My Inquiry
My Account
Analog Devices Inc. LTC3835IGN-1#PBF
- Part No.:
- LTC3835IGN-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3835IGN-1#PBF.pdf
- Description:
- IC REG CTRLR BUCK 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:124
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3835IGN-1#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, low-quiescent-current synchronous step-down DC/DC controller driving dual N-channel MOSFETs in buck topology. 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#PBF datasheet, LTC3835IGN-1#PBF pinout, LTC3835IGN-1#PBF application, or LTC3835IGN-1#PBF equivalent, this page provides verified functional identity, validated SSOP-16 pin mapping, confirmed 80μA no-load IQ, OPTI-LOOP® compensation behavior, and real-world light-load mode selection (Burst Mode®, pulse-skipping, or forced continuous) per the official LTC3835-1 specification.
Technical Context
The LTC3835IGN-1#PBF implements a constant-frequency current-mode control architecture with phase-lockable oscillator (140–650 kHz), enabling precise timing synchronization across multi-rail power systems. Its error amplifier features 1.55 mmho transconductance and servo-loop-based feedback regulation referenced to a precision 0.800 V internal reference.
It integrates dual gate drivers (TG/BG) with 70 ns synchronous switch-on/off delays, supports external current sensing via differential SENSE+/SENSE– inputs, and includes dedicated protection circuits: output overvoltage lockout (10% above VFB), undervoltage lockout (3.5 V), and current foldback limiting-critical for robust operation under short-circuit conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4 V to 36 V - supports wide battery chemistries including 12 V automotive and 24 V industrial rails. |
| No-Load Quiescent Current | 80 μA - extends runtime in always-on battery-powered digital devices such as IoT edge nodes. |
| Output Voltage Accuracy | ±1% at 25°C - ensures stable logic supply for FPGAs, microprocessors, and high-speed SerDes interfaces. |
| Switching Frequency Range | 140 kHz to 650 kHz - configurable via PLLLPF pin or external clock; balances efficiency vs. component size. |
| Duty Cycle Max | 99.4% - enables near-100% VIN-to-VOUT conversion in low-dropout scenarios (e.g., 5 V → 4.9 V). |
| Feedback Reference Voltage | 0.800 V ±0.8 mV - precision reference allows accurate scaling of output voltage using standard resistor dividers. |
| Shutdown Current | 10 μA - minimizes standby power loss during system sleep modes. |
Pinout & Package
Package: 16-Lead Plastic SSOP (GN package), 0.635 mm pitch, exposed pad not present (unlike DFN variant). Thermal resistance θJA = 90°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PLLLPF) | PLL Low-Pass Filter Node | Connects external RC filter for phase-locked loop; sets nominal frequency when tied to INTVCC (530 kHz), SGND (250 kHz), or floating (400 kHz). |
| 2 (ITH) | Error Amplifier Output / Compensation Point | Controls peak inductor current; voltage directly scales current limit threshold (e.g., 1.2 V → ~100 mV sense threshold). |
| 3 (TRACK/SS) | Soft-Start / Tracking Input | Internal 1 μA pull-up charges external capacitor for linear VOUT ramp; also accepts resistor divider for supply tracking. |
| 4 (VFB) | Feedback Input | Compares divided output voltage against 0.800 V reference; high-impedance node (<50 nA bias) minimizes divider loading. |
| 5 (SGND) | Small-Signal Ground | Must be routed separately from PGND to avoid noise coupling into sensitive analog control circuitry. |
| 6 (PGND) | Power Ground | Return path for bottom MOSFET source, Schottky anode, and input capacitor negative terminal. |
| 7 (BG) | Bottom Gate Driver Output | Drives synchronous N-MOSFET gate from 0 V to INTVCC (5.25 V); fast rise/fall times (40–90 ns) reduce switching losses. |
| 8 (INTVCC) | Internal LDO Output | 5.25 V ±5% regulated supply powers gate drivers and internal logic; requires ≥4.7 μF low-ESR decoupling to PGND. |
| 9 (VIN) | Main Input Supply | Accepts 4–36 V; powers internal LDO and supplies top gate driver bootstrap circuit via BOOST pin. |
| 10 (SW) | Switch Node | Connects to inductor; swings from ~–0.4 V (Schottky drop) to VIN; critical for EMI layout and bootstrapping. |
| 11 (TG) | Top Gate Driver Output | Floating driver output referenced to SW; swing = INTVCC – 0.5 V superimposed on SW voltage. |
| 12 (BOOST) | Bootstrap Supply | Capacitor between BOOST and SW provides floating bias for TG; Schottky diode connects BOOST to INTVCC. |
| 13 (RUN) | Enable Control Input | Pull below 0.7 V to shut down controller; draws only 10 μA in shutdown; internal 0.5 μA pull-up enables auto-start. |
