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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > LED Drivers

Analog Devices Inc. LT3796IFE-1#PBF

Name: LT3796IFE-1#PBF
Brand: Analog Devices Inc.
SKU: LT3796IFE-1#PBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LT3796IFE-1#PBF

Manufacturer:: Analog Devices Inc.

Category:: LED Drivers

Package:: 28-TSSOP (0.173", 4.40mm Width) Exposed Pad

Datasheet:: LT3796IFE-1#PBF.pdf

Description:: IC LED DRIVER CTRLR PWM 28TSSOP

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Product details

Overview

LT3796IFE-1#PBF from Analog Devices (formerly Linear Technology) is a 100V constant-current/constant-voltage DC/DC controller optimized for dual-string LED driving and high-voltage battery/supercapacitor charging. It features dual current sense amplifiers, programmable analog dimming via CTRL pin (25 mV to 250 mV threshold), 3000:1 true-color PWM dimming, and independent top-gate enable (TGEN) for second-loop control. Used in automotive exterior lighting and industrial high-power LED systems.

For engineers reviewing the LT3796IFE-1#PBF datasheet, LT3796IFE-1#PBF pinout, LT3796IFE-1#PBF application, or LT3796IFE-1#PBF equivalent, key selection criteria include its 28-lead TSSOP package with exposed pad, –40°C to 125°C operating junction temperature, dual FB inputs for CV/CC mode switching, rail-to-rail ISP/ISN common-mode range up to 100 V, and TGEN-controlled PMOS disconnect for secondary current regulation.

Technical Context

The LT3796IFE-1#PBF implements fixed-frequency current-mode control with two independent transconductance error amplifiers (FB1/FB2), each regulating to 1.25 V nominal. Its dual current sensing architecture supports simultaneous LED string regulation and input current monitoring, with ISP/ISN amplifier common-mode range spanning 0 V to 100 V and CSOUT reporting scaled LED current (×4 gain).

Unlike the LT3796, the LT3796-1 variant integrates TGEN (Pin 13) to independently enable/disable the top-gate driver without affecting PWM operation-enabling dynamic deactivation of a second current loop or extension of analog dimming range using an external PMOS switch. The device operates from 6 V to 100 V input and delivers up to 1 MHz switching frequency via RT resistor programming.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	6 V to 100 V - supports wide-range industrial and automotive supply rails including transient-tolerant 85 V LED strings.
Switching Frequency	100 kHz to 1 MHz - adjustable via RT pin resistor; enables optimization of efficiency vs. size trade-offs in high-power designs.
Current Sense Threshold	25 mV to 250 mV - linearly programmable via CTRL pin (0.2 V to 1.2 V), enabling precise analog dimming and C/10 battery charge termination.
ISP/ISN Common-Mode Range	0 V to 100 V - allows high-side current sensing in boost, buck-boost, and SEPIC LED drivers without level-shifting circuitry.
Operating Junction Temp	–40°C to 125°C - qualified for under-hood automotive and industrial ambient environments with thermal shutdown protection.
Package	28-Lead TSSOP with exposed pad - provides low thermal resistance (θJC = 10°C/W) for high-current regulator applications.
VMODE & FAULT Outputs	Open-collector flags - VMODE signals open-LED fault (FB1 > 1.19 V + V(ISP-ISN) < 25 mV); FAULT latches on overvoltage, overcurrent, or INTVCC UVLO.

Pinout & Package

LT3796IFE-1#PBF is housed in a 28-lead plastic TSSOP (FE package) with exposed thermal pad (Pin 29) soldered to PCB ground. Pin functions are validated per Linear Technology's official datasheet (3796fb, Rev. D).

