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Analog Devices Inc. LTM8005IY#PBF
- Part No.:
- LTM8005IY#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 80-BGA
- Datasheet:
-
LTM8005IY#PBF.pdf
- Description:
- IC LED DRVR RGLTR PWM 1.6A 80BGA
- Quantity:
- Payment:
- Shipping:
Inventory:4,101
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Product details
Overview
LTM8005IY#PBF from Analog Devices is a 38V input, 38V output boost µModule LED driver IC with integrated 10A/40V power switch, designed for high-current LED string regulation in industrial and automotive lighting. It delivers up to 1.6A LED current across 5V–38V input, supports true-color PWM dimming up to 3000:1, and features spread-spectrum frequency modulation for EMI reduction. Used in high-brightness signage, machine vision illumination, and UV curing systems.
For engineers reviewing the LTM8005IY#PBF datasheet, LTM8005IY#PBF pinout, LTM8005IY#PBF application, or LTM8005IY#PBF equivalent, key selection considerations include its 9mm × 11.25mm BGA package with thermal bottom-side pads, programmable soft-start and fault restart timer, open/short LED protection flags (OPENLED/SHORTLED), and dual analog dimming via CTRL1/CTRL2 pins with 0.16A–1.6A current range.
Technical Context
The LTM8005IY#PBF implements a fixed-frequency current-mode boost controller with internal N-channel MOSFET (RDS(ON) = 19 mΩ) and integrated sense resistor for LED current regulation. Its transconductance error amplifier (VC pin) drives the switching node (SW) through a PWM-controlled gate driver, while FB pin feedback enables constant-voltage operation or LED fault detection at 1.25V nominal reference.
It supports multiple topologies-boost, SEPIC, buck-boost-via configurable SW, DA, and LED pin connections. Spread spectrum modulation (70% frequency deviation) is controlled by RAMP pin capacitance, and input/output current reporting is provided via ISMON (1.6× scaling) and IVINCOMP (20× scaling) pins with dedicated sense amplifiers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5V to 38V - supports wide-range industrial DC supplies and automotive battery variations including cold-crank transients. |
| Max Output Current | 1.6A - regulated LED current with ±5% accuracy over temperature; adjustable down to 0.16A via CTRL pins. |
| Internal Switch Rating | 40V/10A - enables 38V LED strings in boost mode; SW pin voltage stress limited to 40V absolute max. |
| Switching Frequency | 85kHz to 1200kHz - set by RT resistor; includes spread-spectrum modulation reducing peak EMI by >10dBµV/m. |
| Operating Temperature | –40°C to +125°C - I-grade junction rating ensures reliability in under-hood or enclosed industrial enclosures. |
| Package Dimensions | 9mm × 11.25mm × 2.22mm BGA - low-profile thermally enhanced package with θJBOTTOM = 3.0°C/W for PCB heat sinking. |
| PWM Dimming Ratio | 3000:1 - true-color dimming without color shift; compatible with external microcontroller PWM signals ≥100Hz. |
Pinout & Package
Package: 80-pad thermally enhanced Ball Grid Array (BGA), 11.25mm × 9mm × 2.22mm, RoHS-compliant SAC305 finish, MSL Level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Banks 1,2,5) | Power and signal ground reference | Primary thermal path; must connect to large local copper pour for θJBOTTOM = 3.0°C/W performance. |
| SW | Switch node | Drain of internal 10A N-MOSFET; connects to inductor in boost/SEPIC; voltage stress ≤ VIN + VOUT in buck-boost. |
| DA | Diode anode connection | Connects to external Schottky diode anode in boost; or coupling capacitor in SEPIC; defines power path polarity. |
| VOUT | Output power rail | High-current output pins for LED string cathode return; bypass with ≥2×4.7µF/50V ceramic capacitors. |
| LED | LED string anode drive | High-side current source output; connects directly to LED string anode; supports open/short detection via FB. |
| FB | Voltage loop feedback | Regulates to 1.25V; enables CV mode or triggers OPENLED/SHORTLED faults at 1.20V/0.30V thresholds. |
| CTRL1 / CTRL2 | Analog dimming threshold inputs | Set LED current from 0.16A to 1.6A linearly; lower voltage dominates; tie to VREF if unused. |
| PWM | Digital dimming control | Active-high enable; internal 500kΩ pull-down; disconnects LED load and disables switching when low. |
