参数资料
| 型号： | MAX8704EUB+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 7/13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
Pin Description
PIN
1
2
3
4
5
6
7
8
9
10
NAME
V IN
V CC
PGOOD
PLIM
SS/EN
FB
CSN
CSP
GND
DRV
FUNCTION
Input Voltage Sense. The MAX8704 senses the voltage across the external MOSFET (V IN - V CSN ) to
determine the MOSFET’s power dissipation.
Analog and Driver Supply Input. Connect to the system supply voltage (+5.0V). Bypass V CC to
analog ground with a 1μF or greater ceramic capacitor.
Open-Drain Power-Good Output. PGOOD is low when the output voltage is more than 8% (typ) below
the nominal regulation voltage. PGOOD is also pulled low during soft-start and in shutdown.
Approximately 3ms (typ) after the LDO reaches the regulation voltage, PGOOD becomes high
impedance as long as the output remains in regulation.
Power-Limit Adjustment. The PLIM output sources a current directly proportional to the MOSFET’s
power dissipation. If the PLIM voltage exceeds the 1.0V power-limit threshold, the regulator reduces
the power dissipation by folding back the current limit. An external resistor between PLIM and GND
sets the maximum MOSFET’s power dissipation. Additionally, an external capacitor filters the PLIM
voltage, allowing short high-power transients to occur periodically.
Soft-Start and Enable Input. Connect SS/EN to an open-drain output. When SS/EN is pulled low, the
linear regulator shuts down and pulls the output to ground. Connect a soft-start capacitor from SS/EN
to GND to slowly ramp up the current limit during startup (see the Soft-Start and Enable section).
Feedback Input. Connect FB to V CC for a fixed 1.5V output, or connect FB to GND for a fixed 1.2V
output. For an adjustable output, connect FB to a resistive divider from the output voltage. The FB
regulation level is 0.5V.
Negative Current-Sense Input and Output Sense Input. Connect to the negative terminal of the
current-sense element as shown in Figure 1. CSN serves as the feedback input in fixed-voltage mode
(FB = GND or V CC ). When the MAX8704 is disabled, the output is discharged through a 10 ? resistor
to GND.
Positive Current-Sense Input. Connect to the positive terminal of the current-sense element as shown
in Figure 1. The MAX8704 driver reduces the gate voltage when the current-limit threshold is
exceeded.
Ground
Gate Drive for the External n-Channel MOSFET
Detailed Description
The MAX8704 is a low-dropout, external n-channel
MOSFET linear regulator for low-voltage notebook
power supplies. The regulator uses two separate sup-
plies—the notebook’s 5V bias supply (V CC ) for driving
the external n-channel MOSFET, and the lowest system
supply available for the power input (V IN ). By using
separate bias and power inputs, the MAX8704 maxi-
mizes the gate drive while minimizing the power loss.
The regulator provides an accurate (-2% typ load regu-
lation) output that delivers up to 5A for powering the
low-voltage (1.0V, 1.2V, 1.5V, and 1.8V) supplies
required by notebook chipsets.
Figure 1 shows the standard application circuit, and
Figure 2 shows the functional diagram. The MAX8704
standard application circuit delivers up to 5A and oper-
ates with input voltages up to 5.5V, but not simultane-
ously. Continuous high output currents can only be
achieved when the input-to-output differential voltage is
low (Figure 1).
5.0V Bias Supply (V CC )
The V CC input powers the control circuitry and provides
the gate drive to the external n-channel MOSFET. This
improves efficiency by allowing V IN to be powered from
a low-voltage system supply. Power V CC from a well-
regulated 5V supply. Current drawn from the V CC sup-
ply remains relatively constant with variations in V IN and
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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