参数资料
| 型号： | MAX8704EUB+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 10/13页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 1.5V/1.2V/ADJ 10-UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 稳压器拓扑结构： | 正，固定式或可调式 |
| 输出电压： | 1.5V，1.2V，可调式 |
| 输入电压： | 1 V ~ 5.5 V |
| 稳压器数量： | 1 |
| 电流 - 输出： | 5A |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-µMAX |
| 包装： | 管件 |
High-Current, Low-Voltage Linear Regulator
with Power-Limited, External MOSFET
1.0V, the MAX8704 folds back the current limit to
reduce the power dissipation across the external com-
1V
PLIM
V CC
ponents ( Figure 3). The power limit allows an output
short for an indefinite period of time without damaging
the MAX8704 or its external components.
Thermal-Overload Protection
Thermal-overload protection prevents the MAX8704
from overheating. When the junction temperature
exceeds +140 ° C, the linear regulator automatically
pulls PGOOD low and enters shutdown—the MAX8704
SS/EN
2V
CURRENT
LIMIT
TO CONTROL
BLOCK
pulls SS/EN low with an internal 1k ? pulldown resistor.
This disables the driver and discharges the output,
allowing the device to cool. Once the junction tempera-
ture cools by 20 ° C, the thermal protection circuit
releases the SS/EN input, allowing the MAX8704 to
automatically power up using the soft-start sequence. A
CSP
CSN
Figure 3. Current-Limit Functional Diagram
where the feedback threshold (V FB ) equals 0.5V, as
specified in the Electrical Characteristics table . The
minimum adjustable output voltage is 0.5V (FB = CSN).
The maximum adjustable output voltage is limited by
the gate driver’s output-voltage swing range (see the
Electrical Characteristics table ) and the gate threshold
of the selected n-channel MOSFET.
Fault Protection
Current Limit
The MAX8704 features a current limit ( Figure 3) that
monitors the voltage across the current-sense resistor,
typically limiting the CSP to CSN voltage to 50mV.
When the CSP to CSN voltage reaches the current-limit
threshold, the MAX8704 regulates the output current
rather than the output voltage. During startup, the soft-
start circuit ramps the current limit to reduce the input
surge current (see the Soft-Start Capacitor Selection
section).
continuous thermal-overload condition results in a
pulsed output.
Power-Good
The MAX8704 provides an open-drain PGOOD output
that goes high 3ms (typ) after the output initially reach-
es regulation. PGOOD transitions low immediately after
the output voltage drops below 92% (typ) of the nomi-
nal regulation voltage, or when the MAX8704 enters
shutdown. Connect a pullup resistor from PGOOD to
V CC for a logic-level output. Use a 100k ? resistor to
minimize current consumption.
Design Procedure
External MOSFET Selection
The external MOSFET selection depends on the gate
threshold voltage, input-to-output voltage, and package
power dissipation. The MAX8704 uses an external n-
channel MOSFET controlled by a 5V driver, so the max-
imum gate-to-source voltage across the MOSFET
(V GS(MAX) ) is equivalent to:
V GS(MAX) = V DRV(MAX) - V CSP
where the maximum drive voltage is approximately
V CC - 1V. The selected MOSFET’s on-resistance must
be low enough to support the minimum input-to-output
differential voltage (dropout voltage) and maximum
load required by the application:
MOSFET Power-Limit Protection
The MAX8704 includes a proprietary power-limit circuit
R DS ( ON )( MIN ) =
V IN(MIN) ? V CSLIMIT ? V OUT
I OUT ( MAX )
to protect the external n-channel MOSFET, especially
under short-circuit conditions. The MAX8704 uses an
internal multiplier circuit to generate an output current
(I PLIM ) that is directly proportional to the MOSFET
power dissipation. When the PLIM voltage exceeds
For output voltages less than 1.5V, standard MOSFETs
that provide on-resistance specifications with 2.5V
gate-to-source voltages are sufficient. For output volt-
ages greater than 1.5V, use low-threshold MOSFETs
10
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|---|---|
| MAX8704EUB+ | 功能描述:线性稳压器 - 标准 High current Low Voltage LDO RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
| MAX8704EUB+T | 功能描述:线性稳压器 - 标准 High current Low Voltage LDO RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
| MAX8704EUB-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 |
| MAX8704EVKIT | 功能描述:低压差稳压器 - LDO Evaluation Kit for the MAX8704 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 |
| MAX8705ETL | 制造商:Maxim Integrated Products 功能描述:IMVP-5 CPU CORE SUPPLY - Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
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