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Analog Devices Inc. LTC1772CS6#TRMPBF
- Part No.:
- LTC1772CS6#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC1772CS6#TRMPBF.pdf
- Description:
- IC REG CTRLR MULT TOP SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:845
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Product details
Overview
LTC1772CS6#TRMPBF from Analog Devices (formerly Linear Technology) is a constant-frequency current-mode step-down DC/DC controller in SOT-23 packaging, designed to drive an external P-channel MOSFET for high-efficiency buck conversion. It delivers ±2.5% output voltage accuracy, 550kHz fixed switching frequency, Burst Mode® operation for light-load efficiency, and 100% duty-cycle dropout support - enabling stable 1.8V/2.5V/3.3V regulation from 2.5V–9.8V input in portable power systems.
For engineers reviewing the LTC1772CS6#TRMPBF datasheet, LTC1772CS6#TRMPBF pinout, LTC1772CS6#TRMPBF application, or LTC1772CS6#TRMPBF equivalent, key selection criteria include its 0.8V reference voltage, 270µA quiescent current, UVLO threshold of 2.0V (falling), 8µA shutdown current, and compatibility with low-threshold P-MOSFETs in space-constrained battery-powered designs.
Technical Context
The LTC1772CS6#TRMPBF implements current-mode control using a peak-current comparator referenced to the SENSE– pin, with error amplifier output on ITH/RUN controlling the current limit threshold. Its oscillator operates at a nominal 550kHz (500–650kHz over conditions), and includes dedicated circuitry for undervoltage lockout (UVLO), overvoltage protection (OVP at 0.82–0.895V on VFB), short-circuit foldback, and Burst Mode® sleep/wake hysteresis (0.85V/0.925V).
Dropout behavior is implemented via continuous PGATE high-state at 100% duty cycle when VIN approaches VOUT, while gate drive delivers 1A peak current with 40ns rise/fall times into 3000pF load - optimized for fast-switching P-MOSFETs like FDC638P or Si3443DV in compact layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 550kHz typical; enables use of small 4.7µH inductors and reduces output ripple filtering burden. |
| Reference Voltage | 0.800V ±2.5%; sets precise output voltage via external resistor divider (e.g., R1=80.6kΩ, R2=10kΩ for 2.5V). |
| Input Voltage Range | 2.5V to 9.8V; supports single/dual Li-ion, 3.3V distributed rails, and wide-input portable systems. |
| Quiescent Current | 270µA typical; minimizes standby power loss in always-on battery applications. |
| Shutdown Current | 8µA maximum; extends battery life during system sleep modes. |
| UVLO Threshold | 2.00V (falling); prevents erratic operation below safe MOSFET gate drive voltage. |
| Peak Sense Voltage | 120mV; defines current limit via external sense resistor (e.g., 0.03Ω for 2A max output). |
Pinout & Package
Package: 6-lead TSOT-23 (S6), 1.90mm × 2.90mm footprint, 0.95mm height, JEDEC MO-193 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH/RUN (Pin 1) | Error amplifier output & run control | Sets peak current limit; pulled low (<0.35V) disables regulator; internal 0.5µA charge source enables soft-start. |
| GND (Pin 2) | Power and signal ground reference | Return path for all internal circuits and external components; must be low-impedance connection to minimize noise coupling. |
| VFB (Pin 3) | Feedback input to error amplifier | Compares output voltage (via resistive divider) against 0.8V reference; 10–50nA input bias enables high-resistor-divider designs. |
| SENSE– (Pin 4) | Negative current-sense comparator input | Monitors voltage drop across external sense resistor; used with VIN (Pin 5) to detect inductor peak current. |
| VIN (Pin 5) | Positive supply input | Provides power to internal circuitry and gate driver; must be decoupled with ≥10µF ceramic capacitor close to pin. |
