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Analog Devices Inc. LTC1772IS6#TRMPBF
- Part No.:
- LTC1772IS6#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC1772IS6#TRMPBF.pdf
- Description:
- IC REG CTRLR MULT TOP SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:978
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Product details
Overview
LTC1772IS6#TRMPBF from Analog Devices (formerly Linear Technology) is a constant-frequency, current-mode step-down DC/DC controller in a 6-lead SOT-23 package, designed to drive an external P-channel MOSFET for high-efficiency buck conversion. It delivers ±2.5% output voltage accuracy, operates from 2.5V to 9.8V input, supports 550kHz switching, and enables 100% duty cycle dropout operation. It is used in lithium-ion-powered portable electronics requiring compact, low-quiescent-current regulation.
For engineers reviewing the LTC1772IS6#TRMPBF datasheet, LTC1772IS6#TRMPBF pinout, LTC1772IS6#TRMPBF application, or LTC1772IS6#TRMPBF equivalent, key selection criteria include its 0.8V reference voltage, Burst Mode™ operation for light-load efficiency, UVLO threshold of 2.00V (typ), shutdown current of 8µA, and compatibility with external P-MOSFETs for high-side switching in space-constrained battery systems.
Technical Context
The LTC1772IS6#TRMPBF implements a fixed-frequency current-mode control architecture with internal slope compensation above 40% duty cycle, enabling stable loop response across wide VIN/VOUT ratios. Its error amplifier drives the ITH/RUN pin to modulate peak inductor current via a voltage-controlled current comparator referenced to SENSE–.
It integrates undervoltage lockout (UVLO), overvoltage protection (OVP) with 20mV hysteresis, short-circuit foldback (reduced oscillator frequency to ~120kHz), and gate drive capable of sourcing/sinking 1A peak into 3000pF load with 40ns rise/fall times - all optimized for discrete P-MOSFET-based buck topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 9.8V - supports single/dual Li-ion, NiMH, and regulated 3.3V/5V rails without external LDO pre-regulation. |
| Switching Frequency | 550kHz (typ) - enables use of sub-5µH inductors and reduces output ripple without compromising EMI filtering complexity. |
| Reference Voltage | 0.800V (±2.5%) - sets precise output voltage via external resistor divider; allows 1.8V, 2.5V, or 3.3V outputs with standard 1% resistors. |
| Quiescent Current | 270µA (typ) - minimizes no-load power loss in always-on battery-powered systems such as modems or scanners. |
| Shutdown Current | 8µA (typ) - ensures ultra-low standby drain during host-sleep modes in portable computers and cellular handsets. |
| UVLO Threshold | 2.00V (typ, falling) - prevents erratic startup or MOSFET stress below safe Li-ion cell voltage (e.g., <2.0V/cell). |
| Peak Sense Voltage | 120mV - defines current limit threshold across RSENSE; enables accurate, temperature-stable overcurrent protection. |
Pinout & Package
The LTC1772IS6#TRMPBF is housed in a 6-lead plastic TSOT-23 package (JEDEC MO-193), measuring 2.90mm × 1.60mm × 0.95mm, with gull-wing leads and exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH/RUN (Pin 1) | Error amplifier output & shutdown control | Sets peak inductor current; pulling below 0.35V forces shutdown; internal 0.5µA current source enables soft-start when released. |
| GND (Pin 2) | Analog and power ground reference | Common return for feedback, sense, and gate drive return paths; must be low-impedance connection to minimize noise coupling. |
| VFB (Pin 3) | Feedback input to error amplifier | Compares divided output voltage against 0.8V reference; high-impedance node (≤50nA bias) requiring tight layout near output capacitor. |
| SENSE– (Pin 4) | Negative current sense input | Connects to low-side of external sense resistor; forms differential pair with VIN (sense+) for accurate current monitoring. |
| VIN (Pin 5) | Positive supply and sense+ input | Power input and high-side sense reference; requires local 0.1µF ceramic decoupling directly to GND (Pin 2). |
