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參數(shù)資料
| 型號： | MAX1598EZK48-T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 固定正電壓單路輸出LDO穩(wěn)壓器 |
| 英文描述： | 4.8 V FIXED POSITIVE LDO REGULATOR, 0.12 V DROPOUT, PDSO5 |
| 封裝： | THIN, SOT-23, 5 PIN |
| 文件頁數(shù)： | 7/9頁 |
| 文件大小： | 363K |
| 代理商： | MAX1598EZK48-T |
Output Voltage
The MAX1598 is supplied with factory-set output voltages
from 2.5V to 5V in 100mV increments. Except for the
MAX1598EZK29 and the MAX1598EZK32 (which have an
output voltage preset at 2.84V and 3.15V, respectively),
the two-digit suffix allows the customer to choose the out-
put voltage in 100mV increments. For example, the
MAX1598EZK33 has a preset output voltage of 3.3V (see
the Selector Guide).
Internal P-Channel Pass Transistor
The MAX1598 features a 1.1
typical P-channel MOSFET
pass transistor. This provides several advantages over
similar designs using PNP pass transistors, including
longer battery life. The P-channel MOSFET requires no
base drive, which reduces quiescent current consider-
ably. PNP-based regulators waste considerable current in
dropout when the pass transistor saturates. They also use
high base-drive currents under large loads. The
MAX1598 does not suffer these problems and consumes
only 100A of quiescent current whether in dropout, light-
load, or heavy-load applications (see the Typical
Operating Characteristics).
Current Limit
The MAX1598 includes a current limiter, which monitors
and controls the pass transistor’s gate voltage, limiting the
output current to 458mA. For design purposes, consider
the current limit to be 220mA minimum to 1.1A maximum.
The output can be shorted to ground indefinitely without
damaging the part.
Thermal-Overload Protection
Thermal-overload protection limits total power dissipa-
tion in the MAX1598. When the junction temperature
exceeds TJ = +155°C, the thermal sensor signals the
shutdown logic, turning off the pass transistor and
allowing the IC to cool. The thermal sensor turns the
pass transistor on again after the IC’s junction tempera-
ture cools by 15°C, resulting in a pulsed output during
continuous thermal-overload conditions.
Thermal-overload protection is designed to protect the
MAX1598 in the event of fault conditions. For continual
operation, do not exceed the absolute maximum junc-
tion-temperature rating of TJ = +150°C.
Operating Region and Power Dissipation
The MAX1598 maximum power dissipation 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 dissipation
across the device is P = IOUT (VIN - VOUT). The maximum
power dissipation is:
PMAX = (TJ - TA) / (
θJB + θBA)
where TJ - TA is the temperature difference between the
MAX1598 die junction and the surrounding air,
θJB (or
θJC) is the thermal resistance of the package, and θBA
is the thermal resistance through the PC board, copper
traces, and other materials to the surrounding air.
The GND pin of the MAX1598 performs the dual func-
tions of providing an electrical connection to ground
and channeling heat away. Connect the GND pin to
ground using a large pad or ground plane.
Reverse Battery Protection
The MAX1598 has a unique protection scheme that limits
the reverse supply current to 1mA when either VIN or
V SHDN falls below ground. Their circuitry monitors the
polarity of these two pins and disconnects the internal
circuitry and parasitic diodes when the battery is
reversed. This feature prevents device damage.
Noise Reduction
An external 0.01F bypass capacitor at BP, in conjunc-
tion with an internal 200k
resistor, creates an 80Hz
lowpass filter for noise reduction. The MAX1598 exhibits
30VRMS of output voltage noise with CBP = 0.01F and
COUT = 10F. This is negligible in most applications.
Startup time is minimized by a power-on circuit that pre-
charges the bypass capacitor. The Typical Operating
Characteristics section shows graphs of Noise vs. BP
Capacitance, Noise vs. Load Current, and Output Noise
Spectral Density.
____________Applications Information
Capacitor Selection and
Regulator Stability
Under normal conditions, use a 1F capacitor on the
MAX1598 input and a 2.2F to 10F capacitor on the out-
put. Larger input capacitor values and lower ESRs pro-
vide better supply-noise rejection and line-transient
response. Reduce noise and improve load-transient
response, stability, and power-supply rejection by using
large output capacitors. For stable operation over the full
temperature range and with load currents up to 200mA, a
2.2F (min) ceramic capacitor is recommended.
Note that some ceramic dielectrics exhibit large capaci-
tance and ESR variation with temperature. With
dielectrics such as Z5U and Y5V, it may be necessary to
increase the capacitance by a factor of 2 or more to
ensure stability at temperatures below -10°C. With X7R or
X5R dielectrics, 2.2F should be sufficient at all operating
temperatures. A graph of the Region of Stable COUT ESR
vs. Load Current is shown in the Typical Operating
Characteristics.
MAX1598
Low-Noise, Low-Dropout, 200mA
Linear Regulator
_______________________________________________________________________________________
7
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1598EZK4A | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1598EZK4A-T | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1598EZK50 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1598EZK50+T | 功能描述:低壓差穩(wěn)壓器 - LDO Integrated Circuits (ICs) 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 |
| MAX1598EZK50-T | 功能描述:低壓差穩(wěn)壓器 - LDO 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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