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參數(shù)資料
| 型號： | MAX687 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | High-Accuracy, Low-Dropout Linear Regulators(3V,用于便攜電話的,高精度線性穩(wěn)壓控制器) |
| 中文描述： | 高精度、低壓差線性穩(wěn)壓器 |
| 文件頁數(shù)： | 3/12頁 |
| 文件大小： | 128K |
| 代理商： | MAX687 |
M
High-Ac c urac y, Low-Dropout
Linear Regulators
_______________________________________________________________________________________
3
Note 1:
Minimum V
IN
for regulated V
OUT
depends on the characteristics of the external PNP transistor, and on the load. The refer-
ence and comparators are functional down to the minimum voltage specified, but the output may not be in regulation.
Note 2:
Dropout voltage is defined as V
IN
- V
OUT
when V
OUT
is 50mV below its value at V
IN
= V
NOM
+ 1V.
Note 3:
The start-up time specification is the time taken from ON or SHDN rising to BASE sinking current. V
OUT
rise time is longer
and is a function of load capacitance, C2, and load resistance, R
L
.
Note 4:
Minimum load capacitance is a function of R
L
. Minimum C2 = 10μF for loads up to 100mA and 1μF/10mA for higher loads.
ESR of C2 should be no larger than 1/100 of R
L
. Guaranteed by design.
Note 5:
The nominal output voltage, V
NOM
, is defined under the default conditions of testing: V
IN
= 3.8V, I
BASE
= 1mA, T
A
= T
MIN
to T
MAX
.
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 3.8V, SHDN = V
IN
(MAX688/MAX689), R
B
= 0
, C1 = 2.2μF, C2 = 10μF, C3 = 10nF, T
A
= T
MIN
to T
MAX
, unless otherwise
noted. Typical values are at T
A
= +25°C.)
Falling V
OUT
, comparators monitor V
OUT
Glitch immunity
I
SINK
= 1.2mA, V
IN
= 2.7V
Rising SHDN, standby
→
on
V
SHDN
= 1.23V
Shutdown
Standby
Falling V
OUT
, comparators monitor V
OUT
I
SOURCE
= 50μA, part on, V
IN
= 2.7V
I
SINK
= 1.2mA, V
IN
= 2.7V
On, SHDN falling
Output turns on
Output remains off
CONDITIONS
μs
V
100
0.06
PFO, SHDN Transient Rejection
PFO Output Voltage Low
mV
nA
70
SHDN Hysteresis
SHDN Input Current
0.2
V
SSD
1.0
1.2
V
SSY
V
1.25
V
SON
SHDN Threshold Voltages
mV
110
170
V
NOM
-
V
PFT
PFO Threshold Voltage Below
V
NOM
(Note 5)
PFO Hysteresis
mV
7
PFO Hysteresis
V
V
V
2.96
V
OUT
- 0.3
V
SD
V
OH
V
OL
Shutdown Threshold Voltage
PFO Output Voltage High
PFO Output Voltage Low
V
1.0
V
IH
V
IL
ON Threshold Voltage
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
0.06
0.3
0.2
100
nA
0.2
ON Input Leakage Current
MAX688/MAX689: SHDN, PFO
Falling V
OUT
, com-
parators monitor V
OUT
V
3.07
2.77
3.13
2.85
3.19
2.89
V
PFT
PFO Threshold Voltage
MAX688
MAX689
-25
25
10Hz
≤
f
≤
10kHz, I
LOAD
= 200mA
10Hz
≤
f
≤
1MHz, I
LOAD
= 200mA
V
PFO
= 11V, V
SHDN
> 1.25V
μA
1
66
105
e
n
Output Noise Voltage
PFO Off Leakage Current
0.3
V
OL
μV
RMS
Falling V
OUT
, comparators monitor V
OUT
mV
20
70
V
PFT
- V
SD
Shutdown Threshold Voltage
Below V
PFT
mV
7
MAX687: ON, PFO, SHDN
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