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參數資料
| 型號： | ISL6413IRZ-TK |
| 廠商： | Intersil |
| 文件頁數： | 10/12頁 |
| 文件大小： | 325K |
| 描述： | IC REG TRPL BCK/LINEAR 24-QFN |
| 標準包裝： | 1,000 |
| 拓撲： | 降壓（降壓）同步（1），線性（LDO）（2） |
| 功能： | 任何功能 |
| 輸出數： | 3 |
| 頻率 - 開關： | 750kHz |
| 電壓/電流 - 輸出 1： | 1.8V，400mA |
| 電壓/電流 - 輸出 2： | 2.84V，300mA |
| 電壓/電流 - 輸出 3： | 2.85V，200mA |
| 帶 LED 驅動器： | 無 |
| 帶監控器： | 無 |
| 帶序列發生器： | 無 |
| 電源電壓： | 3 V ~ 3.6 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-VFQFN 裸露焊盤 |
| 供應商設備封裝： | 24-QFN（4x4） |
| 包裝： | 帶卷 (TR) |
10
voltage, the integrator capacitor voltage is raised or lowered
to compensate for the systematic offset at the error amplifier.
Compensation is limited to ?% to minimize transient
overshoot when the device goes out of dropout, current limit,
or thermal shutdown.
Shutdown
Driving the EN_LDO pin low will put LDO1 and LDO2 into
the shutdown mode. Driving the EN_PWM pin low will put
the PWM into shutdown mode. Pulling the EN_PWM and
EN_LDO both pins low simultaneously, puts the complete
chip into shutdown mode, and supply current drops to 15礎
typical.
Protection Features for the LDOs
Current Limit
The ISL6413 monitors and controls the pass transistors
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.
Thermal Overload Protection
Thermal overload protection limits total power dissipation in
the ISL6413. When the junction temperature (T
J
) exceeds
+150癈, 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 ICs
junction temperature typically cools by 20癈, 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癈.
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
OUT1
x V
OUT1
/I
IN
x V
IN
P2 = I
OUT2
(V
IN
V
OUT2
)
P3 = I
OUT3
(V
IN
- V
OUT3
)
The maximum power dissipation is:
Pmax = (Tjmax T
A
)/窲A
Where Tjmax = 150
o
C, T
A
= ambient temperature, and 窲A
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 ISL6413s 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.
Applications 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 >1礔 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 provides better
PSRR and line transient response. The input capacitor must
be located at a distance of not more then 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 LDOs.
The ISL6413 is specifically designed to work with small
ceramic output capacitors. The output capacitors 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 3.3礔, is recommended
for V
OUT1
for 300mA output current, and 3.3礔 is
recommended for V
OUT2
at 200mA load current. There is no
upper limit to the output capacitor value. Larger capacitor
can reduce noise and improve load transient response,
stability and PSRR. Higher value of output capacitor (10礔)
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 10礖 minimum output inductor is used with the ISL6413
PWM section. Values larger then 15礖 or less then 10礖
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 directly the efficiency
of the converter. Therefore, an inductor with lowest dc
resistance should be selected for highest efficiency.
ISL6413
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相關代理商/技術參數 |
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| ISL6414EVAL1 | 功能描述:EVAL BOARD 1 FOR ISL6414 RoHS:否 類別:編程器，開發系統 >> 評估板 - 線性穩壓器 (LDO) 系列:* 產品變化通告:1Q2012 Discontinuation 30/Mar/2012 設計資源:NCP590MNDPTAGEVB Gerber Files 標準包裝:1 系列:- 每 IC 通道數:2 - 雙 輸出電壓:1.8V，2.8V 電流 - 輸出:300mA 輸入電壓:2.1 ~ 5.5 V 穩壓器類型:正，固定式 工作溫度:-40°C ~ 85°C 板類型:完全填充 已供物品:板 已用 IC / 零件:NCP590MNDP 其它名稱:NCP590MNDPTAGEVB-NDNCP590MNDPTAGEVBOS |
| ISL6414IR | 制造商:Rochester Electronics LLC 功能描述:TRIPLE OUTPUT LOW DROPOUT LINEAR REG. WITH FAULT PIN MODIFIC - Bulk 制造商:Intersil Corporation 功能描述: |
| ISL6414IRZ | 功能描述:低壓差穩壓器 - LDO VER OF ISL6414IR RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節:0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| ISL6414IRZ-TK | 功能描述:低壓差穩壓器 - LDO VER OF ISL6414IR-TK RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節:0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| ISL6415I WAF | 制造商:Intersil Corporation 功能描述: |
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