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参数资料
| 型号： | MAX6795TPMD0+T |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | High-Voltage, Micropower, Single/Dual Linear Regulators with Supervisory Functions |
| 中文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, QCC20 |
| 封装： | 5 X 5 MM, 0.80 MM HEIGHT, LEAD FREE, MO-220WHHC, TQFN-20 |
| 文件页数： | 9/25页 |
| 文件大小： | 3529K |
| 代理商： | MAX6795TPMD0+T |
MAX6791–MAX6796
High-Voltage, Micropower, Single/Dual Linear
Regulators with Supervisory Functions
______________________________________________________________________________________
17
Applications Information
Output Voltage Selection
The MAX6791–MAX6796 feature dual-mode operation:
these devices operate in either a preset voltage mode
or an adjustable mode. In preset voltage mode, internal
trimmed feedback resistors set the internal linear regula-
tor to +1.8V, +2.5V, +3.3V, or +5V (see the Selector
Guide). Select preset voltage mode by connecting SET1
(MAX6791–MAX6794)/SET(MAX6795/MAX6796) to
GND. In adjustable mode, select an output voltage
between +1.8V and +11V using two external resistors
connected as a voltage-divider to SET1/SET (see Figure
1). Set the output voltage using the following equation:
where VSET = 1.2315V and R1, R2
≤ 200k.
Available Output-Current Calculation
The MAX6791–MAX6794 provide up to 150mA per out-
put, and the MAX6795/MAX6796 provide up to 300mA
of load current. Since the input voltage can be as high
as +72V, package power dissipation limits the amount
of output current available for a given input/output volt-
age and ambient temperature. Figure 2 shows the max-
imum power-dissipation curve for the MAX6791–
MAX6796. The graph assumes that the exposed metal
pad of the device package is soldered to a solid 1in2
section of PC board copper. Use Figure 2 to determine
the allowable package dissipation for a given ambient
temperature. Alternately, use the following formula to
calculate the allowable package dissipation:
PDMAX = Maximum Power Dissipation
PDMAX = 2.666W, for TA
≤ +70°C
PDMAX = [2.666W - 0.0333W x (TA - 70°C)], for +70°C
< TA
≤ +125°C
where 0.0333W is the MAX6791–MAX6796 package
thermal derating in W/°C and TA is the ambient temper-
ature in °C.
After determining the allowable package dissipation,
calculate the maximum output current using the follow-
ing formula:
PD = Power Dissipation
PD < PDMAX where PD = [(IN - OUT1) x IOUT1] + [(IN -
OUT2) x IOUT2], for MAX6791–MAX6794.
Also, IOUT1 should be
≤ 150mA and IOUT2 should be
≤ 150mA in any case.
PD < PDMAX where PD = [(IN - OUT) x IOUT], for
MAX6795/MAX6796.
Also, IOUT should be
≤ 300mA in any case.
Selecting Reset Timeout Period
The reset timeout period is adjustable to accommodate
a variety of P applications. Adjust the reset timeout
period by connecting a capacitor between CSRT and
GND. Use the following formula to set the reset timeout
period:
where tRP is in seconds and CCSRT is in Farads.
Connect CSRT to OUT1 (MAX6791–MAX6794) or to
OUT (MAX6795/MAX6796) to select an internally fixed
timeout period. Connect CSRT to GND to force RESET
low. CCSRT must be a low-leakage (< 10nA) type
capacitor. Ceramic capacitors are recommended; do
not use capacitors lower than 100pF to avoid the influ-
ence of parasitic capacitances.
tC
V
A
RP
CSRT
.
=×
1 218
10
6
VV
R
OUT
SET
=+
1
2
MAX6791–MAX6796
VIN
R1
R2
OUT1/OUT
SET1/SET
IN
GND
Figure 1. Setting the Output Voltage Using a Resistive-Divider
IOUT vs. (VIN - VOUT)
(VIN - VOUT) (V)
I OUT
(mA)
70 75
60
50
40
30
20
10
50
100
150
200
250
300
350
0
+70
°C
+85
°C
+125
°C
VOUT = 1.8V
SAFE OPERATION REGION FOR
EACH TEMPERATURE POINT IS
UNDER THE CURVE
Figure 2. Maximum Power Dissipation for MAX6791–MAX6796
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6795TPMD1+ | 功能描述:线性稳压器 - 标准 Single uPower Linear RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
| MAX6795TPMD1+T | 功能描述:线性稳压器 - 标准 Single uPower Linear RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
| MAX6795TPMD2+ | 功能描述:线性稳压器 - 标准 Single uPower Linear RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
| MAX6795TPMD2+T | 功能描述:线性稳压器 - 标准 Single uPower Linear RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
| MAX6795TPMD3+ | 功能描述:线性稳压器 - 标准 Single uPower Linear RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
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