My Inquiry
My Account
Analog Devices Inc. LTC1628IUH#TRPBF
- Part No.:
- LTC1628IUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC1628IUH#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,819
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC1628IUH#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 high-efficiency 5V/3.3V power conversion. It features ±1% output voltage accuracy, 150kHz–300kHz adjustable fixed-frequency operation, and supports 3.5V–36V input range with 99% duty cycle dropout capability. Used in notebook computers and battery-powered digital devices requiring tightly regulated dual-output DC/DC conversion.
For engineers reviewing the LTC1628IUH#TRPBF datasheet, LTC1628IUH#TRPBF pinout, LTC1628IUH#TRPBF application, or LTC1628IUH#TRPBF equivalent, key selection criteria include out-of-phase dual-channel timing to reduce input capacitance, OPTI-LOOP® compensation for wide-range capacitor ESR tolerance, remote voltage sensing, and integrated 3.3V standby LDO delivering 10mA.
Technical Context
The LTC1628IUH#TRPBF implements a constant-frequency current-mode control architecture with two channels operating 180° out of phase-reducing input ripple current and minimizing required input capacitance. Each channel uses an internal 0.8V precision reference, transconductance error amplifier (gm = 1.3 mmho, GBW = 3 MHz), and differential current-sense comparator referenced to ITH voltage.
It integrates dual gate drivers (TG/BG) with <90ns transition times, a dedicated 3.3V linear regulator (±0.5% load regulation), and flexible low-power modes: Burst Mode®, forced continuous, or constant-frequency operation selected via FCB pin. The RUN/SS pins provide combined soft-start timing and short-circuit latchoff with programmable timeout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports all common battery chemistries and industrial DC rails without external pre-regulation. |
| Output Voltage Accuracy | ±1% over line/load/temperature - ensures stable core logic and memory supply compliance for microprocessors. |
| Switching Frequency | 150kHz to 300kHz (adjustable via FREQSET) - balances efficiency, size, and EMI in portable designs. |
| Duty Cycle Max | 99.4% - enables ultra-low dropout operation near VIN ≈ VOUT, critical for battery end-of-discharge. |
| Current Sense Threshold | 62mV to 88mV (adjustable via ITH) - sets precise overcurrent protection with foldback behavior below 70% nominal VOUT. |
| Shutdown Quiescent Current | 20µA - minimizes battery drain during system sleep states in portable instrumentation. |
| 3.3V Standby Regulator | 3.25V–3.45V output, 10mA DC / 50mA peak - powers wake-up circuitry or real-time clocks independently of main converters. |
Pinout & Package
Package: 32-lead 5mm × 5mm plastic QFN (UH package); exposed pad soldered to SGND for thermal and electrical integrity.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VOSENSE1 / VOSENSE2 | Remote feedback input (per channel) | Accepts resistive divider output for precision regulation; rejects PCB trace IR drop in high-current paths. |
| RUN/SS1 / RUN/SS2 | Soft-start & short-circuit timer input | Capacitor-to-ground sets ramp time; falling below 1.0V shuts down respective channel; discharge triggers latchoff on sustained overcurrent. |
| TG1/TG2, BG1/BG2 | Top/bottom N-MOSFET gate drivers | Deliver >3A peak current with <90ns transitions; TG floats on BOOST rail; BG referenced to PGND. |
| ITH1 / ITH2 | Error amplifier output & current limit control | Voltage sets per-channel peak inductor current; directly scales sense threshold from 62mV to 88mV. |
| FREQSET | Oscillator frequency programming | Open = ~220kHz; 0V = ~140kHz; 2.4V = ~310kHz - enables EMI tuning and inductor size optimization. |
| FCB | Mode select & secondary winding control | <0.8V = forced continuous; 0.8–2.7V = Burst Mode®; >4.3V = constant frequency - no external components needed. |
| STBYMD | Standby mode control | Ground = global shutdown; open = normal operation; >2V = enable 3.3V/5V LDOs regardless of RUN/SS state. |
| 3.3VOUT | Integrated linear regulator output | Provides clean, low-noise 3.3V for auxiliary circuits; decoupled internally - eliminates need for external LDO in space-constrained designs. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual-channel operation | Reduces RMS input ripple current by ~70%, allowing smaller, lower-cost input capacitors and easing EMI filtering. |
| OPTI-LOOP® compensation | Enables stable loop response across ceramic, polymer, and electrolytic output capacitors with ESR from 1mΩ to 100mΩ. |
| Programmable soft-start & short-circuit latchoff | Single capacitor per channel sets both startup ramp and fault timeout - simplifies design and improves reliability under overload. |
| Integrated 3.3V/5V standby regulators | Eliminates discrete LDOs for always-on subsystems; 3.3VOUT delivers 10mA with ±2% load regulation over full temperature range. |
| Output overvoltage protection (OVP) | Auto-recovers after ±7.5% excursion by latching bottom MOSFET on until VOUT returns to regulation - prevents damage to downstream ICs. |
| Flexible low-power modes | Burst Mode® achieves >85% efficiency at 1mA load; constant frequency maintains noise predictability down to 1% full load. |
Applications
| Mobile Computing Power | Battery-Powered Instrumentation |
|---|---|
|
Use Scenario: Dual-rail power 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 with 180° phase shift to minimize input ripple. Use Value: Reduces required input capacitance by 50% versus single-phase, extending battery runtime and enabling thinner form factors. |
Use Scenario: Portable multimeter with isolated analog front-end and Bluetooth MCU, powered by 2-cell LiPo (6.4V–8.4V). IC Role / Device Role / Timing Role: Primary DC/DC controller delivering regulated 5V/3.3V while maintaining sub-30µA shutdown current. Use Value: Enables >1-year shelf life on battery; Burst Mode® sustains 92% efficiency at µA-level sensor bias currents. |
