My Inquiry
My Account
Analog Devices Inc. LTC1628CG-PG#TRPBF
- Part No.:
- LTC1628CG-PG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1628CG-PG#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,007
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC1628CG-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 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 dual-rail DC/DC conversion in space-constrained portable systems.
For engineers reviewing the LTC1628CG-PG#TRPBF datasheet, LTC1628CG-PG#TRPBF pinout, LTC1628CG-PG#TRPBF application, or LTC1628CG-PG#TRPBF equivalent, key selection criteria include out-of-phase operation to reduce input capacitance, OPTI-LOOP® compensation for wide-output-capacitance compatibility, dual soft-start control, and PGOOD assertion with ±7.5% output tolerance detection.
Technical Context
The LTC1628CG-PG#TRPBF implements a constant-frequency current-mode architecture with 180° phase shift between channels, minimizing input ripple and ESR-related losses. Its transconductance error amplifiers (gm = 1.3 mmho, GBW = 3 MHz) drive ITH pins to set peak inductor current, while remote sensing (VOSENSE1/2) enables precision regulation independent of PCB trace resistance.
It integrates dual gate drivers (TG1/TG2, BG1/BG2) with <90 ns transition times, a 0.8V precision reference, and dedicated protection circuitry including foldback current limiting, output overvoltage lockout (±7.5%), and latched short-circuit shutdown with defeat option. The PGOOD pin asserts low when either VOSENSE deviates >±7.5% from nominal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports 12V/24V industrial rails and full battery chemistries (Li-ion, lead-acid, NiMH). |
| Output Voltage Accuracy | ±1% at VOSENSE - ensures stable microprocessor core and I/O rail regulation under load and temperature variation. |
| Switching Frequency | 150kHz to 300kHz (adjustable via FREQSET) - balances efficiency, size, and EMI in compact layouts. |
| PGOOD Threshold | ±7.5% on VOSENSE1 or VOSENSE2 - provides reliable system power sequencing and fault indication. |
| Duty Cycle Max | 99.4% - enables ultra-low dropout operation down to VIN ≈ VOUT + 0.2V, critical for battery end-of-life support. |
| Shutdown IQ | 20µA - minimizes standby power in always-on subsystems without compromising wake-up latency. |
| Current Sense Threshold | 62mV to 88mV (adjustable via RSENSE) - sets precise overcurrent protection with minimal power loss in sense resistor. |
Pinout & Package
Package: 28-pin plastic SSOP (G package), 5.0mm × 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-based ramp controls inrush current; falling below 1.0V shuts down respective channel; discharge current triggers latchoff during sustained overcurrent. |
| VOSENSE1, VOSENSE2 | Remote feedback input | Accepts resistive divider output from regulated rail; referenced to internal 0.8V bandgap; enables accurate regulation despite PCB IR drop. |
| PGOOD | Open-drain power-good indicator | Pulled low if either VOSENSE deviates >±7.5%; requires external pull-up to ≤7V; asserts within 10µs of valid condition. |
| TG1, TG2, BG1, BG2 | Top/bottom gate drivers | Drive N-MOSFET gates with <90 ns rise/fall; TG swing = INTVCC – 0.5V superimposed on SW node; BG swing = 0V to INTVCC. |
| FREQSET | Oscillator frequency control | Adjusts fOSC from 140kHz to 310kHz; open = ~220kHz; 0V = ~140kHz; 2.4V = ~310kHz; supports external AC modulation. |
| STBYMD | Standby mode selector | Ground = global shutdown; open = normal operation; >2V = enables 5V/3.3V LDOs regardless of RUN/SS state for wake-up circuits. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual controllers | Reduces RMS input capacitor current by up to 70%, enabling smaller, lower-ESR input capacitors and lower supply-induced noise. |
| OPTI-LOOP® compensation | Allows stable loop response across 10× variation in COUT and ESR - eliminates need for custom compensation per output capacitor type. |
| Dual independent soft-start | Separate RUN/SS pins enable staggered startup of 5V and 3.3V rails to prevent inrush current stacking and system brownout. |
| Programmable operating modes | 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 to auxiliary circuitry (e.g., supervisors, level shifters) - eliminates need for external LDO. |
Applications
| Portable Computing Power | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Dual-rail power for notebook CPU core (5V) and I/O (3.3V) with tight thermal envelope and battery life constraints. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing independent 5A/5A outputs with out-of-phase timing to minimize input ripple. Use Value: 90%+ efficiency at full load and >85% at 100mA reduces heat dissipation by >3W vs single-phase design, extending battery runtime. |
Use Scenario: Precision analog front-end and digital logic supply in handheld multimeters or data loggers powered by 3×AA batteries. IC Role / Device Role / Timing Role: Primary DC/DC controller delivering regulated 5V/3.3V from 4.5V–9V battery input with ultra-low shutdown IQ. Use Value: 20µA shutdown current extends shelf life beyond 10 years; ±1% accuracy maintains ADC reference stability across temperature. |
| Industrial DC Distribution | Automotive Infotainment |
Use Scenario: Centralized 24V-to-5V/3.3V conversion in programmable logic controllers with high reliability requirements. IC Role / Device Role / Timing Role: Dual-channel controller with PGOOD monitoring and overvoltage protection for system-level power sequencing and fault reporting. Use Value: PGOOD assertion with ±7.5% tolerance ensures safe boot of FPGA and microcontroller; latchoff with defeat prevents false trips during transient loads. |
