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Analog Devices Inc. LTC1628CG#TRPBF
- Part No.:
- LTC1628CG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1628CG#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:369
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Product details
Overview
LTC1628CG#TRPBF from Analog Devices (formerly Linear Technology) is a dual-phase, synchronous step-down switching regulator controller driving two independent N-channel MOSFET stages for 5V/3.3V power rails. It delivers ±1% output voltage accuracy, supports 3.5V–36V input, operates up to 300kHz with out-of-phase timing, and integrates OPTI-LOOP® compensation for stable transient response across wide output capacitance ranges - used in notebook computers and battery-powered digital systems.
For engineers reviewing the LTC1628CG#TRPBF datasheet, LTC1628CG#TRPBF pinout, LTC1628CG#TRPBF application, or LTC1628CG#TRPBF equivalent, key selection considerations include its dual-channel current-mode architecture, 28-pin SSOP package, PGOOD omission (vs. LTC1628CG-PG#TRPBF), soft-start control via RUN/SS pins, and compatibility with external 0.01Ω sense resistors for foldback current limiting.
Technical Context
The LTC1628CG#TRPBF implements a constant-frequency, current-mode control architecture with two channels operating 180° out of phase to reduce input ripple current and EMI. Each channel uses an internal 0.8V precision reference, transconductance error amplifier (gm = 1.3 mmho, GBW = 3 MHz), and ITH-controlled peak-current sensing with adjustable soft-start via external capacitor on RUN/SS pins.
It features dual independent gate drivers (TG1/BG1 and TG2/BG2) supporting synchronous rectification, integrated 5V/3.3V standby LDOs, EXTVCC switchover at 4.7V, and programmable oscillator frequency (140–310 kHz via FREQSET). The absence of FLTCPL and PGOOD pins distinguishes it from the PG variant, confirming standalone per-channel fault handling and no power-good monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports 12V/24V industrial rails and all common battery chemistries including Li-ion, lead-acid, and NiMH. |
| Output Voltage Accuracy | ±1% over line/load/temperature - ensures reliable microprocessor core and I/O rail regulation without external trimming. |
| Switching Frequency | 140 kHz to 310 kHz (adjustable via FREQSET) - enables optimization of inductor size vs. efficiency and EMI performance. |
| Duty Cycle Max | 99.4% - allows ultra-low dropout operation near VIN ≈ VOUT, critical for high-efficiency battery discharge phases. |
| Current Sense Threshold | 62–88 mV (at VOSENSE = 0.7V) - sets precise overcurrent trip point with 0.01Ω RSENSE, enabling accurate foldback limiting. |
| Shutdown Quiescent Current | 20 µA - minimizes battery drain during system sleep modes in portable instrumentation. |
| Operating Temperature | 0°C to +85°C - qualified for commercial-grade embedded applications including notebooks and PDAs. |
Pinout & Package
Package: 28-lead plastic SSOP (G package), 5.6mm × 10.2mm body, 0.635mm pitch, exposed pad not present (unlike QFN UH variant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS1, RUN/SS2 | Soft-start & shutdown control inputs | Capacitor-to-ground sets ramp time; <1.0V forces shutdown; >4.5V arms latchoff for short-circuit protection. |
| SENSE1+/SENSE1−, SENSE2+/SENSE2− | Differential current sense inputs | Measure voltage drop across external RSENSE to regulate peak inductor current per channel. |
| VOSENSE1, VOSENSE2 | Remote feedback inputs | Accept resistor-divider output voltage for precision regulation; referenced to internal 0.8V bandgap. |
| TG1, TG2, BG1, BG2 | High-current gate drivers | TG drives top N-MOSFETs (floating); BG drives bottom N-MOSFETs (ground-referenced); each rated for 3A peak. |
| VIN, PGND, SGND | Main supply, power ground, signal ground | VIN powers INTVCC LDO; PGND connects to MOSFET sources/Schottky cathodes; SGND is isolated analog reference plane. |
| INTVCC, EXTVCC | Internal/external VCC supply | INTVCC = 5.0V ±2% regulated output; EXTVCC >4.7V bypasses LDO for higher efficiency in self-biased configurations. |
| FREQSET, FCB, STBYMD | Oscillator control, mode select, standby control | FREQSET adjusts frequency; FCB selects Burst/Continuous mode; STBYMD enables 5V/3.3V standby regulators independently. |