Pin/Terminal	Circuit Role	Design Meaning
ISP (1)	Positive current sense input / TG driver rail	Serves as high-side reference for R_LED; supplies gate drive voltage to external PMOS when V_ISP > 7 V.
ISN (2)	Negative current sense input	Kelvin-connected to R_LED low side; forms differential pair with ISP for accurate LED current measurement.
TG (3)	Top-gate PMOS driver output	Inverted PWM output with internal 7 V clamp; drives series PMOS for high-side disconnect or second-string control.
GND (4,17,21,22,29)	Ground reference / thermal pad	Multiple GND pins reduce noise coupling; exposed pad (Pin 29) must be soldered for thermal performance and EMI control.
ISMON (5)	Current report output	Provides I_LED × R_LED × 4 voltage signal for system-level current monitoring or closed-loop feedback.
FB2 (6)	Voltage loop feedback 2	Regulates to 1.25 V; used for secondary CV loop or overvoltage protection (pulls TG high if driven > 1.3 V).
FB1 (7)	Voltage loop feedback 1	Primary CV/CC mode selector and open-LED detector; asserts VMODE flag when V_FB1 > 1.19 V and V(ISP−ISN) < 25 mV.
VC (8)	Error amplifier output	High-impedance during PWM low; stores demand state for seamless dimming transitions and loop stability.
CTRL (9)	Analog dimming threshold control	Linearly scales full-scale current sense threshold from 25 mV (V_CTRL = 0.2 V) to 250 mV (V_CTRL ≥ 1.2 V).
VREF (10)	2.015 V reference output	Stable reference for CTRL divider or temperature compensation networks; capable of sourcing 100 µA.
SS (11)	Soft-start / fault timer	28 µA pull-up charges external capacitor; fault conditions activate 2.8 µA pull-down to discharge SS and halt switching.
RT (12)	Frequency programming	Resistor to GND sets oscillator frequency; 82.5 kΩ yields 250 kHz, 19.6 kΩ yields 400 kHz, 6.65 kΩ yields 1 MHz.
TGEN (13)	Top-gate enable (LT3796-1 only)	Low signal forces TG high independent of PWM; enables selective deactivation of second current loop or extended analog dimming.
PWM (14)	Digital dimming input	Active-low control: low disables switching, idles oscillator, pulls TG high, and places VC in high-Z storage mode.
FAULT (15)	Open-collector fault flag	Pulled low on FB1 overvoltage (>1.3 V), ISP/ISN overcurrent (>375 mV), INTVCC UVLO (<4 V), or thermal shutdown.
VMODE (16)	Open-collector open-LED flag	Pulled low when FB1 > 1.19 V and V(ISP−ISN) < 25 mV - indicates open-circuit condition in LED string.
SENSE (18)	Switch current sense input	Kelvin-connected to high side of R_SENSE in NMOS source; monitors peak inductor current for current-mode control.
GATE (19)	NMOS gate driver output	Drives external N-channel MOSFET between INTVCC (7.7 V) and GND; fast rise/fall times (20 ns/18 ns) support high-frequency operation.
INTVCC (20)	Internal LDO output	7.7 V regulated supply for gate drivers and internal logic; requires 4.7 µF local bypass; can be tied to VIN if VIN ≤ 7 V.
VIN (23)	Main input supply	Accepts 6 V to 100 V; requires 0.22 µF local ceramic bypass; absolute max rating is 100 V.
EN/UVLO (24)	Enable and undervoltage lockout	1.22 V falling threshold with programmable hysteresis; sub-µA bias current above threshold; pulls down at 3 µA below threshold.
VS (25)	Current sense amplifier supply	3 V to 100 V supply for ISP/ISN amplifier; decoupled internally; enables high-side sensing without auxiliary supply.
CSN (26)	Negative current monitor input	Reference terminal for CSP; functional up to 100 V; typically tied to VS and CSP in servo configuration (Fig. 9).
CSP (27)	Positive current monitor input	Sinks current proportional to V(ISP−ISN)/R_IN1; used with external resistor to generate ISMON or CSOUT signals.
CSOUT (28)	Current sense amplifier output	Sources current equal to I_ISP−ISN × (R_IN2/R_IN1); used for precision input current monitoring up to 100 V.

Key Features

Feature	Design Value
Dual current sense amplifiers	Independent ISP/ISN and CSP/CSN paths enable simultaneous LED current regulation and input current monitoring at up to 100 V.
Programmable analog dimming	CTRL pin adjusts full-scale current threshold from 25 mV to 250 mV with linear response, supporting C/10 battery charge termination.
TGEN-controlled top-gate driver	Pin 13 enables/disables TG output independently of PWM, allowing dynamic reconfiguration of dual-string or dual-loop architectures.
3000:1 true-color PWM dimming	Combines high-resolution digital PWM with analog threshold scaling to preserve color consistency across full brightness range.
Rail-to-rail ISP/ISN common-mode range	0 V to 100 V operation eliminates need for level shifters in high-side LED current sensing, reducing BOM count and layout complexity.
Integrated fault protection	VMODE (open-LED), FAULT (overvoltage, overcurrent, UVLO, thermal), and SENSE current limit (113 mV typ.) provide comprehensive system safety.