Use Scenario: Power management for head unit display and audio DSP in 12V automotive systems with cold-crank (6V) and load-dump (36V) transients. IC Role / Device Role / Timing Role: High-input-voltage buck controller supporting 3.5V–36V operation with UVLO at 3.5V and 99.4% max duty cycle. Use Value: Maintains 5V output during cold-crank down to 6.5V input; withstands 36V load-dump without external clamping. |
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 |
|---|---|---|---|
| MP2918GQ-Z | Single-chip dual-phase controller with integrated MOSFETs; fixed 500kHz frequency; no PGOOD pin; 4.5V–18V VIN. | Suitable for cost-sensitive, medium-power applications where board space is critical but input voltage range is limited. | Select MP2918GQ-Z only if input stays within 4.5V–18V and integrated FETs meet RDS(on) and thermal requirements. |
| TPS546D24RSAR | 60A dual-phase controller with PMBus interface, digital loop compensation, and 4.5V–18V VIN; no standalone PGOOD, uses ALERT#. | Targeted at server/telecom with telemetry needs; requires firmware configuration; lacks analog PGOOD simplicity. | Choose TPS546D24RSAR when digital control, margining, and real-time telemetry outweigh need for analog PGOOD and wide VIN. |
Compared with MP2918GQ-Z and TPS546D24RSAR, the LTC1628CG-PG#TRPBF uniquely combines 3.5V–36V operation, discrete MOSFET flexibility, analog PGOOD with ±7.5% threshold, and out-of-phase noise reduction-making it optimal for ruggedized portable and industrial dual-rail designs where input range and analog reliability are paramount.
Availability
LTC1628CG-PG#TRPBF is available at Aetrix Electronics and suitable for notebook computing power supplies, 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#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 semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC1628CG-PG#TRPBF belongs to Linear's legacy high-efficiency DC/DC controller family, engineered specifically for dual-rail, space-constrained portable and industrial applications demanding wide input range, precision regulation, and robust fault protection.
FAQ
What is the function of the PGOOD pin on the LTC1628CG-PG#TRPBF?
The PGOOD pin on the LTC1628CG-PG#TRPBF is an open-drain output that pulls low when either VOSENSE1 or VOSENSE2 deviates more than ±7.5% from its nominal regulated voltage. It asserts within 10µs of valid regulation and requires an external pull-up resistor to ≤7V. This pin is absent on the non-PG variant (LTC1628CG#TRPBF) and replaces FLTCPL on the LTC1628CG-PG#TRPBF.
How does the LTC1628CG-PG#TRPBF achieve out-of-phase operation and why is it beneficial?
The LTC1628CG-PG#TRPBF internally clocks its two controller channels 180° out of phase. This staggers the input current pulses, reducing RMS input capacitor current by up to 70% and lowering peak input ripple voltage. As a result, designers can use smaller, lower-ESR input capacitors and reduce conducted EMI - critical in compact portable systems where board area and noise margins are constrained.
Can the LTC1628CG-PG#TRPBF operate with input voltages below 3.5V?
No - the LTC1628CG-PG#TRPBF has a guaranteed minimum input voltage of 3.5V due to its internal undervoltage lockout (UVLO) threshold, which is specified at 3.5V (min) and 4.0V (max). Operation below 3.5V is not supported and may result in unstable regulation or failure to start. For sub-3.5V inputs, a pre-regulator or alternative controller with lower UVLO is required.
What is the purpose of the STBYMD pin on the LTC1628CG-PG#TRPBF?
The STBYMD pin on the LTC1628CG-PG#TRPBF is a three-state control input: grounded to globally shut down both controllers; left open for normal operation with independent RUN/SS control; or pulled above 2V to activate both internal 5V and 3.3V LDOs regardless of RUN/SS state - enabling "always-on" wake-up circuitry. It must be decoupled with 0.01µF to ground if floating.
Does the LTC1628CG-PG#TRPBF support remote output voltage sensing?
Yes - the LTC1628CG-PG#TRPBF supports true remote sensing via VOSENSE1 and VOSENSE2 pins, which accept feedback signals from external resistive dividers placed directly at the load. This compensates for voltage drop across PCB traces and connectors, ensuring ±1% output accuracy at the point of load - essential for powering sensitive microprocessors and analog circuitry.
LTC1628CG-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:
- 0°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC1628CG-PG#TRPBF FAQ
1.How can I place an order for LTC1628CG-PG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1628CG-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 LTC1628CG-PG#TRPBF reliable?
The price and inventory of LTC1628CG-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 LTC1628CG-PG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1628CG-PG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1628CG-PG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1628CG-PG#TRPBF?
LTC1628CG-PG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1628CG-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 LTC1628CG-PG#TRPBF?
For technical support, including LTC1628CG-PG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1628CG-PG#TRPBF requirements.
6.How does Aetrix verify that LTC1628CG-PG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1628CG-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 LTC1628CG-PG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1628CG-PG#TRPBF?
All LTC1628CG-PG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1628CG-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 LTC1628CG-PG#TRPBF part is unused and in its original packaging.
Return procedure for LTC1628CG-PG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC1628CG-PG#TRPBF Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
