My Inquiry
My Account
Analog Devices Inc. LTC1628CUH#TRPBF
- Part No.:
- LTC1628CUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC1628CUH#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,185
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC1628CUH#TRPBF 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 99.4% duty cycle in dropout, and operates with out-of-phase 180° timing to reduce input capacitance and supply noise - used in high-efficiency 5V/3.3V dual-rail power supplies for notebook computers and portable instrumentation.
For engineers reviewing the LTC1628CUH#TRPBF datasheet, LTC1628CUH#TRPBF pinout, LTC1628CUH#TRPBF application, or LTC1628CUH#TRPBF equivalent, key selection criteria include its dual-channel current-mode control architecture, OPTI-LOOP® compensation, programmable 150–300kHz switching frequency, integrated 5V/3.3V standby regulators, and support for Burst Mode®, forced continuous, or constant-frequency operation.
Technical Context
The LTC1628CUH#TRPBF implements a constant-frequency current-mode control architecture with two independent channels operating 180° out of phase. Each channel features a transconductance error amplifier (gm = 1.3 mmho, GBW = 3 MHz), precision 0.8V feedback reference, and ITH-controlled current limit threshold scaling linearly with ITH voltage (75 mV typ at ITH = 0.7V).
It integrates dual gate drivers (TG/BG) with <90 ns rise/fall times, a dedicated 3.3V LDO (3.25–3.45V, 10mA), internal 5V INTVCC regulator (4.8–5.2V), and EXTVCC switchover logic (4.5–4.7V threshold). Protection includes foldback current limiting, output overvoltage lockout (±7.5%), undervoltage lockout (3.5V), and latchable short-circuit shutdown with RUN/SS-based timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports wide battery chemistries (Li-ion, 12V lead-acid, 24V industrial rails) without external pre-regulation. |
| Output Voltage Accuracy | ±1% - ensures stable core/supply rail compliance for microprocessors and FPGAs requiring tight regulation. |
| Switching Frequency | 150kHz to 300kHz (adjustable via FREQSET) - balances efficiency, EMI, and inductor size for compact DC/DC designs. |
| Duty Cycle Max | 99.4% - enables ultra-low dropout operation down to VIN ≈ VOUT + 0.2V, critical for battery-end-of-life scenarios. |
| Feedback Reference | 0.800V ±0.8% - low-voltage reference reduces divider resistor power loss and improves light-load accuracy. |
| Shutdown IQ | 20µA - enables long-term battery standby in portable systems without compromising wake-up readiness. |
| Current Sense Threshold | 75mV typical (at ITH = 0.7V) - sets precise overcurrent protection with minimal RSENSE power loss (e.g., 0.01Ω yields 7.5A trip). |
Pinout & Package
Package: 32-lead 5mm × 5mm plastic QFN (UH package); exposed pad soldered to SGND for thermal and electrical integrity (θJA = 34°C/W).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VOSENSE1 / VOSENSE2 | Differential remote-sense inputs | Enable Kelvin sensing of each output to reject PCB trace IR drop; required for ±1% accuracy under load. |
| SENSE1+/SENSE1− / SENSE2+/SENSE2− | Current-sense differential inputs | Measure RSENSE voltage drop to regulate peak inductor current; reject common-mode noise up to 5V. |
| TG1/TG2, BG1/BG2 | Top/bottom N-MOSFET gate drivers | Drive external N-channel MOSFETs with fast transitions (<90 ns) and bootstrap-compatible swing (INTVCC referenced). |
| RUN/SS1 / RUN/SS2 | Soft-start & short-circuit timer inputs | Capacitor-programmable ramp controls inrush current; also triggers timed latchoff during sustained overcurrent. |
| FREQSET | Oscillator frequency control | Adjusts switching frequency from 140kHz to 310kHz - open circuit sets 220kHz default for optimal efficiency/size trade-off. |
| FCB | Forced Continuous/Burst Mode select | Pins mode selection: <0.8V → forced continuous; 0.8–2.7V → Burst Mode; >4.3V → constant frequency (Burst inhibit). |
| STBYMD | Standby mode control | Three-state pin: GND = global shutdown; open = normal start; >2V = enable 5V/3.3V standby regulators independently. |
| 3.3VOUT | Dedicated 3.3V linear regulator output | Supplies 10mA DC (50mA peak) for auxiliary circuitry - eliminates need for external LDO in dual-rail systems. |
| PGND / SGND | Power ground / signal ground | Separate grounds prevent noise coupling: PGND carries high di/dt switch currents; SGND routes sensitive analog signals. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual-channel control | Reduces RMS input capacitor current by ~30% and cuts input ripple amplitude vs single-phase, enabling smaller CIN. |
| OPTI-LOOP® compensation | Allows stable loop response across wide range of ceramic output capacitors (47µF–470µF) and ESR (0.5–50mΩ) without redesign. |
| Programmable operating modes | Single-pin (FCB) selection among Burst Mode® (high light-load efficiency), constant frequency (low EMI), or forced continuous (low ripple). |
| Integrated standby regulators | On-chip 5V and 3.3V LDOs eliminate external regulators for MCU wake-up, USB PHY, or I²C peripherals - saves board space and BoM cost. |
| Robust fault protection | Combines foldback current limiting, output OVP (±7.5%), UVLO (3.5V), and latchable short-circuit shutdown with defeat option via RUN/SS pull-up. |
Applications
| High-Efficiency Notebook Power | Battery-Powered Test Equipment |
|---|---|
|
Use Scenario: Dual-rail 5V @ 5A / 3.3V @ 5A power supply in ultraportable notebooks with Li-ion battery input (7–20V). IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing both main system rails with out-of-phase timing to minimize input ripple and thermal stress. Use Value: Achieves >90% efficiency across 10mA–5A load range using Burst Mode®, extends battery runtime, and avoids need for discrete 3.3V LDO. |
Use Scenario: Portable oscilloscope or multimeter requiring clean, isolated 5V and 3.3V rails from 9V or 12V battery with minimal quiescent current. IC Role / Device Role / Timing Role: Primary power controller providing regulated outputs while maintaining <20µA shutdown IQ to preserve battery shelf life. Use Value: Enables >500-hour standby via ultra-low IQ shutdown and integrated 3.3V LDO - eliminates external bias supply. |
