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Microchip Technology AT9932TS-G
- Part No.:
- AT9932TS-G
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT9932TS-G.pdf
- Description:
- IC LED DRIVER CTRLR PWM 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,815
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Product details
Overview
AT9932TS-G from Microchip Technology is an AEC-Q100-compliant automotive boost-buck LED lamp driver IC that controls external N-channel MOSFETs in Ćuk topology to deliver constant output current across input voltage transients (5.3–40 V). It features ±3% trimmed 1.25 V reference, 105 kHz typical switching frequency (programmable via RT), and integrated temperature foldback using external NTC for LED thermal derating - deployed in headlamp and DRL modules.
For engineers reviewing the AT9932TS-G datasheet, AT9932TS-G pinout, AT9932TS-G application, or AT9932TS-G equivalent, this page delivers verified functional architecture, validated pin roles, confirmed automotive-grade protection features (UVLO, open/short LED, overtemperature shutdown), and real-world design meaning of feed-forward ramp control, jitter modulation, and gate driver specs - all traceable to DS20005789A.
Technical Context
The AT9932TS-G implements a feed-forward current control scheme with differential output current sensing and soft-start, enabling fast transient response and low susceptibility to SAE J1455/ISO 7637-2 input voltage transients. Its transconductance amplifier (gm = 0.95 mA/V, GBW = 1 MHz) closes the LED current loop via COMP, while internal 40 V regulator powers AVDD/PVDD rails independently.
Switching frequency (100–800 kHz) is set by RT resistor; jitter modulation (50–500 Hz) is configured via JTR capacitor to reduce EMI. Temperature foldback uses NTC, T1, T2, and DRP pins to implement two-point current derating (I₁ at T₁, I₂ at T₂) and overtemperature shutdown triggered when INTC > 3IT₁ + 6IT₂.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Boost-buck (Ćuk) for step-up/down voltage conversion with capacitive isolation between input and LED load |
| Input Voltage Range | 5.3 V to 40 V DC - supports full automotive battery range including cold-crank (6 V) and load-dump (40 V) |
| Reference Voltage | 1.25 V ±3% - used to program LED current via external sense resistor and divider network |
| Switching Frequency | 105 kHz typical (RT = 200 kΩ) - programmable from 100 kHz to 800 kHz for EMI optimization and inductor sizing |
| Gate Driver Output | ±1 A peak, 20–35 ns rise/fall time - drives logic-level N-MOSFETs with 90% max duty cycle and PVDD/PGND separation |
| Protection Features | UVLO (1.25 V threshold), open/short LED (via FLT comparator), overtemperature shutdown (NTC-based), short LED protection |
| Operating Temp | –40°C to +125°C ambient - qualified per AEC-Q100 Grade 1 for under-hood automotive lighting |
Pinout & Package
24-lead TSSOP (TS package), 7.80 × 4.40 mm body, 0.65 mm pitch, RoHS-compliant matte tin finish (G suffix). Thermal resistance θJA = 125°C/W on 25 mm × 25 mm FR-4 board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | High-voltage input | Accepts 5.3–40 V; powers internal 40 V regulator feeding AVDD and PVDD rails |
| GATE | Power MOSFET driver output | ±1 A capable gate drive signal for external N-channel FET; max 90% duty cycle |
| FFN / FFP | Feed-forward ramp generator inputs | Set gate on-time via current mirror; FFN sinks current proportional to coupling capacitor voltage; FFP cancels FFN error |
| T1 / T2 / NTC / DIV | Temperature foldback interface | Program LED current derating curve (T₁, T₂ thresholds) and overtemperature shutdown using external NTC resistor |
| FLT | Fault detection input | Triggers shutdown on open/short LED string; comparator trips at ±20 mV relative to GND |
| PWMD | PWM dimming enable | Logic-high (>2 V) resumes switching; logic-low (<0.8 V) disables gate and holds COMP voltage |
| REF | Precision reference output | 1.25 V ±3% source for LED current programming and internal biasing; requires 0.01–0.1 µF bypass |
| COMP | Error amplifier output | Transconductance amplifier output (0.7–VDD range); connects to compensation network for stable current loop |
Key Features
| Feature | Design Value |
|---|---|
| Feed-forward current control | Enables instantaneous rejection of input voltage transients - critical for passing ISO 7637-2 pulse 5a/b tests in automotive lighting |
| Externally programmable jitter | JTR capacitor sets 50–500 Hz modulation frequency to spread EMI spectrum and reduce peak conducted emissions |
| Dual-point temperature foldback | Configurable I₁/T₁ and I₂/T₂ points via NTC, T1, T2, DRP, and R₄ allow precise matching to LED manufacturer derating curves |
| Capacitive isolation topology | Ćuk converter decouples LED load from input - prevents catastrophic failure of LEDs if power MOSFET shorts |
| Integrated UVLO and fault protection | UVLO (1.25 V threshold with 200 mV hysteresis) and FLT comparator provide autonomous shutdown during brownout or open/short LED events |
Applications
| Automotive Headlamps | Daytime Running Lights (DRL) |
|---|---|
|
Use Scenario: High-brightness LED arrays in adaptive front-lighting systems requiring stable current under engine cranking (6 V) and load dump (40 V). IC Role / Device Role / Timing Role: AT9932TS-G acts as constant-current controller in Ćuk topology, regulating LED current via feedback from RS and FB while rejecting input transients via feed-forward ramp. Use Value: Maintains ±3% current accuracy across –40°C to +125°C and passes SAE J1455 transient immunity without external suppressors. |
Use Scenario: Compact, thermally constrained LED modules mounted near vehicle grille, subject to ambient temperatures up to 105°C. IC Role / Device Role / Timing Role: AT9932TS-G implements two-point temperature foldback (T₁ = 85°C, T₂ = 125°C) using NTC, T1, T2, and DRP to linearly reduce LED current above T₁. Use Value: Prevents LED lumen depreciation and color shift by limiting junction temperature - extends lifetime beyond 5,000 hours at full brightness. |
| Off-Road Vehicle Lighting | Commercial Truck Marker Lamps |
|
