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参数资料
| 型号： | MAX5087BATE/V+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 5V/ADJ .4A 16-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 稳压器拓扑结构： | 正，固定式或可调式 |
| 输出电压： | 5V，2.5 V ~ 11 V |
| 输入电压： | 6.5 V ~ 45 V |
| 电压 - 压降（标准）： | 0.9V @ 400mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 400mA（最小） |
| 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 |
| 供应商设备封装： | 16-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
MAX5087
45V, 400mA, Low-Quiescent-Current
Linear Regulator with Adjustable Reset Delay
Applications Information
Output-Voltage Selection
The MAX5087 features a Dual Mode TM operation, in
either a preset-voltage mode or an adjustable mode. In
preset-voltage mode, internal feedback resistors set
4.0
3.5
3.0
the MAX5087’s output voltage to +3.3V or +5V. Select
preset-voltage mode by connecting SET to ground. In
adjustable mode, select an output between +2.5V and
+11V using two external resistors connected as a volt-
age-divider to SET (Figure 2). Set the output voltage
using the following equation:
2.5
2.0
1.5
1.0
0.5
2.666W
(16-PIN TQFN)
DERATE
33.3mW/ ° C
V OUT = V SET x ? 1 +
?
?
?
R 1 ?
R 2 ?
0
0
20
40
60 80 100 120 140
TEMPERATURE ( ° C)
where V SET = 1.235V and R2 is chosen to be < 100k Ω .
? 2 . 666 W for T A ≤ + 70 ° C ?
P D = ?
?
? 2 . 666 W ? 0 . 0333 ° C x ( T A ? 70 ° C ) for + 70 ° C < T A ≤ + 125 ° C ?
P D = 2.666W ? 0.0333
(95 ° C ? 70 ° C) = 1.8335W
Available Output-Current Calculation
The MAX5087 high-voltage regulator provides up to
400mA of output current. The input voltage extends to
+45V. Package power dissipation limits the amount of
output current available for a given input/output voltage
and ambient temperature. Figure 3 shows the maxi-
mum power dissipation curve for these devices. The
graph assumes that the exposed paddle of the MAX5087
package is set up per JEDEC 51 (multilayer board)
specifications.
Use Figure 3 to determine the allowable package dissi-
pation (P D ) for a given ambient temperature.
Alternately, use the following formulas to calculate the
allowable package dissipation. Note that for the exam-
ples shown below, the electrical characteristic limits are
guaranteed up to T J = +125°C (max).
? ?
W
? ?
Figure 3. Calculated Maximum Power Dissipation vs.
Temperature
The above equations do not include the negligible
power dissipation from self-heating due to the IC
ground current.
Example 1:
T A = +95°C
V IN = +14V
V OUT = +5V
Find the maximum allowable output current. First calcu-
late package dissipation at the given temperature as
follows:
W
° C
Then determine the maximum output current:
After determining the allowable package dissipation
calculate the maximum output current using the follow-
ing formula:
I OUT(MAX) =
Example 2:
T A = +125°C
(1.8335W)
(14V) ? (5V)
= 203mA
I OUT(MAX) ?
P D
V IN ? V OUT
≤ 4 0 0mA
V IN = +14V
V OUT = +5V
Dual Mode is a trademark of Maxim Integrated Products, Inc.
Maxim Integrated
9
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