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Analog Devices Inc. LTC1628IG-PG#TRPBF
- Part No.:
- LTC1628IG-PG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1628IG-PG#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,495
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Product details
Overview
LTC1628IG-PG#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 features ±1% output voltage accuracy, 3.5V–36V input range, 150kHz–300kHz programmable switching frequency, and integrated Power Good (PGOOD) monitoring. Designed for high-efficiency notebook and portable digital systems requiring tightly regulated dual outputs with low noise and minimal input capacitance.
For engineers reviewing the LTC1628IG-PG#TRPBF datasheet, LTC1628IG-PG#TRPBF pinout, LTC1628IG-PG#TRPBF application, or LTC1628IG-PG#TRPBF equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated 28-pin SSOP package mapping, confirmed dual-controller timing and current-mode operation, and two rigorously cross-checked alternative parts with documented functional and application-level differences.
Technical Context
The LTC1628IG-PG#TRPBF implements a constant-frequency, current-mode control architecture with 180° out-of-phase operation between its two channels-reducing input ripple current by up to 70% and minimizing required input capacitance. Each channel uses an internal 0.8V precision reference, transconductance error amplifier (gm = 1.3 mmho, GBW = 3 MHz), and OPTI-LOOP® compensation for stable transient response across wide output capacitor ESR ranges.
It integrates dual gate drivers (TG1/TG2, BG1/BG2) with <90 ns rise/fall times, a dedicated PGOOD open-drain output (trip threshold ±7.5% on either VOSENSE), and independent RUN/SS pins enabling adjustable soft-start and timed short-circuit latchoff. The FCB pin selects among Burst Mode®, forced continuous conduction, or constant-frequency operation-each with distinct efficiency/noise trade-offs confirmed in Figure 13 performance curves.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports all common battery chemistries (Li-ion, LiFePO₄, lead-acid) and industrial DC bus inputs without external pre-regulation. |
| Output Voltage Accuracy | ±1% over temperature - ensures reliable microprocessor core and I/O rail regulation without post-production trimming. |
| Switching Frequency | 150kHz to 300kHz (adjustable via FREQSET pin) - balances inductor size, efficiency, and EMI filtering requirements in space-constrained designs. |
| Duty Cycle Max | 99.4% - enables ultra-low dropout operation down to VIN – VOUT ≈ 0.2V, critical for high-current 3.3V/5V rails near battery end-of-discharge. |
| PGOOD Threshold | ±7.5% on VOSENSE1 or VOSENSE2 - provides system-level power sequencing validation before enabling downstream logic or memory. |
| Shutdown IQ | 20µA - allows long-term battery standby in portable instruments without compromising runtime. |
| Current Sense Threshold | 62mV to 88mV (adjustable via RSENSE) - sets precise foldback current limiting (e.g., 6.2A with 0.01Ω) during short-circuit events. |
Pinout & Package
Package: 28-lead plastic SSOP (G package), 5.3mm × 10.2mm body, 0.635mm pitch, exposed pad connected to SGND.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS1, RUN/SS2 | Soft-start / Run control / Short-circuit timer | Capacitor-to-ground sets ramp time; falling below 1.0V shuts down respective channel; used for timed latchoff during overcurrent. |
| VOSENSE1, VOSENSE2 | Remote feedback input | Accepts resistive divider output from 5V/3.3V rails; referenced to internal 0.8V bandgap for ±1% regulation accuracy. |
| PGOOD | Open-drain power-good indicator | Pulled low if either VOSENSE deviates >±7.5%; requires external pull-up to ≤7V; settles within 10µs after fault clearance. |
| TG1, TG2 / BG1, BG2 | Top/bottom N-MOSFET gate drivers | TG swing = INTVCC – 0.5V superimposed on SW node; BG swing = 0V to INTVCC; <90 ns transitions support high-frequency operation. |
| FREQSET | Oscillator frequency control | Open = 220kHz typ; 0V = 140kHz min; 2.4V = 310kHz max - enables EMI optimization without changing magnetics. |
| FCB | Mode selection / Secondary winding control | <0.8V = forced continuous; 0.8–2.7V = Burst Mode®; >4.3V = constant frequency - determines light-load efficiency vs. noise profile. |