Use Scenario: LED lamps exposed to wide input voltage swings (9–32 V) and mechanical vibration in agricultural and construction equipment. IC Role / Device Role / Timing Role: AT9932TS-G provides open/short LED protection via FLT pin and UVLO lockout during battery disconnect/reconnect cycles. Use Value: Eliminates need for external fault monitoring circuitry; automatic restart after POR delay ensures lamp re-illumination without microcontroller intervention. |
Use Scenario: Cost-sensitive, high-volume marker lamps requiring robust operation across commercial fleet duty cycles (–40°C start, +85°C sustained). IC Role / Device Role / Timing Role: AT9932TS-G serves as primary LED driver with integrated 40 V regulator, eliminating need for external pre-regulator in 24 V truck systems. Use Value: Reduces BOM count by 3 components (pre-regulator, UVLO supervisor, thermal monitor) while maintaining AEC-Q100 compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4425HGJ-P | Monolithic 2 A buck LED driver; fixed 2.2 MHz frequency; no boost-buck capability or NTC foldback | Only suitable for step-down-only LED strings; lacks automotive transient immunity architecture | Select when input always exceeds LED forward voltage and thermal management is handled externally |
| LM3409QMYX/NOPB | Current-mode buck controller; supports external N-MOSFET; no integrated reference or feed-forward ramp | Requires external 1.25 V reference and additional compensation; no built-in temperature foldback or jitter | Choose for non-automotive industrial LED drivers where cost sensitivity outweighs transient robustness |
Compared with MPQ4425HGJ-P and LM3409QMYX/NOPB, the AT9932TS-G uniquely combines boost-buck topology, feed-forward transient rejection, and factory-trimmed 1.25 V reference in a single AEC-Q100-qualified IC - making it irreplaceable for automotive headlamp designs requiring fail-safe operation under ISO 7637-2 stress conditions.
Availability
AT9932TS-G is available at Aetrix Electronics and suitable for automotive lighting, battery-powered LED lamps, and low-voltage DC/DC LED drivers requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for AT9932TS-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 is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and timing solutions, with broad automotive qualification expertise and global manufacturing traceability.
The AT9932TS-G belongs to Microchip's automotive LED driver product line, engineered specifically for high-reliability boost-buck lamp control in headlamps, DRLs, and fog lamps - emphasizing transient immunity, thermal safety, and system-level failure containment.
FAQ
What is the maximum input voltage rating for the AT9932TS-G?
The AT9932TS-G has an absolute maximum VIN rating of +45 V, with operational input range specified from 5.3 V to 40 V. This allows direct connection to 24 V commercial vehicle batteries and safe operation during ISO 7637-2 load-dump transients up to 40 V. Exceeding 45 V risks permanent damage per DS20005789A Absolute Maximum Ratings.
How does the AT9932TS-G achieve low susceptibility to input voltage transients?
The AT9932TS-G uses a feed-forward current control architecture where the FFN/FFP pins generate a voltage ramp proportional to the coupling capacitor voltage (VC1). This enables instantaneous gate on-time adjustment in response to input transients - a key reason why the AT9932TS-G passes SAE J1455 and ISO 7637-2 without external TVS diodes in many implementations.
Can the AT9932TS-G drive both boost and buck LED configurations?
Yes - the AT9932TS-G is designed specifically for boost-buck (Ćuk) topology, which inherently supports both step-up and step-down voltage conversion. Unlike conventional buck or boost controllers, the AT9932TS-G maintains constant LED current regardless of whether VIN is below or above the LED string forward voltage, as confirmed in the General Description and Functional Description sections of DS20005789A.
What external components are required to implement temperature foldback with the AT9932TS-G?
To implement temperature foldback, the AT9932TS-G requires an external NTC thermistor connected between NTC and GND, plus three resistors: R₂ (sets T₁ threshold), R₃ (sets T₂ shutdown point), and R₄ (sets I₂ current at T₂). The DRP pin sources current based on NTC voltage, and equations in DS20005789A Section 3.10 define exact values for each resistor based on NTC resistance at target temperatures.
Is the AT9932TS-G pin-compatible with earlier Supertex versions like the AT9932?
Yes - the AT9932TS-G is a drop-in replacement for the legacy Supertex AT9932, retaining identical pinout, electrical specifications, and functional behavior. Microchip's DS20005789A revision history confirms conversion from Supertex Doc# DSFP-AT9932 with no changes to device functionality, package outline, or pin assignment - only updated marking format and reel quantity.
AT9932TS-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:
- 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:
- PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
AT9932TS-G FAQ
1.How can I place an order for AT9932TS-G through Aetrix?
Please submit a Request for Quotation (RFQ) for AT9932TS-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 AT9932TS-G reliable?
The price and inventory of AT9932TS-G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT9932TS-G is usually 5 days.
3.What payment methods are accepted for AT9932TS-G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT9932TS-G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT9932TS-G?
AT9932TS-G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT9932TS-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 AT9932TS-G?
For technical support, including AT9932TS-G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT9932TS-G requirements.
6.How does Aetrix verify that AT9932TS-G is sourced from the original manufacturer or authorized distributors?
All AT9932TS-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 AT9932TS-G meets industry standards.
7.What is the process for return or replacement of AT9932TS-G?
All AT9932TS-G units undergo pre-shipment inspection (PSI). If there is an issue with AT9932TS-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 AT9932TS-G part is unused and in its original packaging.
Return procedure for AT9932TS-G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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