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Analog Devices Inc. LTC3835IGN-1#TRPBF
- Part No.:
- LTC3835IGN-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3835IGN-1#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,149
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Product details
Overview
LTC3835IGN-1#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, low-quiescent-current synchronous step-down DC/DC controller driving dual N-channel MOSFETs. It operates from 4V to 36V input, delivers adjustable output from 0.8V to 10V with ±1% accuracy, and achieves 99% duty cycle for ultra-low dropout-enabling use in automotive battery systems and telecom power supplies.
For engineers reviewing the LTC3835IGN-1#TRPBF datasheet, LTC3835IGN-1#TRPBF pinout, LTC3835IGN-1#TRPBF application, or LTC3835IGN-1#TRPBF equivalent, key selection criteria include its 80μA no-load IQ, phase-lockable 140–650kHz switching frequency, OPTI-LOOP® compensation, output overvoltage protection, and compatibility with 16-lead SSOP packaging for space-constrained industrial power designs.
Technical Context
The LTC3835IGN-1#TRPBF implements a constant-frequency current-mode control architecture with integrated error amplifier, transconductance gm = 1.55 mmho, and precision 0.8V reference. Its ITH pin directly controls peak inductor current via voltage-programmed current limit, while the TRACK/SS pin enables soft-start or supply tracking via internal 1μA pull-up current.
It features three selectable light-load operating modes-Burst Mode® (80μA IQ), pulse-skipping, or forced continuous-determined by the DC voltage on PLLIN/MODE. The device includes dedicated SENSE+ and SENSE− pins for accurate differential current sensing, reverse-current prevention logic, and output overvoltage lockout triggered at +10% VFB deviation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 36V - supports 12V/24V automotive and telecom battery inputs without pre-regulation |
| VOUT Range | 0.8V to 10V - programmable via external resistor divider; ±1% accuracy ensures stable core voltage regulation |
| IQ (No Load) | 80μA - extends runtime in battery-powered digital devices and IoT edge nodes |
| Switching Frequency | 140kHz to 650kHz - phase-lockable to external clock; enables EMI-controlled synchronization across multiple rails |
| Duty Cycle Max | 99.4% - allows operation with VIN as low as ~1.01×VOUT, critical for cold-crank automotive scenarios |
| Output Protection | Overvoltage lockout at +10% VFB - disables top FET and activates bottom FET to clamp transient overshoots |
| Package | 16-Lead Plastic SSOP - surface-mount footprint compatible with standard reflow processes and manual inspection |
Pinout & Package
Package: 16-Lead Plastic SSOP (GN), exposed pad not present; θJA = 90°C/W; operating junction temperature up to 125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PLLIN/MODE | Mode selection & sync input | DC voltage sets light-load mode (Burst/Pulse-Skipping/Continuous); external clock input enables phase-locking between 140–650kHz |
| SENSE+ | Current sense positive input | Connects to high-side of current-sense resistor; common-mode range 0V to 10V enables high-side sensing |
| SENSE− | Current sense negative input | Connects to low-side of current-sense resistor; differential input rejects noise in high-dI/dt paths |
| RUN | Enable/disable control | Pull below 0.7V to shut down entire controller; reduces IQ to 10μA and disables INTVCC regulator |
| TRACK/SS | Soft-start & tracking input | Internal 1μA pull-up charges external capacitor for linear VOUT ramp; also accepts resistor divider for supply tracking |
| VFB | Feedback input | Compares against 0.8V reference; regulates output by adjusting ITH voltage to maintain 0.8V at this pin |
| SGND | Small-signal ground | Must be routed separately from PGND to avoid noise coupling into feedback and error amplifier paths |
| PGND | Power ground | Return path for bottom MOSFET source, Schottky anode, and input capacitor; ties to high-current return plane |
| BG | Bottom gate driver output | Drives synchronous N-MOSFET gate from 0V to INTVCC (5.25V); fast rise/fall times (<90ns) minimize conduction loss |
| INTVCC | Internal LDO output | 5.25V regulated supply for drivers and control logic; requires ≥4.7μF low-ESR capacitor to PGND |
| VIN | Main input supply | Accepts 4–36V; powers internal LDO and provides bootstrap recharge path; bypass capacitor mandatory |
| SW | Switch node | Connects to inductor; voltage swings from −0.3V (Schottky drop) to VIN; critical for layout and EMI control |
