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Analog Devices Inc. LTC1628IG#TRPBF
- Part No.:
- LTC1628IG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1628IG#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,907
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Product details
Overview
LTC1628IG#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 output generation. It features ±1% output voltage accuracy, 150kHz–300kHz adjustable fixed-frequency operation, and out-of-phase channel timing to reduce input capacitance requirements and power supply noise. Designed for high-efficiency DC power distribution in battery-powered portable electronics.
For engineers reviewing the LTC1628IG#TRPBF datasheet, LTC1628IG#TRPBF pinout, LTC1628IG#TRPBF application, or LTC1628IG#TRPBF equivalent, key selection considerations include its dual-channel current-mode architecture, OPTI-LOOP® compensation, remote sense capability, 3.5V–36V wide input range, and integrated 5V/3.3V standby regulators - all critical for stable multi-rail power delivery in space-constrained systems.
Technical Context
The LTC1628IG#TRPBF implements a constant-frequency current-mode control architecture with two independent channels operating 180° out of phase. Each channel uses an internal 0.8V precision reference, transconductance error amplifier (gm = 1.3 mmho, GBW = 3 MHz), and differential current sensing via SENSE+/- pins to set overcurrent thresholds with foldback protection.
It supports three low-power modes via the FCB pin: Burst Mode® (for highest light-load efficiency), forced continuous conduction mode (for low-noise regulation), and constant-frequency discontinuous mode (for predictable EMI). The RUN/SS pins provide combined soft-start timing and timed short-circuit latchoff, while STBYMD enables coordinated shutdown or wake-up biasing of internal LDOs.
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 tight regulation for sensitive microprocessor core and I/O supplies. |
| Switching Frequency | 150kHz–300kHz (adjustable via FREQSET) - balances efficiency, size, and EMI across load conditions. |
| Duty Cycle Max | 99.4% - enables ultra-low dropout operation down to VIN – VOUT ≈ 0.1V, critical for battery end-of-life support. |
| Shutdown IQ | 20µA - minimizes system standby power loss in always-on applications like PDAs and portable instruments. |
| Current Sense Threshold | 62–88mV (adjustable via RSENSE) - sets precise overcurrent protection without external gain components. |
| Operating Temp Range | –40°C to +85°C - qualified for industrial and extended-temperature portable equipment environments. |
Pinout & Package
Package: 28-pin plastic SSOP (G package), 5.6mm × 10.2mm body, 0.635mm pitch. Exposed pad not present; SGND connection routed through pin 9.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS1, RUN/SS2 | Soft-start & latchoff timer inputs | Capacitor-to-ground sets ramp time; <1.0V forces shutdown; >4.5V arms short-circuit latchoff. |
| SENSE1+/SENSE2+, SENSE1–/SENSE2– | Differential current sense inputs | Measure voltage across RSENSE to regulate peak inductor current; reject common-mode noise up to 5V. |
| VOSENSE1, VOSENSE2 | Remote feedback inputs | Accept resistive divider output for precision regulation; referenced to 0.8V internal bandgap. |
| TG1/TG2, BG1/BG2 | Top/bottom gate drivers | Drive N-MOSFET gates synchronously; TG swing = INTVCC–0.5V superimposed on SW node; BG = 0V to INTVCC. |
| INTVCC | Internal 5V LDO output | Powers control circuitry; can be bypassed by EXTVCC ≥4.7V to improve efficiency in self-biased configurations. |
| STBYMD | Standby mode control | Three-state pin: GND = global shutdown; open = normal operation; >2V = enables 5V/3.3V LDOs regardless of RUN/SS state. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual controllers | Reduces RMS input ripple current by ~70%, cutting required CIN volume by >50% vs single-phase designs. |
| OPTI-LOOP® compensation | Enables stable loop response across wide COUT/ESR variations (ceramic, polymer, tantalum) without redesign. |
| Power Good monitor (PGOOD) | Open-drain output asserts low if either VOSENSE deviates >±7.5% - provides reliable system power sequencing signal. |
| Adjustable soft-start & fault latchoff | Single capacitor per channel sets both startup ramp time and short-circuit timeout duration (e.g., 100nF ≈ 100ms). |
| Integrated 5V/3.3V standby regulators | Delivers 10mA continuous / 50mA peak from INTVCC - powers supervisor ICs, RTCs, or wake-up logic without extra LDOs. |
Applications
| Portable Computing Power | Battery-Powered Instrumentation |
|---|---|
|
Use Scenario: Dual-rail power for notebook CPU core (5V) and I/O (3.3V) with dynamic load steps up to 5A. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing interleaved switching to minimize input/output ripple and thermal stress. Use Value: Out-of-phase operation cuts input capacitor RMS current by 70%, enabling smaller, lower-cost ceramic input banks. |
Use Scenario: Compact handheld multimeter requiring isolated 5V analog front-end and 3.3V digital logic rails from a single Li-ion cell. IC Role / Device Role / Timing Role: High-efficiency dual buck controller with wide 3.5V–36V input range and 99.4% max duty cycle for deep battery discharge support. Use Value: Enables >90% efficiency at 100mA–2A loads across battery voltage range (4.2V–2.8V), extending runtime. |
| DC Power Distribution | Industrial Portable Equipment |
|
