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| 型号： | ISL98012IUZ-TK |
| 厂商： | Intersil |
| 文件页数： | 7/10页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 0.6A 10MSOP |
| 标准包装： | 1,000 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 4.5 V ~ 17 V |
| 输入电压： | 1.8 V ~ 13.2 V |
| 频率 - 开关： | 600kHz ~ 750kHz |
| 电流 - 输出： | 600mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-MSOP |
| 其它名称： | ISL98012IUZ-TK-ND |
ISL98012
Typical Performance Curves
(Continued)
I O
100mA/DIV
OUTPUT LOAD CURRENT
Δ V O
0.2ms/DIV
0.5V/DIV
FIGURE 13. LOAD TRANSIENT RESPONSE 10mA TO 30mA,
V IN = 1.8V, FREQ = 56.2k, V O = 15V,
I O = 10mA TO 30mA
10mV/DIV
FIGURE 15. OUTPUT RIPPLE, V IN = 1.8V, V O = 15V, I O = 30mA
Applications Information
The ISL98012 is a fixed frequency step-up pulse-width
modulation (PWM) regulator. The input voltage range is 1.8V
to 13.2V and output voltage range is 4.5V to 17V. The
switching frequency (up to 750kHz) is decided by the
resistor connected to RT pin.
Start-Up
During start-up, as V DD reaches a threshold of about 1.6V, a
start-up oscillator generates a fixed duty-ratio of 0.5 to 0.7 at
a frequency of several hundred kHz. This will boost the
output voltage.
When V DD reaches about 3.7V, the PWM comparator takes
over control. The duty ratio will be decided by the least of the
multiple-input direct summing comparator, the Max_Duty
signal (about 92% duty-ratio), or the Current Limit
Comparator.
7
FIGURE 14. LOAD TRANSIENT RESPONSE, V IN = 5V,
V O = 12V, I O = 50mA TO 300mA
10mV/DIV
FIGURE 16. OUTPUT RIPPLE, V IN = 3.3V, V O = 15V, I O = 30mA
Soft-start is provided by ramping up the current limit
comparator. An internal 12μA current source charges the
external CSS capacitor. The peak MOSFET current is limited
by the voltage on this capacitor. This in turn controls the
rising rate of the output voltage.
The regulator goes through the same start-up sequence as
well after the EN signal is pulled to HI.
Steady-State Operation
When the output reaches the preset voltage, the regulator
operates in steady state. Depending on the input/output
conditions and component values, the inductor operates in
either continuous-conduction mode or discontinuous-conduction
mode.
In continuous-conduction mode, inductor current is a
triangular waveform and LX voltage a pulse waveform. In
discontinuous-conduction mode, inductor current has
FN6654.1
December 8, 2010
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