参数资料
| 型号： | SC196ULTRT |
| 厂商： | Semtech |
| 文件页数： | 9/18页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 1.5A 10MLPD |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 5.5 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 1.5A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-UFDFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 10-MLPD-UT（3x3） |
| 产品目录页面： | 1357 (CN2011-ZH PDF) |
| 其它名称： | SC196ULDKR |
SC196
POWER MANAGEMENT
Applications Information (Cont.)
the PMOS is switched on continuously, the output voltage
tracks the input voltage minus the voltage drop across
PRELIMINARY
Table 1 — Recommended Inductors
the PMOS power device and inductor according to the
following relationship:
V OUT = V IN - I OUT x (R DSP + R IND )
where
V OUT = Output voltage
V IN = Input voltage
I OUT = Output current
R DSP = PMOS switch ON resistance
R IND = Series resistance of the inductor
Manufacturer/Part #
BI Technologies
HM66404R1
Coilcraft
D01608C-472ML
TDK
VLCF4020T- 4R7N1R2
Taiyo Yuden
LMNP04SB4R7N
TOKO
D52LC
Value
( μ H)
4.1
4.7
4.7
4.7
4.7
DCR
( Ω )
0.057
0.09
0.098
0.050
0.087
Rated
Current
(A)
1.95
1.5
1.24
1.2
1.14
Tolerance
(%)
20
20
30
30
20
Dimensions
LxWxH
(mm)
5.7 × 5.7 ×2.0
6.6 × 4.5 × 3.0
4.0 × 4.0 × 2.0
5.0 × 5.0 × 2.0
5.0 × 5.0 × 2.0
4.7
0.050
1.2
30
3.8 × 3.8 × 1.8
4.7
0.2
1.1
20
3.0 × 3.0 × 1.5
InductorSelection
The SC196 is designed for use with a 4.7 μ H inductor. Where
V OUT > 3.8V is required, a 10 μ H inductor is recommended.
The magnitude of the inductor current ripple depends on
the inductor value and can be determined by the following
equation:
Sumida
CDRH3D16
Coilcraft
LPS3015
Note: recommended Inductors do not necessarily guarantee rated perfor-
mance of the part.
I L
V OUT
L f osc
1
V OUT
V IN
C OUT Selection
The internal compensation is designed to work with a
certain output ? lter corner frequency de ? ned by the
This equation demonstrates the relationship between
equation:
input voltage, output voltage, and inductor ripple current.
The inductor should have a low DCR to minimize the
f C
2
1
L C OUT
I L
I L(PK) I O UT(MAX)
conductionlossesandmaximizeef?ciency. Asaminimum
requirement, the DC current rating of the inductor
should be equal to the maximum load current plus half
of the inductor current ripple as shown by the following
equation:
2
Final inductor selection will depend on various design con-
siderations such as ef ? ciency, EMI, size and cost. Table 2
lists the manufacturers of practical inductor options.
C IN Selection
The source input current to a buck converter is non-
continuous. To prevent large input voltage ripple, a low
ESR ceramic capacitor is required. A minimum value of
10 μ F should be used for input voltage ? ltering, while a
22 μ F capacitor is recommended for improved input
voltage ? ltering.
This ? lter has a single pole and is designed to operate with
a minimum output capacitor value of 10 μ F. Larger output
capacitor values will improve transient performance.
If PSAVE operation is required, the minimum capacitor
value is 22 μ F.
Output voltage ripple is a combination of the voltage
ripple from the inductor current charging and discharging
the output capacitor and the voltage created from the
inductor current ripple through the output capacitor ESR.
Selecting an output capacitor with a low ESR will reduce
the output voltage ripple component, as can be seen in
the following equation:
Δ V OUT(ESR) = Δ I L(RIPPLE) x ESR COUNT
Capacitors with X7R or X5R ceramic dielectric are strongly
recommended for their low ESR and superior temperature
? 2007 Semtech Corp.
9
www.semtech.com
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