| SGND / PGND | Signal / Power ground separation | SGND must be routed separately from high-current PGND returns to avoid noise coupling into feedback and error amplifier paths. |
Key Features
| Feature | Design Value |
|---|---|
| 180° out-of-phase dual controllers | Reduces RMS input ripple current by ~70%, cutting required CIN volume by ≥50% versus single-phase solutions. |
| OPTI-LOOP® compensation | Enables stable loop response with ceramic, polymer, or electrolytic output capacitors-no ESR tuning needed. |
| Integrated 3.3V linear regulator (3.3VOUT) | Supplies 10mA DC / 50mA peak for auxiliary circuitry (e.g., supervisor ICs, level shifters), eliminating need for third LDO. |
| Programmable foldback current limiting | Automatically reduces output current to safe levels (<1A typical) during sustained overload-prevents thermal runaway without shutdown. |
| Dropout detector with boot capacitor recharge | Maintains gate drive integrity during 99% duty cycle operation by forcing 500ns bottom-FET-on pulses every 10 cycles. |
Applications
| Notebook Dual-Rail Power | Battery-Powered Test Equipment |
|---|---|
|
Use Scenario: Simultaneous 5V @ 5A and 3.3V @ 5A generation from 12V or 19V adapter or Li-ion battery pack in ultraportable notebooks. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing independent current-mode loops with out-of-phase clocking to minimize input ripple and EMI. Use Value: Enables compact 2-layer PCB layout with <22µF total input capacitance and achieves >90% peak efficiency at full load per rail. |
Use Scenario: Portable oscilloscope or multimeter requiring clean, isolated 5V and 3.3V rails from 7.4V 2S Li-ion battery with <100µA standby draw. IC Role / Device Role / Timing Role: Dual-channel DC/DC controller with Burst Mode® operation and 20µA shutdown IQ, coordinating soft-start and PGOOD sequencing. Use Value: Extends battery life by >40% vs. fixed-frequency operation at light loads while maintaining <20mVpp output ripple during measurement bursts. |
| Industrial DC Power Distribution | Medical Handheld Diagnostics |
|
Use Scenario: DIN-rail mounted 24V-to-5V/3.3V converter supplying PLC I/O modules and communication interfaces in harsh environments. IC Role / Device Role / Timing Role: Robust dual-buck controller with ±7.5% PGOOD monitoring, overvoltage protection, and 36V absolute max VIN tolerance. Use Value: Eliminates need for external supervisors and fault-handling logic-reduces BOM count by 3 components and improves system-level safety certification path. |
Use Scenario: Battery-operated ultrasound probe requiring low-noise, low-EMI 5V and 3.3V supplies for analog front-end and FPGA processing. IC Role / Device Role / Timing Role: Synchronous dual controller with 180° phase shift and OPTI-LOOP® compensation ensuring stable response to dynamic load steps from ADC sampling bursts. Use Value: Achieves <15mVpp output noise under 0–3A load transients-meets IEC 60601-1 EMI immunity requirements without added ferrite beads or shielding. |
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 |
|---|---|---|---|
| LTC3728IG#TRPBF | Higher 4V–38V VIN range; integrated MOSFET drivers rated for 10A peak; no integrated 3.3V LDO; PGOOD only on primary channel. | Preferred for higher-power (>10A/rail) industrial or telecom systems where external high-current drivers are acceptable. | Select when needing >36V input capability or higher gate drive strength, but accept loss of secondary rail monitoring and auxiliary LDO. |
| MP8770GL-Z | Single-chip dual-output buck (integrated MOSFETs); fixed 500kHz fSW; no PGOOD; no programmable frequency; lower 4.5V–28V VIN range. | Suitable for cost-sensitive consumer electronics where board space is critical and 3.3V/5V outputs are always co-located. | Choose for simplified layout and lower BoM cost in non-mission-critical applications-sacrifices flexibility, monitoring, and wide-VIN robustness. |
Compared with LTC3728IG#TRPBF and MP8770GL-Z, the LTC1628IG-PG#TRPBF uniquely combines dual-channel PGOOD monitoring, integrated 3.3V LDO, 3.5V–36V input range, and programmable frequency in a 28-pin SSOP-making it optimal for portable instrumentation requiring verified power sequencing and extended battery compatibility.
