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

Analog Devices Inc. LT3796HFE-1#PBF

Name: LT3796HFE-1#PBF
Brand: Analog Devices Inc.
SKU: LT3796HFE-1#PBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LT3796HFE-1#PBF

Manufacturer:: Analog Devices Inc.

Category:: LED Drivers

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

Datasheet:: LT3796HFE-1#PBF.pdf

Description:: IC LED DRIVER CTRLR PWM 28TSSOP

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Product details

Overview

LT3796HFE-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 PMOS-based second-loop control. It operates across 6V–100V input with 100 kHz–1 MHz adjustable switching frequency.

For engineers reviewing the LT3796HFE-1#PBF datasheet, LT3796HFE-1#PBF pinout, LT3796HFE-1#PBF application, or LT3796HFE-1#PBF equivalent, key selection considerations include its –40°C to 150°C junction-rated TSSOP-28 package, rail-to-rail ISP/ISN common-mode range up to 100 V, dual FB pins for CV/CC mode arbitration, and TGEN-controlled second current loop activation-critical for high-reliability industrial LED lighting and energy storage systems.

Technical Context

The LT3796HFE-1#PBF implements a fixed-frequency current-mode architecture with two independent transconductance error amplifiers (FB1/FB2), each regulating to 1.25 V nominal. Its dual current sensing supports simultaneous LED string regulation and input current monitoring (via ISMON), while the TGEN pin enables hardware-gated activation of the second current loop without affecting PWM timing or oscillator state.

It integrates a 7.7 V LDO (INTVCC) with 85 mA current limit, a rail-to-rail ISP/ISN amplifier (0–100 V common mode), and a dedicated top-gate driver (TG) with 7 V clamp for PMOS gate protection. The CTRL pin linearly scales full-scale current sense threshold from 25 mV to 250 mV, enabling precise analog dimming and thermal derating.

Key Specifications

Parameter	Value and Actual Design Meaning
Operating Junction Temp	–40°C to +150°C - qualified for under-hood automotive, industrial LED drivers, and high-temp battery chargers
Input Voltage Range	6 V to 100 V - supports wide-range industrial power inputs and transient-tolerant LED bus architectures
Switching Frequency	100 kHz to 1 MHz - adjustable via RT resistor; enables optimization of EMI, efficiency, and inductor size
Current Sense Threshold	25 mV to 250 mV (programmable via CTRL) - enables precise analog dimming and temperature-compensated LED current control
ISP/ISN Common Mode	0 V to 100 V - allows high-side current sensing in boost, buck-boost, and SEPIC LED topologies
FB1/FB2 Regulation Voltage	1.25 V ±10 mV - provides stable voltage feedback reference for constant-voltage regulation or open-LED detection
TGEN Function	Hardware-enabled second current loop - activates/deactivates second regulation path independently of PWM, supporting dual-string or backup-mode operation

Pinout & Package

LT3796HFE-1#PBF is housed in a 28-lead plastic TSSOP package with exposed pad (Pin 29 = GND). Thermal performance: θ_JA = 30°C/W, θ_JC = 10°C/W, T_JMAX = 150°C. Exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.

