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参数资料
| 型号： | MAX5090CATE/V+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/17页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 2A 16WQFN |
| 产品变化通告： | Product Discontinuation 28/Nov/2011 |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.27 V ~ 11 V |
| 输入电压： | 6.5 V ~ 76 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 127kHz |
| 电流 - 输出： | 2A |
| 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-WQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-TQFN-EP（5x5） |
2A, 76V, High-Efficiency MAXPower Step-Down
DC-DC Converters
? I OUT +
? ? I L ?
?
2 ?
ESR IN =
? V ESR
?
800
700
C IN = OUT
I × D ( 1 ? D )
? V Q × f SW
600
500
D = OUT
where:
? I L =
(V IN ? V OUT ) × V OUT
V IN × f SW × L
V
V IN
400
300
200
100
I OUT is the maximum output current of the converter
and f SW is the oscillator switching frequency (127kHz).
For example, at V IN = 48V, V OUT = 3.3V, the ESR and
0
-40
25
100
TEMPERATURE ( ° C)
125
150
input capacitance are calculated for the input peak-to-
peak ripple of 100mV or less, yielding an ESR and
capacitance value of 40m ? and 100μF, respectively.
Low-ESR ceramic multilayer chip capacitors are recom-
mended for size-optimized application. For ceramic
capacitors assume the contribution from ESR and capaci-
tor discharge is equal to 10% and 90%, respectively.
The input capacitor must handle the RMS ripple current
without significant rise in the temperature. The maxi-
mum capacitor RMS current occurs at approximately
50% duty cycle. Ensure that the ripple specification of
the input capacitor exceeds the worst-case capacitor
RMS ripple current. Use the following equations to cal-
culate the input capacitor RMS current:
I CRMS = I PRMS 2 ? I AVGin 2
Figure 3. Forward-Voltage Drop vs. Temperature of the Internal
Body Diode of MAX5090
Output Filter Capacitor
The output capacitor C OUT forms double pole with the
inductor and a zero with its ESR. The MAX5090’s inter-
nal fixed compensation is designed for a 100μF capaci-
tor, and the ESR must be from 20m ? to 100m ? . The
use of an aluminum or tantalum electrolytic capacitor is
recommended. See Table 2 to choose an output
capacitor for stable operation.
The output ripple is comprised of ? V OQ (caused by the
capacitor discharge), and ? V OESR (caused by the ESR
of the capacitor). Use low-ESR tantalum or aluminum
electrolytic capacitors at the output. Use the following
equations to calculate the contribution of output capac-
I AVGin =
? I L
I PK = I OUT +
? V OQ ≈
where:
I PRMS = ( I PK 2 + I DC 2 + IPK xIDC ) x
V OUT x I OUT
V IN x η
2
? I L
I DC = I OUT ?
2
V OUT
D =
V IN
D
3
itance and its ESR on the peak-to-peak output ripple
voltage:
? V OESR = ? I L x ESR
? I L
8 xC OUT x f SW
The MAX5090 has a programmable soft-start time (t SS ).
The output rise time is directly proportional to the out-
put capacitor, output voltage, and the load. The output
rise time also depends on the inductor value and the
current-limit threshold. It is important to keep the output
I PRMS is the input switch RMS current, I AVGin is the
input average current, and η is the converter efficiency.
The ESR of the aluminum electrolytic capacitor increas-
es significantly at cold temperatures. Use a 1μF or
greater value ceramic capacitor in parallel with the alu-
minum electrolytic input capacitor, especially for input
voltages below 8V.
rise time at startup the same as the soft-start time (t SS )
to avoid output overshoot. Large output capacitors take
longer than the programmed soft-start time (t SS ) and
cause error-amplifier saturation. This results in output
overshoot. Use greater than 2ms soft-start time for a
100μF output capacitor.
12
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