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參數資料
| 型號： | MAX1798AEUP |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | CDMA Cellular/PCS System Power Supplies |
| 中文描述： | FIVE OUTPUT, ADJUSTABLE POSITIVE LDO REGULATOR, PDSO20 |
| 封裝： | 4.40 MM, MO-153, TSSOP-20 |
| 文件頁數： | 17/20頁 |
| 文件大?。?/td> | 642K |
| 代理商： | MAX1798AEUP |
M
CDMA Cellular/PCS System
Power Supplies
______________________________________________________________________________________
17
Applications Information
Capacitor Selection and
Regulator Stability
Use a 10μF low-ESR ceramic capacitor on the
MAX1798/MAX1798A/MAX1799/MAX1799A
’
s input if all
the supply inputs are connected together. Larger input
capacitance and lower ESR provide better supply noise
rejection and line-transient response. If IN1, IN2/3, and
IN4/5 are connected to different supply voltages,
bypass each input with a 4.7μF low-ESR ceramic
capacitor.
A minimum 4.7μF low-ESR ceramic capacitor is recom-
mended on OUT1, and a minimum 2.2μF low-ESR
ceramic capacitor is recommended on OUT2
–
5. The
MAX1798/MAX1798A/MAX1799/MAX1799A are stable
with output capacitors in the ESR range of 10m
to 1
.
Use larger capacitors to reduce noise and improve
load-transient response, stability, and power-supply
rejection.
Note that some ceramic dielectrics exhibit large capac-
itance and ESR variation with temperature. With
dielectrics such as Z5U and Y5V, it may be necessary
to use a minimum 4.7μF on OUT2
–
5 to ensure stability
at temperatures below -10
°
C. With X7R or X5R
dielectrics, 2.2μF should be sufficient at all operating
temperatures. Tantalum capacitors may cause instabili-
ty with the MAX1798/MAX1798A/MAX1799/MAX1799A
and are not recommended for this application.
Use a 0.01μF bypass capacitor at BP for low output-
voltage noise. Increasing the capacitance will slightly
decrease the output noise but will increase the startup
time. Values above 0.1μF provide no performance
advantage and are not recommended.
Line-Transient Considerations
The MAX1798/MAX1798A/MAX1799/MAX1799A are
designed to deliver low dropout voltages and low qui-
escent currents in battery-powered systems. Power-
supply rejection is >60dB at low frequencies and rolls
off above 10kHz. See the Power-Supply Rejection Ratio
(PSRR) vs. Frequency graph in the
Typical Operating
Characteristics.
When operating from sources other than batteries,
improved supply noise rejection and transient response
can be achieved by increasing the values of the input
and output bypass capacitors and through passive fil-
tering techniques. The
Typical Operating Character-
istics
show the MAX1798/MAX1798A/MAX1799/
MAX1799A line- and load-transient responses.
Load-Transient Considerations
The MAX1798/MAX1798A/MAX1799/MAX1799A load-
transient response graphs (see
Typical Operating
Characteristics
) show three components of the output
response: the output capacitor
’
s ESR spike, the regula-
tor
’
s transient settling response, and the DC shift due to
the LDO
’
s load regulation. Increasing the output capaci-
tor
’
s value and decreasing the ESR reduce the over-
shoot.
Dropout Voltage
A regulator
’
s minimum input-output voltage differential
(dropout voltage) determines the lowest usable supply
voltage. In battery-powered systems, this determines
the useful end-of-life battery voltage. Because the
MAX1798/MAX1798A/MAX1799/MAX1799A use P-
channel MOSFET pass transistors, their dropout volt-
age is a function of drain-to-source on-resistance
(R
DS(ON)
) multiplied by the load current. See the
Dropout Voltage (OUT1) vs. Load Current graph in the
Typical Operating Characteristics.
TRANSISTOR COUNT: 1735
Chip Information
Ordering Information (continued)
PA RT
TEMP
RANGE
PIN-
PA CKA GE
IN TER
FA CE
I
2
C
I
2
C
I
2
C
I
2
C
M A X17 99
E GP
M AX1799E U P
M A X17 99A
EGP
M AX1799AE UP
-40
°
C to +85
°
C
-40
°
C to +85
°
C
-40
°
C to +85
°
C
-40
°
C to +85
°
C
20 QFN
20 TS SOP EP
20 QFN
20 TS SOP EP
相關PDF資料 |
PDF描述 |
|---|---|
| MAX1799EGP | CDMA Cellular/PCS System Power Supplies |
| MAX1798EGP | Replaced by TMS320C6722B : Digital Signal Processor 144-QFP |
| MAX1798EUP | Replaced by TMS320C6722B : Digital Signal Processor 144-QFP |
| MAX1799AEUP | Replaced by TMS320C6727B : Digital Signal Processors 325-CPGA 0 to 70 |
| MAX1799EUP | Replaced by TMS320C6727B : Digital Signal Processors 325-CPGA |
相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX1798AEUP-T | 功能描述:PMIC 解決方案 CDMA Cellular/PCS System Power Supply RoHS:否 制造商:Texas Instruments 安裝風格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| MAX1798EGP | 功能描述:PMIC 解決方案 RoHS:否 制造商:Texas Instruments 安裝風格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| MAX1798EGP+ | 功能描述:PMIC 解決方案 CDMA Cellular/PCS System Power Supply RoHS:否 制造商:Texas Instruments 安裝風格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| MAX1798EGP+T | 功能描述:PMIC 解決方案 CDMA Cellular/PCS System Power Supply RoHS:否 制造商:Texas Instruments 安裝風格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| MAX1798EGP-T | 功能描述:PMIC 解決方案 RoHS:否 制造商:Texas Instruments 安裝風格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
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