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目录
一,产品概述(General Description)
The JTM1486 is a current mode monolithic buck switching regulator. Operating with an input range of 3.6-40V, the JTM1486 delivers 2A of continuous output current with two integrated N-Channel MOSFETs.
The JTM1486 internal synchronous power switches provide high efficiency without
the use of an external Schottky diode. At light loads, regulators operate in low frequency to
maintain high efficiency and low output ripple. Current mode control provides tight load transient response and cycle-by-cycle current limit.
The JTM1486 guarantees robustness with short-circuit protection, thermal protection,
start-up current run-away protection, and input under voltage lockout.
The JTM1486 is available in 8-pin ESOP package, which provides a compact solution with
minimal external components. The package has an exposed pad for low thermal resistance
二.产品特点(Features)
3.6V to 40V operating input range
2A output current
Up to 94% efficiency
High efficiency (>78%) at light load
Internal Soft-Start
Fixed 120kHz Switching frequency
Input under voltage lockout
Available in thermally enhanced ESOP8
package
Start-up current run-away protection
Short circuit protection
Thermal protection
三,应用范围 (Applications)
1.Distributed Power Systems
2.Networking Systems
3.FPGA, DSP, ASIC Power Supplies
4.Green Electronics/ Appliances
5.Notebook Computers
四,下载产品资料PDF文档
五,产品封装图 (Package)
SOP8
Pin |
Name |
Description |
|
1 |
SW |
SW is the switching node that supplies power to the output. Connect the output LC filter from SW
to the output load. |
|
2 |
BST |
Bootstrap pin for top switch. A 0.01uF or larger capacitor should be connected between this pin
and the SW pin to supply current to the top switch and top switch driver. |
|
3 |
VD |
Output of the internal LDO. A capacitor of 2.2uF or larger should be connected at VD to ground. |
|
4 |
FB |
Output feedback pin. FB senses the output voltage and is regulated by the control loop to 0.8V.
Connect a resistive divider at FB. |
|
5 |
NC |
|
|
6 |
NC |
|
|
7 |
EN |
Drive EN pin high to turn on the regulator and low to turn off the regulator. |
|
8 |
VIN |
Input voltage pin. VIN supplies power to the IC. Connect a 3.6V to 40V supply to VIN and bypass
VIN to GND with a suitably large capacitor to eliminate noise on the input to the IC. |
|
9 |
GND |
Ground. |
六.电路原理图
七,功能概述
|
Item |
|
Symbol |
|
Condition |
|
Min. |
|
Typ. |
|
Max. |
|
Units |
VIN Undervoltage Lockout
Thershold |
VIN_MIN |
VIN falling |
|
3.6 |
|
V |
VIN Undervoltage Lockout
Hysteresis |
VIN_MIN_HYST |
VIN rising |
|
160 |
|
mV |
|
Shutdown Supply Current |
ISD |
VEN=0V |
|
0.07 |
|
μA |
|
Supply Current |
IQ |
VEN=5V, VFB=1V |
|
74 |
|
μA |
|
Feedback Voltage |
VFB |
3.6V<VVIN<40V |
|
0.8 |
|
V |
Error Amplifier
Transconductance |
GEA |
Vcomp = 1.5V |
|
250 |
|
uA/V |
Maximum COMP Sourcing
Current |
ICOMP_MAX_OUT |
Vcomp = 1V |
|
25 |
|
uA |
Maximum COMP Sinking
Current |
ICOMP_MAX_IN |
Vcomp = 3V |
|
25 |
|
uA |
|
Top Switch Resistance |
RDS(ON)T |
|
|
126 |
|
mΩ |
|
Bottom Switch Resistance |
RDS(ON)B |
|
|
63 |
|
mΩ |
|
Top Switch Leakage Current |
ILEAK_TOP |
VIN=40V, VEN=0V,
VSW=0V |
|
0.2 |
|
uA |
Bottom Switch Leakage
Current |
ILEAK_BOT |
VIN= VSW = 40V, VEN=0V |
|
0.7 |
|
uA |
|
Top Switch Current Limit |
ILIM_TOP |
Minimum Duty Cycle |
|
4.5 |
|
A |
|
Switch Frequency |
FSW |
RRT = 180k |
|
120 |
|
kHz |
|
Minimum On Time |
TON_MIN |
|
|
117 |
|
ns |
|
Minimum Off Time |
TOFF_MIN |
VFB=0V |
|
112 |
|
ns |
EN shut down threshold
voltage |
VEN_TH |
VEN falling, FB=0V |
|
1.2 |
|
V |
|
EN shut down hysteresis |
VEN_HYST |
VEN rising, FB=0V |
|
120 |
|
mV |
|
Thermal Shutdown |
TTSD |
|
|
132 |
|
°C |
八,相关产品
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型号 |
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输出电压 |
输出 |
反馈 |
工作 |
效率 |
静态 |
待机 |
封装 |
直接替换 |
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电流 |
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频率 |
工作电流 |
电流 |
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可调输出 |
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340K |
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可调输出 |
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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 |
MP1484/MP2307/APW7174/EUP3484 |
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MP1484 |
EUP3476/RT8272/AS5430/RT8250 |
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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 |
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JTM1488 |
4.5-20V |
可调输出 |
4.0A |
0.923V |
340KHz |
95% |
1.6mA |
6uA |
ESOP8 |
MP1484/MP2307/APW7174/EUP3484 |
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EUP3476/RT8272/AS5430/RT8250 |
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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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MP28367/RT8259 |
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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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MP28367/RT8259 |
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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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MP28367/RT8259 |
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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 |
直接替换 |
|
|
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 |
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同步DC-DC升降压IC. |
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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 |
|
|
JTM3440 |
PWM |
2.2V-5.5V |
可调 |
1.2V |
0.7A |
95% |
50uA |
1.15MHz |
MSOP-10 |
LTC3440/TPS61070 |
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DC-DC升降压IC |
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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 |
|
范围 |
电压 |
形式 |
精度 |
最大输出 |
电流 |
|
|
|
|
|
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 |
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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 |
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UP7534/TT9707/TCS9607 |
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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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UP7534/TT9707/TCS9607 |
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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 |
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|
0.65A |
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JTM9711A |
2.5V-5.5V |
2.1A |
25uA |
0.1uA |
80 moJTM |
1.7V |
4 KV |
400 uS |
SOT-25 |
RT9711 |
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