参数资料
| 型号： | ISL97644IRZ-T |
| 厂商： | Intersil |
| 文件页数： | 10/15页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST LDO 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： | 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： | 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) |
ISL97644
Operation
The boost converter is a current mode PWM converter
operating at either a 650kHz or 1.2MHz. It can operate in
The current through the MOSFET is limited to 2.6A PEAK .
This restricts the maximum output current (average) based
on the following equation:
I OMAX = ? I LMT – -------- ? × ---------
V O
both discontinuous conduction mode (DCM) at light load and
continuous mode (CCM). In continuous current mode,
current flows continuously in the inductor during the entire
switching cycle in steady state operation. The voltage
? 2 ?
Δ I L V IN
(EQ. 3)
conversion ratio in continuous current mode is given by:
Where Δ I L is peak to peak inductor ripple current, and is set
V Boost 1
V IN
Δ I L = --------- × ----
f s
------------------- = -------------
1 – D
(EQ. 1)
by:
V IN D
L
(EQ. 4)
Where D is the duty cycle of the switching MOSFET.
Figure 13 shows the block diagram of the boost regulator. It
uses a summing amplifier architecture consisting of gm
stages for voltage feedback, current feedback and slope
compensation. A comparator looks at the peak inductor
current cycle by cycle and terminates the PWM cycle if the
current limit is reached.
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 60k Ω is recommended.
where f S is the switching frequency (650kHz or 1.2MHz).
The Table 2 gives typical values (margins are considered
10%, 3%, 20%, 10% and 15% on V IN , V O , L, f S and I OMAX ).
Capacitor
An input capacitor is used to suppress the voltage ripple
injected into the boost converter. The ceramic capacitor with
capacitance larger than 10μF is recommended. The voltage
rating of input capacitor should be larger than the maximum
input voltage. Some capacitors are recommended in Table 1
for input capacitor.
TABLE 1. BOOST CONVERTER INPUT CAPACITOR
RECOMMENDATION
The boost converter output voltage is determined by the
following equation:
CAPACITOR
10μF/16V
SIZE
1206
MFG
TDK
PART NUMBER
C3216X7R1C106M
V Boost = --------------------- × V FB
R 1 + R 2
R 2
(EQ. 2)
10μF/10V
22μF/10V
0805
1210
Murata
Murata
GRM21BR61A106K
GRB32ER61A226K
TABLE 2. MAXIMUM OUTPUT CURRENT CALCULATION
V IN (V)
3
3
3
5
5
5
5
3
3
3
5
5
5
5
V O (V)
9
12
15
9
12
15
18
9
12
15
9
12
15
18
L (μH)
10
10
10
10
10
10
10
10
10
10
10
10
10
10
F s (MHz)
0.65
0.65
0.65
0.65
0.65
0.65
0.65
1.2
1.2
1.2
1.2
1.2
1.2
1.2
I OMAX (mA)
636
419
289
1060
699
482
338
742
525
395
1236
875
658
514
10
FN9228.1
December 14, 2007
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| ISL97644IRZ-TK | 功能描述:IC REG BOOST LDO VON VCOM 24-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 应用说明:Ultrasound Imaging Systems Application Note 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:37 系列:- 应用:医疗用超声波成像，声纳 电流 - 电源:- 电源电压:2.37 V ~ 6 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:56-WFQFN 裸露焊盘 供应商设备封装:56-TQFN-EP（8x8） 包装:管件 |
| ISL97645AIRZ | 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:- 应用说明:Ultrasound Imaging Systems Application Note 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:37 系列:- 应用:医疗用超声波成像，声纳 电流 - 电源:- 电源电压:2.37 V ~ 6 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:56-WFQFN 裸露焊盘 供应商设备封装:56-TQFN-EP（8x8） 包装:管件 |
| ISL97645AIRZ-T | 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:- 应用说明:Ultrasound Imaging Systems Application Note 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:37 系列:- 应用:医疗用超声波成像，声纳 电流 - 电源:- 电源电压:2.37 V ~ 6 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:56-WFQFN 裸露焊盘 供应商设备封装:56-TQFN-EP（8x8） 包装:管件 |
| ISL97645AIRZ-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:- 应用说明:Ultrasound Imaging Systems Application Note 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:37 系列:- 应用:医疗用超声波成像，声纳 电流 - 电源:- 电源电压:2.37 V ~ 6 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:56-WFQFN 裸露焊盘 供应商设备封装:56-TQFN-EP（8x8） 包装:管件 |
| ISL97645IRZ-T | 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 |
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