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Analog Devices Inc. LTC1773EMS#TRPBF
- Part No.:
- LTC1773EMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1773EMS#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,284
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Product details
Overview
LTC1773EMS#TRPBF from Analog Devices (formerly Linear Technology) is a current-mode synchronous buck DC/DC controller IC that drives external complementary P-channel and N-channel MOSFETs. It operates from 2.65V to 8.5V input, delivers adjustable output from 0.8V to VIN, and achieves up to 95% efficiency in portable lithium-ion battery-powered systems such as notebook computers and RF power amplifier supplies.
For engineers reviewing the LTC1773EMS#TRPBF datasheet, LTC1773EMS#TRPBF pinout, LTC1773EMS#TRPBF application, or LTC1773EMS#TRPBF equivalent, key selection considerations include its 550kHz fixed-frequency operation, OPTI-LOOP® compensation for minimal output capacitance, selectable Burst Mode® for ultra-low quiescent current (80µA), 100% duty cycle dropout capability, and precise ±1.5% reference accuracy with 2.5V undervoltage lockout.
Technical Context
The LTC1773EMS#TRPBF implements a constant-frequency current-mode control architecture with internal 550kHz oscillator, peak-current sensing via external RSENSE, and error amplifier output on ITH pin to modulate peak inductor current. Its dual-gate drivers (TG for P-MOSFET, BG for N-MOSFET) support synchronous rectification, eliminating Schottky diode requirements.
It features multifunction SYNC/FCB pin enabling secondary winding regulation, external clock synchronization (585–750kHz), and Burst Mode®/forced continuous mode selection. The RUN/SS pin integrates soft-start timing (0.8s/µF) and shutdown control (<0.4V), while VFB maintains regulation at 0.80V ±1.5% over temperature and line.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Synchronous buck controller - requires external P- and N-channel MOSFETs; enables high-efficiency step-down conversion without external diode. |
| Input Voltage Range | 2.65V to 8.5V - supports single- or dual-cell Li-ion battery operation with stable regulation down to near-end-of-discharge voltage. |
| Output Voltage Range | 0.8V to VIN - adjustable via resistive divider on VFB; 0.80V ±1.5% internal reference ensures tight output tolerance. |
| Switching Frequency | 550kHz (typ), synchronizable to 585–750kHz - enables compact magnetics and low-profile inductor selection (e.g., 3µH Sumida CDRH6D28). |
| Quiescent Current | 80µA in Burst Mode®, 10µA in shutdown - extends battery runtime in standby and light-load conditions. |
| Duty Cycle Capability | 100% - supports low-dropout operation when VIN approaches VOUT, maintaining regulation during battery voltage sag. |
| Package | 10-Lead MSOP - surface-mount package with exposed pad option; thermal resistance θJA = 120°C/W enables operation up to +85°C ambient. |
Pinout & Package
Package: 10-Lead Plastic MSOP (3mm × 3mm), RoHS-compliant, lead-free (#PBF suffix), tape-and-reel (#TRPBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH (1) | Error amplifier output / current limit control | Modulates peak inductor current; voltage range 0–1.2V (up to 2.4V near current limit); sets current comparator threshold. |
| RUN/SS (2) | Soft-start timing & enable/shutdown control | Internal 1.5µA current source charges external capacitor; <0.4V forces shutdown (IQ <10µA); 0.7V threshold initiates regulation. |
| SYNC/FCB (3) | Multifunction: sync input / FCB feedback / Burst Mode select | Accepts TTL/CMOS clock (585–750kHz); regulates auxiliary winding when used as feedback; floating or high = Burst Mode®, grounded = forced continuous. |
| VFB (4) | Feedback input | Compares resistive-divider output against 0.80V reference; max feedforward capacitance 0.01µF to avoid instability. |
| GND (5) | Analog/digital ground reference | Common return for all internal circuitry; must be low-impedance connection to system ground plane. |
| BG (6) | Bottom gate driver output | Drives N-channel MOSFET source; swings 0V to VIN; optimized for fast rise/fall (80/45ns typ into 3000pF). |
| TG (7) | Top gate driver output | Drives P-channel MOSFET source; swings 0V to VIN; rise/fall times 45/48ns typ into 3000pF. |
