參數(shù)資料
型號(hào)： MAX1586
廠商： Maxim Integrated Products, Inc.
英文描述： High-Efficiency, Low-IQ PMICs with Dynamic Core for PDAs and Smart Phones
中文描述： 高效率，低智商與動(dòng)態(tài)的PDA和智能手機(jī)PMIC的核心
文件頁(yè)數(shù)： 27/32頁(yè)
文件大?。?/td> 656K
代理商： MAX1586
M
High-Efficiency, Low-I
Q
PMICs with
Dynamic Core for PDAs and Smart Phones
______________________________________________________________________________________
27
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
)
If Z
ESR
> f
C
, it can be ignored, as is typically the case
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
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
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
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 5. 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 6). 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.
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 7. A series resistor
and diode charge the cell when the 3.3V V1 supply is
MAX1586
MAX1587
MAIN
POWER
D1
1N4148
IN
BKBT
V7
4.7
μ
F
1
μ
F
Figure 6. BKBT connection when no backup battery is used, or
if an alternate backup scheme, not involving the
MAX1586/MAX1587, is used.
MAX1586
MAX1587
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 7. 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.
MAX1586
MAX1587
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 8. 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
PDF描述
MAX1587 High-Efficiency, Low-IQ PMICs with Dynamic Core for PDAs and Smart Phones
MAX1587AETL High-Efficiency, Low-IQ PMICs with Dynamic Core for PDAs and Smart Phones
MAX1586BETM High-Efficiency, Low-IQ PMICs with Dynamic Core for PDAs and Smart Phones
MAX1589A Low-Input-Voltage, 500mA LDO Regulator with RESET in SOT and TDFN
MAX1589AETT Low-Input-Voltage, 500mA LDO Regulator with RESET in SOT and TDFN
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1586AETM 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 PMICs w/Dynamic Core for PDAs RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
MAX1586AETM+ 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 PMICs w/Dynamic Core for PDAs RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
MAX1586AETM+T 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 PMICs w/Dynamic Core for PDAs RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
MAX1586AETM-T 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 PMICs w/Dynamic Core for PDAs RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
MAX1586AEVCMAXQU 功能描述:電源管理IC開(kāi)發(fā)工具 MAX1586A Evaluation Kit/Evaluation System RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
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