My Inquiry
My Account
Analog Devices Inc. LTC1625IGN#TRPBF
- Part No.:
- LTC1625IGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1625IGN#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK/BOOST 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,505
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC1625IGN#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous step-down switching regulator controller that drives external N-channel MOSFETs without requiring a current-sense resistor. It operates from 3.7V to 36V input, delivers adjustable output from 1.19V to VIN, features ±1% 1.19V reference, 150kHz nominal oscillator, and Burst Mode™ operation for high efficiency at light loads - used in notebook power supplies and battery-powered systems.
For engineers reviewing the LTC1625IGN#TRPBF datasheet, LTC1625IGN#TRPBF pinout, LTC1625IGN#TRPBF application, or LTC1625IGN#TRPBF equivalent, key selection criteria include VDS-based current sensing architecture, forced continuous mode control via FCB pin, INTVCC/EXTVCC dual-supply flexibility, 16-lead SSOP package thermal performance (θJA = 130°C/W), and industrial-grade –40°C to +85°C operating range.
Technical Context
The LTC1625IGN#TRPBF implements current-mode control using MOSFET VDS sensing to eliminate RSENSE, with ITH pin voltage (0–2.4V) directly setting peak inductor current threshold. Its internal 5.2V LDO powers gate drivers and logic, while EXTVCC switchover (4.5–4.7V threshold) enables high-efficiency self-biasing from converter outputs.
Synchronization is supported via SYNC pin with 1.5:1 lock range (100–225kHz), and fault protection includes foldback current limiting (150mV → 30mV clamp) and output overvoltage lockout (1.24–1.32V). Burst Mode operation activates when ITH drops below 0.95V, disabling switching until load demand raises ITH above 0.5V hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.7V to 36V - supports wide-input industrial and automotive battery systems without external pre-regulation |
| Output Voltage Range | 1.19V to VIN - enables low-voltage logic rails and high-efficiency near-dropout operation up to 99% duty cycle | Reference Accuracy | ±1% at 1.19V - ensures tight output regulation across temperature and line/load conditions |
| Oscillator Frequency | 135–165kHz (typ. 150kHz) - balances switching loss vs. magnetics size; synchronizable to external clock |
| Shutdown Current | <30µA - extends battery life in portable devices during standby |
| Operating Temp Range | –40°C to +85°C - qualified for industrial and extended-temperature embedded applications |
| Package | 16-lead narrow SSOP (GN) - surface-mount compatible with standard reflow profiles and θJA = 130°C/W |
Pinout & Package
Package: 16-lead narrow plastic SSOP (GN), 0.150" body width, exposed pad not specified, JEDEC MS-013AC compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EXTVCC (1) | INTVCC supply switch input | Enables efficient self-biasing from VOUT or auxiliary rail when ≥4.7V; clamps at 7V max |
| SYNC (2) | Oscillator synchronization input | Accepts external clock (100–225kHz); open or grounded = 150kHz; >1.2V = 225kHz |
| RUN/SS (3) | Enable and soft-start control | Logic-low shutdown (<0.8V); external capacitor sets ramp time (~1s/µF) |
| FCB (4) | Forced continuous mode control | Ground = disable Burst Mode; INTVCC = enable Burst Mode; resistive divider enables secondary-winding regulation |
| ITH (5) | Error amplifier compensation node | 0–2.4V voltage sets peak inductor current threshold; direct interface for loop compensation |
| SGND (6) | Signal ground reference | Return path for feedback network and error amplifier; must be star-connected to COUT (–) |
| VOSENSE (7) | Output voltage feedback input | High-impedance sense node for remote sensing or resistive divider; 10–50nA bias current |
| VPROG (8) | Output voltage selection | Open = adjustable via VOSENSE divider; 0V = 3.3V; INTVCC = 5V - eliminates external programming resistors |
| VIN (16) | Main input supply | 3.7–36V input; requires RC filter (4.7Ω/0.1µF) for >3A applications to suppress noise |
| TK (15) | Top MOSFET Kelvin sense | Direct connection to top MOSFET drain - separates sense path from power VIN to minimize VDS measurement error |
| SW (14) | Switch node | Connects to inductor and bootstrap capacitor (–); swings from ~–0.7V to VIN |
