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| 型号： | TPS793285DBVRQ1 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 固定正电压单路输出LDO稳压器 |
| 英文描述： | 2.85 V FIXED POSITIVE LDO REGULATOR, 0.2 V DROPOUT, PDSO5 |
| 封装： | PLASTIC, SOT-23, 5 PIN |
| 文件页数： | 3/16页 |
| 文件大小： | 356K |
| 代理商： | TPS793285DBVRQ1 |
TPS79301Q1,'79318Q1, '79325Q1
'79328Q1,'793285Q1,'79330Q1
TPS79333Q1,'793475Q1
SGLS162B APRIL 2003 REVISED JUNE 2005
www.ti.com
11
APPLICATION INFORMATION
POWER DISSIPATION AND JUNCTION TEMPERATURE
Specified regulator operation is assured to a junction temperature of 125
°C; the maximum junction temperature should be
restricted to 125
°C under normal operating conditions. This restriction limits the power dissipation the regulator can handle
in any given application. To ensure the junction temperature is within acceptable limits, calculate the maximum allowable
dissipation, PD(max), and the actual dissipation, PD, which must be less than or equal to PD(max).
The maximum-power-dissipation limit is determined using the following equation:
P
D(max) +
T
J
max
* T
A
RθJA
Where:
TJmax is the maximum allowable junction temperature.
RθJA is the thermal resistance junction-to-ambient for the package, see the dissipation rating table.
TA is the ambient temperature.
(1)
The regulator dissipation is calculated using:
P
D +
V
I *
V
O
I
O
(2)
Power dissipation resulting from quiescent current is negligible. Excessive power dissipation triggers the thermal protection
circuit.
PROGRAMMING THE TPS79301 ADJUSTABLE LDO REGULATOR
The output voltage of the TPS79301 adjustable regulator is programmed using an external resistor divider as shown in
Figure 23. The output voltage is calculated using:
V
O +
V
ref
1
) R1
R2
(3)
Where:
Vref = 1.2246 V typ (the internal reference voltage)
PROGRAMMING THE TPS79301 ADJUSTABLE LDO REGULATOR (CONTINUED)
Resistors R1 and R2 should be chosen for approximately 50-
A divider current. Lower value resistors can be used for
improved noise performance, but the solution consumes more power. Higher resistor values should be avoided as leakage
current into/out of FB across R1/R2 creates an offset voltage that artificially increases/decreases the feedback voltage and
thus erroneously decreases/increases VO. The recommended design procedure is to choose R2 = 30.1 k to set the
divider current at 50
A, C1 = 15 pF for stability, and then calculate R1 using:
R1
+
V
O
V
ref
* 1
R2
(4)
In order to improve the stability of the adjustable version, it is suggested that a small compensation capacitor be placed
between OUT and FB. For voltages <1.8 V, the value of this capacitor should be 100 pF. For voltages >1.8 V, the
approximate value of this capacitor can be calculated as:
C1
+
(3 x 10–7)x(R1
) R2)
(R1 x R2)
(5)
The suggested value of this capacitor for several resistor ratios is shown in the table below. If this capacitor is not used
(such as in a unity-gain configuration) or if an output voltage <1.8 V is chosen, then the minimum recommended output
capacitor is 4.7
F instead of 2.2 F.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS793285DBVT | 功能描述:低压差稳压器 - LDO High PSRR Fast RF High-Enable 200mA RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| TPS793285DBVTG4 | 功能描述:低压差稳压器 - LDO High PSRR Fast RF High-Enable 200mA RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| TPS793285QDBVRQ1 | 功能描述:低压差稳压器 - LDO Ultra Lo Noise Hi PSRR Fast RF 200mA RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| TPS793285QDBVRSV | 制造商:Texas Instruments 功能描述: |
| TPS793285YEQEVM | 功能描述:电源管理IC开发工具 TPS793285YEQ Eval Mod RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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