| Industrial DC Distribution | Automotive Infotainment |
|
Use Scenario: DIN-rail mounted 24V-to-5V/3.3V converter supplying PLC I/O modules and fieldbus interfaces. IC Role / Device Role / Timing Role: High-voltage tolerant controller (36V max VIN) with remote sensing and OVP protecting sensitive communication ICs. Use Value: Maintains ±1% regulation across –40°C to +85°C ambient; withstands 40V load-dump transients via robust absolute max ratings. |
Use Scenario: Head unit power stage converting 9V–16V automotive battery to 5V USB and 3.3V SoC rails. IC Role / Device Role / Timing Role: Dual-output controller with STBYMD-driven wake-up capability and PGOOD signaling for safe boot sequencing. Use Value: Supports cold-crank operation down to 3.5V VIN; PGOOD (on LTC1628-PG variants) validates both outputs before MCU release. |
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; 4.5V–28V VIN; no standalone 3.3V LDO. | Higher integration but limited to ≤12V input; lacks independent standby regulator for always-on functions. | Prefer MP2918GL-Z when board space is critical and input voltage stays below 28V; choose LTC1628IUH#TRPBF for 36V tolerance and auxiliary LDO. |
| TPS546D24RQFT | Dual-output PMBus-enabled controller with digital loop compensation; 4.5V–18V VIN; requires external EEPROM for configuration. | Supports telemetry and dynamic voltage scaling but adds firmware complexity and BOM cost. | Select TPS546D24RQFT for systems needing real-time telemetry or adaptive voltage scaling; LTC1628IUH#TRPBF suits analog-only, cost-sensitive designs. |
Compared with MP2918GL-Z and TPS546D24RQFT, the LTC1628IUH#TRPBF offers wider input range (3.5V–36V), integrated 3.3V LDO, and analog simplicity-making it optimal for ruggedized portable and industrial applications where digital overhead is unnecessary and voltage margin is critical.
Availability
LTC1628IUH#TRPBF is available at Aetrix Electronics and suitable for notebook computing, battery-operated instrumentation, and industrial DC distribution systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC1628IUH#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC1628IUH#TRPBF belongs to ADI's legacy Linear Technology power management portfolio, designed specifically for high-efficiency, dual-output DC/DC conversion in space- and battery-constrained portable electronics.
FAQ
What is the operating temperature range for the LTC1628IUH#TRPBF?
The LTC1628IUH#TRPBF is rated for –40°C to +85°C ambient operation (I-grade). Its thermal design leverages the 5mm × 5mm QFN package with exposed pad soldered to SGND, achieving θJA = 34°C/W - enabling reliable performance in fanless industrial enclosures and automotive cabin environments without derating up to 85°C.
Does the LTC1628IUH#TRPBF include a power good (PGOOD) output?
No - the LTC1628IUH#TRPBF is the standard version without PGOOD. Only the LTC1628IUH#TRPBF-PG variant includes the open-drain PGOOD pin that asserts low when either VOSENSE1 or VOSENSE2 deviates by more than ±7.5% from its 0.8V reference. For PGOOD functionality, specify the -PG suffix part number.
How does the FCB pin configure low-power modes on the LTC1628IUH#TRPBF?
The FCB pin selects operating mode: <0.8V forces continuous conduction mode; 0.8V–2.7V enables Burst Mode® for highest light-load efficiency; >4.3V disables Burst Mode® for constant-frequency operation. No pull-up/down resistors are needed - direct connection to control logic or filtered voltage suffices.
Can the LTC1628IUH#TRPBF drive external MOSFETs with logic-level gates?
Yes - the TG1/TG2 and BG1/BG2 drivers deliver sufficient peak current (>3A) and voltage swing (BG: 0V to INTVCC; TG: INTVCC–0.5V superimposed on SW node) to fully enhance standard N-channel MOSFETs like the FDS6680A cited in the datasheet. Gate drive strength remains consistent across –40°C to +85°C.
What is the purpose of the STBYMD pin on the LTC1628IUH#TRPBF?
The STBYMD pin provides three-state control: grounded = global shutdown of both controllers; open = normal operation; pulled above 2V = enables the internal 3.3V and 5V LDOs regardless of RUN/SS state - ideal for powering wake-up circuitry or RTCs during deep sleep while main converters are off.
LTC1628IUH#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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
LTC1628IUH#TRPBF FAQ
1.How can I place an order for LTC1628IUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1628IUH#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 LTC1628IUH#TRPBF reliable?
The price and inventory of LTC1628IUH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1628IUH#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1628IUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1628IUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1628IUH#TRPBF?
LTC1628IUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1628IUH#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 LTC1628IUH#TRPBF?
For technical support, including LTC1628IUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1628IUH#TRPBF requirements.
6.How does Aetrix verify that LTC1628IUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1628IUH#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 LTC1628IUH#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1628IUH#TRPBF?
All LTC1628IUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1628IUH#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 LTC1628IUH#TRPBF part is unused and in its original packaging.
Return procedure for LTC1628IUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC1628IUH#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…