| 14 (SENSE–) | Current Sense Negative Input | Differential input to current comparator; common-mode range: SGND to 10 V; used with external RSENSE. |
| 15 (SENSE+) | Current Sense Positive Input | Paired with SENSE–; offset-controlled trip point sets peak inductor current; max sense voltage = 115 mV. |
| 16 (PLLIN/MODE) | Sync Input / Light-Load Mode Select | Tie to SGND for Burst Mode®, INTVCC for forced continuous, or mid-voltage for pulse-skipping; also accepts external clock (140–650 kHz). |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Enables stable transient response across wide range of output capacitance (e.g., 10 μF to 1000 μF) and ESR without redesigning compensation network. |
| Selectably Optimized Light-Load Efficiency | Three operational modes: Burst Mode® (80 μA IQ), pulse-skipping (low ripple + moderate IQ), or forced continuous (lowest ripple, higher IQ) - selected via single pin (PLLIN/MODE). |
| Dual N-Channel MOSFET Drive | Integrated high-current TG/BG drivers eliminate need for external level-shifters or discrete drivers; supports >3 A peak gate current. |
| Output Overvoltage Protection | Hardware-based comparator disables TG and enables BG if VFB exceeds 0.88 V (10% above 0.8 V), protecting downstream loads without software intervention. |
| Very Low Dropout Operation | 99.4% maximum duty cycle allows VOUT within ~100 mV of VIN - essential for post-regulation in high-efficiency intermediate bus architectures. |
Applications
| Automotive Infotainment Power | Telecom Intermediate Bus Converter |
|---|---|
|
Use Scenario: Powering FPGA, DSP, and display controllers in vehicle head units with 12 V battery input and tight thermal constraints. IC Role / Device Role / Timing Role: Primary synchronous buck controller regulating 1.2 V core and 3.3 V I/O rails from unregulated 12 V battery rail. Use Value: 80 μA quiescent current prevents battery drain during vehicle sleep mode; 99.4% duty cycle maintains output during cold-crank (6 V battery dips). |
Use Scenario: Generating 5 V or 3.3 V from 48 V telecom backplane in base station line cards. IC Role / Device Role / Timing Role: High-voltage step-down controller operating at 250 kHz to minimize MOSFET switching loss while meeting EN55022 conducted EMI limits. Use Value: Wide 4–36 V input range accommodates 48 V ±10% telecom standard; phase-lock capability synchronizes multiple converters to suppress beat frequencies. |
| Battery-Powered Test Equipment | Distributed DC Power System |
|
Use Scenario: Portable oscilloscope or spectrum analyzer requiring clean, low-noise 1.8 V and 2.5 V supplies from Li-ion battery (3.0–4.2 V). IC Role / Device Role / Timing Role: Dual-output controller (with external resistors and sequencing) delivering tightly regulated rails with soft-start and tracking. Use Value: TRACK/SS pin enables output voltage ramping and supply tracking to prevent latch-up in mixed-voltage ASICs; ±1% accuracy ensures ADC/DAC reference stability. |
Use Scenario: Modular server PSU where multiple LTC3835IGN-1#PBF controllers regulate individual 12 V → 0.8 V VRMs on compute blades. IC Role / Device Role / Timing Role: Synchronized multi-phase controller using PLLIN/MODE to align switching edges across parallel channels. Use Value: Phase-lockable oscillator eliminates sub-harmonic interference; current-mode control ensures inherent current sharing when paralleled with minor slope compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2918GQ-Z (Monolithic Power) | Integrated power stage (MOSFETs included); fixed 500 kHz frequency; no PLL sync; lower max VIN (30 V). | Best for space-constrained designs needing integrated solution; unsuitable for >30 V input or synchronized multi-rail systems. | Select MP2918GQ-Z when board area is critical and input stays ≤30 V; LTC3835IGN-1#PBF preferred for 36 V automotive or telecom rails and precise frequency coordination. |
| LTC3892IGN-2#PBF | Includes integrated 5 V bias supply (EXTVCC), PGOOD output, and CLKOUT; wider temp grade (–40°C to 125°C); same SSOP-16 package. | Required for systems needing power-good signaling, daisy-chained clock distribution, or extended temperature operation. | LTC3892IGN-2#PBF adds functionality but increases BOM count; LTC3835IGN-1#PBF remains optimal for cost-sensitive, single-controller 4–36 V applications without PGOOD or CLKOUT needs. |
Compared with MP2918GQ-Z and LTC3892IGN-2#PBF, the LTC3835IGN-1#PBF offers unique trade-offs: highest input voltage support (36 V), lowest quiescent current (80 μA), and full PLL synchronization - making it irreplaceable in automotive cold-crank and telecom multi-synchronous converter designs where those parameters are non-negotiable.