| TG | Top gate driver output | Floating driver output referenced to SW; swing = INTVCC − 0.5V above SW; drives high-side N-MOSFET |
| BOOST | Bootstrap supply | Capacitor between BOOST and SW sustains TG drive during high-side conduction; diode to INTVCC enables recharge |
| PLLLPF | PLL loop filter | RC network to SGND sets PLL bandwidth when synchronizing to external clock; floating = 400kHz nominal |
| ITH | Error amplifier output | Controls peak inductor current; voltage range 0.4V–2.0V maps to full current limit scale; used for loop compensation |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Allows stable loop response across wide range of output capacitance (10μF–1000μF) and ESR values without redesigning compensation network |
| Adjustable Light-Load Mode | Selectable Burst Mode® (80μA IQ), pulse-skipping, or forced continuous via single DC voltage on PLLIN/MODE pin |
| Dual N-Channel MOSFET Drive | Integrated high-current TG and BG drivers eliminate need for external level-shifters or gate drivers in synchronous buck designs |
| Output Overvoltage Protection | Hardware-based comparator disables top FET and turns on bottom FET within microseconds if VFB exceeds 0.88V (10% OV) |
| Ultra-Low Dropout Operation | 99.4% max duty cycle enables regulation with VIN only 1% above VOUT-critical for 12V-to-3.3V conversion during automotive cold-crank |
Applications
| Automotive Infotainment Power | Telecom Line Card Supply |
|---|---|
Use Scenario: Powering DSP, FPGA, and memory in head-unit systems with wide battery voltage range (6V–16V) and strict quiescent current limits. IC Role / Device Role / Timing Role: Primary synchronous buck controller regulating 1.2V/3.3V/5V rails from vehicle battery; manages soft-start sequencing and load transients. Use Value: 80μA IQ extends standby time; 99.4% duty cycle maintains regulation during 6.5V cold-crank; ±1% VOUT accuracy ensures reliable logic operation. | Use Scenario: Generating isolated 3.3V and 5V supplies on telecom line cards where EMI compliance and multi-rail synchronization are mandatory. IC Role / Device Role / Timing Role: Synchronous step-down controller synchronized to system clock via PLLIN/MODE to reduce beat frequencies and meet FCC Class B limits. Use Value: Phase-lockable 140–650kHz operation enables deterministic switching alignment; OPTI-LOOP® simplifies compensation across varying board parasitics. |
| Industrial PLC I/O Module | Battery-Powered Test Equipment |
Use Scenario: Providing clean, regulated 3.3V and 5V for analog front-ends and microcontrollers in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: High-reliability DC/DC controller with overvoltage protection and reverse-current blocking for robust field operation. Use Value: Output OVP prevents damage to downstream ADCs during transient faults; SENSE+/− differential sensing rejects noise in electrically noisy factory environments. | Use Scenario: Powering portable oscilloscopes and multimeters powered by Li-ion packs (8.4V–12.6V) requiring long shelf life and precise voltage rails. IC Role / Device Role / Timing Role: Low-IQ synchronous controller delivering 3.3V at up to 5A with programmable soft-start to prevent inrush into large capacitive loads. Use Value: 10μA shutdown IQ preserves battery charge during storage; TRACK/SS pin enables controlled ramp-up to avoid brownout in mixed-signal circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3833IGN#TRPBF | Includes PGOOD and CLKOUT outputs; higher 100μA IQ; same SSOP package and pinout except added functions | Required where power-good signaling or clock distribution is needed; not drop-in due to extra pins and different MODE behavior | Choose LTC3833IGN#TRPBF only if PGOOD status monitoring or clock output is essential; otherwise LTC3835IGN-1#TRPBF offers lower IQ and simpler interface |
| MP2315DJ-LF-Z | Integrated MOSFETs (not controller); fixed 3.3V/5V options; 300kHz fixed frequency; no PLL or TRACK/SS | Suitable for cost-sensitive, low-complexity designs where external FETs and flexibility are unnecessary | Choose MP2315DJ-LF-Z for compact, low-BOM-count solutions; LTC3835IGN-1#TRPBF remains preferred for high-efficiency, high-flexibility, or high-current (>6A) applications requiring discrete FETs |
Compared with LTC3833IGN#TRPBF, the LTC3835IGN-1#TRPBF trades PGOOD/CLKOUT functionality for 20μA lower no-load IQ and simplified mode control; versus MP2315DJ-LF-Z, it provides full external FET control, wider VOUT adjustability, and advanced features like phase-locking and tracking-but requires additional MOSFETs and layout effort.