Pin/Terminal	Circuit Role	Design Meaning
ISP (1)	Positive current sense input / TG driver supply rail	Serves as high-side current sense node and power rail for top-gate driver; supports up to 100 V common mode
ISN (2)	Negative current sense input	Completes ISP/ISN differential pair; Kelvin-connected to R_LED low side for accurate current measurement
TG (3)	Top-gate PMOS driver output	Drives external PMOS disconnect switch; clamped to ISP − 7 V to protect gate oxide
GND (4,17,21,22,29)	Ground reference / current sense return	Multiple GND pins reduce noise coupling; exposed pad (29) is mandatory thermal/electrical connection
ISMON (5)	Current report output	Provides I_LED × R_LED × 4 voltage signal for system-level current monitoring or telemetry
FB2 (6)	Secondary voltage feedback input	Regulates secondary output to 1.25 V; on LT3796-1, triggers TG high and GATE low if driven >1.3 V for overvoltage protection
FB1 (7)	Primary voltage feedback / open-LED detector	Regulates primary output or detects open-circuit condition; asserts VMODE flag when V_FB1 >1.19 V and V_ISP−ISN <25 mV
VC (8)	Error amplifier output	Integrates error signal for loop stability; high-impedance during PWM low to retain demand state
CTRL (9)	Analog dimming threshold control	Linearly sets full-scale current sense threshold (25–250 mV); tied to VREF for default 250 mV setting
VREF (10)	2.015 V precision reference	Stable internal reference for CTRL biasing and external circuitry; supplies ≤100 µA
SS (11)	Soft-start / fault timer	Charged by 28 µA source; discharged by 2.8 µA sink during faults; requires discharge below 0.2 V to restart
RT (12)	Frequency programming input	Resistor-to-GND sets switching frequency per published curve; no internal pull-up/down
TGEN (13)	Top-gate enable (LT3796-1 only)	Low-active signal forces TG high to disable second current loop; does not idle oscillator or affect PWM behavior
PWM (14)	Digital dimming input	Active-low signal disables switching, idles oscillator, and pulls TG high; supports 3000:1 dimming ratio
FAULT (15)	Open-collector fault indicator	Pulled low on FB1 overvoltage, INTVCC UVLO, LED overcurrent (>375 mV), or thermal shutdown
VMODE (16)	Open-collector open-LED flag	Pulled low when FB1 >1.19 V and V_ISP−ISN <25 mV; latched during PWM low for reliable fault capture
SENSE (18)	NMOS switch current sense input	Kelvin-connected to high side of R_SENSE; monitors peak switch current for cycle-by-cycle limiting
GATE (19)	NMOS gate driver output	Drives external N-channel MOSFET between INTVCC and GND; pulled low during fault/idle
INTVCC (20)	Internal LDO output (7.7 V)	Supplies gate drivers and internal circuitry; requires ≥4.7 µF local bypass; connect to VIN if VIN ≤7 V
VIN (23)	Main input supply	Accepts 6–100 V; requires ≥0.22 µF local ceramic bypass; transient-rated to 100 V
EN/UVLO (24)	Enable / undervoltage lockout	1.22 V falling threshold with user-programmable hysteresis; pulls 3 µA below threshold for resistor-divider design
VS (25)	Current sense amplifier supply	Power rail for ISP/ISN amplifier; operates from 3–100 V; decoupled internally
CSN (26)	Negative current sense amplifier input	Reference terminal for CSP; typically tied to VS and GND in standard configurations
CSP (27)	Positive current sense amplifier input	Sinks current to CSN; used with external resistor to generate proportional ISMON output
CSOUT (28)	Current sense amplifier output	Sources current proportional to V_CSP−CSN; connected to external resistor for voltage output

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 up to 100 V
Programmable analog dimming	CTRL pin adjusts full-scale current threshold from 25 mV to 250 mV, enabling linear thermal derating and closed-loop brightness control
TGEN-controlled second loop	Hardware-enables/disables second current regulation path without disrupting PWM timing-ideal for redundant LED strings or hybrid charging modes
100 V tolerant ISP/ISN inputs	Supports high-side current sensing in boost, flyback, and SEPIC topologies without level-shifting, reducing BOM count and layout complexity
True-color PWM dimming	3000:1 dimming ratio preserves color consistency across intensity levels-critical for architectural and medical LED applications
Integrated fault protection	Combines open-LED (VMODE), overcurrent (FAULT), overvoltage (FB1/FB2), thermal shutdown, and INTVCC UVLO with latched reporting

