一,产品概述(General Description)         
       The JTM8022 is a 1.5MHz constant frequency current mode, dual high-efficiency PWM step-down converter.It is ideal for portable equipment requiring very high current up t o 2A each channel from single-cell Lithium-ion batteries while still achieving over 90%efficiency during peak load conditions. The JTM8022 also can run at 100% duty cycle for low dropout operation, extending battery life in portable systems while light load operation provides very low output
ripple for noise sensitive applications. The JTM8022 can supply up to 2A output load current each channel from a 2.3V to 6V input voltage and the output voltage
can be regulated as low as 0.6V. The high switching frequency minimizes the size of external components while keeping switching losses low. The internal slope
compensation setting allows the device to operate with smaller inductor values to optimize size and provide efficient operation. The device is available in a Pb-free, 8-Lead ESOP package and is rated over the -40°C to +85°C temperature range.
This device offers two operation modes, PWM control and PFM Mode switching control, which allows a high efficiency over the wider range of the load.

二.产品特点(Features)
1.)High Efficiency: Up to 96%
2.)1.5MHz Constant Frequency Operation
3.)Dual 2A Output Current
4.)No Schottky Diode Required
5.)2.3V to6V Input Voltage Range
6.)Output Voltage as Low as 0.6V
7.)100% Duty Cycle in Dropout
8.)Low Quiescent Current:40μA
9.)Short Circuit Protection
10.)Thermal Fault Protection
11.)Inrush Current Limit and Soft Start
12.)<1μA Shutdown Current
13.)ESOP8 package

三,应用范围 (Applications)
1.)Set Top Box
2.)Wireless and DSL Modems
3.)PDAs
4.)Computer Peripherals
5.)Portable Instruments
6.)Digital Still and Video Cameras

四.下载产品资料PDF文档

jtm8022

五,产品封装图 (Package)

PIN	NAME	FUNCTION
1	VIN1	Power Input of Channel1
2	LX1	Pin for Switching of Channel1
3	VIN2	Power Input of Channel2
4	LX2	Pin for Switching of Channel2
5	EN2	Chip Enable of Channel2
6	FB2	Feedback Input of Channel2
7	EN1	Chip Enable of Channel1
8	FB1	Feedback Input of Channel1
	GND	Ground, The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation.

六.电路原理图


七,功能概述
The JTM8022 is a dual high output current monolithic
switch mode step-down DC-DC converter. The
device operates at a fixed 1.5MHz switching
frequency, and uses a slope compensated current
mode architecture. This step-down DC-DC converter
can supply up to dual respective 2000mA output
current at VIN = 3.6V and has an input voltage range
from 2.3V to 6V. It minimizes external component
size and optimizes efficiency at the heavy load
range. The slope compensation allows the device to
remain stable over a wider range of inductor values
so that smaller values (1μH to 4.7μH) with lower
DCR can be used to achieve higher efficiency. Only
a small bypass input capacitor is required at the
output. The adjustable version can be programmed
with external feedback to any voltage, ranging from
0.6V to nearly the input voltage. It uses internal
MOSFETs to achieve high efficiency and can
generate very low output voltages by using an
internal reference of 0.6V. At dropout, the converter
duty cycle increases to100% and the output voltage
tracks the input voltage minus the low RDS(ON)
drop of the P-channel high-side MOSFET and the
inductor DCR. The internal error amplifier and
compensation provides excellent transient response,
load and line regulation. Internal soft start eliminates
any output voltage overshoot when the enable or the
input voltage is applied.
八,相关产品

