- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384533 > ISL97536IUZ (INTERSIL CORP) Monolithic 1A Step-Down Regulator with Low Quiescent Current PDF資料下載
參數(shù)資料
| 型號： | ISL97536IUZ |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Monolithic 1A Step-Down Regulator with Low Quiescent Current |
| 中文描述： | 1.5 A SWITCHING REGULATOR, 1600 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | ROHS COMPLIANT, MSOP-10 |
| 文件頁數(shù)： | 7/9頁 |
| 文件大?。?/td> | 265K |
| 代理商： | ISL97536IUZ |
7
FN6279.0
October 5, 2006
Applications Information
Product Description
The ISL97536 is a synchronous, integrated FET 1A
step-down regulator which operates from an input of 2.5V to
6V. The output voltage is user-adjustable with a pair of
external resistors.
The internally-compensated controller makes it possible to
use only two ceramic capacitors and one inductor to form a
complete, very small footprint 1A DC:DC converter.
PWM Operation
In PWM switching mode, the P-channel MOSFET and
N-channel MOSFET always operate complementary. When
the P-channel MOSFET is on and the N-channel MOSFET
off, the inductor current increases linearly. The input energy
is transferred to the output and also stored in the inductor.
When the P-channel MOSFET is off and the N-channel
MOSFET on, the inductor current decreases linearly, and
energy is transferred from the inductor to the output. Hence,
the average current through the inductor is the output
current. Since the inductor and the output capacitor act as a
low pass filter, the duty cycle ratio is approximately equal to
V
O
divided by V
IN
.
The output LC filter has a second order effect. To maintain
the stability of the converter, the overall controller must be
compensated. This is done with the fixed internally
compensated error amplifier and the PWM compensator.
Because the compensations are fixed, the values of input
and output capacitors are 10μF to 40μF ceramic and
inductor is 1.5μH to 2.2μH.
Start-Up and Shutdown
When the EN pin is tied to V
IN
, and V
IN
reaches
approximately 2.4V, the regulator begins to switch. The
inductor current limit is gradually increased to ensure proper
soft-start operation.
When the EN pin is connected to a logic low, the ISL97536 is
in the shutdown mode. All the control circuitry and both
MOSFETs are off, and V
OUT
falls to zero. In this mode, the
total input current is less than 1μA.
When the EN reaches logic HI, the regulator repeats the
start-up procedure, including the soft-start function.
Current Limit and Short-Circuit Protection
The current limit is set at about 1.5A for the PMOS. When a
short-circuit occurs in the load, the preset current limit
restricts the amount of current available to the output, which
causes the output voltage to drop as load demand
increases. When the output voltage drops 30mV below the
reference voltage, the converter will shutdown for a period of
time, approximated by Equation 1, and then restart. If the
overcurrent condition still exists, it will repeat the shutdown-
wait-restart event. This is called a “hiccup” event. The
average power dissipation is reduced, thereby reducing the
likelihood of damage current and thermal conditions in the IC.
Thermal Shutdown
Once the junction reaches about 145°C, the regulator shuts
down. Both the P-channel and the N-channel MOSFETs turn
off. The output voltage will drop to zero. With the output
MOSFETs turned off, the regulator will cool down. Once the
junction temperature drops to about 130°C, the regulator will
perform a normal restart.
Thermal Performance
The ISL97536 is available in a fused-lead MSOP10.
Compared with regular MSOP10 package, the fused-lead
package provides lower thermal resistance. The
θ
JA
is
+100°C/W on a 4-layer board and +125°C/W on 2-layer
board. Maximizing the copper area around the pins will
further improve the thermal performance.
RSI/POR Function
When powering up, the open-collector Power-On-Reset
output holds low for about 100ms after V
O
reaches the
preset voltage. When the active-HI reset signal RSI is
issued, POR goes to low immediately and holds for the
same period of time after RSI comes back to LOW. The
output voltage is unaffected. (Please refer to the timing
diagram). When the function is not used, connect RSI to
ground and leave open the pull-up resister R
4
at POR pin.
The POR output also serves as a 100ms delayed Power
Good signal when the pull-up resister R
4
is installed. The
RSI pin needs to be directly (or indirectly through a resister
R
6
) connected to Ground for this to function properly.
Output Voltage Selection
Users can set the output voltage of the variable version with
a resister divider, which can be chosen based on the
following formula:
tHICCUP
700
μ
V
---------------------------
216
μ
+
≈
(EQ. 1)
100ms
MIN
25ns
100ms
POR
RSI
V
O
FIGURE 18. RSI AND POR TIMING DIAGRAM
V
O
0.8
1
R
2
R
1
------
+
×
=
(EQ. 2)
ISL97536
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ISL97536IUZ-T | Monolithic 1A Step-Down Regulator with Low Quiescent Current |
| ISL97536IUZ-TK | Monolithic 1A Step-Down Regulator with Low Quiescent Current |
| ISL97631 | White LED Boost Regulator With Integrated Schottky Diode |
| ISL97631IHTZ-T7 | White LED Boost Regulator With Integrated Schottky Diode |
| ISL97631IHTZ-T7A | White LED Boost Regulator With Integrated Schottky Diode |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL97536IUZ-T | 功能描述:IC REG BUCK SYNC ADJ 1A 10MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:5 V ~ 25 V 輸入電壓:2.3 V ~ 5.5 V PWM 型:電流模式 頻率 - 開關(guān):600kHz，1.2MHz 電流 - 輸出:1A 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 包裝:管件 供應(yīng)商設(shè)備封裝:8-MSOP |
| ISL97536IUZ-TK | 功能描述:IC REG BUCK SYNC ADJ 1A 10MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:5 V ~ 25 V 輸入電壓:2.3 V ~ 5.5 V PWM 型:電流模式 頻率 - 開關(guān):600kHz，1.2MHz 電流 - 輸出:1A 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 包裝:管件 供應(yīng)商設(shè)備封裝:8-MSOP |
| ISL97631HTZ-T7A | 制造商:Intersil Corporation 功能描述: |
| ISL97631IHTZ | 制造商:Intersil 功能描述:6 LEDs Driver with Integrated Schottky Diode with OVP |
| ISL97631IHTZ-T7 | 功能描述:IC LED DRIVR WHITE BCKLGT TSOT-6 RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動器 系列:- 標(biāo)準(zhǔn)包裝:60 系列:- 恒定電流:- 恒定電壓:- 拓撲:線性（LDO），PWM，升壓（升壓） 輸出數(shù):8 內(nèi)部驅(qū)動器:是 類型 - 主要:背光 類型 - 次要:RGB，白色 LED 頻率:500kHz ~ 1.5MHz 電源電壓:4.75 V ~ 26 V 輸出電壓:45V 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:* 工作溫度:-40°C ~ 85°C |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。