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Analog Devices Inc. LTC1628CG-PG#PBF
- Part No.:
- LTC1628CG-PG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1628CG-PG#PBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:156
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Product details
Overview
LTC1628CG-PG#PBF 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 outputs. It features ±1% output voltage accuracy, 3.5V–36V input range, 150kHz–300kHz adjustable switching frequency, and integrated power-good monitoring. Designed for high-efficiency DC power distribution in battery-powered computing systems.
For engineers reviewing the LTC1628CG-PG#PBF datasheet, LTC1628CG-PG#PBF pinout, LTC1628CG-PG#PBF application, or LTC1628CG-PG#PBF equivalent, key selection criteria include dual-phase out-of-phase operation to reduce input capacitance, OPTI-LOOP® compensation for wide output capacitor ESR tolerance, remote voltage sensing, and latchable short-circuit protection with defeat option.
Technical Context
The LTC1628CG-PG#PBF implements a constant-frequency current-mode control architecture with two 180° out-of-phase channels, minimizing input ripple and EMI. Each channel uses a precision 0.8V reference, transconductance error amplifier (gm = 1.3 mmho, GBW = 3 MHz), and independent ITH-based current limit programming.
It integrates dual gate drivers (TG/BG) with <90 ns transition times, dropout detection enabling 99.4% duty cycle, and programmable soft-start via RUN/SS pins. The PGOOD pin monitors both VOSENSE1 and VOSENSE2 against ±7.5% trip thresholds with 10 µs response time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports all common battery chemistries and industrial DC rails without external pre-regulation. |
| Output Voltage Accuracy | ±1% at 0.8V feedback reference - ensures tight regulation for sensitive microprocessor core and I/O supplies. |
| Switching Frequency | 150kHz to 300kHz (adjustable via FREQSET) - balances efficiency, size, and EMI across wide load and input conditions. |
| Power-Good Threshold | ±7.5% on VOSENSE1/VOSENSE2 - provides reliable system-level power sequencing and fault indication for dual-rail systems. |
| Shutdown Quiescent Current | 20µA - enables ultra-low-power standby in portable devices with active keep-alive circuitry. |
| Duty Cycle Max | 99.4% - sustains regulation under extreme dropout (e.g., 5V out from 5.2V in), critical for battery end-of-discharge operation. |
| Current Sense Threshold | 62mV to 88mV (adjustable via RSENSE) - sets precise overcurrent protection with foldback behavior below 70% VOUT. |
Pinout & Package
Package: 28-pin plastic SSOP (G package), 5.3mm × 10.2mm body, 0.635mm pitch, exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS1, RUN/SS2 | Soft-start timing & short-circuit timer inputs | Capacitor-to-ground sets ramp time; falling below 1.0V disables respective channel; used for timed latchoff during sustained overcurrent. |
| SENSE1+/SENSE1−, SENSE2+/SENSE2− | Differential current sense inputs | Measure voltage across RSENSE to set per-channel peak current limit; total source current ≤ –60 µA ensures low offset error. |
| VOSENSE1, VOSENSE2 | Remote feedback inputs | Accept resistive divider output from remote load point; ±7.5% PGOOD trip referenced to internal 0.8V bandgap. |
| PGOOD | Open-drain power-good indicator | Pulled low when either VOSENSE deviates >±7.5%; requires external pull-up to ≤7V; active within 10 µs of 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. |
| VIN, PGND, SGND | Main supply, power ground, signal ground | VIN powers INTVCC LDO and logic; PGND ties to bottom MOSFET sources; SGND must be isolated from PGND to avoid noise coupling into feedback path. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase out-of-phase operation | Reduces RMS input capacitor current by ~30% and cuts peak input ripple amplitude vs single-phase, enabling smaller, lower-cost bulk capacitance. |
| OPTI-LOOP® compensation | Allows stable loop response across 10× variation in output capacitor ESR and capacitance - eliminates need for custom compensation per design. |
| Programmable operating mode | FCB pin selects Burst Mode (high light-load efficiency), constant-frequency (low-noise), or forced continuous (secondary winding regulation). |
| Integrated 3.3V linear regulator | Delivers 10mA DC / 50mA peak from VIN - powers auxiliary circuitry (e.g., supervisors, level shifters) without external LDO. |
| Output overvoltage protection | OV comparator latches bottom MOSFET on until VOSENSE returns to ±7.5% window - prevents damage to downstream logic during transient faults. |
Applications
| Notebook Power Management | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Dual-rail CPU + I/O supply in thin-and-light notebooks with Li-ion battery input (7V–21V). IC Role / Device Role / Timing Role: Primary 5V/3.3V synchronous buck controller with phase interleaving and PGOOD sequencing. Use Value: 94% peak efficiency at 5A/5V reduces thermal load; out-of-phase operation cuts input cap size by 40% vs discrete controllers. | Use Scenario: Portable multimeter with dual analog front-end rails and low-power MCU sleep mode. IC Role / Device Role / Timing Role: Main DC/DC controller enabling burst-mode operation down to 20mA load while maintaining <20mV output ripple. Use Value: 20µA shutdown IQ extends battery life; ±1% accuracy ensures calibrated ADC reference stability. |
| Industrial DC Distribution | Automotive Infotainment |
