参数资料
型号: FT440BA
厂商: Fremont Micro Devices USA
文件页数: 9/10页
文件大小: 0K
描述: IC REG BUCK SYNC 1.5V 0.6A SOT23
标准包装: 1
类型: 降压(降压)
输出类型: 固定
输出数: 1
输出电压: 1.5V
输入电压: 2.5 V ~ 5.5 V
PWM 型: 电流模式
频率 - 开关: 1.5MHz
电流 - 输出: 600mA
同步整流器:
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: SC-74A,SOT-753
包装: 标准包装
供应商设备封装: SOT-23-5
其它名称: 1219-1076-6
Fremont Micro Devices
APPLICATION INFORMATION
Figure5 below shows the typical application circuit with FT4402 fixed output versions.
FT440
VIN 2.7~4.2V
4
V IN
SW
3
L1 2.2uH
Vout 1.8V
FT440
C1
4.7uF
1
EN
V out
5
C2
10uF
GND
2
Figure 5: Typical Application Circuit with fixed output versions
Inductor Selection
Under normal operation, the inductor maintains continuous current to the output. Its value is chosen based on the
desired ripple current. Large value inductors lower ripple current, and small value inductors result in higher
ripple currents. The inductor value can be derived from the following equation:
L ?
V out ? ( V IN ? V out )
V IN ? ? I L ? f osc
, Where ⊿ I L is inductor ripple current.
Input Capacitor Selection
The input capacitor reduces input voltage ripple to the converter; a 4.7uF ceramic capacitor is recommended for
most applications.
Output Capacitor Selection
The output capacitor is required to keep the output voltage ripple small and to ensure regulation loop stability.
The output capacitor must have low impedance at the switching frequency. The output ripple ⊿ Vout
approximately:
? V OUT ? ? I L ? ( ESR ?
1
8 fC OUT
)
Output Voltage Programming
Figure1 above shows the typical application with FT4402 adjustable version. The external resistor sets the output
voltage according to following equation:
V OUT ? 0 . 6 V ? ( 1 ?
R 2
R 1
)
www.fremontmicro.com
Page 9 of 10
DS440-A3
相关PDF资料
PDF描述
VE-25N-EX-F4 CONVERTER MOD DC/DC 18.5V 75W
VE-25N-EX-F2 CONVERTER MOD DC/DC 18.5V 75W
VE-25N-EX-F1 CONVERTER MOD DC/DC 18.5V 75W
VE-253-EX-F4 CONVERTER MOD DC/DC 24V 75W
VE-253-EX-F3 CONVERTER MOD DC/DC 24V 75W
相关代理商/技术参数
参数描述
FT440CA 功能描述:IC REG BUCK SYNC 1.8V 0.6A SOT23 RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 类型:降压(降压) 输出类型:两者兼有 输出数:1 输出电压:5V,1 V ~ 10 V 输入电压:3.5 V ~ 28 V PWM 型:电流模式 频率 - 开关:220kHz ~ 1MHz 电流 - 输出:600mA 同步整流器:无 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:16-SSOP(0.154",3.90mm 宽) 包装:带卷 (TR) 供应商设备封装:16-QSOP
FT441AA 功能描述:IC REG BUCK SYNC ADJ 0.9 A SOT23 RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 类型:降压(降压) 输出类型:两者兼有 输出数:1 输出电压:5V,1 V ~ 10 V 输入电压:3.5 V ~ 28 V PWM 型:电流模式 频率 - 开关:220kHz ~ 1MHz 电流 - 输出:600mA 同步整流器:无 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:16-SSOP(0.154",3.90mm 宽) 包装:带卷 (TR) 供应商设备封装:16-QSOP
FT4448 制造商:OHIO BUCKEYE 功能描述:
FT450 制造商:Black Box Corporation 功能描述:CLEAR LABEL HOLDERS, 6PK
FT451 制造商:Black Box Corporation 功能描述:MARKED COLOR LABELS, 6PK WHITE