Applications

High-Power Dual-String LED Lighting	Industrial Battery & Supercapacitor Charging
Use Scenario: Outdoor streetlights with redundant LED strings requiring independent current regulation and thermal management. IC Role / Device Role / Timing Role: LT3796HFE-1#PBF acts as dual-loop CC/CV controller, using ISP/ISN for primary string regulation and TGEN-activated second loop for backup string or adaptive dimming. Use Value: Enables fail-operational lighting via hardware-gated second loop; 150°C rating ensures reliability in sealed, high-ambient enclosures.	Use Scenario: 48 V telecom battery backup system with supercapacitor-assisted cold-cranking support. IC Role / Device Role / Timing Role: LT3796HFE-1#PBF regulates charging current/voltage for both battery and supercapacitor banks, using FB1 for CV termination and C/10 detection via VMODE. Use Value: Single-controller solution eliminates separate charge ICs; 100 V ISP/ISN tolerance accommodates full battery stack voltage plus surge margin.
High-Voltage Constant-Current Power Supplies	Automotive LED Headlamp Drivers
Use Scenario: Precision lab-grade CC power supply for semiconductor test fixtures requiring 0.5% current accuracy over 10–100 V output range. IC Role / Device Role / Timing Role: LT3796HFE-1#PBF serves as primary CC regulator with SENSE-based cycle-by-cycle limiting and FB2-based CV clamping. Use Value: Dual FB pins allow seamless transition between CC and CV modes; 150°C rating supports convection-cooled bench designs.	Use Scenario: Adaptive front-lighting system (AFS) headlamps with matrix LED arrays requiring individual zone dimming and fault isolation. IC Role / Device Role / Timing Role: LT3796HFE-1#PBF controls high-side current for multiple LED zones, using PWM for dynamic beam shaping and VMODE for open-circuit diagnostics. Use Value: 3000:1 true-color PWM ensures consistent chromaticity across all beam patterns; AEC-Q200-compatible thermal grade supports under-hood placement.

High-Power Dual-String LED Lighting

Industrial Battery & Supercapacitor Charging

Use Scenario: Outdoor streetlights with redundant LED strings requiring independent current regulation and thermal management.

IC Role / Device Role / Timing Role: LT3796HFE-1#PBF acts as dual-loop CC/CV controller, using ISP/ISN for primary string regulation and TGEN-activated second loop for backup string or adaptive dimming.

Use Value: Enables fail-operational lighting via hardware-gated second loop; 150°C rating ensures reliability in sealed, high-ambient enclosures.

Use Scenario: 48 V telecom battery backup system with supercapacitor-assisted cold-cranking support.

IC Role / Device Role / Timing Role: LT3796HFE-1#PBF regulates charging current/voltage for both battery and supercapacitor banks, using FB1 for CV termination and C/10 detection via VMODE.

Use Value: Single-controller solution eliminates separate charge ICs; 100 V ISP/ISN tolerance accommodates full battery stack voltage plus surge margin.

High-Voltage Constant-Current Power Supplies

Automotive LED Headlamp Drivers

Use Scenario: Precision lab-grade CC power supply for semiconductor test fixtures requiring 0.5% current accuracy over 10–100 V output range.

IC Role / Device Role / Timing Role: LT3796HFE-1#PBF serves as primary CC regulator with SENSE-based cycle-by-cycle limiting and FB2-based CV clamping.

Use Value: Dual FB pins allow seamless transition between CC and CV modes; 150°C rating supports convection-cooled bench designs.

Use Scenario: Adaptive front-lighting system (AFS) headlamps with matrix LED arrays requiring individual zone dimming and fault isolation.

IC Role / Device Role / Timing Role: LT3796HFE-1#PBF controls high-side current for multiple LED zones, using PWM for dynamic beam shaping and VMODE for open-circuit diagnostics.

Use Value: 3000:1 true-color PWM ensures consistent chromaticity across all beam patterns; AEC-Q200-compatible thermal grade supports under-hood placement.

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; max 60 V input; no dual ISP/ISN sensing	Targeted at lower-voltage DC-DC conversion (e.g., 12 V–24 V systems); lacks 100 V tolerance and dual-string capability	Select LTC3787EMSE#PBF only for cost-sensitive, single-output 24 V applications where 100 V tolerance and dual-loop control are unnecessary
LT3762EFE#PBF	Single-output LED controller; no TGEN; no second FB pin; 60 V max input; no ISMON reporting	Optimized for single-string boost LED drivers; missing dual-string coordination and input current telemetry	Choose LT3762EFE#PBF for simpler, lower-cost single-string LED applications where 150°C operation and dual-loop control are not required

Compared with LTC3787EMSE#PBF and LT3762EFE#PBF, the LT3796HFE-1#PBF uniquely delivers 100 V ISP/ISN tolerance, hardware-gated dual-loop control via TGEN, and integrated ISMON current reporting-making it the only option qualified for high-reliability, high-voltage dual-string LED and energy storage systems operating up to 150°C junction temperature.

Availability

LT3796HFE-1#PBF is available at Aetrix Electronics and suitable for high-power LED lighting, industrial battery charging, and automotive headlamp driver applications requiring stable component supply, extended temperature operation, and long-term lifecycle continuity.

