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參數(shù)資料
| 型號： | TC1264-1.8VEB |
| 元件分類： | 固定正電壓單路輸出LDO穩(wěn)壓器 |
| 英文描述： | 1.8 V FIXED POSITIVE LDO REGULATOR, 1.4 V DROPOUT, PSSO3 |
| 封裝： | D2PAK-3 |
| 文件頁數(shù)： | 3/8頁 |
| 文件大?。?/td> | 55K |
| 代理商： | TC1264-1.8VEB |
3
800mA Fixed Output CMOS LDO
TC1264
TC1264-4 3/28/00
Figure 1: Typical Application Circuit
Output Capacitor
A 1
μ
F (min) capacitor from V
OUT
to ground is required.
The output capacitor should have an effective series resis-
tance of 5
or less. A 1
μ
F capacitor should be connected
from V
IN
to GND if there is more than 10 inches of wire
between the regulator and the AC filter capacitor, or if a
battery is used as the power source. Aluminum electrolytic
or tantalum capacitor types can be used. (Since many
aluminum electrolytic capacitors freeze at approximately –
30
°
C, solid tantalums are recommended for applications
operating below –25
°
C.) When operating from sources
other than batteries, supply-noise rejection and transient
response can be improved by increasing the value of the
input and output capacitors and employing passive filtering
techniques.
Thermal Considerations
Thermal Shutdown
Integrated thermal protection circuitry shuts the regula-
tor off when die temperature exceeds 160
°
C. The regulator
remains off until the die temperature drops to approximately
150
°
C.
Power Dissipation
The amount of power the regulator dissipates is prima-
rily a function of input and output voltage, and output current.
The following equation is used to calculate worst case
actual
power dissipation:
DETAILED DESCRIPTION
The TC1264 is a precision, fixed output LDO. Unlike
bipolar regulators, the TC1264 supply current does not
increase with load current. In addition, V
OUT
remains stable
and within regulation at very low load currents (an important
consideration in RTC and CMOS RAM battery backup
applications). Figure 1 shows a typical application circuit.
C1
1
μ
F
Battery
TC1264
GND
V
IN
V
OUT
C2
1
μ
F
V
OUT
P
D
≈
(V
INMAX
– V
OUTMIN
)I
LOADMAX
Where:
P
D
= worst case actual power dissipation
V
INMAX
= maximum voltage on V
IN
V
OUTMIN
= minimum regulator output voltage
I
LOADMAX
= maximum output (load) current
Equation 1.
The maximum
allowable
power dissipation (Equation 2)
is a function of the maximum ambient temperature (T
AMAX
),
the maximum allowable die temperature (125
°
C) and the
thermal resistance from junction-to-air (
JA
).
P
DMAX
= (T
JMAX
– T
AMAX
)
JA
Where all terms are previously defined.
Equation 2.
Table 1 shows various values of
JA
for the TC1264
mounted on a 1/16 inch, 2-layer PCB with 1 oz. copper foil.
Table 1. Thermal Resistance Guidelines for TC1264 in
3-Pin SOT-223 Package
Copper
Area
(Topside)*
Copper
Area
(Backside)
Thermal
Resistance
(
JA
)
45
°
C/W
45
°
C/W
53
°
C/W
59
°
C/W
52
°
C/W
55
°
C/W
Board
Area
2500 sq mm
1000 sq mm
225 sq mm
100 sq mm
1000 sq mm
1000 sq mm
NOTES:
*Tab of device attached to topside copper
2500 sq mm
2500 sq mm
2500 sq mm
2500 sq mm
1000 sq mm
0 sq mm
2500 sq mm
2500 sq mm
2500 sq mm
2500 sq mm
1000 sq mm
1000 sq mm
Table 2. Thermal Resistance Guidelines for TC1264 in
3-Pin DDPAK/TO-220 Package
Copper
Area
(Topside)*
Copper
Area
(Backside)
Thermal
Resistance
(
JA
)
25
°
C/W
27
°
C/W
35
°
C/W
Board
Area
2500 sq mm
1000 sq mm
125 sq mm
NOTES:
*Tab of device attached to topside copper
2500 sq mm
2500 sq mm
2500 sq mm
2500 sq mm
2500 sq mm
2500 sq mm
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TC1264-2.5VAB | 2.5 V FIXED POSITIVE LDO REGULATOR, 1.3 V DROPOUT, PSFM3 |
| TC1264-2.5VDBRT | 2.5 V FIXED POSITIVE LDO REGULATOR, 1.3 V DROPOUT, PSSO3 |
| TC1264-2.5VDBTR | 2.5 V FIXED POSITIVE LDO REGULATOR, 1.3 V DROPOUT, PSSO3 |
| TC1264-2.5VEBRT | 2.5 V FIXED POSITIVE LDO REGULATOR, 1.3 V DROPOUT, PSSO3 |
| TC1264-2.5VEBTR | 2.5 V FIXED POSITIVE LDO REGULATOR, 1.3 V DROPOUT, PSSO3 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TC1264-2.5VAB | 功能描述:低壓差穩(wěn)壓器 - LDO 800mA Fixed Output 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(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TC1264-2.5VDB | 制造商:Microchip Technology 功能描述:LDO Regulator Pos 2.5V 0.8A 4-Pin(3+Tab) SOT-223 制造商:Microchip Technology Inc 功能描述:REG LDO LIN FIX POS 2.5V 0.8A 4PIN SOT-223 - Bulk 制造商:Microchip Technology Inc 功能描述:IC LDO 800MA 2.5V SOT-223 |
| TC1264-2.5VDBTR | 功能描述:低壓差穩(wěn)壓器 - LDO 800mA Fixed Output 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(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TC1264-2.5VEB | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:800 mA Fixed-Output CMOS LDO with Shutdown |
| TC1264-2.5VEBTR | 功能描述:低壓差穩(wěn)壓器 - LDO 800mA Fixed Output 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(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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