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参数资料
| 型号： | MAX1838EEE |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | Dual USB Switch with Fault Blanking and Autoreset |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封装： | 0.150 INCH, 0.025 INCH PTICH, QSOP-16 |
| 文件页数： | 11/12页 |
| 文件大小： | 639K |
| 代理商： | MAX1838EEE |
during a load step. The MAX1838 is capable of driving
inductive loads, but avoid exceeding the device
’
s
absolute maximum ratings. Usually the load inductance
is relatively small, and the MAX1838
’
s input includes a
substantial bulk capacitance from an upstream regulator
as well as local bypass capacitors, limiting overshoot. If
severe ringing occurs due to large load inductance,
clamp the MAX1838
’
s output below 6V and above -0.3V.
Turn-On and Turn-Off Behavior
In absence of faults, the MAX1838
’
s internal switches
turn on and off slowly under the control of the
ON
input.
The slow charge-pump switch-drive minimizes load tran-
sients on the upstream power source. Under thermal
fault and undervoltage lockout, the power device turns
off rapidly to protect the switch and the power source.
Layout and Thermal Dissipation
To optimize the switch response to output short-circuit
conditions, keep all traces as short as possible to reduce
the effect of undesirable parasitic inductance. Place
input and output capacitors no more than 5mm from
device leads. IN, AUX, and OUT pins must be connect-
ed with short traces to the power bus. Wide power bus
planes provide superior switch heat dissipation. While
the switches are on, power dissipation is small and the
package temperature rise is minimal. Calculate the
power dissipation for this condition as follows:
P = (I
OUT
)
2
R
ON
For the normal operating current (I
OUT
= 0.5A), the max-
imum on-resistance of the switch is 170m
, and the
power dissipation is:
P = (0.5A)
2
x 0.170
= 43mW per switch
The worst-case power dissipation occurs when the
switch is in current limit and the output is greater than
1V. In this case, the power dissipated in each switch is
the voltage drop across the switch multiplied by the cur-
rent limit:
P = (I
LIM
) (V
IN
- V
OUT
)
For a 5V input and 1V output, the maximum power dissi-
pation per switch is:
P = (1.2A) (5.5V - 1V) = 5.4W
Since the package power dissipation is only 667mW, the
MAX1838 die temperature will exceed the thermal shut-
down threshold and the switch output shuts down until
the junction temperature cools by 10
°
C. The duty cycle
and period are strong functions of the ambient tempera-
ture and the PC board layout.
A short circuit at the output causes the power dissipated
across the switch and the junction temperature to
increase. If the fault condition persists, the thermal-over-
load-protection circuitry activates, and the output shuts
down until the junction temperature decreases by 10
°
C
(see
Thermal Shutdown
).
Chip Information
TRANSISTOR COUNT: 3227
PROCESS: BiCMOS
M
Dual USB Switch with Fault Blanking
and Autoreset
______________________________________________________________________________________
11
Figure 2. Typical Application Circuit
FAULTB
FAULTA
OUTB2
OUTB1
OUTA2
OUTA1
ADJB
ADJA
AUXA
AUXB
INA
INB
SEL
ON
GND
AUX
IN
OUTB
OUTA
0.1
μ
F
0.1
μ
F
10
μ
F
67k
100k
MAX1838
100k
10
μ
F
67k
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1838EEE+ | 功能描述:电源开关 IC - USB Dual USB Switch w/Fault Blank RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| MAX1838EEE+T | 功能描述:电源开关 IC - USB Dual USB Switch w/Fault Blank RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| MAX1838EEE-T | 功能描述:电源开关 IC - USB Dual USB Switch w/Fault Blank RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| MAX1839EEP | 功能描述:显示驱动器和控制器 RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
| MAX1839EEP+ | 功能描述:显示驱动器和控制器 CCFL Backlight Controller RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
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