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Diodes Incorporated AZ494CM-G1
- Part No.:
- AZ494CM-G1
- Manufacturer:
- Diodes Incorporated
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AZ494CM-G1.pdf
- Description:
- IC REG BUCK ADJ 200MA DL 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,229
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Product details
Overview
AZ494CM-G1 from Diodes Incorporated is a voltage-mode dual-output PWM controller IC designed for switching power supply control, featuring a trimmed 5.0V reference (±1%), dual error amplifiers, on-chip oscillator with master/slave capability, dead-time control comparator, and push-pull or single-ended output selection via OUTPUT CTRL pin. It operates over 7–36V supply range and supports SMPS, backlight inverters, and battery chargers.
For engineers reviewing the AZ494CM-G1 datasheet, AZ494CM-G1 pinout, AZ494CM-G1 application, or AZ494CM-G1 equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated SO-16 pin functions, confirmed alternative parts with functional distinctions, and supply support for industrial power design programs.
Technical Context
The AZ494CM-G1 implements voltage-mode PWM control using two independent error amplifiers (pins 1/2 and 15/16) to regulate separate feedback loops, with outputs steered by a pulse-steering flip-flop and gated by a dead-time control comparator (pin 4). Its oscillator (pins 5/6) sets frequency via external RT/CT components, supporting 1–200 kHz operation with ±1% reference accuracy enabling tight output voltage regulation.
Output configuration is determined by the OUTPUT CTRL pin (pin 13): grounding selects single-ended or parallel mode; tying to VREF enables normal push-pull operation. Internal logic prevents double-pulsing at either output, and uncommitted TR output (pin 12) provides 200 mA sink/source capability for auxiliary timing or gate drive functions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 5.0 V ±1% (AZ494C variant); enables precise output voltage setpoint with <15 mV load regulation error |
| fOSC Range | 1–200 kHz; set by external RT (1.8–500 kΩ) and CT (0.47 nF–10 μF); supports wide input/output ratio designs |
| Duty Cycle Max | 45% (at DTC pin = 0 V); limits minimum off-time to prevent transformer saturation in forward converters |
| Output Drive | 200 mA sink/source on TR pin; sufficient to directly drive MOSFET gates or optocoupler LEDs without buffer |
| VCC Range | 7–36 V; accommodates 12 V and 24 V industrial bus rails with built-in undervoltage lockout margin |
| TA Operating Range | −40 to +85 °C; qualified for industrial ambient conditions without derating |
| ICC Supply Current | 6–10 mA typical; low quiescent draw supports high-efficiency standby modes |
Pinout & Package
AZ494CM-G1 is housed in a RoHS-compliant, halogen-free SO-16 surface-mount package (JEDEC MS-012AC, 10.2 × 6.24 mm), rated for 67 °C/W thermal impedance and compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 (1IN+, 1IN−) | Error Amp 1 Input | Differential input for first regulated output; common-mode range extends to VCC − 2 V |
| 3 (FEEDBACK) | Error Amp 1 Inverting Input | Accepts resistor-divider feedback signal; sinks up to 0.7 mA for direct connection to optocoupler |
| 4 (DTC) | Dead-Time Control Input | Sets maximum duty cycle limit; 3.3 V threshold ensures safe overlap prevention in push-pull topologies |
| 5 (CT), 6 (RT) | Oscillator Timing | RC network pins defining fOSC; CT accepts 0.47 nF–10 μF; RT accepts 1.8–500 kΩ |
| 7 (GND) | Power Ground | Analog/digital ground reference; requires low-impedance PCB plane tie to minimize noise coupling |
| 8 (C1) | Output 1 Collector | Open-collector NPN output; drives external PNP/N-channel switch with 200 mA sink capability |
| 9 (VCC) | Supply Input | 7–36 V bias rail; internal UVLO activates below ~6.5 V to prevent erratic startup |
| 10 (C2) | Output 2 Collector | Second open-collector NPN output; independently controllable and synchronized with C1 |
| 11 (E2) | Output 2 Emitter | Emitter-follower output option; provides low-impedance source drive for gate drivers |
| 12 (TR) | Uncommitted Transistor | NPN transistor with 200 mA sink/source; usable for soft-start timing, fault latching, or auxiliary PWM |
| 13 (OUTPUT CTRL) | Output Mode Select | GND = single-ended/parallel; VREF = push-pull; enables topology flexibility without external logic |
| 14 (REF) | 5.0 V Reference Output | 10 mA capable; powers feedback dividers or external circuitry with ±1% stability over temperature |
| 15, 16 (2IN+, 2IN−) | Error Amp 2 Input | Second independent regulation path; supports dual-output or redundant feedback architectures |
Key Features
| Feature | Design Value |
|---|---|
| Trimmed 5.0 V reference | ±1% accuracy over −40 to +85 °C enables ±1.5% total output regulation without trimming |
| Single-ended/push-pull select | Hardware-configured via OUTPUT CTRL pin-no firmware or external logic required for topology change |
| Double-pulse suppression | Internal flip-flop gating eliminates shoot-through risk in half-bridge or push-pull drivers |
| On-chip oscillator | Supports master/slave synchronization; eliminates need for external clock generator in multi-rail systems |
| 200 mA TR output | Directly drives gate resistors ≤10 Ω or optocoupler LEDs without external transistors |
Applications
| Industrial AC/DC Adapter | LCD Backlight Inverter |
|---|---|
|
Use Scenario: 24 V input, 12 V/3 A regulated output for PLC I/O modules with transient immunity. IC Role / Device Role / Timing Role: Primary PWM controller managing synchronous rectification and current limiting via dual error amps. Use Value: 45% max duty cycle prevents core saturation during line dips; 5.0 V reference ensures ±12 mV output tolerance across temperature. |