| PGATE (Pin 6) | P-channel MOSFET gate driver output | Swings from 0V to VIN; delivers 1A peak current with 40ns edges to drive gate capacitance of discrete P-MOSFETs like FDC638P or Si3443DV. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Enables >85% efficiency at 1mA load by disabling switching until ITH/RUN rises above 0.925V, reducing quiescent loss in idle states. |
| 100% duty cycle dropout | Maintains regulation down to VIN ≈ VOUT + VDS(ON) + IOUT×RSENSE, critical for Li-ion discharge curves where input drops to 2.5V–3.0V. |
| Current-mode control with slope compensation | Provides inherent line/load transient immunity and eliminates need for external compensation beyond ITH/RUN RC network. |
| Integrated OVP with hysteresis | Shuts off PGATE if VFB exceeds 0.860V (7.5% above 0.8V ref), then re-enables only after VFB falls below 0.840V - suppresses false trips from output overshoot. |
| Low-temperature UVLO drift | UVLO threshold varies only ±30mV from –40°C to 85°C (LTC1772I grade), ensuring reliable brown-out protection across industrial temperature range. |
Applications
| Cellular Telephones | Wireless Modems |
|---|---|
Use Scenario: Regulating 2.5V or 3.3V from a single Li-ion cell (2.7V–4.2V) for baseband processor and RF transceiver power domains. IC Role / Device Role / Timing Role: External P-MOSFET controller providing high-side buck conversion with fast load transient response and low-noise output. Use Value: Enables >92% efficiency at 500mA while maintaining <10mV output deviation during GSM burst transmission current spikes. | Use Scenario: Generating 1.8V core voltage for LTE/Wi-Fi SoCs in compact M.2 or mini-PCIe modem modules. IC Role / Device Role / Timing Role: Constant-frequency current-mode controller driving discrete P-MOSFET to achieve tight output regulation under dynamic data throughput loads. Use Value: Delivers ±1.5% output stability over –40°C to +85°C with 270µA quiescent current, extending battery runtime in always-connected IoT gateways. |
| Portable Computers | Scanners |
Use Scenario: Supplying 3.3V peripheral rail from main battery in ultrabooks and 2-in-1 detachables with aggressive thermal constraints. IC Role / Device Role / Timing Role: Step-down controller supporting 100% duty cycle to sustain output as battery discharges below 3.3V. Use Value: Maintains uninterrupted operation down to 2.8V input with <5mV line regulation, eliminating need for auxiliary boost converters. | Use Scenario: Powering CCD/CMOS image sensor and analog front-end in handheld barcode or document scanners. IC Role / Device Role / Timing Role: High-efficiency buck controller delivering low-noise 2.5V/1.8V rails with minimal EMI impact on sensitive analog signal chains. Use Value: Achieves <15mVpp output ripple at full load using ceramic output capacitors, preventing image noise or ADC quantization errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1622CGN#PBF | 8-lead MSOP; supports N-MOSFET drive; wider VIN (2V–10V); includes synchronization input; no integrated OVP. | Requires external N-MOSFET and bootstrap circuitry; better suited for higher-current (>2A) or synchronized multi-rail designs. | Select LTC1622CGN#PBF when needing N-MOSFET efficiency gains or clock synchronization; avoid if P-MOSFET simplicity and OVP are required. |
| TPS54202DRCT | Integrated N-MOSFETs (2A); 4.5V–18V VIN; 500kHz fixed freq; no 100% duty cycle; lower quiescent current (25µA). | Monolithic solution eliminates external FET but lacks dropout capability; unsuitable for Li-ion direct-to-core conversion below 3.3V. | Choose TPS54202DRCT for board area reduction and higher integration where input stays >4.5V; not a functional replacement for LTC1772IS6#TRMPBF in low-VIN battery apps. |
Compared with LTC1622CGN#PBF and TPS54202DRCT, the LTC1772IS6#TRMPBF uniquely combines P-MOSFET drive, 100% duty cycle, integrated OVP, and sub-3V operation in a 6-pin SOT-23 - making it irreplaceable for space- and voltage-constrained single-cell Li-ion systems requiring robust fault protection.