| VIN (8) | Main supply input | Power for internal circuitry and gate drivers; requires local 68µF low-ESR ceramic or polymer capacitor. |
| SENSE– (9) | Negative current sense input | Connects to source of P-MOSFET; senses voltage across external RSENSE; maximum threshold 100mV. |
| SW (10) | Switch node | Connects to inductor and drains of both MOSFETs; carries high dv/dt switching waveform; requires short, low-inductance PCB trace. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Minimizes required output capacitance by optimizing phase margin across wide ESR/COUT combinations - reduces BOM count and board area vs traditional Type-II/III compensation. |
| Burst Mode® Operation | Reduces quiescent current to 80µA at light loads while maintaining regulation - eliminates need for external enable sequencing in battery-powered sleep modes. |
| Secondary Winding Regulation | SYNC/FCB pin acts as auxiliary feedback input for flyback-derived rails - enables single-controller multi-output designs without optocouplers or additional controllers. |
| 100% Duty Cycle Dropout | Extends usable battery life by sustaining output regulation even when VIN drops within ~100mV of VOUT - critical for Li-ion discharge curve tracking. |
| Precision UVLO | 2.5V ±150mV undervoltage lockout with 150mV hysteresis - prevents deep discharge damage to single-cell Li-ion batteries and ensures clean startup. |
Applications
| Cellular Telephones | RF PA Supplies |
|---|---|
Use Scenario: Powering baseband processor and transceiver ICs in 3G/4G smartphones with dynamic load profiles from idle to transmit burst. IC Role / Device Role / Timing Role: Synchronous buck controller regulating core voltage (1.2V) and I/O rail (2.8V) from single Li-ion cell (3.0–4.2V). Use Value: Burst Mode® maintains <80µA IQ during standby; 95% peak efficiency minimizes thermal load in sealed handset enclosures. | Use Scenario: Supplying bias voltage to power amplifier stages in cellular infrastructure and mobile handsets. IC Role / Device Role / Timing Role: High-efficiency step-down controller delivering 2.5V/3A to GaAs/GaN PA modules with fast transient response. Use Value: Current-mode architecture provides excellent load transient suppression (<20mV dip on 1A step); 550kHz frequency avoids interference with RF bands. |
| Notebook Computers | Wireless MODEMs |
Use Scenario: Generating CPU core voltage (0.8–1.3V) and memory I/O (1.5V/1.8V) from 3-cell Li-ion battery pack (9–12.6V). IC Role / Device Role / Timing Role: Primary buck controller driving external MOSFETs in multiphase or single-phase configuration for high-current rails. Use Value: 100% duty cycle operation sustains regulation during battery sag below 10V; OPTI-LOOP® allows use of low-ESR polymer capacitors only. | Use Scenario: Powering LTE/Wi-Fi modem SoCs in portable hotspots and embedded M2M devices. IC Role / Device Role / Timing Role: Compact synchronous controller supplying 1.2V core and 3.3V analog rails from 2-cell Li-ion (6–8.4V). Use Value: MSOP-10 footprint saves space vs integrated DC/DC; SYNC/FCB enables auxiliary 5V USB charging rail regulation from same controller. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3850EMS#TRPBF | Higher VIN range (4–36V), 600kHz fixed frequency, no Burst Mode®, supports external VREF | Designed for industrial/high-VIN applications; lacks low-IQ light-load optimization for battery use | Select when input exceeds 8.5V or when precise external reference is required; not suitable for sub-3V startup. |
| TPS40200DGQ | Adjustable frequency (100kHz–1MHz), no integrated gate drivers, requires external bootstrap circuitry, higher IQ (200µA) | General-purpose controller with wider frequency tuning but less integration and lower light-load efficiency | Choose for cost-sensitive non-battery applications where layout flexibility outweighs efficiency and size constraints. |
Compared with LTC3850EMS#TRPBF and TPS40200DGQ, the LTC1773EMS#TRPBF uniquely combines 2.65V startup, 80µA Burst Mode® IQ, 100% duty cycle, and integrated dual gate drivers in a 10-pin MSOP - making it the only option optimized for compact, long-runtime Li-ion portable systems requiring sub-3V operation and minimal external components.
