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Microchip Technology AT9917TS-G
- Part No.:
- AT9917TS-G
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT9917TS-G.pdf
- Description:
- IC LED DRIVER CTRLR PWM 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,588
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Product details
Overview
AT9917TS-G from Microchip Technology is a fixed-frequency peak current-mode PWM controller IC for automotive LED drivers, supporting boost, SEPIC, and buck topologies in constant-current mode. It integrates a ±1A gate driver, internal 40V linear regulator, 1.25V reference (±3%), programmable slope compensation, and AEC-Q100 qualification. Designed for high-power LED lamp drivers achieving >90% efficiency in buck/boost configurations.
For engineers reviewing the AT9917TS-G datasheet, AT9917TS-G pinout, AT9917TS-G application, or AT9917TS-G equivalent, key selection considerations include its closed-loop output current accuracy, TTL-compatible PWM dimming input (0–100% duty, kHz range), temperature foldback via external NTC, hiccup-mode fault recovery, and integrated OVP/short-circuit protection with FLT output for external disconnect FET control.
Technical Context
The AT9917TS-G implements peak current-mode control with programmable slope compensation to ensure stability at duty cycles >0.5. Its transconductance error amplifier (950 µA/V, 1 MHz GBW) closes the current loop using feedback from the FDBK pin and sets ILED via the IREF pin voltage.
Internal circuitry includes dual threshold comparators for overvoltage (1.15–1.35 V trip, 125 mV hysteresis) and short-circuit detection, synchronized to a jittered oscillator (100–800 kHz, set by RT resistor). Fault handling uses a capacitor-programmed hiccup timer (via JTR pin) and active FLT output that pulls low during OVP or short-circuit events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 100–800 kHz; set by RT resistor (e.g., 200 kΩ → 505 kHz typ); enables topology-optimized switching speed and EMI control. |
| Reference Voltage | 1.25 V ±3%; used to program precise LED current via IREF pin; stable across –40°C to +125°C ambient. |
| GATE Drive Strength | ±1 A; drives logic-level N-channel MOSFETs directly; supports high-power LED strings without external buffer stages. |
| Current Sense Blanking | 100–250 ns; suppresses false turn-off from FET turn-on spikes at CS pin; critical for reliable peak current sensing. |
| OVP Trip Threshold | 1.25 V (rising), 1.125 V (falling); protects LEDs from overvoltage in boost/SEPIC configurations via OVP pin comparator. |
| Short-Circuit Response | <250 ns propagation; FLT asserts low within nanoseconds of fault detection; enables fast load disconnection in automotive systems. |
| Thermal Foldback | Programmable via NTC, T1, T2, DIV pins; allows graded current derating before thermal shutdown; prevents LED thermal runaway. |
| AEC-Q100 Grade | Qualified to Grade 1 (–40°C to +125°C); validated for under-hood automotive LED lighting applications. |
Pinout & Package
AT9917TS-G is housed in a 24-lead TSSOP package (0.65 mm pitch, 7.8 mm × 4.4 mm body), optimized for thermal dissipation in automotive PCB layouts with exposed pad grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | High-voltage input | Accepts 5.3–40 V DC; powers internal 40 V linear regulator; eliminates need for external bias supply. |
| AVDD / PVDD | Analog & gate driver supplies | AVDD = regulated 5 V (±350 mV); powers analog core; PVDD = same rail, bypassed separately for low-noise gate drive. |
| GATE / PGND | Power switch interface | ±1 A push-pull output; PGND is dedicated return for gate drive current to minimize noise coupling into analog ground. |
| CS | Current sense input | Monitors FET source current; includes 100 ns blanking and slope compensation interface (RSC/CSC) for CCM stability. |
| FDBK / IREF | Current feedback & reference | FDBK senses LED current via external resistor; IREF voltage (derived from REF) sets target current with closed-loop accuracy. |
| FLT / PWMD | Fault signaling & dimming control | FLT is open-drain fault flag (OVP/short-circuit); PWMD is TTL-compatible dimming enable (0–100% duty, kHz range). |
| NTC / T1 / T2 / DIV | Thermal management inputs | Interface to external NTC thermistor; T1/T2 set foldback thresholds; DIV scales NTC voltage for accurate temperature mapping. |