Use Scenario: 24V vehicle-derived power system feeding 5V USB and 3.3V SoC rails in telematics gateway. IC Role / Device Role / Timing Role: High-input-voltage dual-buck controller with UVLO (3.5V) and OVP protection for harsh environments. Use Value: 36V absolute max VIN withstands load-dump transients; latchable short-circuit shutdown prevents thermal runaway during wiring faults. | Use Scenario: Head unit power supply requiring clean 5V/3.3V rails with fast PGOOD assertion for boot sequencing. IC Role / Device Role / Timing Role: Dual-phase controller with remote sensing and 10µs PGOOD response for deterministic system startup. Use Value: ±7.5% PGOOD threshold ensures reliable reset signaling; OPTI-LOOP® tolerates aging of ceramic output caps over 10-year automotive life. |
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 |
|---|---|---|---|
| LTC3728CG | Higher frequency range (250kHz–750kHz), integrated MOSFET drivers with higher peak current (4A), no integrated 3.3V LDO. | Targets compact designs needing >500kHz switching; lacks standalone 3.3V rail - requires external LDO for auxiliary power. | Select LTC3728CG when board space is constrained and higher frequency allows smaller magnetics; retain LTC1628CG-PG#PBF if integrated 3.3V LDO or lower EMI at 220kHz is required. |
| MP8765GL-Z | Single-chip dual-output buck (not controller); fixed 5V/3.3V outputs; no FREQSET or PGOOD; max VIN = 30V. | Targeted at cost-sensitive consumer electronics with fixed-rail requirements; no programmability or remote sensing. | Choose MP8765GL-Z for BOM simplification in non-critical applications; LTC1628CG-PG#PBF remains preferred for programmable frequency, PGOOD, and wide VIN (36V) in industrial designs. |
Compared with LTC3728CG and MP8765GL-Z, the LTC1628CG-PG#PBF uniquely combines dual-phase controller flexibility, integrated 3.3V LDO, PGOOD monitoring, and 36V input rating - making it optimal for ruggedized, field-programmable power systems where reliability and configurability outweigh integration density.
Availability
LTC1628CG-PG#PBF is available at Aetrix Electronics and suitable for notebook computers, battery-powered instrumentation, and industrial DC distribution systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC1628CG-PG#PBF 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, datasheets, and application engineering for legacy Linear parts including the LTC1628 family.
The LTC1628 series was designed as a high-performance dual-phase synchronous buck controller targeting portable and battery-operated systems needing tightly regulated dual-rail power with minimal input capacitance and robust fault protection.
FAQ
What is the maximum input voltage rating for the LTC1628CG-PG#PBF?
The LTC1628CG-PG#PBF has an absolute maximum input voltage (VIN) rating of 36V. Operation is specified from 3.5V to 30V, with 36V representing the upper limit beyond which device reliability may be impaired. This rating enables compatibility with 24V industrial rails and 12V/24V automotive systems including load-dump conditions.
Does the LTC1628CG-PG#PBF support remote voltage sensing?
Yes, the LTC1628CG-PG#PBF supports remote voltage sensing via dedicated VOSENSE1 and VOSENSE2 pins. These inputs accept feedback from resistive dividers placed directly at the load, compensating for PCB trace IR drop and ensuring ±1% regulation accuracy at the point of load - critical for microprocessor core supplies.
How does the PGOOD function work on the LTC1628CG-PG#PBF?
The PGOOD pin on the LTC1628CG-PG#PBF 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 10 µs after both outputs return to regulation. An external pull-up resistor (to ≤7V) is required, and the pin asserts only when both rails are simultaneously in specification.
Can the LTC1628CG-PG#PBF operate in burst mode for improved light-load efficiency?
Yes, the LTC1628CG-PG#PBF supports Burst Mode® operation via the FCB pin. When FCB voltage is between 0.80V and (INTVCC – 2V), the controller enters Burst Mode, disabling switching until output voltage droop triggers a burst of cycles - achieving >85% efficiency at 20mA load while maintaining <20mV peak-to-peak ripple.
What package type is used for the LTC1628CG-PG#PBF?
The LTC1628CG-PG#PBF is supplied in a 28-pin plastic SSOP (G package) with dimensions 5.3mm × 10.2mm and 0.635mm lead pitch. It is not the QFN variant (UH package); this SSOP version features exposed pad omission and is optimized for through-hole or fine-pitch surface-mount assembly with standard reflow profiles.
LTC1628CG-PG#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- 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-PG#PBF FAQ
1.How can I place an order for LTC1628CG-PG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1628CG-PG#PBF 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-PG#PBF reliable?
The price and inventory of LTC1628CG-PG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1628CG-PG#PBF is usually 5 days.
3.What payment methods are accepted for LTC1628CG-PG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1628CG-PG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1628CG-PG#PBF?
LTC1628CG-PG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1628CG-PG#PBF 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-PG#PBF?
For technical support, including LTC1628CG-PG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1628CG-PG#PBF requirements.
6.How does Aetrix verify that LTC1628CG-PG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1628CG-PG#PBF 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-PG#PBF meets industry standards.
7.What is the process for return or replacement of LTC1628CG-PG#PBF?
All LTC1628CG-PG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1628CG-PG#PBF, 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-PG#PBF part is unused and in its original packaging.
Return procedure for LTC1628CG-PG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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