Availability
LTC1773EMS#TRPBF is available at Aetrix Electronics and suitable for notebook computers, RF power amplifier supplies, and portable instrumentation requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LTC1773EMS#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, Inc. (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 LTC1773EMS#TRPBF belongs to Linear's legacy high-efficiency DC/DC controller product line, specifically engineered for battery-powered portable electronics demanding ultra-low quiescent current, wide input range, and minimal external component count.
FAQ
What is the minimum input voltage required for the LTC1773EMS#TRPBF to start switching?
The LTC1773EMS#TRPBF has a precision undervoltage lockout (UVLO) with turn-on threshold of 2.65V (typ) and hysteresis of 150mV. It begins switching only when VIN ramps above 2.65V; operation ceases below 2.5V. This ensures compatibility with single-cell Li-ion batteries down to end-of-discharge voltage while preventing deep discharge damage. The LTC1773EMS#TRPBF is specified to operate continuously from 2.65V to 8.5V.
Can the LTC1773EMS#TRPBF drive N-channel MOSFETs for both high-side and low-side switches?
No - the LTC1773EMS#TRPBF is designed specifically for complementary P-channel high-side and N-channel low-side MOSFET configurations. Its TG driver is optimized for P-MOSFET source-follower operation (0V to VIN swing), and lacks bootstrap or charge-pump circuitry required for N-channel high-side drive. Using an N-channel high-side MOSFET would require external gate-drive complexity incompatible with the LTC1773EMS#TRPBF's architecture.
How does the SYNC/FCB pin enable secondary winding regulation in flyback topologies?
When configured as feedback input, the SYNC/FCB pin monitors a resistive divider from an auxiliary winding. If its voltage falls below 0.8V, the LTC1773EMS#TRPBF forces continuous conduction mode on the main switch to maintain regulation on the auxiliary output - independent of main output loading. This eliminates need for optocouplers or separate controllers. The LTC1773EMS#TRPBF uses this function without requiring changes to its primary buck control loop.
What is the purpose of the ITH pin on the LTC1773EMS#TRPBF, and how is it used in compensation?
The ITH pin is the error amplifier output and serves as the current limit control node. In OPTI-LOOP® compensation, external RC networks connect between ITH and GND or VFB to shape loop gain and phase margin - allowing stable operation with diverse output capacitor types (ceramic, polymer, tantalum) and ESR values. Unlike conventional compensation, OPTI-LOOP® decouples stability from COUT ESR, enabling smaller, lower-ESR capacitors. The LTC1773EMS#TRPBF's ITH pin directly interfaces with the current comparator to set peak inductor current.
Does the LTC1773EMS#TRPBF support forced continuous conduction mode (FCCM), and how is it enabled?
Yes - forced continuous conduction mode is enabled by pulling the SYNC/FCB pin to GND. This overrides Burst Mode® operation and guarantees uninterrupted switching regardless of load current, eliminating low-frequency output ripple and EMI associated with pulse-skipping. FCCM is essential for noise-sensitive applications like RF circuits and high-speed data converters. The LTC1773EMS#TRPBF maintains full current-mode control and transient response in FCCM, with no change to gate drive timing or protection features.
LTC1773EMS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- 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):
- 2.65V ~ 8.5V
- Frequency - Switching:
- 550kHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Soft Start
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LTC1773EMS#TRPBF FAQ
1.How can I place an order for LTC1773EMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1773EMS#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 LTC1773EMS#TRPBF reliable?
The price and inventory of LTC1773EMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1773EMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1773EMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1773EMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1773EMS#TRPBF?
LTC1773EMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1773EMS#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 LTC1773EMS#TRPBF?
For technical support, including LTC1773EMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1773EMS#TRPBF requirements.
6.How does Aetrix verify that LTC1773EMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1773EMS#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 LTC1773EMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1773EMS#TRPBF?
All LTC1773EMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1773EMS#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 LTC1773EMS#TRPBF part is unused and in its original packaging.
Return procedure for LTC1773EMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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