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目录
一,产品概述(General Description)
The JTM2259A is a synchronous step-down DC/DC converter that provides wide 4.5V to 21V input voltage range and 2A continuous load current capability.
The JTM2259A fault protection includes cycle-by-cycle current limit, UVLO, output overvoltage protection and thermal shutdown. The adjustable soft-start
function prevents inrush current at turn-on. This device uses current mode control scheme which provides fast transient response. Internal compensation function reduces external compensation components and simplifies the design
process. In shutdown mode, the supply current is less than 1μA.
The JTM2259A is available in SOT-23-6 package and provides good thermal conductance.
二.产品特点(Features)
High Efficiency up to 94%
Low RDS(ON) Integrated Power MOSFET
Internal Compensation Function
Wide Input Voltage Range: 4.5V to 21V
Adjustable Output Voltage from 0.8V to 17.85V
2A Output Current
Fixed 600KHz Switching Frequency
Current Mode Operation
Cycle-by-Cycle Current Limit
Over-Temperature Protection with Auto Recovery
Output Overvoltage Protection
Under Voltage Lockout
<1μA Shutdown Current
SOT-23-6 Package
三,应用范围 (Applications)
STB (Set-Top-Box)
LCD Display, TV
Distributed Power System
Networking, XDSL Modem
四.技术规格书下载（产品PDF）
五,产品封装图 (Package)
|
I/O |
Pin Name |
Pin No. |
Pin Function |
|
I |
FB |
3 |
Voltage Feedback Input Pin. Connect FB and VOUT with a resistive voltage divider. This IC
senses feedback voltage via FB and regulates it at 0.8V. |
|
I |
VIN |
5 |
Power Supply Input Pin. Drive VIN pin by 4.5V to 21V voltage to power on the chip. |
|
I |
|
4 |
Enable Input Pin. This pin is a digital control input which turns the converter on or off. Connect to
VIN with a 100kΩ resistor for self-startup. |
|
I |
GND |
2 |
Ground Pin. |
|
O |
LX |
6 |
Power Switching Output. LX is the output of the internal high side NMOS switch. |
|
O |
BST |
1 |
High Side Gate Drive Boost Pin. A capacitor rating between 10nF~100nF must be connected from
this pin to LX. It can boost the gate drive to fully turn on the internal high side NMOS. |
六.电路原理图
|
VOUT |
C1 |
R1 |
R2 |
C9 |
C4 |
L1 |
C2 |
|
1.2V |
10μF MLCC x2 |
4.99kΩ |
10kΩ |
-- |
200pF~1nF |
2.2μH |
22μF MLCC x2 |
|
1.8V |
10μF MLCC x2 |
4.99kΩ |
3.92kΩ |
-- |
200pF~1nF |
2.2μH |
22μF MLCC x2 |
|
2.5V |
10μF MLCC x2 |
4.99kΩ |
2.32kΩ |
-- |
200pF~1nF |
4.7μH |
22μF MLCC x2 |
|
3.3V |
10μF MLCC x2 |
30.9kΩ |
9.76kΩ |
-- |
200pF~1nF |
4.7μH |
22μF MLCC x2 |
|
5V |
10μF MLCC x2 |
30.9kΩ |
5.76kΩ |
-- |
200pF~1nF |
4.7μH |
22μF MLCC x2 |
|
1.2V |
100μF EC x1 |
4.99kΩ |
10kΩ |
0.1μF |
-- |
2.2μH |
100μF EC x1 |
|
1.8V |
100μF EC x1 |
4.99kΩ |
3.92kΩ |
0.1μF |
-- |
2.2μH |
100μF EC x1 |
|
2.5V |
100μF EC x1 |
4.99kΩ |
2.32kΩ |
0.1μF |
-- |
4.7μH |
100μF EC x1 |
|
3.3V |
100μF EC x1 |
30.9kΩ |
9.76kΩ |
0.1μF |
-- |
4.7μH |
100μF EC x1 |
|
5V |
100μF EC x1 |
30.9kΩ |
5.76kΩ |
0.1μF |
-- |
4.7μH |
100μF EC x1 |
七,功能概述
Absolute Maximum Ratings (Note 1)
● Supply Voltage VIN ------------------------------------------------------------------------------------------- -0.3V to +23V
● Enable Voltage SH------------------------------------------------------------------------------------- -0.3V to +23V
● LX Voltage VLX (50ns) -------------------------------------------------------------------------------------- -1V to VIN+0.3V
● BST Pin Voltage VBST -------------------------------------------------------------------------------------- VLX-0.3V to VLX+6V
● All Other Pins Voltage ------------------------------------------------------------------------------------- -0.3V to +6V
● Maximum Junction Temperature (TJ) ------------------------------------------------------------------ +150°C
● Storage Temperature (TS) -------------------------------------------------------------------------------- -65°C to +150°C
