中文
EnglishJTMT221/JTMT222 series is a synchronous step-down micro DC/DC converter ,integrates an inductor and a control IC in one tiny package,The power consumption will be less than 1.0μA
一,产品概述(General Description) 
The JTMT221/JTMT222 series is a synchronous step-down micro DC/DC converter which integrates an
inductor and a control IC in one tiny package (2.0mm×2.5mm, h=1.0mm). An internal coil simplifies the circuit
and enables minimization of noise and other operational trouble due to the circuit wiring. A wide operating
voltage range of 2.5V to 5.5V enables support for applications that require an internally fixed output voltage
(0.8V to 3.6V). The JTMT221/JTMT222 series uses synchronous rectification at an operating frequency
of 1.2MHz. The JTMT221/JTMT222 series uses HiSAT-COT (*) synchronous rectification. HiSAT-COT+PWM
control (JTMT221) or HiSAT-COT+automatic PWM/PFM switching control (JTMT222) can be selected.
The series have a high speed soft-start as fast as 0.25ms (TYP.) in typical for quick turn-on. With the built-in
UVLO (Under Voltage Lock Out) function, the internal P-channel driver transistor is forced OFF when input
voltage becomes 2.0V or lower. When CE=Low, theintegrated CL discharge function which enables the electric
charge at the output capacitor CL to be discharged via the internal discharge switch located between the LX
and PGND pins. The power consumption will be less than 1.0μA.
二</span>.产品特点(Features)
| nput Voltage | 2.5V～5.5V |
|---|---|
| Output Voltage | 0.8V～3.6V (±2.0%) |
| Oscillation Frequency | 1.2MHz |
| Output Current | 0.5A |
| Efficiency | 93% (VIN=5.0V,VOUT=3.3V/200mA) |
| Control Methods | HiSAT-COT制御 100% Duty Cycle PWM (JTMT221) PWM/PFM (JTMT222) |
| Circuit Protection | Thermal Shut Down Current Limit Circuit (Drop) Short Circuit Protection (Latch) |
| Functions | Soft-start Circuit Built-in UVLO CL Discharge |
| Output Capacitor | Low ESR Ceramic Capacitor |
| Operating Ambient Temperature | -40℃～+105℃</td> |
| Package | CL-2025-02 |
| Environmental Friendly | EU RoHS Compliant, Pb Free |
三</span>,应用范围 (Applications)
●Wearable Device
●Bluetooth Module
●SSD(Solid State Drive)
●Mobile phone
●Digital still camera
●Portable game devices
四.技术</span>规格书下载（产品PDF）</span>
 | JTMT221/JTMT222 |
| PIN NUMBER | PIN NAME | FUNCTIONS |
| 1 | Lx | Switching Output |
| 2 | AGND | Analog Ground |
| 3 | VOUT | Fixed Output Voltage PIN |
| 4 | CE | Chip Enable |
| 5 | PGND | Power Ground |
| 6 | VIN | Power Input |
| 7 | L1 | Inductor Electrodes |
| 8 | L2 | Inductor Electrodes |
六.电路原理图</span>
七</span>,功能概述
| PARAMETER | SYMBOL | RATINGS | UNITS |
| VIN Pin Voltage | VIN | -0.3 ~ + 6.2 | V |
| LX Pin Voltage | VLx | (*1) - 0.3 ~ VIN + 0.3 or + 6.2 | V |
| VOUT Pin Voltage | Vout | (*2) - 0.3 ~ VIN + 0.3 or + 4.0 | V |
| CE Pin Voltage | VCE | - 0.3 ~ + 6.2 | V |
| Power Dissipation | Pd | (*3) 1000 | mW |
| Operating Ambient Temperature | Topr | - 40 ~ + 105 | ℃</td> |
| Storage Temperature | Tstg | - 55 ~ + 125 | ℃</td> |
八,相关芯片选择指南
| 系列名称 | 特点 | 输入电压 | 输出电压 | 最大输出<a href="http://www.jtm-ic.com/a/xinwenzhongxin/" target="_blank" style="padding: 0px; margin: 0px; color: rgb(37, 110, 177); text-decoration: none;">电流 | 振荡频率 | 内置FET | 封装 | ||
| (V) | (V) | (mA) | |||||||
| 最小</td> | 最大</td> | 最小</td> | 最大</td> | ||||||
| JTMT101XCL | Inductor Built-in Step-up | 0.9 | 5.5 | 1.8 | 5 | 100 | 1.2MHz | P-ch FET | CL-2025 |
| N-ch FET | CL2025-02 | ||||||||
| JTMT201XCL | Inductor Built-in | 2 | 6 | 0.8 | 4 | 400 | 1.2MHz | N-ch FET | CL-2025 |
| JTMT202XCL | P-ch FET | CL2025-02 | |||||||
| JTMT205XCL | Inductor Built-in | 2 | 6 | 0.8 | 4 | 600 | 3.0MHz | N-ch FET | CL-2025 |
| JTMT206XCL | P-ch FET | CL2025-02 | |||||||
| JTMT207XCL | |||||||||
| JTMT208XCL | Inductor Built-in | 1.8 | 6 | 0.8 | 4 | 400 | 3.0MHz | N-ch FET | USP-10B03 |
| JTMT209XCL | P-ch FET | ||||||||
| JTMT210XCL | Inductor Built-in | 2 | 6 | 1 | 4 | - | - | Pch | CL2025-02 |
| Nch | |||||||||
| JTMT211XCL | Inductor Built-in | 2.7 | 6 | 0.9~VIN | 2000 | 2.4MHz | N-ch FET | USP-11B01 | |
| JTMT212XCL | P-ch FET | ||||||||
| JTMT213XCL | Inductor Built-in | 2.7 | 5.5 | 0.8 | 3.6 | 1500 | 3.0MHz | N-ch FET | USP-9B01 |
| JTMT214XCL | P-ch FET | ||||||||
| JTMT219XCL | Inductor Built-in | 2.5 | 5.5 | 0.8 | 3.6 | 1000 | 3.0MHz | N-ch FET | CL2025-02 |
| JTMT220XCL | P-ch FET | ||||||||
| JTMT221XCL | Inductor Built-in | 2.5 | 5.5 | 0.8 | 3.6 | 500 | 1.2MHz | N-ch FET | CL2025-02 |
| JTMT222XCL | P-ch FET | ||||||||
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