参数资料
| 型号： | ISL6413EVAL1 |
| 厂商： | Intersil |
| 文件页数： | 6/12页 |
| 文件大小： | 0K |
| 描述： | EVALUATION BOARD ISL6413 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，LDO 步降 |
| 输出及类型： | 3，非隔离 |
| 功率 - 输出： | 2.1W |
| 输出电压： | 1.8V，2.84V，2.84V |
| 电流 - 输出： | 400mA，300mA，200mA |
| 输入电压： | 3 ~ 3.6V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 750kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ISL6413 |
Application Note 1081
Current Limit
The ISL6413 monitors and controls the pass transistor ’s
gate voltage to limit the output current. The current limit for
LDO1 is 330mA and LDO2 is 250mA. The output can be
shorted to ground without damaging the part due to the
current limit and thermal protection features.
Integrated RESET for MAC/Baseband
Processors
The ISL6413 includes a microprocessor supervisory block.
This block eliminates the extra RESET IC and external
components needed in wireless chipset applications. This
block performs a single function; it asserts a RESET signal
whenever the V IN supply voltage decreases below a preset
threshold, keeping it asserted for a programmable time (set
by external capacitor CT) after the V IN pin voltage has risen
above the RESET threshold.
The push pull output stage of the reset circuit provides both
an active-Low and an active-High output. The RESET
threshold for ISL6413 is 2.630V typical.
UVLO Reset threshold is always lower than the RESET
threshold. This insures that as V IN falls, the reset goes low
before the LDOs and PWM are shut off.
Thermal Overload Protection
Thermal overload protection limits total power dissipation in
the ISL6413. When the junction temperature (T J ) exceeds
+150°C, the thermal sensor sends a signal to the shutdown
logic, turning off the pass transistor and allowing the IC to
cool. The pass transistor turns on again after the IC’s
junction temperature typically cools by 20°C, resulting in a
pulsed output during continuous thermal overload
conditions. Thermal overload protection protects the
ISL6413 against fault conditions. For continuous operation,
do not exceed the absolute maximum junction temperature
rating of +150°C.
Operating Region and Power Dissipation
The maximum power dissipation of ISL6413 depends on the
thermal resistance of the IC package and circuit board, the
temperature difference between the die junction and ambient
air, and the rate of air flow. The power dissipated in the
device is:
PT = P1 + P2 + P3, where
P1 = (I OUT x V OUT ) x n, n is efficiency of the PWM
P2 = I OUT1 (V IN - V OUT1 )
P3 = I OUT2 (V IN - V OUT2 )
The maximum power dissipation is:
Pmax = (Tjmax – T A )/ θ JA
Where Tjmax = 150 o C, T A = ambient temperature, and θ JA
is the thermal resistance from the junction to the surrounding
environment.
The ISL6413 package features an exposed thermal pad on
its underside. This pad lowers the thermal resistance of the
package by providing a direct heat conduction path from the
die to the PC board. Additionally, the ISL6413’s ground
(GND_LDO and PGND) performs the dual function of
providing an electrical connection to system ground and
channeling heat away. Connect the exposed backside pad
direct to the GND_LDO ground plane.
Application Information
LDO Regulator Capacitor Selection and Regulator
Stability
Capacitors are required at the ISL6413 LDO regulators’
input and output for stable operation over the entire load
range and the full temperature range. Use >1μF capacitor at
the input of LDO regulators, V IN _LDO pins. The input
capacitor lowers the source impedance of the input supply.
Larger capacitor values and lower ESR provide better PSRR
and line transient response. The input capacitor must be
located at a distance of not more than 0.5 inches from the
V IN pins of the IC and returned to a clean analog ground.
Any good quality ceramic capacitor can be used as an input
capacitor.
The output capacitor must meet the requirements of
minimum amount of capacitance and ESR for both LDO’s.
The ISL6413 is specifically designed to work with small
ceramic output capacitors. The output capacitor ’s ESR
affects stability and output noise. Use an output capacitor
with an ESR of 50m ? or less to insure stability and optimum
transient response. For stable operation, a ceramic
capacitor, with a minimum value of 3.3μF, is recommended
for V OUT1 for 300mA output current, and 3.3μF is
recommended for V OUT2 at 200mA load current. There is no
upper limit to the output capacitor value. A larger capacitor
can reduce noise and improve load transient response,
stability and PSRR. A higher value of output capacitor
(10μF) is recommended for LDO2 when used to power VCO
circuitry in wireless chipsets. The output capacitor should be
located very close to V OUT pins to minimize impact of PC
board inductances and the other end of the capacitor should
be returned to a clean analog ground.
PWM Regulator Component Selection
Inductor Selection
A 10μH typical output inductor is used with the ISL6413
PWM section. Values larger than 15μH or less than 8μH may
cause stability problems because of the internal
compensation of the regulator. The important parameters of
the inductor that need to be considered are the current rating
of the inductor and the DC resistance of the inductor. The
DC resistance of the inductor will influence the efficiency of
6
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| ISL6413IR | 功能描述:IC REG TRPL BCK/LINEAR 24-QFN RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（3），线性（LDO）（2） 功能:任何功能 输出数:5 频率 - 开关:300kHz 电压/电流 - 输出 1:控制器 电压/电流 - 输出 2:控制器 电压/电流 - 输出 3:控制器 带 LED 驱动器:无 带监控器:无 带序列发生器:是 电源电压:5.6 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
| ISL6413IR-T5K | 功能描述:IC REG TRPL BCK/LINEAR 24-QFN RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（3），线性（LDO）（2） 功能:任何功能 输出数:5 频率 - 开关:300kHz 电压/电流 - 输出 1:控制器 电压/电流 - 输出 2:控制器 电压/电流 - 输出 3:控制器 带 LED 驱动器:无 带监控器:无 带序列发生器:是 电源电压:5.6 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
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