| ITH1, ITH2 | Error amplifier outputs | Control current comparator threshold; voltage ramp determines soft-start behavior and load transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual-channel operation | Reduces RMS input capacitor current by ~30% and cuts peak input ripple, enabling smaller, lower-cost bulk capacitors. |
| OPTI-LOOP® compensation | Allows stable loop response with ceramic or polymer output caps from 10µF to 1000µF without external compensation components. |
| Adjustable soft-start with timed short-circuit shutdown | Single capacitor per channel sets both startup ramp time and short-circuit timeout - simplifies BOM and layout. |
| Dual independent 5V/3.3V standby LDOs | Delivers 10mA continuous / 50mA peak to support always-on logic, RTC, or wake-up circuitry without external regulators. |
| Programmable burst/continuous/fixed-frequency modes | FCB pin selects optimal light-load efficiency (Burst Mode) or low-noise fixed-frequency operation without changing hardware. |
Applications
| Notebook Computer Power Management | Battery-Powered Digital Instrumentation |
|---|---|
|
Use Scenario: Dual-rail power delivery for CPU core (5V) and I/O (3.3V) in space-constrained clamshell designs with thermal limits. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing independent current loops, out-of-phase switching to minimize input ripple and heat buildup. Use Value: Enables use of smaller input capacitors and reduces thermal stress on PCB, extending battery life and meeting EN55022 Class B EMI requirements. |
Use Scenario: Portable multimeter or handheld oscilloscope requiring stable 5V/3.3V rails from 7.2V Li-ion pack under varying load and temperature. IC Role / Device Role / Timing Role: Primary DC/DC controller with programmable frequency and Burst Mode for >85% efficiency at 10mA–5A loads. Use Value: Maintains ±1% regulation across battery discharge (8.4V→6.0V) while delivering 20µA shutdown current to maximize runtime. |
| Industrial DC Power Distribution | Automotive Infotainment Subsystem |
|
Use Scenario: Centralized 24V-to-5V/3.3V conversion feeding multiple sensor nodes and communication modules in factory automation. IC Role / Device Role / Timing Role: High-voltage input controller with 36V absolute max rating, remote sensing, and foldback current limiting for robust field operation. Use Value: Withstands load dumps and cold-crank transients; remote sense compensates for PCB trace IR drop across 15cm runs. |
Use Scenario: Powering display interface and audio codec in automotive head unit using 12V battery with wide input variation (6V–16V). IC Role / Device Role / Timing Role: Dual-output buck controller with UVLO (3.5V), overvoltage protection, and 125°C junction-rated operation. Use Value: Ensures clean power during cranking (6.5V) and prevents damage during load dump (up to 36V), meeting ISO 7637-2 Pulse 5a compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-phase synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1628CG-PG#TRPBF | Includes open-drain PGOOD output; replaces FLTCPL pin with PGOOD; identical pinout and electrical specs otherwise. | Required where system-level power sequencing or fault reporting to host MCU is needed (e.g., laptops with ACPI power management). | Select LTC1628CG-PG#TRPBF only if PGOOD monitoring is mandatory; LTC1628CG#TRPBF saves cost and board space when status signaling is handled externally. |
| MP2918GL-Z | Single-chip dual-phase controller with integrated MOSFET drivers but no 3.3V LDO; 40V max VIN; fixed 500kHz frequency; no FREQSET or FCB flexibility. | Suitable for compact, high-density designs where external MOSFETs are undesirable and fixed-frequency operation suffices. | Choose MP2918GL-Z for simplified layout and reduced component count; LTC1628CG#TRPBF offers superior flexibility in frequency tuning, light-load mode selection, and standby rail generation. |
Compared with LTC1628CG-PG#TRPBF, the LTC1628CG#TRPBF trades PGOOD functionality for lower cost and simpler system integration; versus MP2918GL-Z, it provides design adaptability via programmable frequency, multiple low-power modes, and dual integrated LDOs - critical for portable and battery-sensitive applications.
