The JTMA7098, 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 JTMA7098, two-phase PWM control IC, provides a precision voltage regulation system for advanced graphic microprocessors in graphics card applications. The integration of power MOSFET drivers into the controller
IC and reduces the number of external parts for a cost and space saving power management solution.
The JTMA7098 uses a voltage-mode PWM architecture,operating with fixed-frequency, to provides 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,REFIN/EN or 5VCC pin to reset the IC. Such feature of the MODE pin makes the JTMA7098 ideally suitable for dual
power input applications, such as PCIE interfaced graphic cards.This control IC‘s protection features include a set of sophisticated over-temperature, over-voltage, under-voltage, and over-current protections. Over-voltage re-sults 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 function and a programmable soft-start
to prevent wrong operation and limit the input surge current during power-on or start-up.
The JTMA7098 is available in a QFN4x4-24A package
二.产品特点(Features)
1.）Voltage-Mode Operation with Current Sharing
Adjustable Feedback Compensation
Fast Load Transient Response
2.）Operate with 8V~13.2VCC Supply Voltage
3.）Selectable External or Internal 0.6V Reference
±1.5% Accuracy Over Temperature
4.）Support Single- and Two-Phase Operations
5.）5VCC and Buffered Reference Outputs
6.）8~12V Gate Drivers with Internal Bootstrap Diode
7.）Lossless Inductor DCR Current Sensing
8.）Selectable Operation Frequency
150k/300k/400kHz per Phase
9.）Power-OK Indicator Output
Regulated 1.5V on REFOUT/POK
10.）Adjustable Over-Current Protection (OCP)
11.）Accurate Load Line (DROOP) Programming
12.）Adjustable Soft-Start
13.）Over-Voltage Protection (OVP)
14.）Under-Voltage Protection (UVP)
15.）Over-Temperature Protection (OTP)
16.）QFN4x4 24-Lead Package (QFN4x4-24A)
17.）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 PowerSupply
On-board High Power PWM Converter with Out-

put Current up to 60A

四.下载产品资料PDF文档

JTMA7098