- 您现在的位置：买卖IC网 > PDF目录19799 > MAX8869EUE18+T (Maxim Integrated)IC REG LDO 1.8V/ADJ 1A 16-TSSOP PDF资料下载
参数资料
| 型号： | MAX8869EUE18+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 8/11页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 1.8V/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： | 1.8V，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
MAX8869
MAX8869
IN
OUT
IN
OUT
V IN
C IN
1 μ F
IN
IN
IN
OUT
OUT
OUT
R1
C OUT
1 μ F
V OUT
V IN
C IN
1 μ F
IN
IN
IN
OUT
OUT
OUT
C OUT
1 μ F
V OUT
ON
OFF
SHDN
RST
RESET
OUTPUT
ON
OFF
SHDN
RST
RESET
OUTPUT
SS
GND
SET
C SS
R SS
SS
SET
GND
R2
Figure 3. Typical Operating Circuit with Adjustable Output
Voltage
below its nominal output voltage. RST remains low for
3ms after OUT has returned to its nominal value. A
100k ? pullup resistor from RST to a suitable logic sup-
ply voltage (typically OUT) provides a logic control sig-
nal. RST can be used as a power-on-reset signal to a
microcontroller (μC) or can drive an external LED for
indicating a power failure. RST is low during shutdown.
RST remains valid for an input voltage as low as 1V.
Soft-Start
As shown in Figure 4, a capacitor on SS allows a grad-
ual buildup of the MAX8869 output, reducing the initial
in-rush current peaks at startup. When SHDN is driven
low, the soft-start capacitor is discharged. When SHDN
is driven high or power is applied to the device, a con-
stant 6μA current charges the soft-start capacitor. The
resulting linear ramp voltage on SS increases the cur-
rent-limit comparator threshold, limiting the P-channel
gate drive (see Soft-Start Capacitor Selection). Leave
SS unconnected to disable the soft-start feature.
Current Limiting
The MAX8869 features a 4A current limit when the out-
put voltage is in regulation. When the output voltage
drops by 8% below its nominal, the current limit folds
back to 1.7A. The output can be shorted to ground for
an indefinite period of time without damaging the
device. Avoid continuous output current of more than
1A to prevent damage.
Both the in-regulation and short-circuit current limits can
be reduced from their nominal values by reducing the
voltage at the soft-start input (SS) below 1.25V. The cur-
rent limits scale proportionately with the voltage by I LIM
= I LIM_NOM (V SS / 1.25). Since the SS input sources a
nominal 6μA current, the current limit can be set by
8
Figure 4. Typical Operating Circuit with Soft-Start and Current-
Limit Reduction
tying a resistor (R SS ) between SS and GND, so that I LIM
= I LIM_NOM (I SS R SS / 1.25) where I SS = 6μA . With
R SS in place, soft-start can still be achieved by placing
a capacitor (C SS ) in parallel with R SS . The output current
now ramps up asymptotically to the reduced current
limit rather than the nominal one, increasing the soft-
start time. The time required for the current limit to reach
90% of its steady-state value is given by t SS = 2.3
R SS C SS .
Thermal Overload Protection
Thermal overload protection limits total power dissipa-
tion in the MAX8869. When the junction temperature
exceeds T J = +170°C, the thermal sensor turns off the
pass transistor, allowing the IC to cool. The thermal sen-
sor turns the pass transistor on once the IC’s junction
temperature drops approximately 20°C. Continuous
short-circuit conditions will consequently result in a
pulsed output.
Thermal overload protection is designed to safeguard
the MAX8869 in the event of fault conditions. For con-
tinuous operation, do not exceed the absolute maxi-
mum junction temperature rating of T J = +150°C.
Operating Region and Power Dissipation
Maximum power dissipation of the MAX8869 depends
on the thermal resistance of the case and circuit board,
the temperature difference between the die junction
and ambient air, and the rate of air flow. The power dis-
sipation across the device is P = I OUT (V IN - V OUT ). The
resulting maximum power dissipation is:
P MAX = [(T J(MAX) - T A ) / ( θ JC + θ CA )]
where (T J(MAX) - T A ) is the temperature difference
between the maximum allowed die junction (150°C)
and the surrounding air; θ JC (junction to case) is the
Maxim Integrated
相关PDF资料 |
PDF描述 |
|---|---|
| EMM44DRTS | CONN EDGECARD 88POS DIP .156 SLD |
| MIC2589R-1YM | IC CTRLR HOT SWAP NEG HV 14-SOIC |
| VI-B7Y-CY-F1 | CONVERTER MOD DC/DC 3.3V 33W |
| EMM44DSUN | CONN EDGECARD 88POS DIP .156 SLD |
| HIP1012ACBZA | IC CTRLRL HOT PLUG DUAL 14-SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8869EUE25 | 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 |
| MAX8869EUE25+ | 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 |
| MAX8869EUE25+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 |
| MAX8869EUE25-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 |
| 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 |
发布紧急采购，3分钟左右您将得到回复。