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| 型号： | MAX1587AETL+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 27/30页 |
| 文件大小： | 0K |
| 描述： | IC POWER MANAGEMENT 40-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 手持/移动设备 |
| 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： | 40-WFQFN 裸露焊盘 |
| 供应商设备封装： | 40-TQFN-EP（6x6） |
| 包装： | 带卷 (TR) |
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High-Efficiency, Low-I Q PMICs with
Dynamic Core for PDAs and Smart Phones
We choose 22μF.
Recalculate R C using the selected C OUT .
R C = C OUT x R LOAD /C C = 208k Ω
Note that the pole cancellation does not have to be
exact. R C x C C need only be within 0.75 to 1.25 times
R LOAD x C OUT . This provides flexibility in component
selection.
If the output filter capacitor has significant ESR, a zero
occurs at:
Z ESR = 1/(2 π x C OUT x R ESR )
MAX1586
MAX1587
STEP-DOWN
PWM
REG3
PV3
LX3
PG3
TO BATT
R24**
3.3k Ω
V3
VCC_CORE
1.55V MAX
If Z ESR > f C , it can be ignored, as is typically the case
FB3
with ceramic or polymer output capacitors. If Z ESR is
less than f C , it should be cancelled with a pole set by
capacitor C P connected from CC_ to GND:
C P = C OUT x R ESR /R C
If C P is calculated to be < 10pF, it can be omitted.
Optimizing Transient Response
In applications that require load-transient response to
185.5k Ω
** OTHER R24 VALUES:
R24 = 5.5k Ω , V3: 0.759V TO 1.60V
R24 = 7.7k Ω , V3: 0.783V TO 1.65V
R25
100k Ω
be optimized in favor of minimum component values,
increase the output filter capacitor to increase the R in
the compensation RC. From the equations in the previ-
ous section, doubling the output cap allows a doubling
of the compensation R, which then doubles the tran-
sient gain.
Applications Information
Extending the Maximum Core
Voltage Range
The V3 output can be serially programmed to supply
from 0.7V to 1.475V in 25mV steps. In some cases, a
higher CPU core voltage may be desired. The V3 volt-
age range can be increased by adding two resistors as
shown in Figure 7.
R24 and R25 add a small amount of gain. They are set
so that an internally programmed value of 1.475V
results in a higher actual output at V3. The resistors
shown in Figure 7 set a maximum output of 1.55V, 1.6V,
or 1.65V. All output steps are shifted and the step size
is also slightly increased.
The output voltage for each programmed step of V3 in
Figure 7 is:
V3 = V3 PROG + R24[(V3 PROG /R25) +
(V3 PROG /185.5k Ω )]
where V3 is the actual output voltage, V3 PROG is the
original programmed voltage from the "OUTPUT (V)"
Figure 7. Addition of R24 and R25 increases maximum core
voltage. The values shown raise the maximum core from
1.475V to 1.55V.
column in Table 2, and 185.5k Ω is the internal resis-
tance of the FB3 pin.
Backup-Battery and V7 Configurations
The MAX1586/MAX1587 include a backup-battery con-
nection, BKBT, and an output, V7. These can be utilized
in different ways for various system configurations.
Primary Backup Battery
A connection with a primary (nonrechargeable) lithium
coin cell is shown in Figure 6. The lithium cell connects to
BKBT directly. V7 powers the CPU VCC_BATT from either
V1 (if enabled) or the backup battery. It is assumed
whenever the main battery is good, V1 is on (either with
its DC-DC converter or sleep LDO) to supply V7.
No Backup Battery (or Alternate Backup)
If no backup battery is used, or if an alternate backup
and VCC_BATT scheme is used that does not use the
MAX1586/MAX1587, then BKBT should be biased from
IN with a small silicon diode (1N4148 or similar, as in
Figure 8). BKBT must still be powered when no backup
battery is used because DBO , RSO , and POK require
this supply to function. If BKBT is not powered, these
outputs do not function and are high impedance.
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1587AEVKIT | 功能描述:直流/直流开关转换器 MAX1587A Evaluation Kit/Evaluation System RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1587AEVSYS | 功能描述:直流/直流开关转换器 High-Efficiency Low-IQ PMICs with Dynamic Core for PDAs and Smartphones RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1587CETL | 功能描述:直流/直流开关调节器 PMICs w/Dynamic Core for PDAs RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX1587CETL+ | 功能描述:直流/直流开关调节器 PMICs w/Dynamic Core for PDAs RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX1587CETL+T | 功能描述:直流/直流开关调节器 PMICs w/Dynamic Core for PDAs RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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