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| 型号： | MAX8869EUE25+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/11页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 2.5V/ADJ 1A 16-TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 稳压器拓扑结构： | 正，固定式或可调式 |
| 输出电压： | 2.5V，0.8 V ~ 5 V |
| 输入电压： | 2.7 V ~ 5.5 V |
| 稳压器数量： | 1 |
| 电流 - 输出： | 1A（最小） |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 供应商设备封装： | 16-TSSOP-EP |
| 包装： | 带卷 (TR) |
MAX8869
1A, Microcap, Low-Dropout,
Linear Regulator
1.2
1.0
0.8
0.6
0.4
0.2
MAXIMUM CONTINUOUS CURRENT
T A = +25 ° C
T A = +50 ° C
T A = +70 ° C
T J = +150 ° C
SRF and ESR of 60m ? or less to ensure stability and
optimum transient response. This is particularly true in
applications with very low output voltage (<2V) and high
output current (>0.5A).
Since some capacitor dielectrics may vary over bias
voltage and temperature, consult the capacitor manu-
facturer specifications to ensure that the capacitors
meet these requirements over all voltage and tempera-
ture conditions used.
Soft-Start Capacitor Selection
A capacitor (C SS ) connected from SS to GND causes
0
0
1 2 3 4
INPUT-OUTPUT DIFFERENTIAL VOLTAGE
5
the MAX8869 output current to slowly rise during start-
up, reducing stress on the input supply. The rise time to
full current limit (t SS ) is determined by:
Figure 5. Power Operating Region: Maximum Output Current
vs. Input-Output Differential Voltage
thermal resistance of the package chosen, and θ CA is
the thermal resistance from the case through the PC
board, copper traces, and other materials to the sur-
rounding air. Figure 5 shows the allowable power dissi-
pation for typical PC boards at +25°C, +50°C, and
+70°C ambient temperatures.
The MAX8869 TSSOP-EP package features an
exposed thermal pad on its underside. This pad lowers
the package’s thermal resistance by providing a direct
thermal heat path from the die to the PC board.
Additionally, GND also channels heat. Connect the
exposed thermal pad and GND to circuit ground by
using a large pad (1in 2 minimum recommended) or
multiple vias to the ground plane.
Applications Information
Capacitor Selection and
Regulator Stability
Capacitors are required at the MAX8869 input and out-
put. Connect 1μF or greater capacitors between IN and
GND (C IN ) and OUT and GND (C OUT ). Due to the
MAX8869’s relatively high bandwidth, use only surface-
mount ceramic capacitors that have low equivalent
series resistance (ESR) and high self-resonant frequen-
cy (SRF). Make the input and output traces at least
2.5mm wide (the width of the four parallel inputs and
outputs), and connect C IN and C OUT within 6mm of the
IC to minimize the impact of PC board trace induc-
tance. The width of the ground trace should be maxi-
mized underneath the IC to ensure a good connection
between GND and the ground side of the capacitors.
The output capacitor’s ESR and SRF can affect stability
and output noise. Use capacitors with greater than 5MHz
Maxim Integrated
t SS = 2.08 10 -4 C SS
where C SS is in nF. Typical capacitor values between
10nF to 100nF, with a 5V rating, are sufficient.
Because this ramp is applied to the current-limit com-
parator, the actual time for the output voltage to ramp
up depends on the load current and output capacitor.
Leave SS open to disable soft-start.
Input-Output (Dropout) Voltage
A regulator’s minimum input-to-output voltage differen-
tial (dropout voltage) determines the lowest usable sup-
ply voltage. In battery-powered systems, this
determines the useful end-of-life battery voltage. Since
a 0.2 ? P-channel MOSFET is used as the pass device,
dropout voltage is the product of R DS(ON ) and load
current (see Electrical Characteristics and Dropout
Voltage vs. Output Current in Typical Operating
Characteristics ). The MAX8869 operating current
remains low in dropout.
Noise, PSRR, and Transient Response
The MAX8869 is designed to achieve low dropout volt-
age and low quiescent current in battery-powered sys-
tems while still maintaining good noise, transient
response, and AC rejection (see PSRR vs. Frequency
in the Typical Operating Characteristics). When operat-
ing from very noisy sources, supply noise rejection and
transient response can be improved by increasing the
values of the input and output capacitors and employ-
ing passive postfiltering. MAX8869 output noise is typi-
cally 150μV RMS. (see the Output Noise plot in the
Typical Operating Characteristics).
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8869EUE33 | 功能描述:低压差稳压器 - LDO 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 |
| MAX8869EUE33+ | 功能描述:低压差稳压器 - LDO 1A MicroCap Linear Regulator 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 |
| MAX8869EUE33+ | 制造商:Maxim Integrated Products 功能描述:IC V REG LDO 3.3V SMD TSSOP16 |
| MAX8869EUE33+T | 功能描述:低压差稳压器 - LDO 1A MicroCap Linear Regulator 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 |
| MAX8869EUE33-T | 功能描述:低压差稳压器 - LDO 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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