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参数资料
| 型号： | MAX8588ETM+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 28/31页 |
| 文件大小： | 0K |
| 描述： | IC PMIC HI EFF LOW IQ 48-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 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： | 48-WFQFN 裸露焊盘 |
| 供应商设备封装： | 48-TQFN-EP（6x6） |
| 包装： | 带卷 (TR) |
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High-Efficiency, Low-I Q PMIC with
Dynamic Core for PDAs and Smartphones
Rechargeable Li+ Backup Battery
If more backup power is needed and a primary cell has
inadequate capacity, a rechargeable lithium cell can be
MAIN
POWER
4.7 μ F
D1
IN
MAX8588
accommodated as shown in Figure 9. A series resistor
and diode charge the cell when the 3.3V V1 supply is
active. In addition to biasing V7, the rechargeable bat-
1N4148
1 μ F
BKBT
V7
tery may be required to also power other supplies.
Rechargeable NiMH Backup Battery
In some systems, a NiMH battery may be desired for
backup. Usually this requires multiple cells because
the typical NiMH cell voltage is only 1.2V. By adding a
small DC-DC converter (MAX1724), the low-battery
Figure 8. BKBT connection when no backup battery is used, or
if an alternate backup scheme, not involving the MAX8588, is
used.
voltage is boosted to 3V to bias BKBT (Figure 10). The
DC-DC converter’s low operating current (1.5μA typ)
allows it to remain on constantly so the 3V BKBT bias is
always present. A resistor and diode trickle charge the
NiMH cell when the main power is present.
MAIN
POWER
4.7 μ F
IN
PC Board Layout and Routing
Good PC board layout is important to achieve optimal
performance. Conductors carrying discontinuous cur-
1k ?
V1
MAX8588
rents and any high-current path should be made as
short and wide as possible. A separate low-noise
ground plane containing the reference and signal
grounds should connect to the power-ground plane at
BKBT
only one point to minimize the effects of power-ground
1-CELL
4.7 μ F
currents. Typically, the ground planes are best joined
Li+ RECHARGEABLE
BACKUP BATTERY
1 μ F
V7
right at the IC.
Keep the voltage feedback network very close to the
IC, preferably within 0.2in (5mm) of the FB_ pin. Nodes
with high dV/dt (switching nodes) should be kept as
Figure 9. A 1-cell rechargeable Li+ battery provides more back-
up power when a primary cell is insufficient. The cell is charged
to 3.3V when V1 is active. Alternately, the battery can be
charged from IN if the voltages are appropriate for the cell type.
small as possible and should be routed away from
high-impedance nodes such as FB_.
1N4148
10k ?
MAIN
POWER
MURATA
LQH32C 10 μ H
4.7 μ F
IN
1-CELL
4.7 μ F
BATT
LX
MAX8588
NiMH
RECHARGEABLE
BACKUP BATTERY
MAX1724
EZK30
SHDN
OUT
GND
3.0V
BKBT
V7
10 μ F
1 μ F
Figure 10. A 1-cell NiMH battery can provide backup by boost-
ing with a low-power DC-DC converter. A series resistor-diode
trickle charges the battery when the main power is on.
28
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX858C/D | 功能描述:直流/直流开关转换器 DICE SALES DICE 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 |
| MAX858CPA | 功能描述:直流/直流开关转换器 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 |
| MAX858CSA | 功能描述:直流/直流开关转换器 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 |
| MAX858CSA+ | 功能描述:直流/直流开关转换器 3.3/5/AdjV Step-Up DC/DC Converter 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 |
| MAX858CSA+T | 功能描述:直流/直流开关转换器 3.3/5/AdjV Step-Up DC/DC Converter 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 |
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