Overview
The ADP3120AJRZ-RL, produced by onsemi, is a dual bootstrapped 12 V MOSFET driver designed to drive the gates of both high-side and low-side power MOSFETs in a synchronous buck converter topology. This driver is optimized for high current multi-phase buck regulators, particularly those converting a 12 V rail directly to the core voltage required by complex logic chips. It operates with a single PWM input signal to control both the high-side and low-side MOSFETs efficiently.
Key Specifications
| Characteristic | Condition | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply Voltage Range | VCC | 4.6 | - | 13.2 | V |
| Operating Ambient Temperature | TA | -20 | - | 85 | °C |
| Operating Junction Temperature | TJ | -20 | - | 150 | °C |
| Propagation Delay (tpdhDRVL) | CLOAD = 3.0 nF | 12 | - | 35 | ns |
| Transition Time (trDRVL) | CLOAD = 3.0 nF | 16 | - | 35 | ns |
| Undervoltage Lockout (UVLO) Startup | - | 3.9 | - | 4.5 | V |
| Undervoltage Lockout (UVLO) Shutdown | - | 3.7 | - | 4.3 | V |
Key Features
- Dual bootstrapped design to drive both high-side and low-side MOSFETs in a synchronous buck converter.
- Optimized for high current multi-phase buck regulators, especially for converting 12 V to core voltages for complex logic chips.
- Internal adaptive nonoverlap circuitry to reduce switching losses by preventing simultaneous conduction of both MOSFETs.
- Floating top driver design accommodates VBST voltages up to 35 V relative to PGND.
- Output disable feature to force DRVH and DRVL low when the OD pin is set low.
- Capable of driving a 3 nF load at frequencies up to 1 MHz.
- Bootstrap circuit with an external diode and capacitor for high-side driver gate voltage generation.
Applications
The ADP3120AJRZ-RL is primarily used in synchronous buck converter topologies, particularly in high current multi-phase buck regulators. These regulators are essential in power supply systems for complex logic chips, such as those found in computing and telecommunications equipment. The driver is also suitable for other applications requiring efficient and reliable MOSFET gate driving, such as DC-DC converters and power management systems.
Q & A
- What is the primary function of the ADP3120AJRZ-RL?
The ADP3120AJRZ-RL is a dual MOSFET driver designed to drive the gates of both high-side and low-side power MOSFETs in a synchronous buck converter topology.
- What is the operating voltage range of the ADP3120AJRZ-RL?
The ADP3120AJRZ-RL operates with a supply voltage range of 4.6 V to 13.2 V.
- What is the maximum operating ambient temperature for the ADP3120AJRZ-RL?
The maximum operating ambient temperature is 85°C.
- How does the ADP3120AJRZ-RL reduce switching losses?
The ADP3120AJRZ-RL reduces switching losses through internal adaptive nonoverlap circuitry, which prevents simultaneous conduction of both MOSFETs.
- What is the purpose of the bootstrap circuit in the ADP3120AJRZ-RL?
The bootstrap circuit generates the gate voltage for the high-side driver, using an external diode and capacitor referenced to the Switch Node (SW) pin.
- Can the ADP3120AJRZ-RL drive loads at high frequencies?
Yes, the ADP3120AJRZ-RL can drive a 3 nF load at frequencies up to 1 MHz.
- What is the function of the Output Disable (OD) pin?
The Output Disable (OD) pin, when set low, disables normal operation and forces DRVH and DRVL low.
- What type of MOSFETs does the ADP3120AJRZ-RL drive?
The ADP3120AJRZ-RL drives N-channel MOSFETs, both high-side and low-side, in a synchronous buck converter topology.
- What are the typical applications of the ADP3120AJRZ-RL?
The ADP3120AJRZ-RL is used in high current multi-phase buck regulators, especially for converting 12 V to core voltages for complex logic chips in computing and telecommunications equipment.
- What is the recommended capacitor value for the bootstrap circuit?
The recommended capacitor value for the bootstrap circuit is between 100 nF and 1.0 μF.
