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Analog Devices Inc. LTC1628CG#PBF
- Part No.:
- LTC1628CG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1628CG#PBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:122
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Product details
Overview
LTC1628CG#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 high-efficiency 5V/3.3V power conversion. It delivers ±1% output voltage accuracy, supports 3.5V–36V input, operates up to 300kHz with out-of-phase timing to reduce input capacitance and noise, and features OPTI-LOOP® compensation for stable transient response across wide output capacitor ESR ranges - used in notebook computers and battery-powered digital systems.
For engineers reviewing the LTC1628CG#PBF datasheet, LTC1628CG#PBF pinout, LTC1628CG#PBF application, or LTC1628CG#PBF equivalent, key selection considerations include its dual-channel current-mode architecture, 28-pin SSOP package with verified pin mapping, integrated 5V/3.3V standby regulators, PGOOD monitoring (on PG variant), and configurable burst/continuous/fixed-frequency operation via FCB and STBYMD pins.
Technical Context
The LTC1628CG#PBF implements a constant-frequency, current-mode control architecture with two 180° out-of-phase channels, each featuring independent ITH error amplifier outputs, differential current sense inputs (SENSE±), and remote voltage feedback (VOSENSE). Its OPTI-LOOP® compensation allows optimization of loop stability over broad COUT/ESR combinations without external compensation network redesign.
It integrates dual gate drivers (TG/BG per channel), internal 5V LDO (INTVCC), 3.3V linear regulator (3.3VOUT), and robust protection including foldback current limiting, output overvoltage lockout (±7.5%), latchable short-circuit shutdown (via RUN/SS timing), and dropout detection enabling 99% duty cycle operation - all coordinated through dedicated pins like FREQSET, FCB, STBYMD, and FLTCPL (non-PG variant).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports full range of Li-ion, lead-acid, and industrial DC supplies without external pre-regulation. |
| Output Voltage Accuracy | ±1% at VOSENSE - ensures tight regulation for sensitive microprocessor core and I/O rails. |
| Switching Frequency | 150kHz to 300kHz (adjustable via FREQSET) - balances efficiency, size, and EMI in compact portable designs. |
| Max Duty Cycle | 99.4% - enables ultra-low dropout operation down to VIN ≈ VOUT + 0.3V, critical for battery end-of-life support. |
| Current Sense Threshold | 62mV to 88mV (adjustable via ITH) - sets precise overcurrent trip point with minimal RSENSE power loss. |
| Shutdown Quiescent Current | 20µA - minimizes battery drain during system sleep states in portable applications. |
| Operating Temperature | 0°C to +85°C - qualified for commercial-grade embedded and computing environments. |
Pinout & Package
Package: 28-lead plastic SSOP (G package), 5.3mm × 10.2mm body, 0.635mm pitch. Exposed pad not present - standard thermal pad not required.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS1, RUN/SS2 | Soft-start / Run control / Short-circuit timer | Capacitor-based ramp controls startup inrush; falling below 1.0V shuts down respective channel; discharge current triggers latchoff on sustained overcurrent. |
| SENSE1+, SENSE1− SENSE2+, SENSE2− |
Differential current sense inputs | Measure voltage across RSENSE to set peak inductor current limit; common-mode range extends to INTVCC. |
| VOSENSE1, VOSENSE2 | Remote feedback voltage inputs | Accept resistive divider output from regulated rail; internal 0.8V reference enables precision tracking of 3.3V/5V outputs. |
| TG1, TG2 / BG1, BG2 | Top/bottom N-MOSFET gate drivers | TG drives floating high-side switch with bootstrapped supply; BG drives low-side sync rectifier directly from SGND/PGND. |
| SW1, SW2 | Power switch node connections | Connect to inductor center taps; swing from ground to VIN; require low-inductance layout to minimize ringing and EMI. |
| INTVCC, EXTVCC | Internal/external VCC power inputs | INTVCC = 5V LDO output powering logic/drivers; EXTVCC >4.7V bypasses LDO for higher efficiency when using secondary winding or output-derived supply. |
| FCB | Forced continuous/burst mode select | Voltage <0.8V forces continuous PWM; 0.8V–(INTVCC−2V) enables Burst Mode; tied to INTVCC disables burst for constant frequency. |
| STBYMD | Standby mode control | GND = global shutdown; open = normal operation; >2V enables 5V/3.3V standby regulators independently of RUN/SS state. |
| FLTCPL | Fault coupling control (LTC1628 only) | INTVCC = fault coupling (both channels shut down on single short); GND = decoupled (independent fault handling). |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual-channel operation | Reduces RMS input ripple current by ~30%, cutting required input capacitance and lowering EMI emissions. |
| OPTI-LOOP® compensation | Enables stable loop response across ceramic, polymer, and electrolytic output capacitors without redesigning compensation network. |
| Dual independent soft-start | Separate RUN/SS pins allow staggered startup of 5V and 3.3V rails to prevent inrush current stacking on shared input source. |
| Integrated 3.3V linear regulator | Delivers 10mA DC (50mA peak) for auxiliary circuitry - eliminates need for external LDO in space-constrained designs. |
| Configurable low-load efficiency modes | Burst Mode (light load), constant frequency (low-noise), or forced continuous (output sink capability) - selectable per application needs. |
| Comprehensive protection suite | Includes foldback current limiting, output overvoltage lockout (±7.5%), latchable short-circuit shutdown, and dropout detection with auto-recharge. |
Applications
| Notebook Computer Power System | Battery-Powered Digital Instrument |
|---|---|
|
Use Scenario: Dual-rail power delivery for CPU core (5V) and I/O (3.3V) in ultraportable notebooks with Li-ion battery input (7V–24V). IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing independent current loops, phase interleaving, and coordinated soft-start sequencing. Use Value: Reduces input capacitor count by 40% vs. single-phase design while maintaining <20mV output ripple under dynamic load steps. |
