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| 型号： | ISL97519AIUZ-T |
| 厂商： | Intersil |
| 文件页数： | 7/9页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 1A 8MSOP |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 5 V ~ 25 V |
| 输入电压： | 2.3 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 600kHz，1.2MHz |
| 电流 - 输出： | 1A |
| 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： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-MSOP |
ISL97519A
I L = I L-AVG + ( 1 ? 2 × Δ I L )
V IN × [ ( V O + V DIODE ) – V IN ] (EQ. 9)
Δ I L = ------------------------------------------------------------------------
I OUT
I L-AVG = -------------
Schottky Diode
In selecting the Schottky diode, the reverse break down
voltage, forward current and forward voltage drop must be
considered for optimum converter performance. The diode
must be rated to handle 2.0A, the current limit of the
ISL97519A. The breakdown voltage must exceed the
maximum output voltage. Low forward voltage drop, low
leakage current, and fast reverse recovery will help the
converter to achieve the maximum efficiency.
Input Capacitor
The value of the input capacitor depends the input and output
voltages, the maximum output current, the inductor value and
the noise allowed to put back on the input line. For most
applications, a minimum 10μF is required. For applications
that run close to the maximum output current limit, input
capacitor in the range of 22μF to 47μF is recommended.
The ISL97519A is powered from the VIN. A high frequency
0.1μF bypass capacitor is recommended to be close to the VIN
pin to reduce supply line noise and ensure stable operation.
Loop Compensation
The ISL97519A incorporates a transconductance amplifier in
its feedback path to allow the user some adjustment on the
transient response and better regulation. The ISL97519A uses
current mode control architecture which has a fast current
sense loop and a slow voltage feedback loop. The fast current
feedback loop does not require any compensation. The slow
voltage loop must be compensated for stable operation. The
compensation network is a series RC network from COMP pin
to ground. The resistor sets the high frequency integrator gain
for fast transient response and the capacitor sets the
integrator zero to ensure loop stability. For most applications,
the compensation resistor in the range of 0.5k to 7.5k and the
compensation capacitor in the range of 3nF to 10nF.
enough that it doesn't reach 0.6V before the output voltage
reaches the final value.
When the ISL97519A is disabled, the soft-start capacitor will
be discharged to ground.
Frequency Selection
The ISL97519A switching frequency can be user selected to
operate at either constant 620kHz or 1.25MHz. Connecting
F SEL pin to ground sets the PWM switching frequency to
620kHz. When connecting F SEL high or V DD , the switching
frequency is set to 1.25MHz.
Shutdown Control
When the EN pin is pulled down, the ISL97519A is shutdown
reducing the supply current to <1μA.
Maximum Output Current
The MOSFET current limit is nominally 2.0A and guaranteed
1.5A when V DD is greater than 2.8V. This restricts the
maximum output current, I OMAX , based on Equation 8:
(EQ. 8)
where:
I L = MOSFET current limit
I L-AVG = average inductor current
Δ I L = inductor ripple current
L × ( V O + V DIODE ) × F S
V DIODE = Schottky diode forward voltage, typically, 0.6V
F S = switching frequency, 600kHz or 1.2MHz
(EQ. 10)
1 – D
V IN
V OUT + V DIODE
Soft-Start
During power-up, assuming EN is tied to VDD, as VDD rises
above VDD UVLO, the SS capacitor begins to charge up with a
constant 3μA current. During the time the part takes to rise to
60mV the boost will not be enabled. Depending on the value of
the capacitor on the SS pin, this provides sufficient (540μs for
a 27nf capacitor or 2ms for a 100nf capacitor) time for the
passive in-rush current to settle down, allowing the output
D = MOSFET turn-on ratio:
D = 1 – ---------------------------------------
Table 1 gives typical maximum I OUT values for 1.2MHz
switching frequency and 10μH inductor.
TABLE 1. TYPICAL MAXIMUM I OUT VALUES
(EQ. 11)
capacitors to be charged to a diode drop below VDD.
After the SS pin passes above the threshold beyond which the
part is enabled (60mV) the part begins to switch. The linearly
rising SS voltage, at a charge rate proportional to 3μA, has a
direct effect on the current limit allowing the current limit to
linearly ramp-up to full current limit. SS voltage of 200mV
corresponds to a current limit around 350mA and 0.6V
corresponds to full current limit.
V IN (V)
3.3
3.3
3.3
5
5
V OUT (V)
5
9
12
9
12
I OMAX (mA)
1150
655
500
990
750
t ss = ---------------------------- = Css × 2 × 10
The total soft-start time is calculated in Equation 7:
Css × 0.6V 5
3 μ A
(EQ. 7)
Cascaded MOSFET Application
A 25V N-Channel MOSFET is integrated in the boost regulator.
For applications where the output voltage is greater than 25V,
The full current is available after the soft-start period is
finished. The soft-start capacitor should be selected to be big
7
an external cascaded MOSFET is needed as shown in Figure
14. The voltage rating of the external MOSFET should be
greater than A VDD .
FN6683.3
February 16, 2012
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| ISL97519AIUZ-TK | 功能描述:IC REG BOOST ADJ 1A 8MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:两者兼有 输出数:1 输出电压:5V，1 V ~ 10 V 输入电压:3.5 V ~ 28 V PWM 型:电流模式 频率 - 开关:220kHz ~ 1MHz 电流 - 输出:600mA 同步整流器:无 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:16-SSOP（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:16-QSOP |
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