参数资料
| 型号： | MAX1819EBL33+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 7/9页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 3.3V/ADJ .5A 6-UCSP |
| 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： | 3.3V，1.25 V ~ 5 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| 电压 - 压降（标准）： | 0.133V @ 500mA，- |
| 稳压器数量： | 1 |
| 电流 - 输出： | 500mA（最小） |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-WFBGA，CSPBGA |
| 供应商设备封装： | 6-uCSP（1.57x1.16） |
| 包装： | 带卷 (TR) |
500mA Low-Dropout Linear Regulator in UCSP
R1 = R2
V OUT
1.25V
-1
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE
V IN = 2.5V TO 5.5V
C IN
1 μ F
IN
MAX1819
OUT
C OUT
3.3 μ F
R 1
V OUT
600
400
(POWER DISSIPATION LIMIT)
MAXIMUM RECOMMENDED T A = +85 ° C
OUTPUT CURRENT T A = +70 ° C
ON
SHDN
SET
OFF
R 2
200
V OUT = 1.8V
V OUT = 2.5V
V OUT = 3.3V
POK
GND
0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
INPUT VOLTAGE (V)
Figure 2. Adjustable Output Using External Feedback
Resistors
POK Output
The power-OK (POK) output pulls low when OUT is less
than 93% of the nominal regulation voltage. Once OUT
exceeds 93% of the nominal voltage, POK goes high
impedance. POK is an open-drain N-channel output. To
obtain a voltage signal, connect a pullup resistor from
POK to OUT. A 100k ? resistor works well for most appli-
cations. POK can be used as a power-OK signal to a
microcontroller (μC), or drive an external LED to indicate
power failure. When the MAX1819 is shut down, POK is
held low independent of the output voltage. If unused,
leave POK grounded or unconnected.
Current Limit
The MAX1819 monitors and controls the pass transis-
tor’s gate voltage, limiting the output current to 1.0A
(typ). This current limit doubles when the output voltage
is within 4% of the nominal value to improve perfor-
mance with large load transients.
Thermal Overload Protection
Thermal overload protection limits total power dissipa-
tion in the MAX1819. When the junction temperature
exceeds T J = +170°C, a thermal sensor turns off the
pass transistor, allowing the IC to cool. The thermal
sensor turns the pass transistor on again after the junc-
tion temperature cools by 20°C, resulting in a pulsed
output during continuous thermal overload conditions.
Thermal overload protection protects the MAX1819 in
the event of fault conditions. For continuous operation,
do not exceed the absolute maximum junction-temper-
ature rating of T J = +150°C.
Figure 3. Power Operating Regions—Maximum Output vs.
Supply Voltage
Operating Region and Power Dissipation
The MAX1819’s maximum power dissipation depends
on the thermal resistance of the IC package and circuit
board, the temperature difference between the die
junction and ambient air, and the rate of air flow. The
power dissipated in the device is P = I OUT × (V IN -
V OUT ). The maximum allowed power dissipation is
840mW at T A = +70°C or:
P MAX = (T J(MAX) - T A ) / ( θ JB + θ BA )
where T J - T A is the temperature difference between
the MAX1819 die junction and the surrounding air, θ JB
is the thermal resistance of the junction to the base,
and θ BA is the thermal resistance through the PC
board, copper traces, and other materials to the sur-
rounding air. For best heatsinking, the copper area
should be equally shared between the IN, OUT, and
GND pins.
The MAX1819 delivers up to 0.5A RMS and operates
with input voltages up to 5.5V, but not simultaneously.
High output currents can only be sustained when input-
output differential voltages are low, as shown in Figure 3.
_______________________________________________________________________________________
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| MAX1819EBL50+T | 功能描述:低压差稳压器 - LDO 500mA Low-Dropout Linear Regulator in UCSP 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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