參數(shù)資料
型號(hào)： MAX887
廠商： Maxim Integrated Products, Inc.
元件分類： DC/DC變換器
英文描述： 100% Duty Cycle, Low-Noise, Step-Down, PWM DC-DC Converter
中文描述： 100%占空比、低噪聲、降壓型、PWM DC-DC轉(zhuǎn)換器
文件頁(yè)數(shù)： 3/12頁(yè)
文件大小： 146K
代理商： MAX887
M
100% Duty Cyc le, Low-Noise,
S tep-Down, PWM DC-DC Converter
_______________________________________________________________________________________
3
Note 2:
Specifications from 0°C to -40°C are guaranteed by design and not production tested.
I
OUT
= 0mA, SYNC = GND
V+ rising
I
OUT
= 0mA, SYNC = 3.0V
V+ falling
SYNC = 3.0V
FB = 1.30V
SYNC = 3.0V, PWM duty cycle = 50%
SHDN
= GND
Circuit of Figure 2
CONDITIONS
V
3.1
3.5
V
+, START
Startup Voltage
V
3.0
3.3
V
+, UVLO
Undervoltage Lockout
A
0.75
1.00
1.50
I
LIM+
High-Side Current Limit
kHz
250
300
350
f
OSC
PWM Switching Frequency
mA
0.2
0.6
I
V+, PFM
Quiescent Supply Current
(PFM Mode)
mA
2.7
4.0
I
V+, PWM
V
3.5
11.0
V+
Supply Range
Quiescent Supply Current
(PWM Mode)
μA
±0.10
I
FB
FB Input Current
V
1.222
1.250
1.278
V
FB
PWM FB Feedback Threshold
μA
V
2.5
5
I
V+, SHDN
V
OUT, RANGE
Shutdown Supply Current
Output Voltage Range
1.25
10.50
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
ELECTRICAL CHARACTERISTICS
(V+ = +7V, PGND = GND = 0V,
SHDN
= V+,
(T
A
= -40°C to +85°C)
, unless otherwise noted.) (Note 2)
__________________________________________Typic al Operating Charac teristic s
(Circuit of Figure 2, T
A
= +25°C, unless otherwise noted.)
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0
200
400
600
800
1000
LOAD CURRENT (mA)
DROPOUT VOLTAGE
vs. LOAD CURRENT
M
D
3.3V SETTING
V
OUT
= 3.135V
5V SETTING
V
OUT
= 4.75V
0
10
20
30
40
50
60
70
80
90
100
0.0001
0.001
OUTPUT CURRENT (A)
0.01
0.1
0.6
E
EFFICIENCY vs. OUTPUT CURRENT
M
PWM MODE
(SYNC = VL)
V
OUT
= 3.3V
V
IN
= 4V
V
IN
= 5V
V
IN
= 7V
V
IN
= 11V
V
IN
= 9V
0
10
20
30
40
50
60
70
80
90
100
0.0001
0.001
0.01
0.1
0.6
E
OUTPUT CURRENT (A)
EFFICIENCY vs. OUTPUT CURRENT
M
PWM MODE
(SYNC = VL)
V
OUT
= 5V
V
IN
= 9V
V
IN
= 5.5V
V
IN
= 11V
V
IN
= 7V
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