The JTMA7088, two-phase PWM control IC, provides a precision

1.产品概述 2.产品特点 3.应用范围 4.下载产品资料PDF文档
5.产品封装图 6.电路原理图 7.功能概述 8.相关产品

一,产品概述(General Description)
The JTMA7088, two-phase PWM control IC, provides a precision voltage regulation system for advanced graphic microprocessors in graphics card applications. The inte-gration of power MOSFET drivers into the controller IC
reduces the number of external parts for a cost and space saving power management solution.
The JTMA7088 uses a voltage-mode PWM architecture,operating with fixed-frequency, to provide excellent load transient response. The device uses the voltage across the DCRs of the inductors for current sensing. Load line
voltage positioning (DROOP), channel-current balance,and over-current protection are accomplished through continuous inductor DCR current sensing.
The MODE pin programs single- or two- phase operation.When IC operates in two-phase mode normally, it can transfer two-phase mode to single phase mode at liberty.Nevertheless, once operates in single-phase mode, the operation mode is latched. It is required to toggle SS or 5VCC pin to reset the IC. Such feature of the MODE pin makes the JTMA7088 ideally suitable for dual power input applications, such as PCIE interfaced graphic cards. This control IC‘s protection features include a set of so- phisticated over-temperature, over-voltage, under-voltage, and over-current protections. Over-voltage results in the converter turning the lower MOSFETs on to clamp the rising output voltage and protects the microprocessor.The over-current protection level is set through external
resistors. The device also provides a power-on-reset func-tion and a programmable soft-start to prevent wrong op-eration and limit the input surge current during power-on or start-up.
The JTMA7088 is available in a QFN4x4-24A package

二.产品特点(Features)
Voltage-Mode Operation with Current Sharing
- Adjustable Feedback Compensation
- Fast Load Transient Response
Operate with 8V~13.2 VCC Supply Voltage
Programmable 3-Bit DAC Reference
-±1.5% System Accuracy Over-Temperature
Support Single- and Two-Phase Operations
5V Linear Regulator Output on 5VCC
8~12V Gate Drivers with Internal Bootstrap Diode
Lossless Inductor DCR Current Sensing
Fixed 300kHz Operating Frequency Per Phase
Power-OK Indicator Output
- Regulated 1.5V on POK
Adjustable Over-Current Protection (OCP)
Accurate Load Line (DROOP) Programming
Adjustable Soft-Start
Over-Voltage Protection (OVP)
Under-Voltage Protection (UVP)
Over-Temperature Protection (OTP)
QFN4x4 24-Lead Package (QFN4x4-24A)
Lead Free and Green Devices Available
(RoHS Compliant)

三,应用范围 (Applications)

Graphics Card GPU Core Power Supply
Motherboard Chipset or DDR SDRAM Core Power Supply
On-Board High Power PWM Converter with

Output Current up to 60A

四.下载产品资料PDF文档

JTMA7088

五,产品封装图 (Package)

六.电路原理图