Applications

Automotive Exterior Lighting	Industrial High-Power LED Drivers
Use Scenario: Driving multiple high-brightness LED strings in headlamps, fog lamps, or DRLs with strict thermal and EMC requirements. IC Role / Device Role / Timing Role: Constant-current controller managing two independent LED strings via ISP/ISN and TGEN-enabled PMOS disconnect. Use Value: Enables adaptive beam shaping and dynamic dimming while maintaining color fidelity across 3000:1 range and surviving 100 V load-dump transients.	Use Scenario: Powering large-area architectural or horticultural LED arrays requiring stable current regulation and remote monitoring. IC Role / Device Role / Timing Role: Dual-loop regulator using FB1 for primary CC control and FB2 for secondary CV backup, with ISMON reporting for cloud-connected telemetry. Use Value: Delivers ±1.5% LED current accuracy over temperature and line, with integrated open-LED detection eliminating need for external comparators.
Battery & Supercapacitor Chargers	Accurate Current-Limited Voltage Regulators
Use Scenario: Charging 48 V Li-ion packs or 50 V supercapacitor banks with C/10 termination and input current limiting. IC Role / Device Role / Timing Role: Constant-voltage/constant-current charger using CTRL-programmed thresholds and CSP/CSN-based input current regulation. Use Value: Achieves <1% charge current accuracy and automatic transition from CC to CV mode using built-in 1.25 V FB references and C/10 comparator.	Use Scenario: Providing tightly regulated 12 V/24 V outputs for sensitive instrumentation where overcurrent must be limited to exact values. IC Role / Device Role / Timing Role: Precision current-limited CV regulator using FB2 loop and SENSE-based cycle-by-cycle current limiting at 113 mV threshold. Use Value: Guarantees output current never exceeds design limit (e.g., 5 A ±2%) even during short-circuit events, protecting downstream loads.

Automotive Exterior Lighting

Industrial High-Power LED Drivers

Use Scenario: Driving multiple high-brightness LED strings in headlamps, fog lamps, or DRLs with strict thermal and EMC requirements.

IC Role / Device Role / Timing Role: Constant-current controller managing two independent LED strings via ISP/ISN and TGEN-enabled PMOS disconnect.

Use Value: Enables adaptive beam shaping and dynamic dimming while maintaining color fidelity across 3000:1 range and surviving 100 V load-dump transients.

Use Scenario: Powering large-area architectural or horticultural LED arrays requiring stable current regulation and remote monitoring.

IC Role / Device Role / Timing Role: Dual-loop regulator using FB1 for primary CC control and FB2 for secondary CV backup, with ISMON reporting for cloud-connected telemetry.

Use Value: Delivers ±1.5% LED current accuracy over temperature and line, with integrated open-LED detection eliminating need for external comparators.

Battery & Supercapacitor Chargers

Accurate Current-Limited Voltage Regulators

Use Scenario: Charging 48 V Li-ion packs or 50 V supercapacitor banks with C/10 termination and input current limiting.

IC Role / Device Role / Timing Role: Constant-voltage/constant-current charger using CTRL-programmed thresholds and CSP/CSN-based input current regulation.

Use Value: Achieves <1% charge current accuracy and automatic transition from CC to CV mode using built-in 1.25 V FB references and C/10 comparator.

Use Scenario: Providing tightly regulated 12 V/24 V outputs for sensitive instrumentation where overcurrent must be limited to exact values.

IC Role / Device Role / Timing Role: Precision current-limited CV regulator using FB2 loop and SENSE-based cycle-by-cycle current limiting at 113 mV threshold.

Use Value: Guarantees output current never exceeds design limit (e.g., 5 A ±2%) even during short-circuit events, protecting downstream loads.

Equivalent & Alternatives

The following parts are listed as comparable options for similar constant-current/constant-voltage controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LTC3787EMSE#PBF	Single-output synchronous buck-boost controller; no TGEN pin; lacks dual current sense; 40 V max input.	Best suited for lower-voltage, single-string applications without secondary loop control or high-side current monitoring.	Select when cost-sensitive, single-output 12–36 V LED or battery systems require synchronous rectification and smaller footprint.
LT3965EFE#PBF	8-channel LED driver with integrated MOSFETs; 60 V max input; no ISP/ISN high-side sensing; fixed 200 Hz PWM dimming.	Targeted at multi-zone signage or display backlighting with distributed channel control, not high-voltage discrete power stages.	Choose for compact, multi-string designs needing integrated switching and individual channel dimming-not for 100 V industrial LED drivers.

Compared with LTC3787EMSE#PBF and LT3965EFE#PBF, the LT3796IFE-1#PBF uniquely supports 100 V operation, dual independent current loops via TGEN, and rail-to-rail ISP/ISN sensing-making it the only option for high-reliability, high-voltage dual-string LED drivers and precision C/10 battery chargers.