| SS | Soft-start and fault timer | 28µA pull-up to 2.5V; discharges via 2.8µA pull-down on fault; sets start-up ramp time and hiccup restart interval. |
| ISMON | LED current monitor output | Voltage = ILED/1.6; used for closed-loop current feedback or system-level monitoring; 47nF bypass recommended. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 10A/40V power switch | Eliminates external MOSFET and gate driver; reduces BOM count and layout area in space-constrained LED drivers. |
| True-color 3000:1 PWM dimming | Preserves LED chromaticity across full brightness range; avoids flicker and color shift in machine vision and medical lighting. |
| Open/short LED fault detection | Independent OPENLED (FB > 1.20V + ILED < 0.16A) and SHORTLED (FB < 0.30V or ILED > 2.4A) flags with latchable open-drain outputs. |
| Programmable spread-spectrum modulation | Reduces conducted/radiated EMI peaks by spreading switching energy across 70% bandwidth; meets CISPR 22 Class B without added filters. |
| Input current limiting with IVINP/IVINN | Enables precise input power capping using external sense resistor; protects upstream converters during inrush or overload. |
| Thermally optimized BGA package | Bottom-side thermal pads conduct heat directly to PCB; achieves θJCBOTTOM = 3.0°C/W with 4-layer board and 2oz copper. |
Applications
| Industrial High-Brightness Lighting | Automotive Exterior Lighting |
|---|---|
|
Use Scenario: Driving 12–24V LED arrays in factory floor task lighting, warehouse high-bay fixtures, and UV-curing lamps requiring stable current under variable line conditions. IC Role / Device Role / Timing Role: Constant-current boost regulator with programmable soft-start and thermal foldback; regulates LED current independent of forward voltage drift. Use Value: Delivers 1.6A at 35V output from 12V input with <±2% current accuracy over –40°C to +125°C, enabling long-life luminaires without active cooling. |
Use Scenario: Headlamp adaptive driving beam (ADB) modules and DRL systems where EMI compliance and rapid PWM response are critical. IC Role / Device Role / Timing Role: High-efficiency LED current source with 3000:1 PWM dimming and <100ns fault response; integrates OPENLED/SHORTLED status for ASIL-B diagnostics. Use Value: Meets CISPR 25 Class 5 radiated emissions with spread spectrum enabled, eliminating need for ferrite beads or shielding cans in headlamp PCBs. |
| Machine Vision Illumination | Medical Endoscopic Lighting |
|
Use Scenario: Stroboscopic LED flash units for high-speed inspection cameras requiring precise pulse timing and consistent spectral output. IC Role / Device Role / Timing Role: Fast-response current source synchronized to camera trigger; CTRL1/CTRL2 enable analog gain control matching sensor exposure profiles. Use Value: Achieves <1µs current rise/fall time with PWM input; maintains color point stability across 0.1–100% intensity via true-color dimming architecture. |
Use Scenario: Sterilizable endoscope light engines where compact size, thermal resilience, and fault-safe operation are mandatory. IC Role / Device Role / Timing Role: Isolated LED driver front-end with open-circuit detection and thermal shutdown; operates from 24V medical-grade SMPS. Use Value: 9mm × 11.25mm footprint fits within 15mm-diameter endoscope barrels; withstands 150°C autoclave pre-bake cycles per IEC 60601-1. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTM8042IY#PBF | Higher 60V input rating, dual-output capability, but no integrated LED sense resistor; requires external current sensing. | Better suited for multi-string RGBW LED systems with independent channel control; lacks built-in OPENLED/SHORTLED flags. | Select when driving >1 LED string or needing >40V input; accept added BOM complexity for flexibility. |
| LT3762EFE#TRPBF | External MOSFET controller (no integrated switch); wider 6V–100V input; supports synchronous rectification. | Preferred for >100W designs requiring >3A output or custom thermal management; lacks µModule integration and BGA package. | Choose for higher-power or cost-sensitive designs where board space is less constrained than thermal budget. |
Compared with LTM8005IY#PBF, LTM8042IY#PBF offers greater input voltage headroom and multi-channel support but sacrifices single-chip simplicity and fault flag integration; LT3762EFE#TRPBF provides higher power scalability and efficiency at the expense of component count and layout effort.
