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參數(shù)資料
| 型號： | MAX1793EUE-15 |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Low-Dropout, Low IQ, 1A Linear Regulator |
| 中文描述： | FIXED/ADJUSTABLE POSITIVE LDO REGULATOR, PDSO16 |
| 封裝： | 1.10 MM HEIGHT, TSSOP-16 |
| 文件頁數(shù)： | 9/10頁 |
| 文件大?。?/td> | 448K |
| 代理商： | MAX1793EUE-15 |
temperature drops approximately 20
°
C. Continuous
short-circuit conditions will result in a pulsed output.
Thermal overload protection is designed to safeguard
the MAX1793 in the event of fault conditions. For con-
tinuous operation, do not exceed the absolute maxi-
mum junction-temperature rating of T
J
= +150
°
C.
Operating Region and Power Dissipation
Maximum power dissipation of the MAX1793 depends
on the thermal resistance of the case and circuit board,
the temperature difference between the die junction
and ambient air, and the rate of air flow. The power dis-
sipated by the device is: P = I
OUT
(V
IN
–
V
OUT
). The
resulting maximum power dissipation is:
P
MAX
= [(T
J(MAX)
–
T
A
) / (
θ
JC
+
θ
CA
)]
where (T
J(MAX)
–
T
A
) is the temperature difference
between the maximum allowed die junction (+150
°
C)
and the surrounding air,
θ
JC
(junction-to-case) is the
thermal resistance of the package chosen, and
θ
CA
is
the thermal resistance from the case through the PC
board, copper traces, and other materials to the sur-
rounding air. Figure 4 shows allowable power dissipa-
tion for typical PC boards at +25
°
C, +50
°
C, and +70
°
C
ambient temperatures.
The MAX1793 TSSOP-EP package features an exposed
thermal pad on its underside. This pad lowers the ther-
mal resistance of the package by providing a direct heat
conduction path from the die to the PC board.
Additionally, the ground pin (GND) also channels heat.
Connect the exposed thermal pad and GND to circuit
ground by using a large pad (minimum 1in
2
recommend-
ed), or multiple vias to the ground plane.
Applications Information
Capacitor Selection
and Regulator Stability
Capacitors are required at the input and output of the
MAX1793. Connect a 4.7μF capacitor between IN and
ground (C
IN
) and a 6.8μF capacitor between OUT and
ground (C
OUT
). C
IN
serves only to lower the source
impedance of the input supply and may be smaller than
4.7μF when the MAX1793 is powered from regulated
power supplies or low-impedance batteries.
The output capacitor
’
s equivalent series resistance (ESR)
affects stability and output noise. C
OUT
ESR should be
0.5
or less to ensure stability and optimum transient
response. Surface-mount ceramic capacitors have very
low ESR and are commonly available in values up to
10μF. Other low-ESR (< 0.5
) capacitors, such as sur-
face-mount tantalum or OS-CON, may also be used.
Connect CINand C
OUT
as close to the IC as possible to
minimize the impact of PC board trace inductance.
Noise, PSRR, and Transient Response
MAX1793 output noise is typically 115μV
RMS
during nor-
mal operation. This is suitably low for most applications.
See the output noise plot in the
Typical Operating
Characteristics
.
The MAX1793 is designed to achieve low dropout volt-
age and low quiescent current in battery-powered sys-
tems while still maintaining good noise, transient
response, and AC rejection. See the
Typical Operating
Characteristics
for a plot of power-supply rejection ratio
(PSRR) versus frequency. When operating from very
noisy sources, supply noise rejection and transient
response can be improved by increasing the values of
the input and output capacitors and employing passive
postfiltering.
Input-Output (Dropout) Voltage
A regulator
’
s minimum input-to-output voltage differential
(dropout voltage) determines the lowest usable supply
voltage. In battery-powered systems, this determines the
useful end-of-life battery voltage. Since a P-channel
MOSFET is used as the pass device, dropout voltage is
the product of R
DS(ON)
and load current (see
Electrical
Characteristics
and Dropout Voltage vs. Load Current in
the
Typical Operating Characteristics
). The MAX1793
operating current typically remains below 225μA in
dropout.
M
Low-Dropout, Low I
Q
, 1A Linear Regulator
_______________________________________________________________________________________
9
0
0.6
0.8
1.6
0.4
0.2
1.0
1.2
1.4
1.8
2.0
1
0
3
2
4
5
6
MAXIMUM OUTPUT CURRENT vs.
INPUT-OUTPUT DIFFERENTIAL VOLTAGE
INPUT-OUTPUT DIFFERENTIAL VOLTAGE (V)
M
MAXIMUM CONTINUOUS CURRENT
M
T
A
= +50
°
C
T
J(MAX)
= +150
°
C
T
A
= +70
°
C
T
A
= +25
°
C
Figure 4. Power Operating Region: Maximum Output Current
vs. Input-Output Differential Voltage
Chip Information
TRANSISTOR COUNT: 845
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1793EUE15+ | 功能描述:低壓差穩(wěn)壓器 - LDO Low-IQ 1A 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(fù)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 |
| MAX1793EUE15+T | 功能描述:低壓差穩(wěn)壓器 - LDO Low-IQ 1A 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(fù)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 |
| MAX1793EUE15-T | 功能描述:低壓差穩(wěn)壓器 - LDO Low-IQ 1A 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(fù)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 |
| MAX1793EUE18 | 功能描述:低壓差穩(wěn)壓器 - LDO Low-IQ 1A 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(fù)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 |
| MAX1793EUE18+ | 功能描述:低壓差穩(wěn)壓器 - LDO Low-IQ 1A 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(fù)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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