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參數(shù)資料
| 型號： | MAX750AEPA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Retriggerable Monostable Multivibrators 16-CFP -55 to 125 |
| 中文描述： | 2 A SWITCHING REGULATOR, 210 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁數(shù)： | 7/16頁 |
| 文件大?。?/td> | 206K |
| 代理商： | MAX750AEPA |
M
Adjustable, S tep-Down,
Current-Mode PWM Regulators
_______________________________________________________________________________________
7
NAME
FUNCTION
1
SHDN
Shutdown—active low. Ground to power-down chip, tie to V+ for normal operation.
Output voltage falls to 0V when
SHDN
is low.
2
REF
3
SS
Soft-Start. Capacitor between SS and GND provides soft-start and short-circuit protec-
tion. 510k
resistor from SS to
SHDN
provides current boost.
2
3
4
CC
5
6
7
I.C.
GND
LX
Internal Connection. Make no external connection to this pin.
Ground*
Drain of internal P-channel power MOSFET*
7
8
9
8
V+
–
N.C.
No Connect—not internally connected.
10, 11
12, 13, 14
1, 15, 16
4, 5, 6
______________________________________________________________Pin Desc ription
PIN
8-PIN 16-PIN
DIP/SO WIDE SO
Reference Voltage Output (+1.22V) supplies up to 100μA for external loads. Bypass to
GND with a capacitor that does not exceed 0.047μF.
External voltage divider feedback point. When an external voltage divider is connected from
the output voltage to CC and GND, this pin becomes the feedback input for adjusting the
output voltage. Connect a 330pF compensation capacitor between the output and CC.
Supply Voltage Input. Bypass to GND with 1.0μF ceramic and large-value electrolytic capaci-
tors in parallel. The 1μF capacitor must be as close to the V+ and GND pins are possible.*
*16-Pin Wide SO: All pins with the same name must be connected together externally.
_______________Detailed Desc ription
The MAX750A/MAX758A switch-mode regulators use a
current-mode pulse-width-modulation (PWM) control
system coupled with a simple step-down (buck) regula-
tor topography. Input voltages range from 4V to 11V for
the MAX750A, and from 4V to 16V for the MAX758A.
The current-mode PWM architecture provides cycle-by-
cycle current limiting, improved load transient response
characteristics, and simpler outer-loop design.
The controller consists of two feedback loops: an inner
(current) loop that monitors the switch current via the
current-sense resistor and amplifier, and an outer (volt-
age) loop that monitors the output voltage through the
error amplifier (Figure 1). The inner loop performs
cycle-by-cycle current limiting, truncating the power-
transistor on-time when the switch current reaches a
predetermined threshold. This threshold is determined
by the outer loop. For example, a sagging output volt-
age produces an error signal that raises the threshold,
allowing the circuit to store and transfer more energy
during each cycle.
Programmable S oft-S tart
Figures 1 and 2 show a capacitor and a resistor connect-
ed to the soft-start (SS) pin to ensure an orderly power-
up. Typical values are 0.1μF and 510k
. SS controls
both the soft-start timing and the maximum output cur-
rent that can be delivered while maintaining regulation.
The charging capacitor slowly raises the clamp on the
error-amplifier output voltage, limiting surge currents at
power-up by slowly increasing the cycle-by-cycle current-
limit threshold. The 510k
resistor sets the soft-start
clamp at a value high enough to maintain regulation, even
at currents exceeding 1A. This resistor is not necessary
for lower current loads. Refer to the Maximum Output
Current vs. Supply Voltage, No. R1 graph in the Typical
Operating Characteristics Table 1 lists timing character-
istics for selected capacitor values and circuit conditions.
The overcurrent comparator trips if the load exceeds
approximately 1.5A. A soft-start cycle begins when
either an undervoltage or overcurrent fault condition
triggers an internal transistor to discharge the soft-
start capacitor to ground. A soft-start cycle also
begins at power-up and when coming out of the shut-
down mode.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX750AESA | 功能描述:直流/直流開關調節(jié)器 Adjustable PWM Step-Down Regulator RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| MAX750AESA+ | 功能描述:直流/直流開關調節(jié)器 Adjustable PWM Step-Down Regulator RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| MAX750AESA+T | 功能描述:直流/直流開關調節(jié)器 Adjustable PWM Step-Down Regulator RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| MAX750AESA-T | 功能描述:直流/直流開關調節(jié)器 Adjustable PWM Step-Down Regulator RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| MAX750AMJA | 功能描述:直流/直流開關調節(jié)器 RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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