| PGATE (Pin 6) | P-channel MOSFET gate driver output | Swings 0V to VIN; delivers 1A peak current with 40ns edges to drive low-RDS(on) P-MOSFETs efficiently. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-frequency current-mode control | Ensures predictable EMI profile and stable transient response across line/load variations without slope compensation below 40% duty cycle. |
| Burst Mode® operation | Reduces quiescent current to ~230µA at light loads while maintaining regulated output, improving efficiency down to µA-level output currents. |
| 100% duty-cycle dropout | Enables seamless transition to linear regulation as VIN drops near VOUT, preserving output voltage without shutdown or restart glitches. |
| Integrated UVLO and OVP | UVLO (2.0V) prevents startup under weak battery conditions; OVP (7.5% above 0.8V) protects downstream circuitry from feedback-loop faults. |
| Low-impedance gate driver | 40ns rise/fall into 3000pF supports fast P-MOSFET switching, minimizing transition losses and enabling high-efficiency operation up to 94%. |
Applications
| Cellular Telephones | Wireless Modems |
|---|---|
Use Scenario: Power management in GSM/UMTS handsets requiring dual-voltage rails (3.3V logic, 2.5V RF, 1.8V core) from single Li-ion battery. IC Role / Device Role / Timing Role: Step-down DC/DC controller regulating 2.5V/1.8V outputs with Burst Mode® for standby efficiency and 100% duty cycle for low-VIN brownout resilience. Use Value: Extends talk time by >15% vs. LDO solutions at medium loads and maintains regulation during battery discharge from 4.2V to 3.0V. | Use Scenario: Compact 3G/4G data modems needing efficient 3.3V-to-2.5V conversion for baseband processors and RF transceivers. IC Role / Device Role / Timing Role: Constant-frequency buck controller driving P-MOSFET to deliver 2.5V @ 1.5A with <1% output ripple at 550kHz switching. Use Value: Enables use of 4.7µH shielded inductor and 10µF ceramic input cap - reducing board area by 40% vs. lower-frequency alternatives. |
| Portable Computers | Distributed 3.3V/2.5V Power Systems |
Use Scenario: Secondary voltage regulation in sub-notebooks and tablets where main PMIC supplies 5V/3.3V and local conversion to 1.8V is required. IC Role / Device Role / Timing Role: High-accuracy (±2.5%) current-mode controller supporting dynamic load steps up to 1A/µs with minimal output deviation. Use Value: Achieves <50mV output deviation during 1A load step due to fast current-loop bandwidth and integrated slope compensation. | Use Scenario: Point-of-load regulation in industrial IoT gateways distributing 3.3V/2.5V to multiple sensor nodes and microcontrollers from a shared 5V rail. IC Role / Device Role / Timing Role: Standalone buck controller providing isolated, low-noise 2.5V supply with independent enable/shutdown control per subsystem. Use Value: Enables selective subsystem power gating via ITH/RUN pin, reducing system-wide idle power by >300µW per channel. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1622CGN#PBF | 8-lead MSOP; supports sync-to-external clock (up to 750kHz); wider VIN range (2V–10V); higher max output current (4.5A). | Requires larger PCB area and external sync source; better suited for high-current, multi-phase, or synchronized systems. | Select LTC1622CGN#PBF when >2A output or clock synchronization is required; LTC1772CS6#TRMPBF remains optimal for ultra-compact, self-contained 0.5–2A designs. |
| TPS54202DRCT | Integrated N-MOSFET; 4.5–17V input; 2A output; 500kHz fixed frequency; no external sense resistor needed. | Eliminates external MOSFET but requires higher minimum input voltage; lacks 100% duty cycle and Burst Mode® efficiency at µA loads. | Choose TPS54202DRCT for simplified layout and higher VIN applications; LTC1772CS6#TRMPBF preferred where Li-ion input (2.5–4.2V) and ultra-low IQ are critical. |
Compared with LTC1622CGN#PBF and TPS54202DRCT, the LTC1772CS6#TRMPBF uniquely balances minimal footprint (SOT-23), lowest shutdown current (8µA), and true dropout capability - making it irreplaceable in space- and battery-life-constrained single-cell portable systems.