● Lead Temperature (Soldering, 10sec.) ---------------------------------------------------------------- +260°C
● Package Thermal Resistance, (θJA)
SOT-23-6 -------------------------------------------------------------------------------------------- +250°C/W
● Package Thermal Resistance, (θJC)
SOT-23-6 -------------------------------------------------------------------------------------------- +110°C/W
八,相关芯片选择指南
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DC-DC降压IC |
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型号 |
输入耐压 |
输出电压 |
输出电流 |
反馈电压 |
工作频率 |
效率 |
静态 |
待机电流 |
封装 |
|
工作电流 |
|
LM2596 |
45V |
5.0V/可调输出 |
3A |
1.23V |
150K |
90% |
10mA |
80uA |
TO-263-5L |
|
/3.3/12V |
(Max) |
TO-220-5L |
|
LM2576 |
45V |
5.0V/可调输出 |
3A |
1.23V |
50K |
90% |
10mA |
80uA |
TO-263-5L |
|
/3.3/12V |
(Max) |
TO-220-5L |
|
JTM1507 |
45V |
5.0V/可调输出 |
3A |
1.23V |
380K |
73% |
2mA |
0.2uA |
TO-252-5L |
|
MP1410 |
27V |
可调输出 |
2A |
1.22V |
420K |
95% |
1mA |
25uA |
SOP8 |
|
JTM1509 |
45V |
5.0V/可调输出 |
2A |
1.23V |
150K |
82% |
2mA |
80uA |
SOP8 |
|
3.3V/12V |
|
JTM1513 |
20V |
可调输出 |
2A |
0.8V |
150K |
89% |
2mA |
1uA |
SOP-8 |
|
JTM1530 |
20V |
可调输出 |
3A |
0.8V |
380K |
88% |
3mA |
1uA |
SOP-8 |
|
JTM1583 |
28V |
可调输出 |
3A |
1.22V |
380K |
89% |
3mA |
1uA |
SOP-8 |
|
JTM3111 |
42V |
可调输出 |
3A |
0.8V |
50-500K |
91% |
3mA |
150uA |
ESOP8 |
|
JTM3112 |
40V |
可调输出/ |
2A |
1.18V |
110K |
93% |
10mA |
2mA |
SOP8 |
|
带CC/CV模式 |
|
JTM3113B |
40V |
可调输出/ |
2.5A |
1.0V |
250K |
91% |
10mA |
2mA |
ESOP8 |
|
带CC/CV模式 |
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JTM3101 |
45V |
可调输出/ |
2A |
1.235V |
150K |
83% |
2.0mA |
|
ESOP8 |
|
带CC模式 |
|
JTM3102 |
45V |
可调输出/ |
3A |
1.25V |
150K |
89% |
2.0mA |
|
ESOP8 |
|
带CC模式 |
|
JTM3109 |
40V |
可调输出/ |
3A |
1.25V |
180K |
89% |
2.1mA |
|
SOP8 |
|
带CC/CV模式 |
|
JTM3108 |
40V |
可调输出/ |
3.5A |
1.25V |
180K |
87% |
2.1mA |
|
ESOP8 |
|
带CC/CV模式 |
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JTM4523 |
40V |
可调输出/ |
3A |
0.8V |
225K |
92% |
2.84mA |
75uA |
ESOP8 |
|
带CC/CV模式 |
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JTM3501 |
50V |
5V固定输出 |
1.8A |
|
150K |
90% |
4.7mA |
|
SOP-8 |
|
JTM3511 |
50V |
5V固定输出 |
2.1A |
|
150K |
90% |
4.7mA |
|
SOP-8 |
|
JTM3512 |
50V |
5V固定输出 |
2.4A |
|
150K |
89% |
4.7mA |
|
SOP-8 |
|
JTM3513 |
50V |
5V固定输出 |
3.2A |
|
150K |
87% |
4.7mA |
|
TO-252-5L |
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大电流DC-DC降压IC |
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型号 |
输入耐压 |
输出电压 |
输出电流 |
反馈电压 |
工作频率 |
效率 |
静态工作电流 |
待机电流 |
封装 |
|
JTM3103 |
40V |
可调输出 |
4A |
1.25V |
180K |
94% |
2.1mA |
|
TO-252-5L |
|
JTM3104 |
36V |
可调输出 |
5A |
1.22V |
240K |
95% |
3.6mA |
|
TO-263-5L |
|
JTM3105 |
40V |
可调输出 |
5A |
1.25V |
180K |
96% |
2.1mA |
|
TO-263-5L |
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JTM3115 |
40V |
可调输出 |
5A |
1.25V |
150K |
86% |
2mA |
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TO-263-5L |
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带CC/CV模式 |
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耐高压DC-DC降压IC |
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型号 |
输入耐压 |
输出电压 |
输出电流 |
反馈电压 |
工作频率 |
效率 |
静态工作电流 |
待机电流 |
封装 |
|
JTM3107 |
75V |
可调输出 |
1.2A |
1.25V |
180K |
92% |
3mA |
|
SOP8 |
|
JTM3107B |
85V |
可调输出 |
0.4A |
1.25V |
150K |
85% |
2.5mA |
|
SOP8 |
|
JTM3110 |
93V |
可调输出 |
1A |
1.25V |
150K |
83% |
4.5mA |
|
TO252-5L |
|
JTM3110B |
85V |
可调输出 |
0.8A |
1.25V |
150K |
85% |
2.5mA |
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TO252-5L |
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我司的LM2596有如下优点： |
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1.最大可达3.5A-4A驱动电流 |
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2.耐压可达45V. |
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3.和市场低端的那种只有1A电流的不同。 |
