Overview
The CM3202-02DE is a dual-output low noise linear regulator designed by onsemi to meet the specifications for DDR-SDRAM VDDQ supply and termination voltage VTT supply, particularly adhering to SSTL-2 and SSTL-3 standards. This regulator features integrated power MOSFETs, enabling it to source up to 2 A of continuous VDDQ current and source or sink up to 2 A of continuous VTT current. It is notable for its excellent full load regulation, fast response to transient load changes, and built-in over-current limits and thermal shutdown at 170°C. The CM3202-02DE supports Suspend-To-RAM (STR) and ACPI compliance with a Shutdown Mode that minimizes quiescent system current.
Key Specifications
| Parameter | Rating | Units |
|---|---|---|
| VIN to GND | [GND − 0.3] to +6.0 | V |
| VDDQ, VTT to GND | [GND − 0.3] to +6.0 | V |
| ADJSD to GND | [GND − 0.3] to +6.0 | V |
| Output Current (VDDQ / VTT, continuous) | 2.0 / ±2.0 | A |
| Output Current (VDDQ / VTT, peak) | 2.8 / ±2.8 | A |
| Operating Ambient Temperature | –40 to +85 | °C |
| Operating Junction Temperature | –40 to +170 | °C |
| Thermal Resistance, RJA | 55 | °C / W |
| Continuous Power Dissipation (WDFN8, TA = 25°C / 85°C) | 2.6 / 1.5 | W |
| Supply Voltage Range (VIN) | 3.0 to 3.6 | V |
| Quiescent Current (IQ) | 7 to 15 | mA |
| ADJSD Voltage (VADJSD) | 1.225 to 1.275 | V |
| Shutdown Current (ISHDN) | 0.2 to 0.5 | mA |
| ADJSD Logic High (SHDN_H) | 2.7 | V |
| ADJSD Logic Low (SHDN_L) | 1.5 | V |
| Under-Voltage Lockout (UVLO) | 2.40 to 2.90 | V |
| Thermal Shutdown Threshold (TOVER) | 150 to 170 | °C |
Key Features
- Two Linear Regulators
- Maximum 2 A Current from VDDQ
- Source and Sink Up to 2 A VTT Current
- 1.7 V to 2.8 V Adjustable VDDQ Output Voltage
- 0.85 V to 1.4 V VTT Output Voltage (Tracking at 50% of VDDQ)
- 500 mV Typical VDDQ Dropout Voltage at 2 A
- Excellent Load and Line Regulation, Low Noise
- Meets JEDEC DDR-I and DDR-II Memory Power Spec
- Linear Regulator Design Requires no Inductors and Has Low External Component Count
- Integrated Power MOSFETs
- Dual Purpose ADJ/Shutdown Pin
- Built-In Over-Current Limit and Thermal Shutdown for VDDQ and VTT
- Fast Transient Response
- Low Quiescent Current
- Pb-Free and RoHS Compliant
Applications
- DDR Memory and Active Termination Buses
- Desktop Computers, Servers
- Residential and Enterprise Gateways
- DSL Modems
- Routers and Switches
- DVD Recorders
- 3D AGP Cards
- LCD TV and STB
Q & A
- What is the CM3202-02DE used for?
The CM3202-02DE is a dual-output linear regulator designed for DDR-SDRAM VDDQ supply and termination voltage VTT supply, adhering to SSTL-2 and SSTL-3 specifications.
- What are the output current capabilities of the CM3202-02DE?
The CM3202-02DE can source up to 2 A of continuous VDDQ current and source or sink up to 2 A of continuous VTT current.
- What is the typical dropout voltage for VDDQ at 2 A load current?
The typical dropout voltage for VDDQ is 500 mV at 2 A load current.
- What are the operating temperature ranges for the CM3202-02DE?
The CM3202-02DE operates over an ambient temperature range of –40°C to 85°C and a junction temperature range of –40°C to 170°C.
- Does the CM3202-02DE have built-in protection features?
Yes, it has built-in over-current limits and thermal shutdown at 170°C.
- How does the ADJSD pin function?
The ADJSD pin is used for VDDQ output voltage adjustment and also functions as a shutdown pin.
- What is the package type of the CM3202-02DE?
The CM3202-02DE is available in an 8-lead WDFN surface mount package.
- Is the CM3202-02DE compliant with environmental standards?
Yes, the CM3202-02DE is Pb-Free and RoHS Compliant.
- What are some typical applications of the CM3202-02DE?
Typical applications include DDR memory and active termination buses, desktop computers, servers, residential and enterprise gateways, DSL modems, routers, switches, DVD recorders, 3D AGP cards, and LCD TVs.
- How does the thermal shutdown feature work?
The thermal shutdown feature triggers when the junction temperature exceeds 170°C, tri-stating both VDDQ and VTT outputs until the temperature cools down to about 120°C.
