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參數(shù)資料
| 型號(hào)： | NCN6004AFTBR2G |
| 廠商： | ON Semiconductor |
| 文件頁數(shù)： | 17/40頁 |
| 文件大小： | 0K |
| 描述： | IC INTERFACE SAM/SIM DUAL 48TQFP |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 應(yīng)用： | PC，PDA |
| 接口： | 微控制器 |
| 電源電壓： | 1.8 V ~ 5.5 V |
| 封裝/外殼： | 48-TQFP 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 48-TQFP（7x7） |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 安裝類型： | 表面貼裝 |
| 其它名稱： | NCN6004AFTBR2GOSDKR |
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NCN6004A
http://onsemi.com
24
Since the output inductor L1 and the reservoir capacitor
C1 carry relative high peak current, low ESR devices must
be used to prevent the system from poor output voltage
ripple and low efficiency. Using ceramic capacitors, X5R or
X7R type, are recommended, splitting the 10
mF in two
separate parts when there is a relative long distance between
the CRD_VCC_x output pin and the card VCC input. On the
other hand, the inductor shall have an ESR below 1.0
W to
achieve the high efficiency over the full temperature range.
However, inductor with 2.0
W ESR can be used when a slight
decrease of the efficiency is acceptable at system level.
Ton Toff
CRD_VCC Charged
Charge CRD_VCC
Next CRD_VCC Charge
Q1 / Q4
Q2 / Q3
IL
(Time is not to scale)
CRD_VCC
CRD_VCC Voltage Regulated
Ipeak
V
ripple
Q5/Q6
Figure 16. Theoretical DC/DC Operating
When the CRD_VCC is programmed to zero volt, or when
the card is extracted from the socket, the active pull down Q5
rapidly discharges the output reservoir capacitor, making
sure the output voltage is below 0.40 V when the card slides
across the contacts.
Based on the experiments carried out during the
NCN6004A characterization, the best comprise, at time of
printing
this
document,
is
to
use
two
4.7
mF/10 V/ceramic/X7R capacitor in parallel to achieve
the CRD_VCC filtering. The ESR will not extend 50 m
W
over the temperature range and the combination of standard
parts provide an acceptable –20% to +20% tolerance,
together with a low cost. Table 6 shows a quick comparison
between the most common type of capacitors. Obviously,
the capacitor must be SMD type to achieve the extremely
low ESR and ESL necessary for this application.
Figure 17 illustrates the CRD_VCC ripple observed in the
NCN6004A demo board running with X7R ceramic
capacitors.
Table 6. Ceramic/Electrolytic Capacitors Comparison
Manufacturer
Type/Series
Format
Max Value
Tolerance
Typ. Z @ 500 kHz
MURATA
CERAMIC/GRM225
0805
10
mF/6.3 V
20% /+20%
30 m
W
MURATA
CERAMIC/GRM225
0805
4.7
mF/6.3 V
20% /+20%
30 m
W
VISHAY
Tantalum/594C/593C
1206
10
mF/16 V
450 m
W
VISHAY
Electrolytic/94SV
1812
10
mF/10 V
20%/+20%
400 m
W
Miscellaneous
Electrolytic Low Cost
1812
10
mF/10 V
35%/+50%
2.0
W
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| NCN6010DTB | 功能描述:轉(zhuǎn)換 - 電壓電平 2.7V Sim Card RoHS:否 制造商:Micrel 類型:CML/LVDS/LVPECL to LVCMOS/LVTTL 傳播延遲時(shí)間:1.9 ns 電源電流:14 mA 電源電壓-最大:3.6 V 電源電壓-最小:3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MLF-8 |
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