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參數(shù)資料
| 型號(hào)： | MAX1587AETL |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | High-Efficiency, Low-IQ PMICs with Dynamic Core for PDAs and Smart Phones |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, QCC40 |
| 封裝： | 6 X 6 MM, TQFN-40 |
| 文件頁數(shù)： | 28/32頁 |
| 文件大?。?/td> | 656K |
| 代理商： | MAX1587AETL |
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M
High-Efficiency, Low-I
Q
PMICs with
Dynamic Core for PDAs and Smart Phones
28
______________________________________________________________________________________
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 8). 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_. Refer to the
MAX1586 or MAX1587 evaluation kit data sheets for a
full PC board example.
Increasing V3 (VCC_CORE) Voltage Range
The programmable V3 output voltage range can be
increased by adding two resistors as shown in Figure 9.
Chip Information
TRANSISTOR COUNT: 13,958
PROCESS: BiCMOS
TOP VIEW
RSO
SRAD
PV3
LX3
PG3
V5
IN45
V4
ON45
ON2
V7
V1
SLPIN
V2
FB2
CC2
POK
SCL
BKBT
FB1
1
2
3
4
5
6
7
8
9
10
1
1
1
1
1
1
1
1
1
2
4
3
3
3
3
3
3
3
3
3
30
29
28
27
26
25
24
23
22
21
P
I
R
R
B
L
P
P
S
S
P
L
P
O
O
F
C
M
C
THIN QFN
6mm
×
6mm
MAX1587AETL
G
RSO
SRAD
ON3
PV3
LX3
PG3
ON5
V5
IN45
V4
ON4
ON2
V7
V1
SLPIN
V2
FB2
CC2
CC1
FB1
POK
SCL
BKBT
LB1
P
I
R
R
B
L
P
L
P
S
S
P
L
P
I
V
O
O
F
C
M
D
THIN QFN
7mm
×
7mm
MAX1586AETM
MAX1586BETM
G
D
1
2
3
4
5
6
7
8
9
10
11
12
36
35
34
33
32
31
30
29
28
27
26
25
4
4
4
4
4
4
4
4
4
3
3
3
1
1
1
1
1
1
1
2
2
2
2
2
Pin Configurations
PV3
STEP-DOWN
PWM
REG3
R24 VALUES:
R24 = 3.32k
, V3: 0.73V TO 1.55V, 26mV/STEP
R24 = 5.11k
, V3: 0.75V TO 1.60V, 27mV/STEP
R24 = 7.5k
, V3: 0.78V TO 1.65V, 28mV/STEP
LX3
PG3
FB3
V3
VCC_CORE
TO BATT
R25
100k
R24
MAX1586
MAX1587
Figure 9. Adding R24 and R25 to Increase Core Voltage
Programming Range
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1587AETL+ | 功能描述:直流/直流開關(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 |
| MAX1587AETL+T | 功能描述:直流/直流開關(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 |
| MAX1587AETL-T | 功能描述:直流/直流開關(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 |
| MAX1587AEVKIT | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 MAX1587A Evaluation Kit/Evaluation System 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 |
| MAX1587AEVSYS | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 High-Efficiency Low-IQ PMICs with Dynamic Core for PDAs and Smartphones 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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