Availability
LTC1628CG#TRPBF is available at Aetrix Electronics and suitable for notebook computers, portable instrumentation, and industrial DC power distribution systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC1628CG#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 ICs, serving industrial, automotive, communications, and healthcare markets.
The LTC1628 product line was designed specifically for high-efficiency, dual-rail DC/DC conversion in portable and battery-operated systems - emphasizing low quiescent current, flexible control architecture, and robust fault protection without sacrificing precision.
FAQ
What is the key functional difference between LTC1628CG#TRPBF and LTC1628CG-PG#TRPBF?
The LTC1628CG#TRPBF lacks the PGOOD open-drain output pin present on the LTC1628CG-PG#TRPBF; instead, it retains the FLTCPL pin for fault coupling control between channels. This makes the LTC1628CG#TRPBF appropriate for designs where power-good signaling is handled externally or omitted, reducing component count and cost while preserving full dual-channel control capability.
Does LTC1628CG#TRPBF support remote output voltage sensing?
Yes, LTC1628CG#TRPBF supports remote sensing via dedicated VOSENSE1 and VOSENSE2 pins, allowing Kelvin connection to the load to compensate for PCB trace resistance. This ensures ±1% output accuracy even with voltage drops up to several hundred millivolts between converter and load terminals.
Can LTC1628CG#TRPBF operate with input voltages below 5V?
Yes, LTC1628CG#TRPBF supports input voltages down to 3.5V (UVLO threshold), enabling operation from single-cell LiFePO₄ (3.6V nominal) or two-cell alkaline batteries. Its 99.4% maximum duty cycle sustains regulation even when VIN approaches VOUT, making it suitable for deep-discharge battery applications.
How does the FCB pin affect operating mode in LTC1628CG#TRPBF?
In LTC1628CG#TRPBF, the FCB pin selects among three modes: <0.8V → forced continuous conduction; 0.8–2.7V → Burst Mode for highest light-load efficiency; >4.3V → constant-frequency discontinuous mode. Unlike the PG variant, FCB controls only Channel 1 unless FLTCPL is tied to INTVCC - a configuration supported by this part.
Is EXTVCC required for normal operation of LTC1628CG#TRPBF?
No, EXTVCC is optional. When left unconnected, LTC1628CG#TRPBF uses its internal 5V LDO (INTVCC) to power gate drivers and control circuitry. Connecting EXTVCC >4.7V disables the LDO and routes external power directly to INTVCC - improving efficiency in self-biased or secondary-winding configurations.
LTC1628CG#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 3.5V ~ 30V
- Frequency - Switching:
- 220kHz
- Duty Cycle (Max):
- 99.4%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Power Good, Soft Start
- Operating Temperature:
- 0°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC1628CG#TRPBF FAQ
1.How can I place an order for LTC1628CG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1628CG#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 LTC1628CG#TRPBF reliable?
The price and inventory of LTC1628CG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1628CG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1628CG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1628CG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1628CG#TRPBF?
LTC1628CG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1628CG#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 LTC1628CG#TRPBF?
For technical support, including LTC1628CG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1628CG#TRPBF requirements.
6.How does Aetrix verify that LTC1628CG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1628CG#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 LTC1628CG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1628CG#TRPBF?
All LTC1628CG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1628CG#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 LTC1628CG#TRPBF part is unused and in its original packaging.
Return procedure for LTC1628CG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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