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参数资料
| 型号： | REG102GA2.85/2K5G4 |
| 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, 0.27 V DROPOUT, PDSO6 |
| 封装： | GREEN, PLASTIC, SOT-223, 5 PIN |
| 文件页数： | 2/23页 |
| 文件大小： | 699K |
| 代理商： | REG102GA2.85/2K5G4 |
REG102
10
SBVS024F
www.ti.com
FIGURE 4. Block Diagram.
FIGURE 5. Output Noise versus Noise Reduction Capacitor.
0.1
100
1k
10
10k
110
100
90
80
70
60
50
40
30
20
Noise
Voltage
(Vrms)
C
NR (pF)
RMS NOISE VOLTAGE vs C
NR
REG102-5.0
REG102-3.3
REG102-2.5
C
OUT = 0F
10Hz < BW < 100kHz
Over-Current
Over Temp
Protection
V
REF
(1.26V)
Low-Noise
Charge Pump
DMOS
Output
R
1
NOTE: R
1 and R2 are internal
on fixed output versions.
V
OUT
Adj
(adjustable
versions)
R
2
NR
(fixed output
versions only)
Enable
REG102
V
IN
C
NR
(optional)
ENABLE
The Enable pin is active high and compatible with standard
TTL-CMOS levels. Inputs below 0.5V (max) turn the regula-
tor off and all circuitry is disabled. Under this condition,
ground pin current drops to approximately 10nA. When not
used, the Enable pin can be connected to VIN. When a pull-
up resistor is used, and operation below 1.8V is required, use
pull-up resistor values below 50k
.
OUTPUT NOISE
A precision bandgap reference is used to generate the
internal reference voltage, VREF. This reference is the domi-
nant noise source within the REG102 and generates approxi-
mately 29
Vrms in the 10Hz to 100kHz bandwidth at the
reference output. The regulator control loop gains up the
reference noise, so that the noise voltage of the regulator is
approximately given by:
V
Vrms
RR
R
Vrms
V
N
OUT
REF
=
+
=
29
2
29
12
(1)
As the value of VREF is 1.26V, this relationship reduces to:
V
Vrms
V
N
OUT
=
23
(2)
Connecting a capacitor, CNR, from the Noise Reduction (NR)
pin to ground forms a low-pass filter for the voltage refer-
ence. Adding CNR (as shown in Figure 4) forms a low-pass
filter for the voltage reference. For CNR = 10nF, the total noise
in the 10Hz to 100kHz bandwidth is reduced by approxi-
mately a factor of 2.8 for VOUT = 3.3V. This noise reduction
effect is shown in Figure 5 and as
RMS Noise Voltage vs CNR
in the Typical Characteristics section.
Noise can be further reduced by carefully choosing an output
capacitor, COUT. Best overall noise performance is achieved
with very low (< 0.22
F) or very high (> 2.2F) values of C
OUT
(see the
RMS Noise Voltage vs COUT typical characteristic).
The REG102 uses an internal charge pump to develop an
internal supply voltage sufficient to drive the gate of the
DMOS pass element above VIN. The charge-pump switching
noise (nominal switching frequency = 2MHz) is not measur-
able at the output of the regulator over most values of IOUT
and COUT.
The REG102 adjustable version does not have the noise-
reduction pin available; however, the adjust pin is the sum-
ming junction of the error amplifier. A capacitor, CFB, con-
nected from the output to the adjust pin can reduce both the
output noise and the peak error from a load transient (see the
typical characteristics for output noise performance).
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相关代理商/技术参数 |
参数描述 |
|---|---|
| REG102GA-3 | 功能描述:低压差稳压器 - LDO DMOS 250 mA LDO Reg 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 |
| REG102GA-3.3 | 功能描述:低压差稳压器 - LDO DMOS 250 mA LDO Reg 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 |
| REG102GA-3.3/2K5 | 功能描述:低压差稳压器 - LDO DMOS 250 mA LDO Reg 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 |
| REG102GA-3.3/2K5G4 | 功能描述:低压差稳压器 - LDO DMOS 250 mA LDO Reg 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 |
| REG102GA-3.3G4 | 功能描述:低压差稳压器 - LDO DMOS 250 mA LDO Reg 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 |
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