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Analog Devices Inc. LTC1772BIS6#TRMPBF
- Part No.:
- LTC1772BIS6#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC1772BIS6#TRMPBF.pdf
- Description:
- IC REG CTRLR MULT TOP TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
LTC1772BIS6#TRMPBF from Analog Devices (formerly Linear Technology) is a constant-frequency, current-mode step-down DC/DC controller in a 6-lead TSOT-23 package, designed for battery-powered systems requiring high efficiency, low quiescent current (270 μA), ±2.5% output voltage accuracy, and stable regulation across 2.5 V to 9.8 V input. It drives an external P-channel MOSFET, supports 550 kHz switching, and enables 100% duty-cycle dropout operation.
For engineers reviewing the LTC1772BIS6#TRMPBF datasheet, LTC1772BIS6#TRMPBF pinout, LTC1772BIS6#TRMPBF application, or LTC1772BIS6#TRMPBF equivalent, key selection considerations include its non-Burst Mode operation (lower light-load ripple), undervoltage lockout at 2.0 V, 0.8 V feedback reference, 105 mV current-sense threshold, and compatibility with lithium-ion, portable computing, and distributed 3.3 V/2.5 V power rails.
Technical Context
The LTC1772BIS6#TRMPBF implements a fixed-frequency (550 kHz) current-mode control architecture with slope compensation active above 40% duty cycle, enabling stable operation with small inductors and predictable transient response. Its error amplifier output (ITH/RUN pin) directly sets peak inductor current, while the internal 0.8 V reference and VFB input enable precise output voltage regulation via external resistor dividers.
It integrates undervoltage lockout (UVLO) with 2.0 V falling threshold, overvoltage protection (OVP) triggered at 7.5% above VREF with 20 mV hysteresis, and short-circuit foldback that reduces oscillator frequency to ~120 kHz. Shutdown draws only 8 μA, and PGATE provides rail-to-rail drive (0 V to VIN) for logic-level P-MOSFETs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Frequency | 550 kHz typical - enables compact 4.7 μH inductors and low-output-ripple designs without frequency modulation. |
| Input Voltage Range | 2.5 V to 9.8 V - supports single/dual Li-ion, NiMH, and wide-input portable systems. |
| Feedback Reference Voltage | 0.800 V ±2.5% - sets output voltage via R1/R2 divider; enables 0.8 V minimum VOUT with high accuracy. |
| Quiescent Current | 270 μA typical - minimizes battery drain in always-on or standby modes. |
| UVLO Threshold | 2.00 V (falling) - prevents unstable operation during brownout; device shuts down cleanly below this level. |
| Peak Current Sense Threshold | 105 mV - determines maximum inductor current; scales linearly with RSENSE for precise current limiting. |
| Shutdown Current | 8 μA - ensures ultra-low system leakage when disabled via ITH/RUN pin. |
Pinout & Package
Package: 6-lead plastic TSOT-23 (S6), 1.90 mm × 2.80 mm footprint, 0.95 mm height, rated for –40°C to +85°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH/RUN (Pin 1) | Error amplifier output & shutdown control | Drives external compensation network; pulling below 0.35 V disables regulator and holds PGATE high. |
| GND (Pin 2) | Power and signal reference ground | Common return path for VIN decoupling, sense resistor, and feedback divider; must be low-impedance. |
| VFB (Pin 3) | Feedback input | Compares divided output voltage against 0.8 V reference; regulates VOUT with ±2.5% accuracy. |
| SENSE– (Pin 4) | Negative current-sense input | Monitors voltage drop across external RSENSE; used with VIN (SENSE+) to detect peak inductor current. |
| VIN (Pin 5) | Main power supply input | Supplies internal circuitry and PGATE driver; requires local 0.1 μF ceramic decoupling to GND. |
| PGATE (Pin 6) | P-channel MOSFET gate driver | Swings from 0 V to VIN; delivers >1 A peak current for fast turn-on/turn-off of external P-MOSFET. |
Key Features
| Feature | Design Value |
|---|---|
| Non-Burst Mode operation | Eliminates low-frequency switching artifacts; maintains constant 550 kHz frequency even at 5% load, reducing EMI filtering burden. |
