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參數(shù)資料
| 型號： | MAX1552 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Complete Power IC for Low-Cost PDAs |
| 中文描述： | 完備的電源芯片，用于低成本PDA |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 324K |
| 代理商： | MAX1552 |
M
Voltage Monitors (
LBO
)—System Sleep
The MAX1552 monitors the battery voltage at IN. When
V
IN
falls below 3.6V,
LBO
goes low, typically putting the
system (μP) into a sleep state. The MAX1552 remains
fully functional in this state and all outputs maintain nor-
mal operation. However, when in sleep mode, the sys-
tem (μP) typically drives ENSD, ENC2, and ENLCD low,
turning off COR2, SDIG, and the LCD boost output.
Sleep can be set by the system (μP) even without a low
battery event. The MAX1552 consumes 50μA when the
system is in sleep mode. The
LBO
output is deasserted
when the battery voltage rises above 3.8V
All regulated outputs turn off when V
IN
falls below 3V.
The MAX1552 resumes normal operation when V
IN
rises above 3.4V.
Reset Output (
RS
)
Reset (
RS)
asserts when V
IN
goes below 3V. The reset
output remains asserted until V
IN
rises above 3.4V.
RS
is an open-drain, active-low output. Connect a 1M
resistor from
RS
to MAIN.
Applications Information
LDO Output Capacitors (MAIN, SDIG,
COR1, and COR2)
Capacitors are required at each output of the MAX1552
for stable operation over the full load and temperature
range. See Figure 1 for recommended capacitor values
for each output. To reduce noise and improve load
transients, use large output capacitors, up to 10μF.
Surface-mount ceramic capacitors have very low ESR
Complete Power IC for
Low-Cost PDAs
8
_______________________________________________________________________________________
MAX1552
MAX1551
MAIN
SDIG
SW
LX
LFB
GND
LBO
IN
SWIN
REF
ON
OFF
V
IN
BATT
DC
USB
PG
GND
POK LOW WHEN
EITHER USB OR DC
IS ABOVE UV AND
ABOVE BATT
C8
0.1
μ
F
ENSD
3.3V, 300mA
C3
4.7
μ
F
C5
4.7
μ
F
C4
4.7
μ
F
C9
4.7
μ
F
R1
1.5M
R2
100k
C2
1
μ
F
C7
30pF
C6
1
μ
F
L1
10
μ
H
D1
3.3V, 200mA
1.5V, 200mA
1.8V, 20mA
LCD 20V, 1mA
ENC2
ENLCD
RESET OUT
LOW BATT OUT
RS
COR1
COR2
MAIN
SDIG
COR2
LCD
1
μ
F
1
μ
F
AC ADAPTER INPUT
3.5V TO 7V
USB INPUT
3.5V TO 6.0V
ON
OFF
ON
OFF
R3
1M
R4
1M
C1
1
μ
F
TO MAIN
BATTERY
CHARGER
POWER
PRESENT
(EITHER DC
OR USB)
CONNECTION FOR
PWM-CONTROLLED
LCD BIAS
R
D
V
WOUT
R
W
C10
Figure 1. Typical Operating Circuit with Charger and External PWM LCD Control
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|---|---|
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