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参数资料
| 型号： | ISL97645IRZ-TK |
| 厂商： | Intersil |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST VON VCOM 24-QFN |
| 标准包装： | 1,000 |
| 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
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 Equation 3:
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
Equation 1:
Where Δ I L is peak to peak inductor ripple current, and is set
by Equation 4:
V Boost 1
V IN
Δ I L = --------- × ----
f s
------------------- = -------------
1 – D
(EQ. 1)
V IN D
L
(EQ. 4)
Where D is the duty cycle of the switching MOSFET.
Figure 12 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
where f S is the switching frequency (650kHz or 1.2MHz).
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
pin. A resistor network in the order of 60k Ω is recommended.
The boost converter output voltage is determined by
Equation 2:
CAPACITOR
10μF/16V
10μF/10V
SIZE
1206
0805
MFG
TDK
Murata
PART NUMBER
C3216X7R1C106M
GRM21BR61A106K
V Boost = --------------------- × V FB
R 1 + R 2
R 2
(EQ. 2)
22μF/10V
1210
Murata
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
FN6353.1
October 21, 2010
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| 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) |
| ISL97648IRTZ-T | 制造商:Intersil Corporation 功能描述:HIGH VOLTAGE TFT-LCD LOGIC DRIVER (56 LD TQFN 8X8) - Tape and Reel |
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