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型号	输入耐压	输出电压	输出	反馈	工作	效率	静态	待机	封装	直接替换
			电流	电压	频率		工作电流	电流
JTM1482	4.6-22V	可调输出	2.0A	0.923V	340K	94%	55uA	1uA	SOP-8	MP1482/ZT7182/LSP5502
MP1482										EUP3482/AS5422/AME5269
JTM1482A	4.5-27V	可调输出	2.0A	0.925V	340K	96%	1.3mA	0.3uA	SOP-8	MP1482/ZT7182/LSP5502
										EUP3482/AS5422/AME5269
JTM1484	4.6-22V	可调输出	3.0A	0.923V	340K	95%	55uA	1uA	ESOP8	MP1484/MP2307/APW7174/EUP3484
MP1484										EUP3476/RT8272/AS5430/RT8250
JTM1484A	4.5-27V	可调输出	3.0A	0.925V	340K	93%	1.3mA	0.3uA	ESOP8	MP1484/MP2307/APW7174/EUP3484
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JTM1486	3.6-40V	可调输出	2.0A	0.8V	440K	94%	74uA	0.07uA	ESOP-8
JTM1488	4.5-20V	可调输出	4.0A	0.923V	340KHz	95%	1.6mA	6uA	ESOP8	MP1484/MP2307/APW7174/EUP3484
										EUP3476/RT8272/AS5430/RT8250
JTM2259	4.5-16V	可调输出	2.0A	0.6V	600K	96%	400uA	1uA	SOT-26	MP2259/MP2359/ACT4088
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JTM2359	4.5-26V	可调输出	1.2A	0.8V	1.4M	94%	600uA	1uA	SOT-26	MP2359/MP2259/ACT4088
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JTM2459	4.0-42V	可调输出	1.5A	0.8V	650K	91%	600uA	6uA	SOT-26	MP2359/MP2259/ACT4088
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JTM8021	3.0V-6.0V	双路可调	1.5A	0.6V	1.5MHz	90%		10uA	ESOP-8	SY8021/L
JTM8022	2.3V-6.0V	双路可调	2A	0.6V	1.5MHz	90%	150uA	0.1uA	ESOP-8	SY8022/L
同步DC-DC升降压IC.
型号	工作模式	工作电压范围	输出电压	反馈电压	输出电流	效率	静态电流	工作频率	封装	直接替代型号
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DC-DC升降压IC
型号	工作模式	工作电压	输出	输出电压	输出电压	内置MOS	效率	静态	工作频率	封装	直接替代型号
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						电流
JTM6297	PWM	3.6V-26V	最大60V	可调输出	±2%	2A	90%	70uA	400KHz	SOP-8
JTM6298	PWM	3.6V-36V	最大60V	可调输出	±2%	3A	92%	70uA	400KHz	TO252-5L
JTM6299	PWM	5V-45V	最大60V	可调输出	±2%	5A	94%	70uA	220KHz	TO263-5L
型号	工作电压	电流限制	静态电流	截止电流	内阻	欠压锁定电压	抗静电电压	响应时间	封装	替代型号
JTM4610H/L	2.4V-5.5V	1A可调	15uA	1uA	80 moJTM	1.8V	2 KV	2 uS	SOT-25	AAT4610/SY6280/LPW5202/6/
										EUP3510/1TCS9107/TT9107
										UP7534/TT9707/TCS9607
JTM9703	2.0V-6.5V	2.1A可调	40uA	1uA	70 moJTM	1.7V	8 KV	4.6 mS	SOT-25	AAT4610/SY6280/LPW5202/6
										EUP3510/1/TCS9107/TT9107/
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JTM9701	2.2V-6.0V	1.1A	23uA	0.1uA	100 moJTM	1.8V	6KV	400uS	SOT-25	RT9701
JTM9715A/C/D	2.5V-5.5V	2.1A/1.0A	25uA	0.1uA	80 moJTM	1.7V	4 KV	400 uS	SOT-25	RT9715
		0.65A
JTM9711A	2.5V-5.5V	2.1A	25uA	0.1uA	80 moJTM	1.7V	4 KV	400 uS	SOT-25	RT9711
型号	工作电压	通道	工作电流	Divider 1	Divider 2	Divider 3	三星	BC1.2	CTIS YD/T	封装	直接替换
				协议	协议	协议	协议	DCP	1591-2009
JTM7901	4.5-5.5V	单通道/最大2.4A	140uA	支持	支持	支持	支持	支持	支持	SOT-25	VP201
JTM7902	4.5-5.5V	2通道/最大2.0A	140uA	支持	支持	不支持	支持	支持	支持	SOT-26	VP202
JTM7902A	4.5-5.5V	2通道/最大2.4A	140uA	不支持	不支持	支持	支持	支持	支持	SOT-26	VP202
实时时钟日历IC
型号	工作电压	工作电流	晶振频率	最大工作时钟频率	RAM空间	IC接口	工作温度范围	封装	代替型号
JTM8563	1.8V-5.5V	800uA/FE=1	32.768KHz	400KHz	16*8	I2C接口	-40～85度	SOP8	PCF8563
								MSOP8
JTM1302	1.3V-5.5V	1.2mA/Vcc=5V	32.768KHz	2MHz/Vcc=5V	31*8	串行3线接口	-45～85度	SOP8	DS1302
JTM1307	4.5V-5.5V	0.2mA/Vcc=5V	32.768KHz		56*8	标准IIC接口	-45～85度	SOP8	DS1307
我司的JTM8563/SOP8&MSOP8的优点是：
1.超低功耗，采用限振幅振荡结构，抗干扰能力强，低启动工作电压。
2.宽工作电压范围：1.8～5.5V
3.低休眠电流典型值为0.25μA
4.具有世纪标志，可工作于1900-2099年
5. I2C总线频率最高达可400KHz
6.时钟输出的频率可编程选择:32.768KHz/1024Hz/32Hz/1Hz 6.内含报警和定时器
7. 具备低电压检测和上电复位失效功能
8. 可直接替换原装的PCF8563
9. 可用于MID/MP3&MP4&MP5/手机/便携仪器/电信计费/考勤机/门禁等与计时有关的电子产品中。