| TG (13) | Top gate driver output | Drives top N-MOSFET gate with swing = INTVCC – diode drop, referenced to SW node |
| BOOST (12) | Bootstrap capacitor (+) terminal | Swings from ~INTVCC – 0.7V to VIN + INTVCC - supplies floating gate drive for high-side MOSFET |
| INTVCC (11) | Internal 5.2V regulator output | Powers gate drivers and internal circuitry; requires ≥4.7µF tantalum decoupling to PGND |
| BG (10) | Bottom gate driver output | Drives bottom N-MOSFET gate between PGND and INTVCC - synchronous rectification control |
| PGND (9) | Power ground return | Source connection for bottom MOSFET, CVCC (–), and CIN (–); separate from SGND to avoid noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE current sensing | Uses MOSFET VDS sensing to eliminate power loss and board space of external sense resistor |
| Dual N-channel synchronous drive | Integrated TG/BG drivers support efficient low-RDS(ON) MOSFETs without external level shifters |
| Programmable fixed-frequency + sync | 150kHz nominal oscillator with 1.5:1 synchronization range enables EMI reduction and multi-rail coordination |
| Forced continuous mode control | FCB pin allows disabling Burst Mode to maintain regulation on secondary windings in flyback-derived topologies |
| Output overvoltage protection | Hardware comparator triggers immediate top-FET turn-off if VOUT exceeds 1.24–1.32V - prevents downstream IC damage |
| Logic-controlled micropower shutdown | IQ < 30µA in shutdown with full functionality retention - critical for battery runtime in portable systems |
Applications
| Notebook Power Supply | Wireless Modem DC/DC |
|---|---|
Use Scenario: Regulating 3.3V/5V rails from 5–28V battery or adapter input in ultraportable notebooks. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-current CPU/I/O power with minimal heat generation. Use Value: 90%+ efficiency at 4.5A load (VIN=10V, VOUT=3.3V) extends battery life; Burst Mode reduces no-load IQ to <30µA. | Use Scenario: Generating stable 3.3V supply for LTE/Wi-Fi baseband and RF sections in compact cellular modems. IC Role / Device Role / Timing Role: High-efficiency step-down controller with precise 1.19V reference ensuring clean digital logic and analog RF supply. Use Value: ±1% reference and <0.2% load regulation maintain signal integrity; SSOP package fits dense PCB layouts. |
| Battery Charger Auxiliary Rail | Distributed Power System |
Use Scenario: Providing isolated 5V auxiliary supply for charger management ICs and status LEDs during fast-charging cycles. IC Role / Device Role / Timing Role: Secondary buck controller powered from main charger output, enabling independent sequencing and fault isolation. Use Value: EXTVCC switchover allows self-biasing from primary rail; FCB pin enables forced continuous mode for stable auxiliary regulation under variable load. | Use Scenario: Local point-of-load regulation in industrial PLC backplanes where 24V bus supplies multiple 3.3V/5V subsystems. IC Role / Device Role / Timing Role: Robust, wide-input buck controller supporting long cable runs and noisy 24V distribution networks. Use Value: 3.7–36V input range tolerates brownouts and surges; –40°C to +85°C rating ensures reliability in uncontrolled environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3850IGN#TRPBF | Higher frequency (50–900kHz), integrated gate drivers, no VDS sensing - requires external RSENSE | Better for compact designs needing >500kHz switching; less suitable for ultra-low-noise or RSENSE-sensitive applications | Select LTC3850IGN#TRPBF when higher switching frequency and tighter layout control are prioritized over sense-resistor elimination. |
| MP2307DN-LF-Z | Integrated power MOSFETs (40V/3A), fixed 500kHz frequency, no synchronization or VDS sensing - monolithic solution | Lower BOM count for ≤3A applications; lacks programmability, Burst Mode, and industrial temp range | Select MP2307DN-LF-Z only for cost-sensitive, low-complexity ≤3A designs where external MOSFET flexibility is unnecessary. |
Compared with LTC3850IGN#TRPBF and MP2307DN-LF-Z, the LTC1625IGN#TRPBF uniquely combines RSENSE-free VDS sensing, Burst Mode efficiency at light loads, and industrial temperature rating - making it optimal for high-reliability, medium-power synchronous buck designs requiring design flexibility and low-noise operation.
