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| 型号： | MAX1702BETX+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/19页 |
| 文件大小： | 0K |
| 描述： | IC PWR MNG TRPL OUT 36-TQFN |
| 标准包装： | 50 |
| 应用： | 处理器 |
| 电源电压： | 2.6 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 36-WFQFN 裸露焊盘 |
| 供应商设备封装： | 36-TQFN 裸露焊盘（6x6） |
| 包装： | 管件 |
Triple-Output Power-Management IC for
Microprocessor-Based Systems
R 4 = R 5 ? OUT ? 1 ?
high-side P-channel MOSFET turns on, and the con-
troller enters a low-current consumption mode. The
device remains in this mode until the MAX1702B is no
longer in dropout.
Synchronous Rectification
An N-channel synchronous rectifier eliminates the need
for an external Schottky diode and improves efficiency.
The synchronous rectifier turns on during the second
half of each cycle (off-time). During this time, the volt-
age across the inductor is reversed, and the inductor
current falls. The synchronous rectifier is turned off at
the end of the cycle (at which time another on-time
begins) or when the inductor current approaches zero.
Battery Monitoring and
Undervoltage Lockout
The MAX1702B does not operate with input voltages
below the undervoltage lockout (UVLO) threshold of
2.35V (typ). The inputs remain high impedance until the
supply voltage exceeds the UVLO threshold, reducing
battery load under this condition.
The MAX1702B provides a low-battery comparator that
compares the voltage on LBI to the reference voltage.
An open-drain output ( LBO ) goes low when the LBI volt-
age is below 1V. Use a resistive voltage-divider network
as shown in Figure 1 to set the trip voltage to the desired
level. LBO is high impedance in shutdown mode.
The MAX1702B also provides a dead-battery compara-
tor that turns off the IC when the battery has excessive-
ly discharged. When the voltage at DBI is below the
1.235V threshold, the MAX1702B is turned off and
draws only 5μA from the battery. Use a resistive volt-
age-divider network as shown in Figure 1 to set the trip
voltage to the desired level.
Power-On Sequencing
The MAX1702B starts when the input voltage rises
above the UVLO threshold and the voltage at DBI is
greater than the DBI threshold. When power is initially
applied, REG1 starts in soft-start mode. Once OUT1
reaches its regulation voltage, REG3 ramps to its target
in soft-start mode. Finally, once OUT3 reaches its regu-
lation voltage, REG2 ramps to its target in soft-start
mode. The RSO output holds low during this time and
remains low until 65.5ms after REG2 reaches its target
output voltage.
Once all the regulators are running, ON2 turns REG2 on
and off. During startup (before the end of the reset peri-
od) REG2 is enabled and can only be turned off once
the RSO output goes high. When turned off, the REG2
output voltage is discharged to PG2 through LX2.
REG1 and REG3 Step-Down Converters
REG1 and REG3 are 1MHz PWM, current-mode step-
down converters and generate 3.3V at up to 900mA
(REG1), and 3.3V, 2.5V, or 1.8V at up to 800mA
(REG3). Internal switches and synchronous rectifiers
are integrated for small size and improved efficiency.
Both regulators remain on while the input voltage is
above the UVLO threshold and DBI is above the DBI
threshold. REG1 and REG3 cannot be independently
turned on or off. To turn both regulators off, pull DBI
below the DBI threshold (1.235V typ).
The REG3 output voltage is set through the PGM3 pin.
Connect PGM3 to IN to set the output voltage to 3.3V,
connect it to REF to set it to 2.5V, and connect it to
GND to set the voltage to 1.8V.
REG2 Step-Down Converter
REG2 is a 1MHz, current-mode step-down converter
and generates a 0.7V to V IN output delivering up to
400mA. An internal switch and synchronous rectifier
are used for small size and improved efficiency. REG2
is turned on and off through the ON2 input. Drive ON2
low to turn off the regulator, and high to turn it on.
OUTOK goes low when the REG2 output voltage drops
below 92.5% of the regulation voltage. OUTOK is an
open-drain output. OUTOK can be used to signal the
processor that the REG2 voltage is in, allowing the
processor to exit from sleep mode into run mode.
Reset Output
MAX1702B features an active-low, open-drain reset out-
put ( RSO ), RSO holds low during startup or when the
manual reset input MR is held low. RSO goes high
impedance 65.5ms after REG2 reaches its target value
and the MR input goes high. (see the Power-On
Sequencing section). Note that RSO remains high when
REG2 is turned off.
Applications Information
Setting the Output Voltages
The REG1 output voltage is fixed at 3.3V and cannot be
changed. The REG3 output voltage can be set by the
PGM3 input to either 3.3V (connect PGM3 to IN), 2.5V
(connect PGM3 to REF), or 1.8V (connect PGM3 to
GND). The REG2 output voltage is set between 0.70V
and V IN through a resistive voltage-divider from the
REG2 output voltage to FB2 (Figure 1).
Select feedback resistor R5 to be less than 14k ? . R4 is
then given by:
? V ?
? V FB 2 ?
where V FB2 = 0.70V and V OUT is the REG2 output voltage.
14
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1702BETX+ | 功能描述:PMIC 解决方案 Triple-Output for MPU-Based System RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX1702BETX+T | 功能描述:PMIC 解决方案 Triple-Output for MPU-Based System RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX1702BETX-T | 功能描述:PMIC 解决方案 RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX1702EVKIT | 功能描述:电源管理IC开发工具 RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX17030EVKIT+ | 功能描述:电源管理IC开发工具 MAX17030 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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