Availability
LTM8005IY#PBF is available at Aetrix Electronics and suitable for industrial lighting, automotive exterior lamps, and machine vision systems requiring stable component supply, extended temperature operation, and EMI-compliant LED drive solutions.
Supply support for LTM8005IY#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 is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The LTM8005IY#PBF belongs to Analog Devices' µModule regulator family-compact, fully integrated power solutions designed for space-constrained, thermally demanding LED and industrial applications where reliability and EMC performance are critical.
FAQ
What is the maximum LED string voltage supported by the LTM8005IY#PBF?
The LTM8005IY#PBF supports up to 38V output voltage in boost configuration, enabling direct drive of high-VF LED strings such as 10–12 white LEDs in series or UV LED arrays. The internal 40V-rated switch and 38V absolute maximum VOUT rating ensure safe operation with margin for transient overshoot. For SEPIC or buck-boost topologies, SW pin voltage stress reaches VIN + VOUT, so total must remain ≤40V.
How does the LTM8005IY#PBF implement open-LED and short-LED protection?
The LTM8005IY#PBF uses the FB pin voltage and measured LED current to detect faults: OPENLED asserts when FB exceeds 1.20V and LED current falls below 0.16A, indicating an open circuit; SHORTLED asserts when FB drops below 0.30V or LED current exceeds 2.4A, signaling overcurrent or shorted string. Both flags are open-drain outputs requiring external pull-ups and update only during PWM high states.
Can the LTM8005IY#PBF operate in constant-voltage mode?
Yes, the LTM8005IY#PBF can regulate output voltage by connecting a resistor divider from VOUT to GND with the midpoint fed to the FB pin. The internal transconductance amplifier holds FB at 1.25V, resulting in VOUT = 1.25 × (Rtop/Rbottom + 1). This mode also defines OPENLED/SHORTLED thresholds, making it suitable for accurate current-limited voltage regulators beyond LED drive.
What thermal design guidance applies to the LTM8005IY#PBF's BGA package?
The LTM8005IY#PBF's 80-pad BGA relies on bottom-side thermal pads for heat dissipation. To achieve θJCBOTTOM = 3.0°C/W, use ≥2oz copper on inner layers, connect all GND balls to a solid thermal plane, and implement ≥6 thermal vias (0.3mm diameter, 0.6mm pitch) under the package. Avoid solder mask over thermal pads and verify reflow profile per JEDEC J-STD-020.
Is spread-spectrum modulation mandatory for EMI compliance with the LTM8005IY#PBF?
No-spread-spectrum modulation is optional and enabled by applying a capacitor (e.g., 22nF) between RAMP and GND. When disabled (RAMP tied to GND), the LTM8005IY#PBF still meets basic conducted EMI requirements in many layouts, but spread spectrum reduces peak radiated emissions by up to 10dBµV/m, easing CISPR 22/25 Class B certification without additional filtering components.
LTM8005IY#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 80-BGA
- Packaging:
- Tray
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost), SEPIC
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 5V
- Voltage - Supply (Max):
- 38V
- Voltage - Output:
- 38V
- Current - Output / Channel:
- 1.6A
- Frequency:
- 85kHz ~ 1.2MHz
- Dimming:
- Analog, PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 80-BGA (11.25x9)
LTM8005IY#PBF FAQ
1.How can I place an order for LTM8005IY#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTM8005IY#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 LTM8005IY#PBF reliable?
The price and inventory of LTM8005IY#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTM8005IY#PBF is usually 5 days.
3.What payment methods are accepted for LTM8005IY#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTM8005IY#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTM8005IY#PBF?
LTM8005IY#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTM8005IY#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 LTM8005IY#PBF?
For technical support, including LTM8005IY#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTM8005IY#PBF requirements.
6.How does Aetrix verify that LTM8005IY#PBF is sourced from the original manufacturer or authorized distributors?
All LTM8005IY#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 LTM8005IY#PBF meets industry standards.
7.What is the process for return or replacement of LTM8005IY#PBF?
All LTM8005IY#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTM8005IY#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 LTM8005IY#PBF part is unused and in its original packaging.
Return procedure for LTM8005IY#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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