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參數資料
| 型號： | LTC3026EMSE |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 1.5A Low Input Voltage VLDO Linear Regulator |
| 中文描述： | 0.4 V-2.6 V ADJUSTABLE POSITIVE LDO REGULATOR, 0.25 V DROPOUT, PDSO10 |
| 封裝： | PLASTIC, MSOP-10 |
| 文件頁數： | 9/16頁 |
| 文件大?。?/td> | 201K |
| 代理商： | LTC3026EMSE |
LTC3026
9
3026f
Figure 3. Programming the LTC3026
OPERATIOU
V
OUT
ADJ
GND
C
OUT
R2
R1
LTC3026
3026 F02
V
OUT
= 0.4V (1 + R1
Adjustable Output Voltage
The output voltage is set by the ratio of two external
resistors as shown in Figure 3. The device servos the
output to maintain the ADJ pin voltage at 0.4V (referenced
to ground). Thus, the current in R1 is equal to 0.4V/R1. For
good transient response, stability and accuracy the cur-
rent in R1 should be at least 80
μ
A, thus, the value of R1
should be no greater than 5k. The current in R2 is the
current in R1 plus the ADJ pin bias current. Since the ADJ
pin bias current is typically <10nA it can be ignored in the
output voltage calculation. The output voltage can be
calculated using the formula in Figure 3. Note that in
shutdown the output is turned off and the divider current
will be zero once C
OUT
is discharged.
The LTC3026 operates at a relatively high gain of
270
μ
V/A refered to the ADJ input. Thus, a load current
change of 1mA to 1.5A produces a 400
μ
V drop at the ADJ
input. To calculate the change in the output, simply mul-
tiply by the gain of the feedback network (i.e. 1 + R2/R1).
For example, to program the output for 1.2V choose R2/
R1 = 2. In this example an output current change of 1mA
to 1.5A produces –400
μ
V (1 + 2) = 1.2mV drop at the
output.
Power Good Operation
The LTC3026 includes an open-drain power good (PG)
output pin with hysteresis. If the chip is in shutdown or
under UVLO conditions (V
BST
< 4.25V), PG is low imped-
ance to ground. PG becomes high impedance when V
OUT
rises to 93% of its regulation voltage. PG stays high
impedance until V
OUT
falls back down to 91% of its
regulation value. A pull-up resistor can be inserted be-
tween PG and a positive logic supply (such as IN, OUT,
BST, etc.) to signal a valid power good condition. V
IN
should be the minimum operating voltage (1.14V) or
greater for PG to function correctly.
Output Capacitance and Transient Response
The LTC3026 is designed to be stable with a wide range of
ceramic output capacitors. The ESR of the output capaci-
tor affects stability, most notably with small capacitors. An
output capacitor of 10
μ
F or greater with an ESR of 0.05
or less is recommended to ensure stability. The LTC3026
is a micropower device and output transient response will
be a function of output capacitance. Larger values of
output capacitance decrease the peak deviations and
provide improved transient response for larger load cur-
rent changes. Note that bypass capacitors used to decouple
Figure 1. Output Load Step Response
I
OUT
1.5A
0mA
OUT
AC 20mV/DIV
200
μ
s/DIV
V
OUT
= 1.5V
C
OUT
= 10
μ
F
V
IN
= 1.7V
V
B
= 5V
SHDN
OUT
PG
HI
LO
100
μ
s/DIV
T
A
= 25
°
C
R
OUT
= 1
V
IN
= 1.7V
V
B
= 5V
Figure 2. Soft-Start with Boost Disable
1.5V
1.5V
0V
0V
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LTC3026EMSE#PBF | 功能描述:IC REG LDO ADJ 1.5A 10-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標準包裝:1 系列:- 穩(wěn)壓器拓撲結構:正，固定式 輸出電壓:8V 輸入電壓:10.5 V ~ 23 V 電壓 - 壓降（標準）:1.7V @ 40mA 穩(wěn)壓器數量:1 電流 - 輸出:100mA（最小值） 電流 - 限制（最?。?- 工作溫度:0°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:8-SOIC 包裝:剪切帶 (CT) 產品目錄頁面:1075 (CN2011-ZH PDF) 其它名稱:296-24390-1 |
| LTC3026EMSE#PBF | 制造商:Linear Technology 功能描述:Linear Voltage Regulator IC |
| LTC3026EMSE#TR | 制造商:Linear Technology 功能描述:LDO Regulator Pos 0.4V to 2.6V 1.5A 10-Pin MSOP EP T/R |
| LTC3026EMSE#TRPBF | 功能描述:IC REG LDO ADJ 1.5A 10-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標準包裝:800 系列:- 穩(wěn)壓器拓撲結構:正，固定式 輸出電壓:2.5V 輸入電壓:最高 16V 電壓 - 壓降（標準）:0.7V @ 4A 穩(wěn)壓器數量:1 電流 - 輸出:4A 電流 - 限制（最小）:4.2A 工作溫度:0°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:TO-263-6，D²Pak（5 引線+接片），TO-263BA 供應商設備封裝:TO-263-5 包裝:帶卷 (TR) 其它名稱:AP1184K525L-13AP1184K525LDITR |
| LTC3026EMSE-1#PBF | 制造商:Linear Technology 功能描述:LDO Regulator Pos 0.4V to 2.6V 1.5A 10-Pin MSOP EP 制造商:Linear Technology 功能描述:IC REG LDO ADJ 1.5A 10MSOP |
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