Use Scenario: Compact handheld test equipment requiring isolated 5V and 3.3V rails from a 12V sealed lead-acid battery with deep discharge tolerance. IC Role / Device Role / Timing Role: High-efficiency DC/DC controller enabling 99% duty cycle operation down to 3.8V input, preserving runtime at battery end-of-life. Use Value: Maintains regulated output during brownout conditions where competing controllers drop out, extending usable battery capacity by >15%. |
| Industrial DC Power Distribution | Portable Medical Monitoring Device |
|
Use Scenario: Centralized 24V-to-5V/3.3V conversion feeding multiple sensor nodes and communication modules in factory automation systems. IC Role / Device Role / Timing Role: Robust dual-output controller with remote sensing, overvoltage protection, and latch-off shutdown for fault containment across distributed loads. Use Value: Prevents cascading failures: single short on 3.3V rail triggers localized shutdown without disrupting 5V rail powering critical CAN transceivers. |
Use Scenario: Battery-operated ECG monitor needing ultra-low quiescent current (<25µA) in standby and fast wake-up from sleep mode. IC Role / Device Role / Timing Role: Controller with 20µA shutdown IQ and STBYMD-enabled always-on 3.3V rail for real-time clock and wake-up logic. Use Value: Enables >72-hour battery life in sleep mode while supporting sub-100ms wake-up to full operation via RUN/SS-controlled soft-start. |
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 MOSFETs (40V max VIN, 12A per phase); no separate 3.3V LDO; uses proprietary adaptive on-time control instead of current mode. | Higher integration reduces board area but limits flexibility in MOSFET selection and thermal management; lacks remote sense and PGOOD. | Choose MP2918GL-Z for cost-sensitive, space-constrained designs where fixed 12A output suffices and external MOSFET optimization is unnecessary. |
| LTC3855EUH#PBF | Pin-compatible upgrade with wider VIN (4V–38V), improved ±0.5% output accuracy, enhanced Burst Mode efficiency, and integrated MOSFET drivers supporting higher gate charge. | Supports higher input transients and tighter regulation for next-gen processors; requires same PCB layout but updated compensation components. | Choose LTC3855EUH#PBF when upgrading legacy LTC1628CG#PBF designs for improved accuracy, efficiency, and transient response without layout change. |
Compared with MP2918GL-Z, LTC1628CG#PBF offers discrete MOSFET flexibility and superior remote sensing; compared with LTC3855EUH#PBF, it provides proven reliability in long-lifecycle commercial systems but with slightly lower accuracy and efficiency at light loads.
Availability
LTC1628CG#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 commercial-temperature grade performance.
Supply support for LTC1628CG#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, 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 LTC1628CG#PBF belongs to ADI's legacy Linear Technology Power Management portfolio, designed specifically for high-efficiency, dual-rail DC/DC conversion in portable and battery-critical applications where phase interleaving, low IQ, and robust protection are essential.
FAQ
What is the maximum input voltage rating for the LTC1628CG#PBF?
The LTC1628CG#PBF has an absolute maximum input supply voltage (VIN) rating of 36V. Operation is specified from 3.5V to 36V, making it compatible with 24V industrial buses, 12V automotive systems, and multi-cell Li-ion batteries. Exceeding 36V risks permanent damage to internal circuitry including the INTVCC LDO and gate drivers.
Does the LTC1628CG#PBF include a power good (PGOOD) output?
No, the LTC1628CG#PBF does not include a PGOOD output. That function is exclusive to the LTC1628CG-PG#PBF variant. The LTC1628CG#PBF uses the FLTCPL pin instead, which controls fault coupling between channels. To implement power-good monitoring with LTC1628CG#PBF, external comparators must be used on VOSENSE1/VOSENSE2 signals.
How is switching frequency adjusted on the LTC1628CG#PBF?
Switching frequency on the LTC1628CG#PBF is set via the FREQSET pin, which biases an internal oscillator. With FREQSET open, frequency is ~220kHz; tied to GND, it drops to ~140kHz; driven to 2.4V, it rises to ~310kHz. The relationship is monotonic and specified across temperature, enabling precise EMI tuning without external components.
Can the LTC1628CG#PBF drive external MOSFETs with gate charges exceeding 30nC?
Yes, the LTC1628CG#PBF's TG and BG drivers are rated for peak currents up to 3A and support gate charges beyond 30nC when paired with appropriate gate resistors and layout. Rise/fall times remain under 90ns with 3300pF load, but thermal design and PCB routing must accommodate higher driver dissipation when driving large MOSFETs at high frequency.
What is the purpose of the STBYMD pin on the LTC1628CG#PBF?
The STBYMD pin on the LTC1628CG#PBF provides three-state control: grounded to globally disable both controllers; left open for normal operation; or pulled above 2V to enable the internal 5V and 3.3V standby regulators regardless of RUN/SS state. This enables always-on auxiliary power for RTC or wake-up circuitry while main rails remain off.
LTC1628CG#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#PBF FAQ
1.How can I place an order for LTC1628CG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1628CG#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#PBF reliable?
The price and inventory of LTC1628CG#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#PBF is usually 5 days.
3.What payment methods are accepted for LTC1628CG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1628CG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1628CG#PBF?
LTC1628CG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1628CG#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#PBF?
For technical support, including LTC1628CG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1628CG#PBF requirements.
6.How does Aetrix verify that LTC1628CG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1628CG#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#PBF meets industry standards.
7.What is the process for return or replacement of LTC1628CG#PBF?
All LTC1628CG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1628CG#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#PBF part is unused and in its original packaging.
Return procedure for LTC1628CG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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