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Analog Devices Inc. LTC1628IG#PBF
- Part No.:
- LTC1628IG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1628IG#PBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,851
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Product details
Overview
LTC1628IG#PBF from Analog Devices (formerly Linear Technology) is a dual-phase, synchronous step-down switching regulator controller driving two independent N-channel MOSFET stages. It delivers ±1% output voltage accuracy, supports 3.5V–36V input, enables 150kHz–300kHz adjustable switching frequency, and features out-of-phase operation to reduce input capacitance and supply noise - used in notebook computers and battery-powered digital systems requiring dual 5V/3.3V rails.
For engineers reviewing the LTC1628IG#PBF datasheet, LTC1628IG#PBF pinout, LTC1628IG#PBF application, or LTC1628IG#PBF equivalent, key selection criteria include its dual-channel current-mode control architecture, OPTI-LOOP® compensation for wide output capacitor ESR tolerance, remote sense capability, and integrated 5V/3.3V standby regulators - all critical for high-efficiency portable power design.
Technical Context
The LTC1628IG#PBF implements a constant-frequency, current-mode control architecture with two channels operating 180° out of phase. Each channel uses an internal transconductance error amplifier (gm = 1.3 mmho, GBW = 3 MHz) and a precision 0.8V feedback reference to regulate output voltage with ±1% accuracy over temperature and line/load conditions.
It integrates dual gate drivers (TG1/TG2, BG1/BG2) with <90ns transition times, supports forced continuous, Burst Mode®, and constant-frequency operation via the FCB pin, and includes dedicated protection features: foldback current limiting, latched short-circuit shutdown (defeatable), output overvoltage lockout (±7.5%), and dropout detection enabling 99.4% duty cycle operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports full range of battery chemistries (Li-ion, lead-acid, multi-cell alkaline) and industrial DC supplies. |
| Output Voltage Accuracy | ±1% at VOSENSE - ensures stable microprocessor core and I/O rail regulation across temperature and load. |
| Switching Frequency Range | 150kHz to 300kHz (adjustable via FREQSET) - balances efficiency, size, and EMI in compact layouts. |
| Max Duty Cycle | 99.4% - enables ultra-low dropout operation down to VIN ≈ VOUT + 0.3V, critical for battery end-of-life support. |
| Feedback Reference Voltage | 0.800V ±0.8% - low-voltage reference minimizes divider resistor power loss and improves light-load accuracy. |
| Shutdown Quiescent Current | 20µA - enables long-term battery standby in portable instruments and PDAs without significant drain. |
| 3.3V Standby Regulator | 3.35V ±1.5% @ 10mA - powers wake-up circuitry or low-power peripherals independently of main switchers. |
Pinout & Package
Package: 28-pin plastic SSOP (G package), 5.6mm × 10.2mm body, 0.635mm pitch, exposed pad not present. RoHS-compliant, lead-free (PbF).
| 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; latchoff triggered by sustained low VOSENSE. |
| SENSE1+, SENSE1− SENSE2+, SENSE2− |
Differential current sense inputs | Measure voltage across RSENSE to set peak current limit; total source current ≤ –60µA ensures minimal offset error. |
| VOSENSE1, VOSENSE2 | Remote feedback inputs | Accept resistive divider output from regulated rail; ±7.5% PGOOD threshold (LTC1628-PG variant only) ensures system-level rail integrity monitoring. |
| TG1, TG2 / BG1, BG2 | Top/bottom gate drivers | Drive N-MOSFET gates with <90ns rise/fall; TG swing = INTVCC–0.5V referenced to SW node; BG swing = 0V to INTVCC. |
| FREQSET | Oscillator frequency control | Open = ~220kHz; grounded = ~140kHz; 2.4V = ~310kHz - enables EMI tuning and inductor size optimization. |
| STBYMD | Standby mode selector | Ground = global shutdown; open = normal soft-start enable; >2V = forces 5V/3.3V LDOs active for wake-up logic. |
| FCB | Forced continuous / Burst Mode select | <0.8V = continuous PWM; 0.8–2.8V = Burst Mode; >4.3V = constant frequency - determines light-load efficiency vs. ripple trade-off. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual controllers | Reduces RMS input ripple current by ~70%, cutting required CIN volume by ≥50% and lowering EMI filter cost. |
| OPTI-LOOP® compensation | Enables stable loop response across ceramic, polymer, and electrolytic output capacitors - eliminates need for external compensation redesign. |
| Integrated 5V/3.3V standby LDOs | Provides always-on bias for supervisor ICs, RTCs, or USB suspend logic without external regulators or BOM overhead. |
| Programmable soft-start | Adjustable ramp time via CSS capacitor prevents inrush-induced input droop and avoids false UVLO triggering during power-up. |
| Output overvoltage protection | Latches bottom MOSFET on until VOSENSE returns within ±7.5% - protects downstream logic from transient overshoot or feedback fault. |
Applications
| Notebook Computer Power System | Battery-Powered Test Instrument |
|---|---|
|
Use Scenario: Dual-rail power for CPU core (5V) and I/O (3.3V) in space-constrained clamshell designs with Li-ion battery input. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing independent current-mode loops with out-of-phase timing to minimize input ripple. Use Value: Enables single-inductor-per-rail layout with 50% smaller input bulk capacitance and reduced thermal stress on input caps versus single-phase solutions. |
Use Scenario: Portable multimeter or oscilloscope requiring isolated 5V analog front-end and 3.3V digital logic rails from 7.2V–28V battery pack. IC Role / Device Role / Timing Role: High-efficiency dual buck controller with remote sensing and ±1% accuracy ensuring ADC reference stability and digital logic margin. Use Value: Maintains 90%+ efficiency at 100mA–5A loads and supports 99.4% duty cycle for extended runtime as battery discharges to 3.6V. |
| Industrial DC Distribution Module | Automotive Infotainment Head Unit |
|