| 100% duty-cycle dropout | Enables seamless transition to linear regulation as VIN approaches VOUT, preserving output voltage without shutdown. |
| Accurate 0.8 V reference | Supports tight output tolerance (±2.5%) across temperature; enables stable 1.8 V, 2.5 V, and 3.3 V rails with standard resistor values. |
| Low 8 μA shutdown current | Extends battery life in sleep modes; compatible with host-controlled power sequencing in portable devices. |
| Integrated OVP and UVLO | Protects downstream circuitry from overvoltage transients (>7.5% above VREF) and unsafe low-VIN conditions (<2.0 V). |
Applications
| Cellular Telephones | Portable Computers |
|---|---|
Use Scenario: Regulating 3.3 V or 2.5 V core logic rails from a single Li-ion cell (2.8–4.2 V). IC Role / Device Role / Timing Role: Primary step-down controller managing power delivery to baseband processor and memory interfaces. Use Value: Delivers up to 2 A output with 94% peak efficiency and <20 mVP-P ripple at light loads-critical for RF noise-sensitive receivers. |
Use Scenario: Generating 1.8 V or 2.5 V for USB controllers, display drivers, or SSD power management in ultrabooks. IC Role / Device Role / Timing Role: High-density, low-profile DC/DC controller replacing larger SO-8 solutions in space-constrained mainboards. Use Value: TSOT-23 package saves >60% board area vs. MSOP-8 alternatives; 550 kHz switching allows 10 μH inductors under 2 mm height. |
| Distributed Power Systems | Lithium-Ion Powered Devices |
Use Scenario: Local point-of-load conversion in multi-rail embedded systems (e.g., 5 V → 3.3 V for FPGA I/O banks). IC Role / Device Role / Timing Role: Standalone controller providing isolated, regulated secondary rails without requiring complex PMIC integration. Use Value: Wide 2.5–9.8 V input range accommodates upstream buck or boost converters; ±2.5% VOUT accuracy ensures reliable interface timing margins. |
Use Scenario: Powering handheld medical monitors, barcode scanners, or wireless sensors operating from 1–2 Li-ion cells. IC Role / Device Role / Timing Role: Primary battery discharge regulator maintaining stable output during deep discharge (down to VIN = 2.5 V). Use Value: 270 μA quiescent current and 8 μA shutdown minimize self-discharge; 100% duty cycle sustains output until battery reaches 2.0 V UVLO cutoff. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1772ES6#TRPBF | Burst Mode enabled; 60 mVP-P output ripple at 100 mA vs. 20 mVP-P for LTC1772BIS6#TRMPBF; higher light-load efficiency but introduces low-frequency noise. | Better suited for battery-life-critical applications where ripple is less sensitive (e.g., analog sensor biasing), not RF or audio paths. | Select LTC1772ES6#TRPBF if maximizing runtime at microamp loads outweighs EMI concerns; LTC1772BIS6#TRMPBF preferred for noise-sensitive digital loads. |
| LTC1622CGN#PBF | 8-lead MSOP; wider VIN (2 V–10 V); supports sync-to-external clock; 4.5 A max output; includes soft-start and thermal shutdown. | Targets higher-current, industrial-grade applications requiring robustness and synchronization-not direct drop-in due to package and pin count. | Choose LTC1622CGN#PBF for >2 A loads or systems needing clock synchronization; LTC1772BIS6#TRMPBF remains optimal for sub-2 A, space-constrained, low-noise designs. |
Compared with LTC1772ES6#TRPBF, the LTC1772BIS6#TRMPBF trades light-load efficiency for superior ripple performance and EMI control; versus LTC1622CGN#PBF, it offers half the footprint and lower BOM cost at the expense of current capability and feature set-making it ideal for compact, noise-aware consumer electronics.
Availability
LTC1772BIS6#TRMPBF is available at Aetrix Electronics and suitable for cellular telephones, portable computers, and distributed 3.3 V/2.5 V power systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1772BIS6#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 technical and manufacturing continuity for legacy Linear power products.
