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参数资料
| 型号： | MAX1921EUT33+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/11页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 3.3V SOT23-6 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 3.3V |
| 输入电压： | 2 V ~ 5.5 V |
| 频率 - 开关： | 1.2MHz |
| 电流 - 输出： | 400mA |
| 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： | SOT-23-6 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | SOT-6 |
Low-Voltage, 400mA Step-Down
DC-DC Converters in SOT23
V OUT ( V IN ? V OUT )
dielectric. The input capacitor filters peak currents and
noise at the voltage source and, therefore, must meet
the input ripple requirements and voltage rating.
Calculate the maximum RMS input current as:
I IN ( RMS ) = I OUT ( MAX ) ×
V IN
The output capacitor, C OUT , may be either ceramic or
tantalum depending upon the chosen application cir-
cuit (see Figures 1 through 4). Table 3 lists some sug-
gested capacitor suppliers.
Ceramic Output Capacitor
For ceramic C OUT , use the application circuit of Figure 1
or Figure 2. Calculate the minimum capacitor value as:
Tantalum Output Capacitor
For tantalum C OUT , use the application circuit of Figure
3 or Figure 4. With tantalum C OUT , the equivalent series
resistance (ESR) of C OUT must be large enough for sta-
bility. Generally, 25mV of ESR-ripple at the feedback
node is sufficient. The simplified calculation is:
ESR COUT ( MIN ) = 8 . 0 × 10 ? 2 × V OUT
Because tantalum capacitors rarely specify minimum
ESR, choose a capacitor with typical ESR that is about
twice as much as ESR COUT (MIN). Although ESRs
greater than this work, output ripple becomes larger.
For tantalum C OUT , calculate the minimum output
capacitance as:
C OUT ( MIN ) = 2 . 5 × 10 ? 6 × V CRITICAL
Select the next standard value larger than C OUT (MIN).
C OUT ( MIN ) = 1 . 25 ×
L × I OUT ( MAX )
ESR COUT ( MIN ) × V CRITICAL
The C OUT (MIN) calculation already includes a margin
for capacitor tolerance. Values much larger than
C OUT (MIN) always improve transient performance and
stability, but capacitor size and cost increase.
The 1.25 multiplier is for capacitor tolerance. Select any
standard value larger than C OUT (MIN).
Feedback and Compensation
The MAX1921 has factory preset output voltages of
1.5V, 1.8V, 2.5V, 3V, and 3.3V, while the MAX1920 is
externally adjusted by connecting FB to a resistive volt-
age-divider. When using a ceramic output capacitor,
the feedback network must include a compensation
feed-forward capacitor, C FF .
INPUT
2V TO 5.5V
1
IN
LX
6
L
OUTPUT
UP TO 400mA
INPUT
2V TO 5.5V
1
IN
LX
6
L
OUTPUT
UP TO 400mA
C IN
R1
C OUT
C IN
C OUT
2
MAX1920
AGND PGND
5
C FF
2
MAX1921
AGND PGND
5
ON
3
SHDN
FB
4
ON
3
SHDN
OUT
4
OFF
R2
OFF
Figure 2. Typical Application Circuit (MAX1920)
Figure 3. MAX1921 Application Circuit Using Tantalum Output
Capacitor
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