop across the external P-channel MOSFET's RDS(ON). This eliminates the need for a discrete current-sense resistor, reducing power loss, board area, and cost. The IPRG pin selects the effective sense threshold (70mV, 138mV, or 208mV), and slope compensation automatically adjusts for duty cycles above 20%. The LTC3772BETS8#TRPBF thus achieves high accuracy without added components.
Can the LTC3772BETS8#TRPBF operate with input voltage below 2.75V?
No-the absolute minimum operating input voltage for the LTC3772BETS8#TRPBF is 2.75V per datasheet specifications. Below this, regulation is not guaranteed. Its undervoltage lockout (UVLO) activates at ~2.0V (rising), but functional operation-including startup, regulation, and gate drive-requires VIN ≥ 2.75V. For sub-2.75V battery applications, consider the LTC3772BEDDB (same die, DFN package) or alternate controllers like the LTC3642, which supports 1.8V input.
How does the LTC3772BETS8#TRPBF achieve 100% duty cycle operation?
The LTC3772BETS8#TRPBF achieves 100% duty cycle by holding PGATE high continuously when VIN approaches VOUT-bypassing normal PWM switching. During dropout, the internal logic disables the oscillator and current comparator, allowing the external P-MOSFET to conduct DC. This maintains output regulation down to VIN − VOUT ≈ RDS(ON) × ILOAD, extending usable battery range. The LTC3772BETS8#TRPBF automatically transitions into and out of this mode based on load and input conditions without external intervention.
What is the purpose of the NC pin (Pin 8) on the LTC3772BETS8#TRPBF?
Pin 8 of the LTC3772BETS8#TRPBF is a no-connect (NC) terminal-unbonded internally and electrically isolated. It must remain unconnected on the PCB: no trace, no copper pour, no solder mask opening. Routing signals or placing copper near Pin 8 may cause parasitic coupling or mechanical stress. The NC designation is confirmed in the official datasheet pinout diagram and Absolute Maximum Ratings table; violating this risks latch-up or degraded ESD performance. The LTC3772BETS8#TRPBF functions identically whether Pin 8 is left floating or grounded, but grounding is not recommended.
LTC3772BETS8#TRPBF 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#TRPBF FAQ
1.How can I place an order for LTC3772BETS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3772BETS8#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 LTC3772BETS8#TRPBF reliable?
The price and inventory of LTC3772BETS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3772BETS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3772BETS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3772BETS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3772BETS8#TRPBF?
LTC3772BETS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3772BETS8#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 LTC3772BETS8#TRPBF?
For technical support, including LTC3772BETS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3772BETS8#TRPBF requirements.
6.How does Aetrix verify that LTC3772BETS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3772BETS8#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 LTC3772BETS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3772BETS8#TRPBF?
All LTC3772BETS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3772BETS8#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 LTC3772BETS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC3772BETS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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