| RT / JTR / SS / COMP | Timing, protection & compensation | RT sets oscillator frequency; JTR programs jitter + hiccup timer; SS controls soft-start ramp; COMP hosts type-II/III compensation network. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated ±1A gate driver | Drives high-gate-charge MOSFETs directly-eliminates external driver stage and reduces BOM count in 50–150 W LED systems. |
| Programmable slope compensation | Stabilizes peak current-mode control in continuous conduction mode (CCM) boost/SEPIC; prevents subharmonic oscillation above 50% duty cycle. |
| TTL-compatible PWM dimming | Supports up to several kHz dimming frequency with no external level-shifting; enables >1000:1 dimming ratio in boost configurations with FLT-controlled load disconnect. |
| Output short-circuit & OVP protection | Dual independent fault detection paths trigger immediate GATE/FLT disable and enter hiccup recovery-prevents thermal damage during load faults. |
| Temperature foldback with NTC interface | Allows precise, user-defined current derating curve (via T1/T2 thresholds) to extend LED lifetime and maintain color consistency under thermal stress. |
| AEC-Q100 Grade 1 compliance | Validated for automotive under-hood environments; ensures reliability across –40°C to +125°C junction temperature range. |
Applications
| Automotive Headlamp Driver | Automotive Tail Lamp Module |
|---|---|
Use Scenario: High-brightness LED headlamps requiring adaptive beam shaping and dynamic current control in 12 V/24 V vehicle electrical systems. IC Role / Device Role / Timing Role: Constant-current PWM controller managing buck-boost LED string with real-time thermal foldback and load-dump tolerant fault response. Use Value: Enables >90% efficiency at full brightness while maintaining ±3% current accuracy across temperature and input voltage variation. | Use Scenario: Red LED stop/tail lamp assembly with integrated diagnostics, PWM dimming for brake vs. tail intensity, and short-circuit resilience. IC Role / Device Role / Timing Role: Primary LED current controller with built-in OVP and short-circuit detection; FLT output drives external MOSFET to isolate faulty strings. Use Value: Eliminates need for discrete protection ICs; supports fail-safe operation during rear-end collisions where wiring shorts occur. |
| Commercial Vehicle Lighting | Off-Road Equipment Beacon |
Use Scenario: Heavy-duty truck marker lamps exposed to wide input transients (load dump up to 60 V) and extreme ambient temperatures. IC Role / Device Role / Timing Role: Robust LED driver IC with 40 V VIN tolerance, AEC-Q100 qualification, and hiccup-mode recovery for intermittent faults. Use Value: Sustains operation through ISO 7637-2 pulse 5a/b transients without latch-up or parameter shift; reduces field failure rates. | Use Scenario: High-visibility amber beacon on construction equipment requiring high-current pulsed operation and thermal margin in dusty, high-ambient environments. IC Role / Device Role / Timing Role: Peak-current-mode controller with programmable jitter (via JTR) to reduce EMI in electrically noisy machinery cabins. Use Value: Meets CISPR 25 Class 5 radiated emissions limits without added shielding or ferrites-lowers system cost and weight. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3410XMY/NOPB | Single-ended boost controller only; no SEPIC/buck support; 1.25 V ref ±2%; no integrated NTC interface or hiccup timer. | Limited to low-to-mid power boost LED drivers; lacks automotive thermal management features and fault robustness. | Choose for cost-sensitive non-automotive boost-only designs where thermal foldback and AEC-Q100 are not required. |
| MAX16832AATA+T | Fixed 500 kHz frequency; no programmable jitter; no internal linear regulator (requires AVDD supply); no T1/T2 NTC programming. | Suitable for industrial LED drivers with stable 5 V bias; less flexible for wide-input automotive systems needing VIN-powered operation. | Prefer when board space is constrained and external 5 V rail is available; avoid if direct 12 V/24 V input powering or advanced thermal control is needed. |
Compared with LM3410XMY/NOPB and MAX16832AATA+T, the AT9917TS-G uniquely combines multi-topology support (buck/boost/SEPIC), integrated 40 V regulator, AEC-Q100 qualification, and full NTC-based thermal foldback-making it the only option qualified for demanding automotive front-lighting applications requiring both performance and functional safety readiness.