Availability

LT3796IFE-1#PBF is available at Aetrix Electronics and suitable for automotive lighting, industrial LED drivers, and battery charging systems requiring stable component supply, long-term lifecycle support, and guaranteed –40°C to 125°C operation.

Supply support for LT3796IFE-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 acquired Linear Technology in 2017 and maintains full technical and manufacturing continuity for all Linear IC products, including robust qualification and long-term product support.

The LT3796IFE-1#PBF belongs to Linear's high-voltage LED controller family, designed specifically for demanding constant-current applications in automotive, industrial, and energy-storage systems where reliability, precision, and wide input range are critical.

FAQ

What is the maximum input voltage rating for the LT3796IFE-1#PBF?

The LT3796IFE-1#PBF has an absolute maximum input voltage (VIN) rating of 100 V, and its ISP, ISN, CSP, and CSN pins also tolerate up to 100 V common-mode voltage. This enables direct use in 85 V LED string applications and automotive load-dump tolerant designs without external clamping. Operation above 6 V is required for normal startup.

How does the TGEN pin on the LT3796IFE-1#PBF differ from the SYNC pin on the LT3796?

The TGEN pin (Pin 13) on the LT3796IFE-1#PBF is a dedicated top-gate enable signal that forces the TG output high independently of PWM state-allowing dynamic deactivation of a second current loop. In contrast, the SYNC pin on the LT3796 synchronizes the internal oscillator to an external clock and has no gate-control function. TGEN is exclusive to LT3796-1 variants like the LT3796IFE-1#PBF.

Can the LT3796IFE-1#PBF regulate both constant-current and constant-voltage modes simultaneously?

No-the LT3796IFE-1#PBF uses FB1 and FB2 to configure either constant-current (via ISP/ISN) or constant-voltage (via FB1 or FB2) regulation, but not both simultaneously on the same output. However, it supports dual independent outputs: one string regulated by ISP/ISN (CC), and a second string or auxiliary supply regulated by FB2 (CV), coordinated via TGEN control.

What is the purpose of the ISMON pin on the LT3796IFE-1#PBF?

The ISMON pin on the LT3796IFE-1#PBF outputs a voltage equal to I_LED × R_LED × 4, providing a precise, temperature-stable representation of LED current for system-level monitoring, telemetry, or closed-loop feedback. When PWM is low, ISMON is pulled to GND; a 47 nF bypass capacitor is recommended if noise sensitivity is a concern.

Does the LT3796IFE-1#PBF support C/10 battery charge termination?

Yes-the LT3796IFE-1#PBF includes a dedicated C/10 comparator that triggers when V(ISP−ISN) falls to 25 mV (typical) while FB1 = 1.25 V, corresponding to 10% of full-scale charge current. This feature is explicitly documented in the Electrical Characteristics table and enables accurate termination for Li-ion and supercapacitor charging applications.

LT3796IFE-1#PBF Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: True Color PWM™

Package/Case:: 28-TSSOP (0.173", 4.40mm Width) Exposed Pad

Packaging:: Tube

Product Status:: Active

Type:: DC DC Controller

Topology:: SEPIC, Step-Down (Buck), Step-Up (Boost)

Internal Switch(s):: No

Number of Outputs:: 1

Voltage - Supply (Min):: 6V

Voltage - Supply (Max):: 100V

Voltage - Output:: -

Current - Output / Channel:: -

Frequency:: 100kHz ~ 1MHz

Dimming:: Analog, PWM

Applications:: -

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 28-TSSOP-EP

LT3796IFE-1#PBF FAQ

1.How can I place an order for LT3796IFE-1#PBF through Aetrix?

Please submit a Request for Quotation (RFQ) for LT3796IFE-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 LT3796IFE-1#PBF reliable?

The price and inventory of LT3796IFE-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 LT3796IFE-1#PBF is usually 5 days.

3.What payment methods are accepted for LT3796IFE-1#PBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3796IFE-1#PBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LT3796IFE-1#PBF?

LT3796IFE-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LT3796IFE-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 LT3796IFE-1#PBF?

For technical support, including LT3796IFE-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3796IFE-1#PBF requirements.

6.How does Aetrix verify that LT3796IFE-1#PBF is sourced from the original manufacturer or authorized distributors?

All LT3796IFE-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 LT3796IFE-1#PBF meets industry standards.

7.What is the process for return or replacement of LT3796IFE-1#PBF?

All LT3796IFE-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3796IFE-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 LT3796IFE-1#PBF part is unused and in its original packaging.

Return procedure for LT3796IFE-1#PBF:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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