Use Scenario: Centralized 24V-to-5V/3.3V conversion in ruggedized field data logger with EMI-sensitive sensors. IC Role / Device Role / Timing Role: Dual-channel current-mode controller with selectable Burst Mode® for ultra-low idle power and constant-frequency mode for EMI control. Use Value: Burst Mode® reduces no-load IQ to 125µA while maintaining <20mV output ripple - ideal for battery-buffered logging. |
Use Scenario: Power management in explosion-proof handheld HART communicator operating in –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Industrial-grade dual buck controller with –40°C to +85°C temp rating, remote sense, and overvoltage/overcurrent protection. Use Value: ±1% output accuracy and output overvoltage lockout (0.84–0.88V trip) ensure sensor interface stability under transient faults. |
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 |
|---|---|---|---|
| MP2918GL-Z | Single-chip dual-phase controller with integrated MOSFET drivers; lacks separate STBYMD and FLTCPL functionality; 4.5V–28V VIN. | Requires fewer external components but offers less flexible fault coupling and standby control than LTC1628IG#TRPBF. | Preferred when board space is constrained and discrete MOSFETs are not required; verify PGOOD timing compatibility. |
| LTC3855EUH#PBF | Pin-compatible upgrade with higher 500kHz max frequency, improved current sense accuracy (±0.5%), and enhanced thermal performance in QFN package. | Supports higher power density and tighter regulation in new designs; backward-compatible layout with same pinout and footprint. | Recommended for new designs needing higher efficiency above 3A/channel or improved light-load performance. |
Compared with MP2918GL-Z, LTC1628IG#TRPBF provides superior flexibility in fault isolation and standby control; compared with LTC3855EUH#PBF, it offers proven reliability in legacy industrial deployments but with lower max frequency and slightly looser current sense tolerance.
Availability
LTC1628IG#TRPBF is available at Aetrix Electronics and suitable for portable computing power, battery-operated instrumentation, and industrial DC power distribution requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC1628IG#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 and maintains full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC1628IG#TRPBF belongs to Linear's high-performance power controller family, designed specifically for efficient, low-noise, multi-rail DC/DC conversion in portable and industrial systems where thermal management and input capacitance reduction are critical.
FAQ
What is the maximum input voltage rating for the LTC1628IG#TRPBF?
The LTC1628IG#TRPBF has an absolute maximum input supply voltage (VIN) rating of 36V. Operation is specified over a functional range of 3.5V to 36V, making it compatible with 24V industrial buses and multi-cell battery packs. Exceeding 36V risks permanent damage to internal circuitry including the INTVCC regulator and gate drivers.
Does the LTC1628IG#TRPBF include a Power Good (PGOOD) output?
No - the LTC1628IG#TRPBF does not include a PGOOD output. That function is exclusive to the LTC1628IG-PG#TRPBF variant. The standard LTC1628IG#TRPBF uses the FLTCPL pin instead, which controls fault coupling between channels. Engineers requiring power sequencing must add external monitoring or select the -PG version.
How is the switching frequency set on the LTC1628IG#TRPBF?
The LTC1628IG#TRPBF switching frequency is set via the FREQSET pin, which biases internally to 1.19V. Leaving FREQSET open yields ~220kHz; tying it to ground gives ~140kHz; applying 2.4V yields ~310kHz. The relationship is linear and documented in the Electrical Characteristics table (fLOW/fHIGH specs), enabling precise EMI tuning without external components.
Can the LTC1628IG#TRPBF drive external N-channel MOSFETs in synchronous rectification mode?
Yes - the LTC1628IG#TRPBF is explicitly designed to drive external N-channel MOSFETs in synchronous buck topology. TG1/TG2 provide floating high-side gate drive referenced to SW1/SW2; BG1/BG2 provide grounded low-side drive. The datasheet specifies 50–90ns transition times and 90ns synchronous dead-time control to prevent shoot-through.
What is the purpose of the STBYMD pin on the LTC1628IG#TRPBF?
The STBYMD pin on the LTC1628IG#TRPBF provides three-state control: grounded to globally shut down both controllers; left open for normal RUN/SS-controlled operation; pulled above 2V to independently enable the internal 5V and 3.3V standby LDOs - useful for powering wake-up circuitry even when main outputs are off. A 0.01µF decoupling cap is recommended if left unconnected.
LTC1628IG#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#TRPBF FAQ
1.How can I place an order for LTC1628IG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1628IG#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#TRPBF reliable?
The price and inventory of LTC1628IG#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1628IG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1628IG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1628IG#TRPBF?
LTC1628IG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1628IG#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#TRPBF?
For technical support, including LTC1628IG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1628IG#TRPBF requirements.
6.How does Aetrix verify that LTC1628IG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1628IG#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1628IG#TRPBF?
All LTC1628IG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1628IG#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC1628IG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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