The LTC1772BIS6#TRMPBF belongs to Linear's precision current-mode DC/DC controller family, engineered specifically for high-efficiency, low-noise, battery-operated portable electronics with stringent size and quiescent current requirements.
FAQ
What is the primary function of the LTC1772BIS6#TRMPBF in a power supply design?
The LTC1772BIS6#TRMPBF serves as a constant-frequency, current-mode step-down DC/DC controller that regulates output voltage by driving an external P-channel MOSFET. It provides precise feedback control via a 0.8 V reference, supports 550 kHz switching for compact magnetics, and features 100% duty-cycle dropout-making it ideal for Li-ion-powered portable devices. The LTC1772BIS6#TRMPBF does not integrate power switches and requires external components for full converter implementation.
How does the LTC1772BIS6#TRMPBF differ from the Burst Mode version LTC1772?
The LTC1772BIS6#TRMPBF disables Burst Mode operation to maintain constant 550 kHz switching across all load conditions, resulting in significantly lower output voltage ripple (e.g., 20 mVP-P vs. 60 mVP-P at 100 mA) and reduced low-frequency EMI. In contrast, the LTC1772 enables Burst Mode to improve light-load efficiency at the expense of variable-frequency operation and higher ripple. The LTC1772BIS6#TRMPBF is selected when spectral purity and predictable noise behavior are prioritized over marginal battery runtime gains.
What is the recommended minimum RSENSE value for a 2 A output application using the LTC1772BIS6#TRMPBF?
For a 2 A output with typical 40% ripple current (IRIPPLE = 0.8 A), the LTC1772BIS6#TRMPBF requires RSENSE ≈ 0.0875 Ω per the formula RSENSE = 0.0875 / IOUT for duty cycles <40%. At higher duty cycles, slope compensation reduces effective peak current, so RSENSE must be scaled using Figure 3 from the datasheet. A common choice is 0.03 Ω, yielding ~105 mV sense voltage at 3.5 A peak-providing margin for transient loads while staying within the LTC1772BIS6#TRMPBF's 105 mV threshold specification.
Can the LTC1772BIS6#TRMPBF operate with input voltages below 2.5 V?
No-the LTC1772BIS6#TRMPBF has a guaranteed operating input range of 2.5 V to 9.8 V per datasheet specifications. Although undervoltage lockout triggers at 2.0 V, the device is not characterized or specified for functional operation below 2.5 V. Attempting to operate below this limit may result in degraded regulation, increased quiescent current, or failure to start. For sub-2.5 V applications, consider the LTC1771 (2.8 V min) or LTC1622 (2.0 V min), both of which are validated for lower VIN operation.
What package type and lead finish does the LTC1772BIS6#TRMPBF use?
The LTC1772BIS6#TRMPBF uses the 6-lead plastic TSOT-23 (S6) package with lead-free (Pb-free) matte tin finish, compliant with JEDEC MO-193. The "#TRMPBF" suffix indicates tape-and-reel packaging with lead-free termination. Its dimensions are 1.90 mm × 2.80 mm × 0.95 mm, optimized for high-density PCB layouts in portable electronics. The part is rated for –40°C to +85°C ambient operation and features 230°C/W junction-to-ambient thermal resistance.
LTC1772BIS6#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
LTC1772BIS6#TRMPBF FAQ
1.How can I place an order for LTC1772BIS6#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1772BIS6#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 LTC1772BIS6#TRMPBF reliable?
The price and inventory of LTC1772BIS6#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1772BIS6#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC1772BIS6#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1772BIS6#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1772BIS6#TRMPBF?
LTC1772BIS6#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1772BIS6#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 LTC1772BIS6#TRMPBF?
For technical support, including LTC1772BIS6#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1772BIS6#TRMPBF requirements.
6.How does Aetrix verify that LTC1772BIS6#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC1772BIS6#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 LTC1772BIS6#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC1772BIS6#TRMPBF?
All LTC1772BIS6#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1772BIS6#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 LTC1772BIS6#TRMPBF part is unused and in its original packaging.
Return procedure for LTC1772BIS6#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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