- 您现在的位置：买卖IC网 > PDF目录13767 > FAN5362UC29X (Fairchild Semiconductor)IC REG BUCK SYNC 2.9V .5A 6WLCSP PDF资料下载
参数资料
| 型号： | FAN5362UC29X |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 10/14页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 2.9V .5A 6WLCSP |
| 标准包装： | 3,000 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 2.9V |
| 输入电压： | 2.7 V ~ 5.5 V |
| 频率 - 开关： | 3MHz |
| 电流 - 输出： | 500mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-UFBGA，WLCSP |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 6-WLCSP |
V OUT
I OUT ( DC ) 2 ?
? I 2
? 1 ? t OFF ( MIN ) ? f SW ? 0 . 7 .
Thermal Shutdown
When the die temperature increases, due to a high load
condition and/or a high ambient temperature, the output
switching is disabled until the temperature on the die has
fallen sufficiently. The junction temperature at which the
thermal shutdown activates is nominally 150°C with a 20°C
hysteresis.
Minimum Off-Time Effect on Switching
Frequency
t OFF(MIN) is 35ns. This imposes constraints on the maximum
that the FAN5362 can provide, or the maximum
V IN
output voltage it can provide at low V OUT while maintaining a
fixed switching frequency in PWM mode.
When V IN is high, fixed switching is maintained as long as
V OUT
V IN
The switching frequency drops when the regulator cannot
provide sufficient duty cycle at 3MHz to maintain regulation.
This occurs when V IN is below 3.3V at nominal load currents.
The calculation for switching frequency is given by:
The FAN5362 is optimized for operation with L=1 ? H, but is
stable with inductances up to 1.5 ? H (nominal) and down to
470nH. The inductor should be rated to maintain at least
80% of its value at I LIM(PK) . Failure to do so lowers the
amount of DC current that the IC can deliver.
Efficiency is affected by the inductor DCR and inductance
value. Decreasing the inductor value for a given physical size
typically decreases the DCR; but since ? I increases, the RMS
current increases, as do the core and skin effect losses.
I RMS ? (8)
12
The increased RMS current produces higher losses through
the R DS(ON) of the IC MOSFETs as well as the inductor ESR.
Increasing the inductor value produces lower RMS currents,
but degrades transient response. For a given physical
inductor size, increased inductance usually results in an
inductor with lower saturation current and higher DCR.
Inductor Current Rating
The FAN5362’s current limit circuit can allow a peak current
of 1.25A to flow through L1 under worst-case conditions. If it
is possible for the load to draw that much continuous current,
the inductor should be capable of sustaining that current or
?
f SW ? min ?
, 3 MHz ?
?
where:
1
?
? t SW ( MAX )
?
?
(4)
failing in a safe manner.
Output Capacitor
While 4.7 ? F capacitors are available in 0402 package size,
t SW ( MAX ) ? 35 ns ? ? ? 1 ?
?
?
?
?
V OUT ? I OUT ? R OFF
V IN ? I OUT ? R ON ? V OUT
?
?
(5)
0603 capacitors are recommended due to the severe DC
voltage bias degradation in capacitance value that the
0402 exhibits.
where:
R OFF = R DSON _ N ? DCR L
Increasing C OUT has no effect on loop stability and can
therefore be increased to reduce output voltage ripple or to
improve transient response. Output voltage ripple, ? V OUT , is:
? V OUT ? ? I ? ? ?
? ESR ? ?
R ON = R DSON _ P ? DCR L
?
?
1
8 ? C OUT ? f SW
?
?
(9)
? ? ? IN
V OUT ? V ? V OUT ?
?
Applications Information
Selecting the Inductor
The output inductor must meet both the required inductance
and the energy handling capability of the application.
The inductor value affects the average current limit, the
PWM-to-PFM transition point, the output voltage ripple, and
the efficiency.
The ripple current ( ? I) of the regulator is:
? I ? ? (6)
V IN ? L ? f SW ?
The maximum average load current, I MAX(LOAD) is related to
the peak current limit, I LIM(PK) by the ripple current:
If values greater than 24 ? F of C OUT are used, the regulator
may fail to start. See the sections on Enable and Soft Start
for more information.
Input Capacitor
The 2.2 ? F ceramic input capacitor should be placed as close
as possible to the VIN pin and GND to minimize the parasitic
inductance. If a long wire is used to bring power to the IC,
additional “bulk” capacitance (electrolytic or tantalum) should
be placed between C IN and the power source lead to reduce
ringing that can occur between the inductance of the power
source leads and C IN .
I MAX ( LOAD ) ? I LIM ( PK ) ?
? I
2
(7)
? 2009 Fairchild Semiconductor Corporation
FAN5362 ? Rev. 1.0.5
10
www.fairchildsemi.com
相关PDF资料 |
PDF描述 |
|---|---|
| FAN4860UC5X | IC REG BOOST SYNC 5V 0.2A 6WLCSP |
| GCC17DREI-S93 | CONN EDGECARD 34POS .100 EYELET |
| RCC18DRTN-S734 | CONN EDGECARD 36POS DIP .100 SLD |
| RCC18DRTH-S734 | CONN EDGECARD 36POS DIP .100 SLD |
| LMR10510YMFX/NOPB | IC REG BUCK ADJ 1A SOT23-5 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| FAN5362UC33X | 功能描述:直流/直流开关调节器 3MHz, 500mA/750mA Sync Buck Regulator RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| FAN5362UMP29X | 功能描述:直流/直流开关调节器 3MHz, 500mA/750mA Sync Buck Regulator RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| FAN5362UMP33X | 功能描述:直流/直流开关调节器 3MHz, 500mA/750mA Sync Buck Regulator RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| FAN5365 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:1A / 0.8A, 6MHz Digitally Programmable Regulator |
| FAN5365UC00X | 功能描述:直流/直流开关转换器 0.8A 6MHz Digitally Programmable Reg. RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
发布紧急采购，3分钟左右您将得到回复。