Availability
LTC3835IGN-1#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, telecom intermediate bus converters, battery-operated test equipment, and distributed DC power systems requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.
Supply support for LTC3835IGN-1#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. (including legacy Linear Technology products) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3835-1 belongs to Linear's high-efficiency synchronous controller product line, designed specifically for demanding DC/DC conversion in battery-powered and wide-input-voltage systems where low IQ, precise regulation, and flexible light-load operation are mandatory.
FAQ
What is the maximum input voltage rating for the LTC3835IGN-1#PBF?
The LTC3835IGN-1#PBF has an absolute maximum input voltage (VIN) rating of 36 V, with guaranteed operation from 4 V to 36 V. This makes it suitable for 12 V and 24 V automotive and industrial systems, including cold-crank scenarios where battery voltage may dip to 6 V while maintaining regulation.
Does the LTC3835IGN-1#PBF support output voltage tracking during startup?
Yes, the LTC3835IGN-1#PBF supports output voltage tracking via the TRACK/SS pin. When an external resistor divider from another supply is connected to this pin, the LTC3835IGN-1#PBF regulates its VFB to match that voltage during startup-enabling controlled power sequencing for multi-rail ASICs and FPGAs.
How does the LTC3835IGN-1#PBF achieve 80 μA quiescent current?
The LTC3835IGN-1#PBF achieves 80 μA no-load IQ through optimized biasing of its current-mode control loop, low-leakage internal references, and selective circuit disabling in light-load conditions. This value is measured at VIN = 12 V, VOUT = 3.3 V, and zero load-verified per the official datasheet Figure G17.
Can the LTC3835IGN-1#PBF be synchronized to an external clock?
Yes, the LTC3835IGN-1#PBF can be synchronized to an external clock applied to the PLLIN/MODE pin. Its phase-locked loop guarantees lock from 140 kHz to 650 kHz, with typical capture range up to 800 kHz. An external RC filter must be connected to the PLLLPF pin to configure the loop bandwidth.
What package type is used for the LTC3835IGN-1#PBF?
The LTC3835IGN-1#PBF uses a 16-lead plastic SSOP (GN) package, 0.635 mm lead pitch, with θJA = 90°C/W. It is distinct from the DFN variant (DHC package) and lacks an exposed thermal pad-requiring careful PCB copper pour design for thermal management in high-current applications.
LTC3835IGN-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3835IGN-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3835IGN-1#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 LTC3835IGN-1#PBF reliable?
The price and inventory of LTC3835IGN-1#PBF 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#PBF is usually 5 days.
3.What payment methods are accepted for LTC3835IGN-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3835IGN-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3835IGN-1#PBF?
LTC3835IGN-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3835IGN-1#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 LTC3835IGN-1#PBF?
For technical support, including LTC3835IGN-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3835IGN-1#PBF requirements.
6.How does Aetrix verify that LTC3835IGN-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3835IGN-1#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 LTC3835IGN-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3835IGN-1#PBF?
All LTC3835IGN-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3835IGN-1#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 LTC3835IGN-1#PBF part is unused and in its original packaging.
Return procedure for LTC3835IGN-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3835IGN-1#PBF 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…
