UCD7242
- Fully Integrated Power Switches With Drivers
for Dual Synchronous Buck Converters - Full Compatibility With TI Fusion Digital Power Supply
Controllers, Such as the UCD92xx Family - Wide Input Voltage Range: 4.75 V to 18 V
Operational Down to 2.2 V Input With an External Bias Supply - Up to 10A Output Current per Channel
- Operational to 2 MHz Switching Frequency
- High Side Current Limit With Current Limit Flag
- Onboard Regulated 6 V Driver Supply From VIN
- Thermal Protection
- Temperature Sense Output – Voltage Proportional to Chip Temperature
- UVLO and OVLO Circuits Ensure Proper Drive Voltage
- Rated From –40°C to 125°C Junction Temperature
- RoHS Compliant
- Accurate On-Die Current Sensing (±5%)
- APPLICATIONS
- Digitally-Controlled Synchronous-Buck Power Stages
- High Current Dual-Phase VRM/EVRD Regulators for Desktop, Server, Telecom and
Notebook Processors
The UCD7242 is a complete power system ready to drive two independent buck power supplies. High side MOSFETs, low side MOSFETs, drivers, current sensing circuitry and necessary protection functions are all integrated into one monolithic solution to facilitate minimum size and maximum efficiency. Driver circuits provide high charge and discharge current for the high-side NMOS switch and the low-side NMOS synchronous rectifier in a synchronous buck circuit. The MOSFET gates are driven to +6.25 V by an internally regulated VGG supply. The internal VGG regulator can be disabled to permit the user to supply an independent gate drive voltage. This flexibility allows a wide power conversion input voltage range of 2.2V to 18V. Internal under voltage lockout (UVLO) logic ensures VGG is good before allowing chip operation.
The synchronous rectifier enable (SRE) pin controls whether or not the low-side MOSFET is turned on when the PWM signal is low. When SRE is high the part operates in continuous conduction mode for all loads. In this mode the drive logic block uses the PWM signal to control both the high-side and low-side gate drive signals. Dead time is also optimized to prevent cross conduction. When SRE is low, the part operates in discontinuous conduction mode at light loads. In this mode the low-side MOSFET is always held off.
On-board comparators monitor the current through the high side switch to safeguard the power stage from sudden high current loads. Blanking delay is set for the high side comparator to avoid false reports coincident with switching edge noise. In the event of an over-current fault, the high-side FET is turned off and the Fault Flag (FLT) is asserted to alert the controller.
MOSFET current is measured and monitored by a precision integrated current sense element. This method provides an accuracy of ±5% over most of the load range. The amplified signal is available for use by the controller on the IMON pin.
An on-chip temperature sense converts the die temperature to a voltage at the TMON pin for the controller’s use. If the die temperature exceeds 170°C, the temperature sensor initiates a thermal shutdown that halts output switching and sets the FLT flag. Normal operation resumes when the die temperature falls below the thermal hysteresis band.
技術文件
| 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | Digital Dual Synchronous-Buck Power Driver.. datasheet (Rev. B) | 2012年 8月 12日 | |
| Selection guide | Power Management Guide 2018 (Rev. R) | 2018年 6月 25日 |
設計與開發
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FUSION_DIGITAL_POWER_DESIGNER — 數位電源軟體
FUSION_MFR_GUI — Fusion Digital Power 製造工具
The MFR GUI supports the same devices as Fusion Digital Power Designer software. This tool is typically used in manufacturing (...)
TIDEP0036 — 使用 TMS320C6657 實作高效率 OPUS 轉碼器解決方案的參考設計
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| VQFN-HR (RSJ) | 32 | Ultra Librarian |
訂購與品質
- RoHS
- REACH
- 產品標記
- 鉛塗層/球物料
- MSL 等級/回焊峰值
- MTBF/FIT 估算值
- 材料內容
- 認證摘要
- 進行中持續性的可靠性監測
- 晶圓廠位置
- 組裝地點