Supply support for LT3796HFE-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 product support, documentation, and manufacturing continuity for the LT3796 family.

The LT3796HFE-1#PBF belongs to Linear's high-voltage LED controller product line, designed specifically for robust, thermally demanding constant-current applications in industrial, automotive, and energy infrastructure systems.

FAQ

What is the maximum operating junction temperature for the LT3796HFE-1#PBF?

The LT3796HFE-1#PBF is rated for a maximum junction temperature of +150°C, verified across the full –40°C to +150°C operating range. This H-grade qualification makes LT3796HFE-1#PBF suitable for under-hood automotive lighting, sealed industrial LED fixtures, and high-ambient battery charging systems where thermal derating is critical. The device includes thermal shutdown protection that asserts FAULT when T_J exceeds safe limits.

How does the TGEN pin function differently on the LT3796HFE-1#PBF compared to the SYNC pin on the LT3796HFE#PBF?

The TGEN pin on LT3796HFE-1#PBF is a dedicated hardware enable for the second current regulation loop, pulling TG high to disable the PMOS switch without idling the oscillator or affecting PWM timing. In contrast, the SYNC pin on LT3796HFE#PBF synchronizes the internal oscillator to an external clock and requires RT resistor adjustment. TGEN functionality is exclusive to LT3796-1 variants like LT3796HFE-1#PBF and is not present on base LT3796 devices.

Can the LT3796HFE-1#PBF regulate both constant-current and constant-voltage modes simultaneously?

Yes-the LT3796HFE-1#PBF supports concurrent CC/CV operation using FB1 and FB2 pins. FB1 regulates primary output voltage (e.g., battery CV termination) while FB2 manages secondary voltage (e.g., auxiliary rail), or vice versa. When both loops are active, the error amplifier with higher VC output dominates switching control. This dual-FB architecture enables seamless transitions between CC and CV states in battery charging and hybrid LED+sensor power systems.

What is the purpose of the ISMON pin on the LT3796HFE-1#PBF, and how is its output scaled?

The ISMON pin on LT3796HFE-1#PBF provides a voltage output proportional to LED current: V_ISMON = I_LED × R_LED × 4. It enables system-level current telemetry without additional sensing circuitry. When PWM is low, ISMON is actively pulled to GND. For accurate reporting, ISMON should be bypassed with ≥47 nF capacitor to ground. This feature simplifies closed-loop brightness control and real-time health monitoring in commercial LED installations.

Does the LT3796HFE-1#PBF require external components for soft-start, and how is the fault recovery timer implemented?

Yes-the LT3796HFE-1#PBF uses an external capacitor on the SS pin to set soft-start duration. During normal startup, a 28 µA internal current source charges SS; during faults (e.g., overcurrent, thermal shutdown), a 2.8 µA pull-down discharges it. Recovery requires SS to fall below 0.2 V before reinitiating soft-start. This dual-current-source design eliminates need for external timers or microcontroller intervention, ensuring autonomous fault recovery in standalone LED drivers and charging systems.

LT3796HFE-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 ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 28-TSSOP-EP

LT3796HFE-1#PBF FAQ

1.How can I place an order for LT3796HFE-1#PBF through Aetrix?

Please submit a Request for Quotation (RFQ) for LT3796HFE-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 LT3796HFE-1#PBF reliable?

The price and inventory of LT3796HFE-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 LT3796HFE-1#PBF is usually 5 days.

3.What payment methods are accepted for LT3796HFE-1#PBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3796HFE-1#PBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LT3796HFE-1#PBF?

LT3796HFE-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LT3796HFE-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 LT3796HFE-1#PBF?

For technical support, including LT3796HFE-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3796HFE-1#PBF requirements.

6.How does Aetrix verify that LT3796HFE-1#PBF is sourced from the original manufacturer or authorized distributors?

All LT3796HFE-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 LT3796HFE-1#PBF meets industry standards.

7.What is the process for return or replacement of LT3796HFE-1#PBF?

All LT3796HFE-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3796HFE-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 LT3796HFE-1#PBF part is unused and in its original packaging.

Return procedure for LT3796HFE-1#PBF:

1.Submit a request within 90 days.

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

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