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參數(shù)資料
| 型號： | LTC4558EUD#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC20 |
| 封裝： | 3 X 3 MM, 0.75 MM HEIGHT, PLASTIC, QFN-20 |
| 文件頁數(shù)： | 2/12頁 |
| 文件大?。?/td> | 146K |
| 代理商： | LTC4558EUD#TR |
LTC4558
10
4558fa
10kV ESD Protection
All Smart Card pins (CLKA,B, RSTA,B, I/OA,B, VCCA,B and
GND) can withstand over 10kV of human body model ESD
in-situ. In order to ensure proper ESD protection, careful
board layout is required. The GND pin should be tied di-
rectly to a ground plane. The VCCA,B capacitors should be
located very close to the VCCA,B pins and tied immediately
to the ground plane.
Capacitor Selection
A total of four capacitors is required to operate the LTC4558.
An input bypass capacitor is required at VBATT and DVCC.
Output bypass capacitors are required on each of the
Smart Card VCC pins.
There are several types of ceramic capacitors available,
each having considerably different characteristics. For
example, X7R ceramic capacitors have excellent voltage
and temperature stability but relatively low packing density.
Y5V and X5R ceramic capacitors have apparently higher
APPLICATIONS INFORMATION
Figure 2. Additional Components for Improved Compliance Testing
packing density but poor performance over their rated
voltage or temperature ranges. Under certain voltage
and temperature conditions Y5V, X5R and X7R ceramic
capacitors can be compared directly by case size rather
than specied value for a desired minimum capacitance.
The VCCA,B outputs should be bypassed to GND with a 1μF
capacitor. A low ESR ceramic capacitor is recommended
on each VCC pin to ensure ESD compliance.
VBATT and DVCC should be bypassed with 0.1μF ceramic
capacitors.
Compliance Testing
Inductance due to long leads on type approval equipment
can cause ringing and overshoot that leads to testing prob-
lems. Small amounts of capacitance and damping resistors
can be included in the application without compromising
the normal electrical performance of the LTC4558 or Smart
Card system. Generally a 100Ω resistor and a 20pF capaci-
tor will accomplish this, as shown in Figure 2.
100
Ω
100
Ω
100
Ω
20pF
1
μF
4558 F02
VCCA,B
CLKA,B
LTC4558
RSTA,B
I/OA,B
SMART
CARD
SOCKET
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