參數(shù)資料
型號(hào)： MAX8588ETM
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 電源管理
英文描述： High-Efficiency, Low-IQ PMIC with Dynamic Core for PDAs and Smartphones
中文描述： 7-CHANNEL POWER SUPPLY SUPPORT CKT, QCC48
封裝： 6 X 6 MM, 0.80 MM HEIGHT, TQFN-48
文件頁(yè)數(shù)： 28/31頁(yè)
文件大小： 572K
代理商： MAX8588ETM
M
High-Efficiency, Low-I
Q
PMIC with
Dynamic Core for PDAs and Smartphones
28
______________________________________________________________________________________
Rechargeable Li+ Backup Battery
If more backup power is needed and a primary cell has
inadequate capacity, a rechargeable lithium cell can be
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-
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
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.
PC Board Layout and Routing
Good PC board layout is important to achieve optimal
performance. Conductors carrying discontinuous cur-
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
only one point to minimize the effects of power-ground
currents. Typically, the ground planes are best joined
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
small as possible and should be routed away from
high-impedance nodes such as FB_.
MAX8588
MAIN
POWER
D1
1N4148
IN
BKBT
V7
4.7
μ
F
1
μ
F
Figure 8. BKBT connection when no backup battery is used, or
if an alternate backup scheme, not involving the MAX8588, is
used.
MAX8588
MAIN
POWER
1-CELL
Li+ RECHARGEABLE
BACKUP BATTERY
IN
BKBT
1k
V7
V1
4.7
μ
F
1
μ
F
4.7
μ
F
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.
MAX8588
MAX1724
EZK30
MAIN
POWER
1N4148
MURATA
LQH32C 10
μ
H
1-CELL
NiMH
RECHARGEABLE
BACKUP BATTERY
10k
IN
BKBT
GND
BATT
LX
SHDN
OUT
V7
4.7
μ
F
4.7
μ
F
1
μ
F
10
μ
F
3.0V
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.
相關(guān)PDF資料
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX8588ETM+ 功能描述:PMIC 解決方案 High-Efficiency Low IQ PMIC RoHS:否 制造商:Texas Instruments 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel
MAX8588ETM+T 功能描述:PMIC 解決方案 High-Efficiency Low IQ PMIC RoHS:否 制造商:Texas Instruments 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel
MAX8588ETM-T 功能描述:PMIC 解決方案 High-Efficiency Low IQ PMIC RoHS:否 制造商:Texas Instruments 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel
MAX858C/D 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 DICE SALES DICE RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
MAX858CPA 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
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