参数资料
型号: TPS62238DRYR
厂商: Texas Instruments
文件页数: 23/35页
文件大小: 0K
描述: IC REG BUCK SYNC 2.25V 0.5A 6SON
标准包装: 5,000
类型: 降压(降压)
输出类型: 固定
输出数: 1
输出电压: 2.25V
输入电压: 2.05 V ~ 6 V
PWM 型: 电压模式
频率 - 开关: 3MHz
电流 - 输出: 500mA
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: 6-UFDFN
包装: 带卷 (TR)
供应商设备封装: 6-SON(1.45x1)

TPS62230, TPS62231, TPS62232, TPS62233, TPS62234, TPS62235, TPS62236
TPS62237, TPS62238, TPS62239, TPS622310, TPS622311, TPS622312
TPS622313, TPS622314, TPS622315, TPS622316, TPS622317, TPS622318
APPLICATION INFORMATION
SLVS941E – APRIL 2009 – REVISED DECEMBER 2010
V IN
2.7 V - 6 V
VIN
TPS62230
SW
L
1/2.2 m H
V OUT
2.5 V
C IN
2.2 m F
EN
MODE
FB
GND
C OUT
4.7 m F
Figure 52. TPS62230 2.5V Output
V IN
2.05 V - 6 V
VIN
TPS62231
SW
L
1/2.2 m H
V OUT
1.8 V
C IN
2.2 m F
EN
MODE
FB
GND
C OUT
4.7 m F
Figure 53. TPS62231 1.8V Output
V IN
2.05 V - 6 V
VIN
TPS62232
SW
L
1/2.2 m H
V OUT
1.2 V
C IN
2.2 m F
EN
MODE
FB
GND
C OUT
4.7 m F
Figure 54. TPS62232 1.2V Output
OUTPUT FILTER DESIGN (INDUCTOR AND OUTPUT CAPACITOR)
The TPS6223X is optimized to operate with effective inductance values in the range of 0.7 μ H to 4.3 μ H and with
effective output capacitance in the range of 2.0 μ F to 15 μ F. The internal compensation is optimized to operate
with an output filter of L = 1.0 μ H/2.2 μ H and C OUT = 4.7 μ F. Larger or smaller inductor/capacitor values can be
used to optimize the performance of the device for specific operation conditions. For more details, see the
CHECKING LOOP STABILITY section.
INDUCTOR SELECTION
The inductor value affects its peak-to-peak ripple current, the PWM-to-PFM transition point, the output voltage
ripple and the efficiency. The selected inductor has to be rated for its dc resistance and saturation current. The
inductor ripple current ( Δ I L ) decreases with higher inductance and increases with higher V I N or V O UT . Equation 5
calculates the maximum inductor current under static load conditions. The saturation current of the inductor
should be rated higher than the maximum inductor current as calculated with Equation 6 . This is recommended
because during heavy load transient the inductor current will rise above the calculated value.
D I L = Vout ′
Vout
1 -
Vin
L ′ |
(5)
I Lmax = I outmax +
D I L
2
(6)
With:
f = Switching Frequency
L = Inductor Value
Δ I L = Peak to Peak inductor ripple current
I Lmax = Maximum Inductor current
Copyright ? 2009–2010, Texas Instruments Incorporated
23
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