Availability
LTC1625IGN#TRPBF is available at Aetrix Electronics and suitable for notebook power supplies, wireless modem DC/DC conversion, and distributed industrial power systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC1625IGN#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 its legacy precision analog and power management product lines with full datasheet, simulation model, and application support.
The LTC1625IGN#TRPBF belongs to Linear's high-efficiency current-mode controller family, designed specifically for synchronous step-down regulation in battery-powered and industrial systems where RSENSE elimination, wide input range, and Burst Mode operation are critical.
FAQ
What is the maximum input voltage rating for the LTC1625IGN#TRPBF?
The LTC1625IGN#TRPBF has an absolute maximum input voltage rating of 36V on the VIN and TK pins. Operation is specified from 3.7V to 36V, with a minimum of 3.9V required at –40°C for industrial-grade parts. Exceeding 36V risks permanent damage per Absolute Maximum Ratings.
Does the LTC1625IGN#TRPBF require an external current-sense resistor?
No, the LTC1625IGN#TRPBF does not require an external current-sense resistor. It uses MOSFET VDS sensing via the TK pin to measure inductor current, eliminating sense-resistor power loss and board area. This architecture is confirmed in the device description, features list, and functional diagram.
How is output voltage programmed on the LTC1625IGN#TRPBF?
The LTC1625IGN#TRPBF supports three output voltage configurations: leaving VPROG open enables adjustment via external resistor divider on VOSENSE; tying VPROG to 0V selects 3.3V output; connecting VPROG to INTVCC selects 5V output. The 1.19V internal reference remains fixed regardless of selection.
What thermal performance can be expected from the LTC1625IGN#TRPBF in SSOP package?
The LTC1625IGN#TRPBF in 16-lead narrow SSOP (GN) package has a junction-to-ambient thermal resistance (θJA) of 130°C/W under standard JEDEC test conditions. This value assumes proper PCB copper area and airflow; actual performance depends on layout, heatsinking, and ambient conditions.
Can the LTC1625IGN#TRPBF synchronize to an external clock, and what is the supported range?
Yes, the LTC1625IGN#TRPBF can synchronize its internal oscillator to an external clock applied to the SYNC pin. It locks over a 1.5:1 frequency range - for example, a nominal 150kHz oscillator accepts external clocks from 100kHz to 225kHz. The SYNC pin threshold is 0.9–1.2V for rising-edge detection.
LTC1625IGN#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck, Boost
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 3.9V ~ 36V
- Frequency - Switching:
- 150kHz
- Duty Cycle (Max):
- 99%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Soft Start
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC1625IGN#TRPBF FAQ
1.How can I place an order for LTC1625IGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1625IGN#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 LTC1625IGN#TRPBF reliable?
The price and inventory of LTC1625IGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1625IGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1625IGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1625IGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1625IGN#TRPBF?
LTC1625IGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1625IGN#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 LTC1625IGN#TRPBF?
For technical support, including LTC1625IGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1625IGN#TRPBF requirements.
6.How does Aetrix verify that LTC1625IGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1625IGN#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 LTC1625IGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1625IGN#TRPBF?
All LTC1625IGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1625IGN#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 LTC1625IGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC1625IGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC1625IGN#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…
