參數(shù)資料
型號(hào)： LT1587CT-3.6
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 基準(zhǔn)電壓源/電流源
英文描述： 7A, 4.6A, 3A Low Dropout Fast Response Positive Regulators Adjustable and Fixed
中文描述： 3.6 V FIXED POSITIVE LDO REGULATOR, 1.3 V DROPOUT, PSFM3
封裝： PLASTIC, TO-220, 3 PIN
文件頁(yè)數(shù)： 7/12頁(yè)
文件大小： 276K
代理商： LT1587CT-3.6
7
LT1584/LT1585/LT1587
APPLICATIO
S I
N
FOR
ATIO
U
General
The LT1584/LT1585/LT1587 family of three-terminal
regulators is easy to use and has all the protection features
expected in high performance linear regulators. The de-
vices are short-circuit protected, safe-area protected, and
provide thermal shutdown to turn off the regulators
should the junction temperature exceed about 150
°
C. The
LT1584/LT1585/LT1587 family includes adjustable and
fixed voltage versions.
These ICs are pin compatible with the LT1083/LT1084/
LT1085 family of linear regulators but offer lower dropout
voltage and faster transient response. The trade-off for this
improved performance is a 7V maximum supply voltage.
Similar to the LT1083/LT1084/LT1085 family, the LT1584/
LT1585/LT1587 regulators require an output capacitor for
stability. However, the improved frequency compensation
permits the use of capacitors with much lower ESR while still
maintaining stability. This is critical in addressing the needs
of modern, low voltage, high speed microprocessors.
Current generation microprocessors cycle load current
from almost zero to amps in tens of nanoseconds. Output
voltage tolerances are tighter and include transient re-
sponse as part of the specification. The LT1584/LT1585/
W
U
LT1587 family is specifically designed to meet the fast
current load-step requirements of these microprocessors
and saves total cost by needing less output capacitance in
order to maintain regulation.
Stability
The circuit design in the LT1584/LT1585/LT1587 family
requires the use of an output capacitor as part of the
frequency compensation. For all operating conditions, the
addition of a 22
μ
F solid tantalum or a 100
μ
F aluminum
electrolytic on the output ensures stability. Normally, the
LT1584/LT1585/LT1587 can use smaller value capacitors.
Many different types of capacitors are available and have
widely varying characteristics. These capacitors differ in
capacitor tolerance (sometimes ranging up to
±
100%),
equivalent series resistance, equivalent series inductance,
and capacitance temperature coefficient. The LT1584/
LT1585/LT1587 frequency compensation optimizes fre-
quency response with low ESR capacitors. In general, use
capacitors with an ESR of less than 1
.
On the adjustable LT1584/LT1585/LT1587, bypassing the
adjust terminal improves ripple rejection and transient
response. Bypassing the adjust pin increases the required
output capacitor value. The value of 22
μ
F tantalum or
THERMAL
LIMIT
GND
FOR FIXED VOLTAGE DEVICE
V
IN
V
OUT
LT1584 BD
ADJ
–
+
SW
W
相關(guān)PDF資料
PDF描述
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LT1587 3A Low Dropout Fast Response Positive Regulators Adjustable and Fixed(3A，低壓差，快速響應(yīng)正輸出穩(wěn)壓器（固定和可調(diào)輸出電壓）)
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