The JTMT208/JTMT209 series is a synchronous step-down micro

1.产品概述 2.产品特点 3.应用范围 4.技术规格书下载（产品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 JTMT208/JTMT209 series is a synchronous step-down micro DC/DC converter which integrates an
inductor and a control IC in one tiny package (2.5mm×2.15mm, h=1.05mm). A stable power supply with an
output current of 400mA is configured using only two capacitors connected externally.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 1.8V (2.0V) to 6.0V enables support for applications that require an alkaline
battery (2-cell) or AC adapter (5V) power supply. An internally fixed output voltage (0.8V to 4.0V) or an externally
set output voltage can be selected.
The JTMT208/JTMT209 series uses synchronous rectification at an operating frequency of 3.0MHz. PWM
control (JTMT208) or automatic PWM/PFM switching control (JTMT209) can be selected. The JTMT208 series
has a fixed frequency, enabling the suppression of output ripple. The JTMT209 series achieves high efficiency
while holding down output ripple across the full range of loads, from light to heavy, enabling the extension of
battery operation time.Soft start and on/off functions with CL discharge are provided, and the IC can be put in
the standby state by inputting a Low level signal into the CE pin.
二.产品特点(Features)

Input Voltage : 1.8V ~ 6.0V (Type F)
: 2.0V ~ 6.0V (Type A/B)
Fixed Output Voltage : 0.8V ~ 4.0V (±2.0%)
High Efficiency : 90% (VIN=4.2V, VOUT=3.3V)
Output Current : 400mA
Oscillation Frequency : 3.0MHz (±15%)
CE Function : Active High Soft-start Circuit Built-in CL High Speed Auto Discharge
Protection Circuits : Current Limiter Built-in (Constant Current & Latching)
Control Methods : PWM (XCL208) PWM/PFM (XCL209)
Operating Ambient Temperature : -40℃～+85℃ Package : USP-10B03
Environmentally Friendly : EU RoHS Compliant, Pb Free
三,应用范围 (Applications)

●Mobile phones, Smart phones
●Bluetooth Headsets
●Tablet PCs
●PND
●PC peripheral devices
●DSC, Camcorders
四.技术规格书下载（产品PDF）

JTMT208/JTMT209 Series

五,产品封装图 (Package)

JTMT208/JTMT209 Series PIN CONFIGURATION

PIN NAMEFUNCTIONS
4

PIN NUMBER	PIN NAME	FUNCTIONS
USP-10B03	PIN NAME	FUNCTIONS
1
PVSS	(Power) Ground
2	LX	Switching Output
3	NC	No Connection
4	FB	Output Voltage Sense Pin (Type F)
4	VOUT	Fixed Output Voltage Pin (Type A/B)
5	AVSS	(Analog) Ground
6	CE	Active High Enable
7	NC	No Connection
8	VIN	Power Supply Input
9	L1	Inductor Electrodes
10	L2	Inductor Electrodes

六.电路原理图

七,功能概述

PARAMETER	SYMBOL	RATINGS	UNITS
Input Voltage	VIN	-0.3～6.5	V
Lx Pin Voltage	VLx	-0.3～VIN+0.3≦6.5	V
Output Voltage	VOUT	-0.3～6.5	V
FB Pin Voltage	VFB	-0.3～6.5	V
CE Input Voltage	VCE	-0.3～6.5	V
Lx Pin Current	ILX	±1500	mA
(*1) Power Dissipation	Pd	500	mW
Operating Ambient Temperature	Topr	-40～+85	℃
Storage Temperature	Tstg	-40～+125	℃

八,相关芯片选择指南

系列名称	特点	输入电压		输出电压		最大输出电流	振荡频率	内置FET	封装
		(V)		(V)		(mA)
		最小	最大	最小	最大
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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