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参数资料
| 型号： | ISL97645IRZ-T |
| 厂商： | Intersil |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST VON VCOM 24-QFN |
| 标准包装： | 6,000 |
| 应用： | LCD 监视器，笔记本电脑显示器 |
| 电流 - 电源： | 1mA |
| 电源电压： | 2.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-VFQFN 裸露焊盘 |
| 供应商设备封装： | 24-QFN 裸露焊盘（4x4） |
| 包装： | 带卷 (TR) |
ISL97645A
Inductor
The boost inductor is a critical part which influences the
output voltage ripple, transient response, and efficiency.
Values of 3.3μH to 10μH are used to match the internal
slope compensation. The inductor must be able to handle
the following average and peak current are in Equation 5:
For low ESR ceramic capacitors, the output ripple is
dominated by the charging and discharging of the output
capacitor. The voltage rating of the output capacitor should
be greater than the maximum output voltage.
Note: Capacitors have a voltage coefficient that makes their
effective capacitance drop as the voltage across then
I LAVG = -------------
I LPK = I LAVG + --------
I O
1 – D
Δ I L
2
Some inductors are recommended in Table 3.
(EQ. 5)
increases. C OUT in the equation above assumes the
effective value of the capacitor at a particular voltage and not
the manufacturer ’s stated value, measured at 0V.
Table 5 shows some selections of output capacitors.
TABLE 5. BOOST OUTPUT CAPACITOR RECOMMENDATION
TABLE 3. BOOST INDUCTOR RECOMMENDATION
CAPACITOR
SIZE
MFG
PART NUMBER
INDUCTOR
6.8μH/3A PEAK
DIMENSIONS
(mm)
7.3x6.8x3.2
MFG
TDK
PART NUMBER
RLF7030T-6R8N3R0
10μF/25V
10μF/25V
1210
1210
TDK
Murata
C3225X7R1E106M
GRM32DR61E106K
10μH/4A PEAK
8.3x8.3x4.5
Sumida
CDR8D43-100NC
Compensation
5.2μH/4.55A PEAK 10x10.1x3.8
Cooper
Bussmann
CD1-5R2
The boost converter of ISL97645A can be compensated by
a RC network connected from CM1 pin to ground. 4.7nF and
10k RC network is used in the demo board. The larger value
Rectifier Diode
A high-speed diode is necessary due to the high switching
frequency. Schottky diodes are recommended because of
their fast recovery time and low forward voltage. The reverse
voltage rating of this diode should be higher than the
maximum output voltage. The rectifier diode must meet the
output current and peak inductor current requirements. The
following table is some recommendations for boost converter
diode.
resistor and lower value capacitor can lower the transient
overshoot, however, at the expense of stability of the loop.
Cascaded MOSFET Application
An 20V N-Channel MOSFET is integrated in the boost
regulator. For the applications where the output voltage is
greater than 20V, an external cascaded MOSFET is needed
as shown in Figure 14. The voltage rating of the external
MOSFET should be greater than A VDD .
TABLE 4. BOOST CONVERTER RECTIFIER DIODE
RECOMMENDATION
V IN
A VDD
DIODE
SS23
V R /I AVG RATING
30V/2A
PACKAGE
SMB
MFG
Fairchild
Semiconductor
MBRS340
SL23
40V/3A
30V/2A
SMC
SMB
International
Rectifier
Vishay
INTERSIL
ISL97645A
LX
FB
Semiconductor
Output Capacitor
The output capacitor supplies the load directly and reduces
the ripple voltage at the output. Output ripple voltage
consists of two components:
1. the voltage drop due to the inductor ripple current flowing
through the ESR of output capacitor.
2. charging and discharging of the output capacitor.
FIGURE 14. CASCADED MOSFET TOPOLOGY FOR HIGH
OUTPUT VOLTAGE APPLICATIONS
V RIPPLE = I LPK × ESR + ------------------------ × ---------------- × ----
11
V O – V IN I O 1
V O C OUT f s
(EQ. 6)
FN6353.1
October 21, 2010
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相关代理商/技术参数 |
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| ISL97645IRZ-TK | 功能描述:IC REG BOOST VON VCOM 24-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 标准包装:1 系列:- 应用:手持/移动设备 电流 - 电源:- 电源电压:3 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-WFDFN 裸露焊盘 供应商设备封装:14-LLP-EP（4x4） 包装:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名称:LP3905SD-30DKR |
| ISL97646IRZ-EVALZ | 功能描述:BOARD EVALUATION FOR ISL97646 RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| ISL97646IRZ-T | 功能描述:直流/直流开关调节器 ISL97646IRZOOST +L DO +VON SLICE +VCOM RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| ISL97646IRZ-TK | 功能描述:直流/直流开关调节器 ISL97646IRZOOST +L DO +VON SLICE +VCOM RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| ISL97648IRTZ | 功能描述:IC BOOST DC/DC REG RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:2,000 系列:- 应用:控制器，DSP 输入电压:4.5 V ~ 25 V 输出数:2 输出电压:最低可调至 1.2V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:30-TFSOP（0.173"，4.40mm 宽） 供应商设备封装:30-TSSOP 包装:带卷 (TR) |
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