The JTMA7158 has two synchronous buck PWM control-lers with

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 JTMA7158 has two synchronous buck PWM control-lers with high
precision internal references voltage to of-fer accurate outputs. The PWM
controllers are designed to drive two N-channel MOSFETs in synchronous
buck topology. The device requires 12V and 5V power supplies.If the 5V
supply is not available, the device can offer an optional shunt regulator
5.8V for 5V supply.Both outputs have independent soft-start and enable
func-tions combined on the SS/EN pin. Connecting a capaci-tor from each
SS/EN pin to the ground for setting the soft-start time, and pulling the SS/EN
pin voltage below 1V to disable regulator. The device also offers 180°phase
shift function between OUT1 and OUT2.The default switching frequency is
300kHz (keep the FS pin open or short to GND), and the device also provides
the programmable switching frequency function to ad-just the switching frequency
from 70kHz to 800kHz. Con-necting a resistor from FS pin to GND increases the
switching frequency. Conversely, connecting a resistor from FS pin to VCC12
decreases the switching frequency.There is no current sensing or under-voltage
sensing on the JTMA7158. However, it provides a simple short-circuit protection by monitoring the COMP1 pin and COMP2 pin for over-voltage. When any of two pins
exceed their trip point and the condition keeps for 1-2 internal clock cycles (3-6us at
300kHz), all regulators are latched off.

二.产品特点(Features)
1.)Two Synchronous Buck Converters(OUT1,OUT2)
2.)Converter Input Voltage Range up to 12V
3.)0.6V Reference for OUT1 with 0.8% Accuracy
4.)3.3V Reference for OUT2 with 0.8% Accuracy
5.)Both Outputs have Independent Soft-Start and
Enable Functions
6.)Internal 300kHz Oscillator and Programmable
Frequency Range from 70 kHz to 800kHz
7.)180 Degrees Phase Shift etween OUT1 and OUT2
8.)Short-Circuit Protection
9.)Thermally Enhanced SOP-20 Package
10.)Lead Free and Green Devices Available
(RoHS Compliant)

三,应用范围 (Applications)
Graphic Cards
Low-Voltage Distributed Power Supplies
SMPS Application

四.下载产品资料PDF文档

JTMA7158

五,产品封装图 (Package)

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