Step-Up DC/DC Converter-LED Backlight Driver

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 JTMT9133 series is a fixed frequency, constant current step-up DC/DC converter which is optimized for LED backlight,
applications in mobile phones, PDAs and digital cameras. Output voltage of up to 17.5V is possible so that four white LEDs,can be
driven in series. Since the LED current is set by only one external resisto.all white LEDs placed in series can be turned,on at the
same time. The new DC/DC Converter is also able to drive a network of two parallel banks of three LEDs. LED dimming is
controlled by adjusting the duty cycle of a PWM signal (10kHz Max.) applied to the CE pin.Efficiency is high with a 0.2V low feedback
reference voltage ensuring the RLED losses are minimal. In addition, an internal,MOSFET with a low RDSON of 2.4Ω is used. A low
profile and small board area solution can be achieved using a chip inductor,and a small ceramic output capacitor CL=0.22μF as
a result of the high 1MHz switching frequency.
If white LEDs are opened or damaged, the detector built in the Lx pin causes the IC to stop oscillating, preventing eJTMTessive
,increase of the output voltage.
二.产品特点(Features)

Input Voltage Range	2.5V~6.0V
Output Voltage Range	Up to 17.5V externally set-up, Reference voltage 0.2V +5%
Oscillation Frequency	1.0MHz±20%
ON Resistance	2.4Ω
High Efficiency	85%, 3 white LEDs in series, VIN=3.6V, ILED=20mA
Control	PWM control
Stand-by Current	ISTB=1.0μA (MAX.)
Output Capacitor	0.22μF, ceramic
Lx Limit Current	360mA(TYP.)
Lx Overvoltage Limit	19V (TYP.)
Packages	SOT-25

三,应用范围 (Applications)

●For White LED drivers
●Smart phones / Mobile phones
●Mobile devices / terminals
●Digital still cameras
四.技术规格书下载（产品PDF）

JTMT9133

五,产品封装图 (Package)

六.电路原理图

七,功能概述

PARAMETER	SYMBOL	RATINGS	UNITS
VIN Pin Voltage	VIN	VSS – 0.3 ~ 7.0	V
Lx Pin Voltage	VLx	VSS – 0.3 ~ 22.0	V
FB Pin Voltage	VFB	VSS – 0.3 ~ 7.0	V
CE Pin Voltage	VCE	VSS – 0.3 ~ 7.0	V
Lx Pin Current	ILx	1000	mA
Power Dissipation	Pd	250	mW
Operating Ambient Temperature	Topr	- 40 ~ + 85	℃
Storage Temperature	Tstg	- 55 ~ +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
JTMT6367	PWM/PFM	0.9	10	1.5	6.5	1000	100kHz	None	SOT-25
JTMT6368							180kHz
							300kHz
							500kHz
JTMT6371	PWM/PFM	0.9	10	2	7	100	50kHz	Nch FET	SOT-89
JTMT6372							100kHz		SOT-89-5
							180kHz		USP-6B
JTMT9101	PWM	2.5	20	2.2	30	1500	100~600kHz	None	MSOP-8A
JTMT9103	PWM/PFM	0.9	10	1.5	30	1000	100kHz	None	SOT-25
JTMT9104							180kHz		USP-6B
JTMT9105							300kHz
							500kHz
JTMT9106	PWM/PFM	0.9	10	1.5	30	1000	100kHz	None	SOT-25
JTMT9107							300kHz		USP-6B
JTMT9110	PFM	0.9	10	1.5	7	100	100kHz	Nch FET	SOT-23
JTMT9111									SOT-25
									SOT-89
									USP-6C
JTMT9116	Backlight LED Driver	2.5	6	8	18	20	1MHz	Nch FET	SOT-25
									USP-6B
JTMT9119	PWM	2.5	6	10	18	100	1MHz	Nch FET	SOT-25
									USP-6C
JTMT9120	PWM/PFM	0.9	6	1.5	30	80	100kHz	None	SOT-25
JTMT9121									USP-6C
JTMT9122
JTMT9128	1A Driver Transistor Built-In	0.8	6	1.8	5.3	500	1.2MHz	Nch FET	MSOP-10
JTMT9129								Pch FET	USP-10B
JTMT9131	Load Disconnection Function	0.65	5.5	1.8	5	500	1.2MHz	Nch FET	USP-10B
								Pch FET
JTMT9133	LED Backlight	2.5	6	2.5	17.5	20	1MHz	MOSFET	SOT-25
JTMT9135	1A Driver Transistor Built-In	0.65	5.5	1.8	5	500	1.2MHz	Nch FET	USP-10B
JTMT9136								Pch FET
JTMT9140	Synchronous PFM	0.9	5.5	1.8	5	100	-	N-ch Driver Tr	SOT-25
								P-ch Synchronous Switch Transistor	USP-6EL
JTMT9141	Load Disconnection Function	0.65	6	1.8	5.5	350	1.2MHz	Nch FET	SOT-25
JTMT9142							3.0MHz	Pch FET	USP-6C
									WLP-6-01

(责任编辑：oumao18)