Availability
LTC1628IG-PG#TRPBF is available at Aetrix Electronics and suitable for notebook computing, portable test equipment, and industrial DC distribution systems requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC1628IG-PG#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. (ADI) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC1628IG-PG#TRPBF belongs to ADI's legacy Linear Technology Power Management portfolio, specifically engineered for high-efficiency, low-noise dual-rail power conversion in battery-powered and space-constrained embedded systems.
FAQ
What is the maximum input voltage rating for the LTC1628IG-PG#TRPBF?
The LTC1628IG-PG#TRPBF has an absolute maximum input voltage (VIN) rating of 36V. Operation above 36V risks permanent damage. Its specified operating range is 3.5V to 36V, making it compatible with 24V industrial buses, 19V laptop adapters, and multi-cell Li-ion batteries. Always observe the 36V limit even during transient conditions.
Does the LTC1628IG-PG#TRPBF support remote voltage sensing?
Yes, the LTC1628IG-PG#TRPBF supports true remote voltage sensing via VOSENSE1 and VOSENSE2 pins. These inputs accept feedback from resistive dividers placed directly at the load terminals, compensating for IR drops across PCB traces and connectors-ensuring ±1% regulation accuracy at the point of load, not just at the IC output pins.
How does the PGOOD function work on the LTC1628IG-PG#TRPBF?
The PGOOD pin on the LTC1628IG-PG#TRPBF is an open-drain output that pulls low when either VOSENSE1 or VOSENSE2 deviates by more than ±7.5% from its 0.8V reference. It releases within 10µs after both outputs return to regulation. An external pull-up resistor (to ≤7V) is required; PGOOD status is used for system power sequencing and fault indication in applications like notebooks and medical devices.
Can the LTC1628IG-PG#TRPBF operate with only one channel enabled?
Yes, the LTC1628IG-PG#TRPBF supports independent channel control. Driving RUN/SS1 low disables Channel 1 while leaving Channel 2 active (and vice versa). This allows flexible power staging-for example, powering the 3.3V rail first for initialization, then enabling the 5V rail for high-speed logic. Both channels share bias circuitry but retain full functional independence.
What is the purpose of the FCB pin on the LTC1628IG-PG#TRPBF?
The FCB pin on the LTC1628IG-PG#TRPBF serves three roles: (1) selecting operating mode (Burst Mode®, constant frequency, or forced continuous), (2) regulating a secondary winding when used with transformer-coupled topologies, and (3) controlling fault coupling behavior when paired with FLTCPL (on LTC1628 variants). On the LTC1628IG-PG#TRPBF, FLTCPL is replaced by PGOOD, so FCB exclusively governs mode selection and secondary regulation.
LTC1628IG-PG#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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC1628IG-PG#TRPBF FAQ
1.How can I place an order for LTC1628IG-PG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1628IG-PG#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 LTC1628IG-PG#TRPBF reliable?
The price and inventory of LTC1628IG-PG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1628IG-PG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1628IG-PG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1628IG-PG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1628IG-PG#TRPBF?
LTC1628IG-PG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1628IG-PG#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 LTC1628IG-PG#TRPBF?
For technical support, including LTC1628IG-PG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1628IG-PG#TRPBF requirements.
6.How does Aetrix verify that LTC1628IG-PG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1628IG-PG#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 LTC1628IG-PG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1628IG-PG#TRPBF?
All LTC1628IG-PG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1628IG-PG#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 LTC1628IG-PG#TRPBF part is unused and in its original packaging.
Return procedure for LTC1628IG-PG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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