Availability
LTC3835IGN-1#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, telecom line card power supplies, and industrial PLC I/O modules requiring stable component supply, long-lifecycle support, and guaranteed parametric performance over –40°C to +85°C.
Supply support for LTC3835IGN-1#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 power management semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3835-1 belongs to ADI's high-efficiency synchronous controller product line, designed specifically for demanding industrial, automotive, and telecom power conversion applications where low quiescent current, wide input range, and robust protection features are critical.
FAQ
What is the maximum duty cycle supported by the LTC3835IGN-1#TRPBF?
The LTC3835IGN-1#TRPBF supports a maximum duty cycle of 99.4%, enabling ultra-low dropout operation where input voltage may approach the output voltage-such as during automotive cold-crank events. This specification is confirmed in the Electrical Characteristics table under "DFMAX" and applies across the full –40°C to +85°C operating temperature range.
Does the LTC3835IGN-1#TRPBF include built-in output overvoltage protection?
Yes, the LTC3835IGN-1#TRPBF includes hardware-based output overvoltage protection. When the VFB pin voltage exceeds 0.88V (i.e., +10% of the 0.8V reference), the top MOSFET is immediately disabled and the bottom MOSFET is turned on to clamp the output. This behavior is documented in the Applications Information section and verified in functional testing per the datasheet.
How does the TRACK/SS pin function on the LTC3835IGN-1#TRPBF?
The TRACK/SS pin on the LTC3835IGN-1#TRPBF serves dual purposes: it enables soft-start via an internal 1μA pull-up current charging an external capacitor, or supply tracking via an external resistor divider. During startup, the controller regulates VFB to the smaller of 0.8V or the TRACK/SS voltage-ensuring monotonic, controlled VOUT ramp-up without overshoot.
What are the light-load operating modes available on the LTC3835IGN-1#TRPBF?
The LTC3835IGN-1#TRPBF supports three configurable light-load modes via the PLLIN/MODE pin: Burst Mode® (IQ = 80μA), pulse-skipping, or forced continuous conduction. Pulling PLLIN/MODE below 0.7V selects Burst Mode®, tying to INTVCC forces continuous mode, and applying 0.9V–(INTVCC − 0.5V) enables pulse-skipping-each validated in the Electrical Characteristics and Applications sections.
Is the LTC3835IGN-1#TRPBF pin-compatible with other members of the LTC3835 family?
No-the LTC3835IGN-1#TRPBF is not pin-compatible with the standard LTC3835 (e.g., LTC3835EGN#TRPBF), as it omits CLKOUT, EXTVCC, and PGOOD pins. The pin count is identical (16-lead SSOP), but signal mapping differs: PLLIN/MODE replaces CLKOUT, and RUN replaces EXTVCC. This difference is explicitly detailed in the "Comparison of LTC3835 and LTC3835-1" table in the datasheet.
LTC3835IGN-1#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
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 36V
- Frequency - Switching:
- 250kHz ~ 530kHz
- Duty Cycle (Max):
- 99.4%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC3835IGN-1#TRPBF FAQ
1.How can I place an order for LTC3835IGN-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3835IGN-1#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 LTC3835IGN-1#TRPBF reliable?
The price and inventory of LTC3835IGN-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3835IGN-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3835IGN-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3835IGN-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3835IGN-1#TRPBF?
LTC3835IGN-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3835IGN-1#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 LTC3835IGN-1#TRPBF?
For technical support, including LTC3835IGN-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3835IGN-1#TRPBF requirements.
6.How does Aetrix verify that LTC3835IGN-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3835IGN-1#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 LTC3835IGN-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3835IGN-1#TRPBF?
All LTC3835IGN-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3835IGN-1#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 LTC3835IGN-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3835IGN-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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