Availability
LTC1772IS6#TRMPBF is available at Aetrix Electronics and suitable for cellular telephones, wireless modems, and portable computers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC1772IS6#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 and maintains full product support, documentation, and manufacturing continuity for legacy Linear parts including the LTC1772 series.
The LTC1772IS6#TRMPBF belongs to Linear's precision DC/DC controller family, engineered specifically for high-efficiency, low-voltage, battery-powered portable applications where small size, low quiescent current, and robust fault protection are mandatory.
FAQ
What is the operating temperature range for the LTC1772IS6#TRMPBF?
The LTC1772IS6#TRMPBF is specified for operation from –40°C to +85°C and is guaranteed to meet all electrical specifications across this full industrial temperature range. This rating is confirmed in the Absolute Maximum Ratings table and Electrical Characteristics section of the official datasheet, distinguishing it from the commercial-grade LTC1772CS6 (0°C to 70°C) and high-temp LTC1772HS6 (–40°C to 140°C).
Does the LTC1772IS6#TRMPBF support 100% duty cycle operation, and how is it implemented?
Yes, the LTC1772IS6#TRMPBF supports 100% duty cycle operation to maintain regulation during input voltage dropout. When VIN approaches VOUT, the controller holds PGATE high continuously, allowing the external P-channel MOSFET to conduct DC current. This behavior is intrinsic to its current-mode architecture and does not require external circuitry - enabling seamless transition from switching to linear-like regulation as the battery discharges.
What is the function of the ITH/RUN pin on the LTC1772IS6#TRMPBF?
The ITH/RUN pin on the LTC1772IS6#TRMPBF serves dual roles: it is the output of the internal error amplifier (setting peak inductor current) and the primary enable/shutdown control input. Pulling ITH/RUN below 0.35V disables the controller and forces PGATE high; releasing it allows an internal 0.5µA current source to charge the external compensation network, enabling soft-start and controlled ramp-up of output current.
Can the LTC1772IS6#TRMPBF be used with an N-channel MOSFET instead of a P-channel MOSFET?
No, the LTC1772IS6#TRMPBF is designed exclusively for external P-channel MOSFETs. Its PGATE output swings from 0V to VIN, which is appropriate for high-side P-MOSFET gate drive but insufficient to fully enhance an N-MOSFET requiring gate voltage significantly above source potential. For N-MOSFET solutions, consider alternatives like the LTC1622 or LTC1778, which integrate bootstrap circuitry or support external gate drivers.
What is the typical efficiency of an LTC1772IS6#TRMPBF-based converter at 500mA output current?
A typical LTC1772IS6#TRMPBF-based 2.5V/500mA converter achieves ≥92% efficiency at VIN = 4.2V and ≥88% at VIN = 3.3V, as verified in Figure 1b of the datasheet. Efficiency remains >85% down to 10mA load due to Burst Mode™ operation, and peak efficiency reaches 94% under optimal conditions with low-RDS(ON) P-MOSFETs (e.g., FDC638P) and low-ESR ceramic output capacitors.
LTC1772IS6#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up, Step-Down, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck, Boost, Flyback
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 2.5V ~ 9.8V
- Frequency - Switching:
- 550kHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LTC1772IS6#TRMPBF FAQ
1.How can I place an order for LTC1772IS6#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1772IS6#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 LTC1772IS6#TRMPBF reliable?
The price and inventory of LTC1772IS6#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1772IS6#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC1772IS6#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1772IS6#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1772IS6#TRMPBF?
LTC1772IS6#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1772IS6#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 LTC1772IS6#TRMPBF?
For technical support, including LTC1772IS6#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1772IS6#TRMPBF requirements.
6.How does Aetrix verify that LTC1772IS6#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC1772IS6#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 LTC1772IS6#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC1772IS6#TRMPBF?
All LTC1772IS6#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1772IS6#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 LTC1772IS6#TRMPBF part is unused and in its original packaging.
Return procedure for LTC1772IS6#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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