Availability
LTC1772CS6#TRMPBF is available at Aetrix Electronics and suitable for cellular telephones, wireless modems, and portable computers requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for LTC1772CS6#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 LTC1772CS6#TRMPBF belongs to Linear's precision DC/DC controller family, engineered specifically for high-efficiency, low-voltage, battery-powered applications where small size, low IQ, and robust dropout behavior are essential design requirements.
FAQ
What is the operating temperature range for the LTC1772CS6#TRMPBF?
The LTC1772CS6#TRMPBF is specified for commercial temperature operation from 0°C to 70°C. This rating is confirmed in the Absolute Maximum Ratings table and Electrical Characteristics section of the official datasheet, where parameters such as UVLO threshold and reference voltage are guaranteed across this range. The 'C' grade suffix explicitly denotes this temperature grade, distinct from 'E' (–40°C to 85°C) or 'H' (–40°C to 140°C) variants.
Can the LTC1772CS6#TRMPBF drive an N-channel MOSFET instead of a P-channel MOSFET?
No, the LTC1772CS6#TRMPBF is designed exclusively for external P-channel MOSFETs. Its PGATE pin drives from 0V to VIN, which is appropriate for high-side P-MOSFET gate control but cannot provide the gate-to-source voltage swing required for N-MOSFETs. Attempting to use an N-MOSFET would result in incomplete turn-on and excessive conduction losses. The functional diagram and Applications Information section explicitly specify P-channel topology and list compatible devices like FDC638P and Si3443DV.
What is the minimum output voltage achievable with the LTC1772CS6#TRMPBF?
The LTC1772CS6#TRMPBF supports output voltages down to 0.8V, set by its internal 0.8V reference voltage. Using the formula VOUT = 0.8V × (1 + R1/R2), selecting R2 = 0Ω (direct connection of VFB to ground) yields the theoretical minimum. In practice, stable regulation at 0.8V requires careful layout and low-ESR output capacitors, as confirmed in Figure 4 (Setting Output Voltage) and the "0.8V Reference Allows Low Output Voltages" feature list.
Does the LTC1772CS6#TRMPBF require an external compensation network?
Yes, the LTC1772CS6#TRMPBF requires external compensation on the ITH/RUN pin (Pin 1). This pin serves as the error amplifier output and compensation node; the datasheet Applications Information section specifies standard Type II compensation using a series RC network (e.g., RITH = 100kΩ, CITH = 1nF) between ITH/RUN and GND. Omitting or mis-sizing this network causes instability, poor transient response, or oscillation - as detailed in the Functional Diagram and PC Board Layout Checklist.
How does Burst Mode® operation improve efficiency at light loads in the LTC1772CS6#TRMPBF?
Burst Mode® operation in the LTC1772CS6#TRMPBF improves light-load efficiency by disabling the main switching loop when output current falls below a threshold, reducing quiescent current from 270µA to ~230µA. During bursts, the device delivers energy packets only as needed to maintain regulation, then enters sleep until VFB drops below 0.925V - eliminating continuous switching losses. This behavior is verified in the Typical Performance Characteristics (Figure 1b Efficiency vs Load Current) and explicitly described in the Burst Mode® Operation section.
LTC1772CS6#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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LTC1772CS6#TRMPBF FAQ
1.How can I place an order for LTC1772CS6#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1772CS6#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 LTC1772CS6#TRMPBF reliable?
The price and inventory of LTC1772CS6#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1772CS6#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC1772CS6#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1772CS6#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1772CS6#TRMPBF?
LTC1772CS6#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1772CS6#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 LTC1772CS6#TRMPBF?
For technical support, including LTC1772CS6#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1772CS6#TRMPBF requirements.
6.How does Aetrix verify that LTC1772CS6#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC1772CS6#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 LTC1772CS6#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC1772CS6#TRMPBF?
All LTC1772CS6#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1772CS6#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 LTC1772CS6#TRMPBF part is unused and in its original packaging.
Return procedure for LTC1772CS6#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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