Use Scenario: DIN-rail mounted 24V-to-5V/3.3V converter supplying PLC I/O modules and fieldbus interfaces in harsh environments. IC Role / Device Role / Timing Role: Robust dual-channel controller with UVLO (3.5V), overvoltage lockout, and foldback current limiting for unregulated 24V bus operation. Use Value: Survives 40V load-dump transients via 36V absolute max VIN rating and sustains regulation during brownouts down to 3.6V input. |
Use Scenario: In-vehicle navigation system powered from 9V–16V automotive battery with strict EMI and thermal constraints. IC Role / Device Role / Timing Role: Dual-phase buck controller operating 180° out-of-phase to suppress conducted emissions in AM/FM bands. Use Value: Reduces peak input current harmonics by 20dB compared to single-phase, easing compliance with CISPR 25 Class 5 limits. |
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 but no standalone 3.3V LDO; fixed 500kHz frequency; no FCB-selectable Burst Mode. | Requires external 3.3V LDO for standby logic; higher switching frequency demands smaller inductors but increases switching loss at high VIN. | Prefer when board space is critical and 500kHz operation is acceptable; avoid if 150–300kHz EMI tuning or integrated 3.3V standby is required. |
| LTC3855EUH#PBF | Higher VIN range (4–38V); supports phase interleaving up to 6 phases; includes digital power system management interface (PMBus); no integrated 3.3V LDO. | Targeted at server/telecom with telemetry needs; lacks dedicated 3.3V standby regulator and requires external sequencing logic. | Choose for multi-phase scalability and telemetry; skip if cost-sensitive, space-constrained, or dependent on integrated 3.3V LDO for wake-up functions. |
Compared with MP2918GL-Z and LTC3855EUH#PBF, the LTC1628IG#PBF uniquely combines dual-phase control, integrated 5V/3.3V standby LDOs, programmable 150–300kHz frequency, and selectable Burst Mode - making it optimal for portable and battery-backed systems where BOM count, standby power, and EMI headroom are prioritized over digital control or ultra-high VIN.
Availability
LTC1628IG#PBF is available at Aetrix Electronics and suitable for notebook computers, battery-powered test instruments, and industrial DC distribution systems requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC1628IG#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC1628IG#PBF belongs to Linear's legacy high-efficiency DC/DC controller family, designed specifically for dual-rail portable power systems demanding low quiescent current, wide input range, and robust protection - before the advent of fully integrated power modules.
FAQ
What is the operating temperature range for the LTC1628IG#PBF?
The LTC1628IG#PBF is rated for –40°C to +85°C ambient operating temperature, matching the "I" grade designation in its part number. This industrial-grade range ensures reliable performance in battery-powered instruments, automotive infotainment units, and industrial control enclosures without derating under typical airflow conditions.
Does the LTC1628IG#PBF include a power good (PGOOD) output?
No, the LTC1628IG#PBF does not include a PGOOD output. That function is exclusive to the LTC1628IG-PG#PBF variant. The standard LTC1628IG#PBF uses the FLTCPL pin instead - which serves fault coupling control between channels and replaces the PGOOD functionality found in the -PG version.
How is the switching frequency set on the LTC1628IG#PBF?
The LTC1628IG#PBF switching frequency is set via the FREQSET pin: left open (~220kHz), tied to ground (~140kHz), or driven to 2.4V (~310kHz). An internal 1.19V reference biases the pin through a large resistor, enabling precise adjustment across 150–300kHz without external components - critical for EMI optimization and inductor selection.
Can the LTC1628IG#PBF drive both high-side and low-side N-channel MOSFETs?
Yes, the LTC1628IG#PBF integrates dual high-current gate drivers: TG1/TG2 for top-side N-MOSFETs (floating, bootstrapped) and BG1/BG2 for bottom-side N-MOSFETs (ground-referenced). Each driver supports <90ns transitions into 3300pF loads and delivers sufficient peak current to switch FDS6680A-class MOSFETs efficiently at up to 300kHz.
What protection features does the LTC1628IG#PBF provide against output overvoltage?
The LTC1628IG#PBF includes output overvoltage protection that triggers when VOSENSE deviates by more than ±7.5% from the 0.8V reference. Upon detection, the top MOSFET is turned off and the bottom MOSFET is latched on until VOSENSE returns to regulation - preventing damage to downstream 3.3V/5V logic and ensuring safe recovery after feedback divider faults.
LTC1628IG#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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC1628IG#PBF FAQ
1.How can I place an order for LTC1628IG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1628IG#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 LTC1628IG#PBF reliable?
The price and inventory of LTC1628IG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1628IG#PBF is usually 5 days.
3.What payment methods are accepted for LTC1628IG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1628IG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1628IG#PBF?
LTC1628IG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1628IG#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 LTC1628IG#PBF?
For technical support, including LTC1628IG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1628IG#PBF requirements.
6.How does Aetrix verify that LTC1628IG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1628IG#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 LTC1628IG#PBF meets industry standards.
7.What is the process for return or replacement of LTC1628IG#PBF?
All LTC1628IG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1628IG#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 LTC1628IG#PBF part is unused and in its original packaging.
Return procedure for LTC1628IG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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