Availability
AT9917TS-G is available at Aetrix Electronics and suitable for automotive LED headlamps, commercial vehicle lighting systems, and off-road equipment beacons requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.
Supply support for AT9917TS-G 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
Microchip Technology Inc. is a U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and power management ICs for automotive, industrial, and consumer markets.
The AT9917TS-G belongs to Microchip's automotive-grade LED driver controller product line, designed specifically for high-reliability, constant-current LED lighting in vehicles-emphasizing thermal resilience, fault tolerance, and EMI reduction in harsh electrical environments.
FAQ
What is the maximum input voltage supported by the AT9917TS-G?
The AT9917TS-G supports an absolute maximum input voltage of +45 V on the VIN pin, with a recommended operating range of 5.3 V to 40 V DC. This wide input range accommodates 12 V and 24 V automotive systems-including transient conditions like load dump-while the internal 40 V linear regulator powers all internal circuitry without external bias rails.
How does the AT9917TS-G implement thermal protection for LED strings?
The AT9917TS-G implements thermal protection via an external NTC thermistor connected to the NTC pin, with thresholds programmed using T1 and T2 pins. The internal circuitry derives a temperature-dependent current (INTC) and applies programmable gain (NNTC, NT1, NT2) to generate a foldback signal that reduces LED current before reaching critical junction temperatures-preventing thermal runaway while maintaining light output stability.
Can the AT9917TS-G be used in buck, boost, and SEPIC topologies without hardware changes?
Yes-the AT9917TS-G is architecturally designed for all three topologies. Its peak current-mode control, programmable slope compensation, and flexible feedback architecture (via FDBK/IREF) allow seamless reconfiguration between buck, boost, and SEPIC by adjusting external passive components (inductor, capacitor, sense resistor) and compensation network-no IC-level changes or firmware updates are required.
What is the role of the FLT pin in AT9917TS-G-based LED drivers?
The FLT pin on the AT9917TS-G is an open-drain fault indicator that pulls low during overvoltage or output short-circuit events. In boost/SEPIC configurations, it drives an external disconnect FET to isolate the LED load-enabling safe fault recovery and high-ratio PWM dimming without discharging output capacitors. Its <250 ns response ensures rapid system-level protection.
Does the AT9917TS-G require an external clock or can it operate autonomously?
The AT9917TS-G operates autonomously using its internal oscillator, which is programmed via the RT pin resistor (100–800 kHz range). No external clock source is required. The JTR pin further enhances EMI performance by introducing programmable frequency jitter-reducing spectral peaks without compromising regulation accuracy or loop stability.
AT9917TS-G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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):
- 5.3V
- Voltage - Supply (Max):
- 40V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- 100kHz ~ 800kHz
- Dimming:
- Analog, PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
AT9917TS-G FAQ
1.How can I place an order for AT9917TS-G through Aetrix?
Please submit a Request for Quotation (RFQ) for AT9917TS-G 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 AT9917TS-G reliable?
The price and inventory of AT9917TS-G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT9917TS-G is usually 5 days.
3.What payment methods are accepted for AT9917TS-G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT9917TS-G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT9917TS-G?
AT9917TS-G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT9917TS-G 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 AT9917TS-G?
For technical support, including AT9917TS-G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT9917TS-G requirements.
6.How does Aetrix verify that AT9917TS-G is sourced from the original manufacturer or authorized distributors?
All AT9917TS-G 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 AT9917TS-G meets industry standards.
7.What is the process for return or replacement of AT9917TS-G?
All AT9917TS-G units undergo pre-shipment inspection (PSI). If there is an issue with AT9917TS-G, 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 AT9917TS-G part is unused and in its original packaging.
Return procedure for AT9917TS-G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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