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參數(shù)資料
| 型號(hào)： | MAX729CCK |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | Octal Buffers And Line Drivers With 3-State Outputs 20-LCCC -55 to 125 |
| 中文描述： | 3.2 A SWITCHING REGULATOR, 120 kHz SWITCHING FREQ-MAX, PZFM5 |
| 封裝： | TO-220, 5 PIN |
| 文件頁(yè)數(shù)： | 3/4頁(yè) |
| 文件大小： | 39K |
| 代理商： | MAX729CCK |
M
5V /3.3V /3V 2A S tep-Down, PWM,
S witc h-Mode DC-DC Regulators
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 25V, T
j
= T
MIN
to T
MAX
, unless otherwise noted.)
_______________________________________________________________________________________
3
Note 1:
Do not exceed switch-to-input voltage limitation.
Note 2:
For switch currents between 1A and 2A, maximum switch-on voltage can be calculated via linear interpolation.
Note 3:
By setting the SENSE pin to 5.5V, the V
C
pin is forced to its low clamp level and the switch duty cycle is forced to zero,
approximating the zero load condition.
Note 4:
For proper regulation, total voltage from V
to GND must be
≥
8V after start-up.
Note 5:
To avoid extremely short switch-on times, the switch frequency is internally scaled down when V
is less than 2.6V
(MAX727), 2.0V (MAX728), or 1.8V (MAX729). Switch current limit is tested with V
SENSE
adjusted to give a 1μs minimum
switch-on time.
Note 6:
Guaranteed, not production tested.
0% duty cycle
0% duty cycle
V
C
Voltage Temperature Coefficient
Thermal Resistance J unction to Case
(Note 6)
mV/°C
°C/W
4.0
V
-4
T
j
= T
MIN
to T
MAX
V
C
Voltage
1.5
T
j
= +25°C
Output Voltage Line Regulation
%/V
0.005
0.020
8V
≤
V
IN
≤
40V
±1.0
±3.0
T
j
= T
MIN
to
T
MAX
V
OUT
(nominal) = 5V (MAX727),
3.3V (MAX728), or 3V (MAX729);
all conditions of input voltage,
output voltage, and load
current
Output Voltage Tolerance
%
±0.5
±2.0
T
j
= +25°C
MAX729
MAX728
MAX727
MAX729
MAX728
MAX727
CONDITIONS
2.2
3.8
6.5
T
j
= +25°C
SENSE Pin Divider Resistance
2.5
4.2
7.0
k
3.0
5.0
8.0
2.90
3.00
3.10
V
C
= 2V
SENSE Voltage
3.20
3.30
3.40
V
4.85
5.00
5.15
UNITS
MIN
TYP
MAX
PARAMETER
______________________________________________________________Pin Desc ription
5
V
supplies power to the internal circuitry and also connects to the collector of the internal power
switch. V
IN
must be bypassed with a low-ESR capacitor, typically 200μF or 220μF.
Internal Power Switch Output. The
S
witch output can swing 35V below ground and is rated for 2A.
Ground requires a short, low-noise connection to ensure good load regulation. The internal refer-
ence is referred to GND, so errors at this pin are multiplied by the error amplifier.
Error-Amplifier Output. A series RC network connected to this pin compensates the
MAX727/MAX728/MAX729. Output swing is limited to about 5.8V in the positive direction and
-0.7V in the negative direction. V
can also synchronize the MAX727/MAX728/MAX729 to an
external TTL clock in the 115kHz to 170kHz range. See MAX724/MAX726 data sheet.
SENSE Input is the internal error amplifier's input, and should be directly connected to V
OUT
.
SENSE also aids current limiting by reducing oscillator frequency when V
OUT
is low.
4
3
2
1
PIN
V
IN
V
SW
GND
V
C
SENSE
FUNCTION
NAME
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX729ECK | Octal Buffers And Line Drivers With 3-State Outputs 20-CDIP -55 to 125 |
| MAX727 | 5V/3.3V/3V 2A Step-Down, PWM, Switch-Mode DC-DC Regulators(2A,5V,步降,PWM,開(kāi)關(guān)型DC-DC變換器) |
| MAX728 | 5V/3.3V/3V 2A Step-Down, PWM, Switch-Mode DC-DC Regulators(2A,5V,步降,PWM,開(kāi)關(guān)型DC-DC變換器) |
| MAX729 | 5V/3.3V/3V 2A Step-Down, PWM, Switch-Mode DC-DC Regulators(2A,5V,步降,PWM,開(kāi)關(guān)型DC-DC變換器) |
| MAX7300 | 2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port I/O Expander |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX729CCM | 制造商:MAXIM 制造商全稱(chēng):Maxim Integrated Products 功能描述:Voltage-Mode SMPS Controller |
| MAX729CKS | 制造商:MAXIM 制造商全稱(chēng):Maxim Integrated Products 功能描述:Voltage-Mode SMPS Controller |
| MAX729CWE | 制造商:MAXIM 制造商全稱(chēng):Maxim Integrated Products 功能描述:Voltage-Mode SMPS Controller |
| MAX729ECK | 制造商:MAXIM 制造商全稱(chēng):Maxim Integrated Products 功能描述:5V/3.3V/3V 2A Step-Down, PWM, Switch-Mode DC-DC Regulators |
| MAX729ECM | 制造商:MAXIM 制造商全稱(chēng):Maxim Integrated Products 功能描述:Voltage-Mode SMPS Controller |
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