Use Scenario: 12 V input driving CCFL lamps requiring 600–1000 V AC at 60 kHz with soft-start ramp. IC Role / Device Role / Timing Role: Dual-output controller generating complementary gate drives with programmable dead time. Use Value: DTC pin sets 200 ns minimum off-time; TR output sources 200 mA for lamp ignition pre-charge circuit. |
| USB-C PD Charger | Medical Equipment Power Supply |
|
Use Scenario: 9–20 V input, dual 5 V/3 A and 12 V/1.5 A outputs with dynamic load sharing. IC Role / Device Role / Timing Role: Independent regulation of both outputs using separate error amplifiers and shared oscillator. Use Value: REF pin supplies precision bias to secondary-side optocouplers; CT/RT tuning achieves 150 kHz for compact magnetics. |
Use Scenario: 24 V DC input powering isolated 3.3 V logic and 5 V analog rails in patient-monitoring devices. IC Role / Device Role / Timing Role: Dual-output controller implementing redundancy with cross-monitoring via FEEDBACK and 2IN− inputs. Use Value: −40 to +85 °C rating meets IEC 60601-1 ambient requirements; halogen-free/Green compliance satisfies medical material restrictions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-mode dual-output PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UC3846N | Current-mode control; 500 kHz max fOSC; no integrated 5 V reference; requires external VREF | Better suited for high-frequency flyback with peak-current sensing; lacks dual-error-amp flexibility | Select when precise current limiting is mandatory and board space allows external reference and slope compensation |
| TL494CN | Fixed 5.0 V reference (±2%); no DTC pin; max duty cycle 48%; SO-16 but not Green/RoHS-6 compliant | Legacy-compatible replacement; lower reference accuracy increases output drift; no halogen-free certification | Choose only for cost-sensitive, non-certified industrial repairs where RoHS/Green compliance is waived |
Compared with UC3846N and TL494CN, AZ494CM-G1 offers tighter reference accuracy (±1% vs ±2% or external), integrated dead-time control for safer push-pull operation, and full RoHS-6/halogen-free compliance-making it optimal for new industrial and medical designs requiring long-term component availability and regulatory alignment.
Availability
AZ494CM-G1 is available at Aetrix Electronics and suitable for industrial AC/DC adapters, LCD backlight inverters, and USB-C PD chargers requiring stable component supply, long-lifecycle support, and RoHS-6/Green compliance.
Supply support for AZ494CM-G1 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Malaysia, and Taiwan.
AZ494 belongs to Diodes' legacy power management controller product line, engineered specifically for cost-effective, robust voltage-mode SMPS designs in industrial, computing, and consumer power applications.
FAQ
What is the function of the OUTPUT CTRL pin (Pin 13) on AZ494CM-G1?
Pin 13 configures output topology: grounding enables single-ended or parallel operation, while connecting to VREF (Pin 14) selects normal push-pull mode. This hardware-selectable feature eliminates external logic and ensures deterministic timing alignment between C1 and C2 outputs without software intervention.
Can AZ494CM-G1 operate with a 5 V supply voltage?
No-AZ494CM-G1 requires a minimum VCC of 7 V per its Recommended Operating Conditions. At 5 V, internal biasing fails, reference regulation collapses, and oscillator stall occurs. For 5 V input systems, a charge-pump or LDO pre-regulator must supply ≥7 V to Pin 9.
How does the DTC (Pin 4) pin affect maximum duty cycle?
DTC sets the upper limit of PWM on-time: at 0 V input, max duty cycle is 45%; increasing DTC voltage linearly reduces it down to 0%. This prevents transformer saturation in forward converters and ensures safe dead-time margins in bridge configurations without external comparators.
Is AZ494CM-G1 pin-compatible with AZ494AP-G1?
Yes-both share identical SO-16 and PDIP-16 pinouts and electrical specifications, differing only in reference voltage (5.0 V vs 4.95 V) and package type. AZ494CM-G1 uses SO-16; AZ494AP-G1 uses PDIP-16. No PCB redesign is needed when migrating between them if layout accommodates SO-16 footprint.
AZ494CM-G1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 7V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- 36V
- Current - Output:
- 200mA
- Frequency - Switching:
- 40kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
AZ494CM-G1 FAQ
1.How can I place an order for AZ494CM-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ494CM-G1 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 AZ494CM-G1 reliable?
The price and inventory of AZ494CM-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ494CM-G1 is usually 5 days.
3.What payment methods are accepted for AZ494CM-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ494CM-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ494CM-G1?
AZ494CM-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ494CM-G1 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 AZ494CM-G1?
For technical support, including AZ494CM-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ494CM-G1 requirements.
6.How does Aetrix verify that AZ494CM-G1 is sourced from the original manufacturer or authorized distributors?
All AZ494CM-G1 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 AZ494CM-G1 meets industry standards.
7.What is the process for return or replacement of AZ494CM-G1?
All AZ494CM-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ494CM-G1, 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 AZ494CM-G1 part is unused and in its original packaging.
Return procedure for AZ494CM-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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