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我司的LM2576有如下优点： |
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1.最大可达3A驱动电流 |
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2.耐压可达45V. |
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3.和市场低端的那种只有1A电流的不同。 |
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产品应用： |
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1.液晶电视/液晶显示器 |
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2.车充 |
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3.PDVD/车载DVD/汽车音响 |
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4.小家电、家电控制板 |
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低压同步DC-DC降压IC |
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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 |
|
电流 |
电压 |
频率 |
工作电流 |
电流 |
|
JTM3406 |
2.0V--6.0V |
1.2V/1.8V/3.3V |
0.7A |
0.6V |
1.5MHz |
96% |
20uA |
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SOT-25 |
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可调输出 |
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JTM3416 |
2.0-6.0V |
可调输出 |
1.0A |
0.6V |
1.5M |
96% |
20uA |
1uA |
SOT-25 |
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JTM3416A |
2.3-6.0V |
可调输出 |
1.2A |
0.6V |
1.5M |
96% |
35uA |
1uA |
SOT-25 |
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JTM3416B |
2.3-6.0V |
可调输出 |
1.5A |
0.6V |
1.5M |
96% |
35uA |
1uA |
SOT-25 |
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JTM3420 |
2.0-6.5V |
可调输出 |
2.0A |
0.6V |
1.5M |
96% |
40uA |
1uA |
SOT-26 |
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JTM3420B |
2.6-6.0V |
可调输出 |
2.0A |
0.6V |
3M |
96% |
30uA |
0.1uA |
SOT-25 |
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JTM3420S |
2.3-6.5V |
可调输出 |
2.0A |
0.6V |
1.5M |
96% |
40uA |
40uA |
SOP-8 |
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JTM3430S |
2.3-6.5V |
可调输出 |
3.0A |
0.6V |
1.5M |
95% |
40uA |
40uA |
ESOP-8 |
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高压同步DC-DC降压IC |
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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 |
|
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 |
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MP1482 |
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JTM1482A |
4.5-27V |
可调输出 |
2.0A |
0.925V |
340K |
96% |
1.3mA |
0.3uA |
SOP-8 |
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JTM1484 |
4.6-22V |
可调输出 |
3.0A |
0.923V |
340K |
95% |
55uA |
1uA |
ESOP8 |
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MP1484 |
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JTM1484A |
4.5-27V |
可调输出 |
3.0A |
0.925V |
340K |
93% |
1.3mA |
0.3uA |
ESOP8 |
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JTM1486 |
3.6-40V |
可调输出 |
2.0A |
0.8V |
440K |
94% |
74uA |
0.07uA |
ESOP-8 |
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JTM1488 |
4.5-20V |
可调输出 |
4.0A |
0.923V |
340KHz |
95% |
1.6mA |
6uA |
ESOP8 |
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JTM2259 |
4.5-16V |
可调输出 |
2.0A |
0.6V |
600K |
96% |
400uA |
1uA |
SOT-26 |
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JTM2359 |
4.5-26V |
可调输出 |
1.2A |
0.8V |
1.4M |
94% |
600uA |
1uA |
SOT-26 |
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JTM2459 |
4.0-42V |
可调输出 |
1.5A |
0.8V |
650K |
91% |
600uA |
6uA |
SOT-26 |
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双路同步DC-DC降压IC |
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型号 |
输入耐压 |
输出电压 |
输出电流 |
反馈电压 |
工作频率 |
效率 |
静态工作电流 |
待机电流 |
封装 |
|
JTM8021 |
3.0V-6.0V |
双路可调 |
1.5A |
0.6V |
1.5MHz |
90% |
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10uA |
ESOP-8 |
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JTM8022 |
2.3V-6.0V |
双路可调 |
2A |
0.6V |
1.5MHz |
90% |
150uA |
0.1uA |
ESOP-8 |
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