MAX887HC Просмотр технического описания (PDF) - Maxim Integrated
Номер в каталоге
Компоненты Описание
Список матч
MAX887HC Datasheet PDF : 12 Pages
| |||
100% Duty Cycle, Low-Noise,
Step-Down, PWM DC-DC Converter
ELECTRICAL CHARACTERISTICS
(V+ = +7V, PGND = GND = 0V, SHDN = V+, (TA = -40°C to +85°C), unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP
Supply Range
V+
3.5
Quiescent Supply Current
(PWM Mode)
IV+, PWM IOUT = 0mA, SYNC = 3.0V
2.7
Quiescent Supply Current
(PFM Mode)
Shutdown Supply Current
Output Voltage Range
PWM FB Feedback Threshold
FB Input Current
PWM Switching Frequency
High-Side Current Limit
Undervoltage Lockout
Startup Voltage
IV+, PFM
IV+, SHDN
VOUT, RANGE
VFB
IFB
fOSC
ILIM+
V+, UVLO
V+, START
IOUT = 0mA, SYNC = GND
SHDN = GND
Circuit of Figure 2
SYNC = 3.0V, PWM duty cycle = 50%
FB = 1.30V
SYNC = 3.0V
V+ falling
V+ rising
1.25
1.222
250
0.75
0.2
2.5
1.250
300
1.00
3.0
3.1
Note 2: Specifications from 0°C to -40°C are guaranteed by design and not production tested.
MAX
11.0
4.0
0.6
5
10.50
1.278
±0.10
350
1.50
3.3
3.5
UNITS
V
mA
mA
µA
V
V
µA
kHz
A
V
V
__________________________________________Typical Operating Characteristics
(Circuit of Figure 2, TA = +25°C, unless otherwise noted.)
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
DROPOUT VOLTAGE
vs. LOAD CURRENT
3.3V SETTING
VOUT = 3.135V
5V SETTING
VOUT = 4.75V
200 400 600 800 1000
LOAD CURRENT (mA)
EFFICIENCY vs. OUTPUT CURRENT
100
90
PWM MODE
(SYNC = VL)
80
VOUT = 3.3V
70
VIN = 4V
60
50
VIN = 5V
VIN = 9V
40
VIN = 7V
30
VIN = 11V
20
10
0
0.0001 0.001 0.01
0.1
0.6
OUTPUT CURRENT (A)
EFFICIENCY vs. OUTPUT CURRENT
100
90
PWM MODE
(SYNC = VL)
80
VOUT = 5V
70
60
VIN = 7V
VIN = 9V
50
40 VIN = 5.5V
30
VIN = 11V
20
10
0
0.0001 0.001 0.01
0.1
0.6
OUTPUT CURRENT (A)
_______________________________________________________________________________________ 3
Share Link: 