参数资料
| 型号： | EL7581IREZ |
| 厂商： | Intersil |
| 文件页数： | 12/17页 |
| 文件大小： | 0K |
| 描述： | IC CONV DC/DC 3-CHAN 20-HTSSOP |
| 标准包装： | 74 |
| 应用： | 转换器，TFT，LCD |
| 输入电压： | 2.7 V ~ 14 V |
| 输出数： | 2 |
| 输出电压： | 5 V ~ 17 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽）裸露焊盘 |
| 供应商设备封装： | 20-TSSOP-EP |
| 包装： | 管件 |
EL7581
I LPK = I LAVG + -------- L
I LAVG = -------------
V RIPPLE = I LPK × ESR + -------------------------------- × ------------------------------
V C × FS
Component Considerations
Input Capacitor
It is recommended that C IN is larger than 10μF.
Theoretically, the input capacitor has ripple current of ? I L .
Due to high-frequency noise in the circuit, the input current
ripple may exceed the theoretical value. Larger capacitor will
reduce the ripple further.
Boost Inductor
The inductor has peak and average current decided by:
? I
2
I O
1-D
The inductor should be chosen to be able to handle this
current. Furthermore, due to the fixed internal
compensation, it is recommended that maximum inductance
of 10μH and 15μH to be used in the 5V and 12V or higher
output voltage, respectively.
Elantec demo board, MBRM120 is selected. Its forward
voltage drop is 450mV at 1A forward current.
Output Capacitor
The EL7581 is specially compensated to be stable with
capacitors which have a worst-case minimum value of 10μF
at the particular V OUT being set. Output ripple voltage
requirements also determine the minimum value and the
type of capacitors. Output ripple voltage consists of two
components - the voltage drop caused by the switching
current though the ESR of the output capacitor and the
charging and discharging of the output capacitor:
V OUT - V IN I OUT
OUT OUT
For low ESR ceramic capacitors, the output ripple is
dominated by the charging/discharging of the output
capacitor.
In addition to the voltage rating, the output capacitor should
also be able to handle the RMS current is given by:
?
?
? I L
( 1 - D ) × ? D + -------------------- × ------ ? × I LAVG
The output diode has average current of I O , and peak
current the same as the inductor's peak current. Schottky
diode is recommended and it should be able to handle those
currents.
I CORMS =
? 2 12 ?
2
? I LAVG ?
1
V BOOST = --------------------- × V FBB
Feedback Resistor Network
An external resistor divider is required to divide the output
voltage down to the nominal reference voltage. Current
drawn by the resistor network should be limited to maintain
the overall converter efficiency. The maximum value of the
resistor network is limited by the feedback input bias current
and the potential for noise being coupled into the feedback
pin. A resistor network in the order of 200k ? is
recommended. The boost converter output voltage is
determined by the following relationship:
R 1 + R 2
R 1
Where V FBB is 1.300V as specified.
A 3.9nF compensation capacitor across the feedback
resistor to ground is recommended to keep the converter in
stable operation at low output current and high frequency
conditions.
Schottky Diode
Speed, forward voltage drop, and reverse current are the
three most critical specifications for selecting the Schottky
diode. The entire output current flows through the diode, so
the diode average current is the same as the average load
current and the peak current is the same as the inductor
peak current. When selecting the diode, one must consider
the forward voltage drop at the peak diode current. On the
12
Positive and Negative Charge Pump (V ON and
V OFF )
The EL7581 contains two independent charge pumps (see
charge pump block and connection diagram.) The negative
charge pump inverts the V DDN supply voltage and provides
a regulated negative output voltage. The positive charge
pump doubles the V DDP supply voltage and provides a
regulated positive output voltage. The regulation of both the
negative and positive charge pumps is generated by the
internal comparator that senses the output voltage and
compares it with and internal reference. The switching
frequency of the charge pump is set to ? the boost converter
switching frequency.
The pumps use pulse width modulation to adjust the pump
period, depending on the load present. The pumps are short-
circuit protected to 180mA at 12V supply and can provide
15mA to 60mA for 6V to 12V supply.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| EL7581IREZ-T13 | 功能描述:IC CONV DC/DC 3-CHAN 20-HTSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| EL7581IREZ-T7 | 功能描述:IC CONV DC/DC 3-CHAN 20-HTSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| EL7583 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:3-Channel DC-DC Converter |
| EL7583_06 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:3-Channel DC/DC Converter |
| EL7583IR | 功能描述:IC CONV DC/DC 3-CHAN 20-TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
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