| Industrial DC Distribution | Automotive Infotainment Core Supply |
|
Use Scenario: Centralized 24V-to-5V/3.3V conversion module feeding multiple embedded controllers in factory automation PLCs. IC Role / Device Role / Timing Role: High-reliability dual-channel controller with robust OVP, UVLO, and latchable fault protection for unattended operation. Use Value: Prevents system failure from bus transients via ±7.5% PGOOD monitoring (LTC1628-PG variant) and foldback current limiting during short circuits. |
Use Scenario: Core SoC power supply in automotive head unit, accepting 6–16V vehicle battery input with cold-crank tolerance. IC Role / Device Role / Timing Role: Wide-input buck controller supporting 3.5V UVLO and 99.4% max duty cycle to maintain 5V rail during 6V cranking events. Use Value: Ensures uninterrupted operation during engine start via dropout recovery and maintains ±1% accuracy despite battery voltage sag. |
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 |
|---|---|---|---|
| LTC3728CUH#TRPBF | Successor with higher 400kHz max frequency, improved current sense accuracy (±0.5%), and enhanced thermal performance (θJA = 28°C/W). | Targets newer designs requiring tighter current limit tolerance and higher switching density; not pin-compatible due to revised pinout and added SYNC input. | Select when upgrading for higher efficiency at light loads or tighter current monitoring; requires PCB redesign. |
| MP8770GQ-Z | Monolithic dual-phase controller (integrated MOSFETs), 4.5–28V input, fixed 500kHz frequency, no FCB/Burst Mode, lower IQ (15µA shutdown). | Suitable for cost-sensitive, space-constrained applications where external MOSFET flexibility is unnecessary and constant-frequency operation suffices. | Choose for simplified layout and lower BOM count where programmable modes and ultra-wide VIN are not required. |
Compared with LTC3728CUH#TRPBF, the LTC1628CUH#TRPBF offers broader VIN range and proven Burst Mode® efficiency but lacks SYNC capability and has looser current sense tolerance; versus MP8770GQ-Z, it provides superior design flexibility with external MOSFETs and multi-mode operation at the cost of higher layout complexity.
Availability
LTC1628CUH#TRPBF is available at Aetrix Electronics and suitable for notebook computing, portable instrumentation, and industrial DC distribution systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC1628CUH#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC1628CUH#TRPBF belongs to Linear's legacy high-efficiency DC/DC controller family, designed specifically for dual-rail, battery-operated, and wide-input industrial power systems demanding precision regulation and robust fault handling.
FAQ
What is the maximum input voltage rating for the LTC1628CUH#TRPBF?
The LTC1628CUH#TRPBF 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 allows safe use with 24V industrial rails and transient-tolerant 12V automotive systems.
Does the LTC1628CUH#TRPBF include a power-good output?
No, the LTC1628CUH#TRPBF does not include a PGOOD output. That function is exclusive to the LTC1628-PG variants (e.g., LTC1628CUH#TRPBF-PG). The standard LTC1628CUH#TRPBF uses the FLTCPL pin instead, which serves fault coupling control between channels.
How is switching frequency set on the LTC1628CUH#TRPBF?
Switching frequency on the LTC1628CUH#TRPBF is set via the FREQSET pin. With FREQSET left open, the oscillator runs at ~220kHz (typ). Tying FREQSET to GND lowers frequency to ~140kHz; applying 2.4V raises it to ~310kHz. The relationship is linear and documented in the Electrical Characteristics table.
Can the LTC1628CUH#TRPBF drive external N-channel MOSFETs without level-shifting components?
Yes, the LTC1628CUH#TRPBF integrates floating high-side gate drivers (TG1/TG2) and bootstrap circuitry (via BOOST1/BOOST2 pins) that self-generate the required gate voltage above VIN. No external level shifters are needed - only external bootstrap capacitors and Schottky diodes per channel.
What thermal performance can be expected from the LTC1628CUH#TRPBF in a typical 4-layer PCB layout?
In a standard 4-layer PCB with 2 oz copper, 1-in² exposed SGND pad, and proper thermal vias, the LTC1628CUH#TRPBF achieves θJA = 34°C/W. At 1W dissipation, this yields ~34°C rise above ambient - enabling reliable operation up to 85°C ambient without forced airflow when properly laid out.
LTC1628CUH#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- 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:
- 32-QFN (5x5)
LTC1628CUH#TRPBF FAQ
1.How can I place an order for LTC1628CUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1628CUH#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 LTC1628CUH#TRPBF reliable?
The price and inventory of LTC1628CUH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1628CUH#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1628CUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1628CUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1628CUH#TRPBF?
LTC1628CUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1628CUH#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 LTC1628CUH#TRPBF?
For technical support, including LTC1628CUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1628CUH#TRPBF requirements.
6.How does Aetrix verify that LTC1628CUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1628CUH#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 LTC1628CUH#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1628CUH#TRPBF?
All LTC1628CUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1628CUH#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 LTC1628CUH#TRPBF part is unused and in its original packaging.
Return procedure for LTC1628CUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC1628CUH#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…
