MAX887HC Просмотр технического описания (PDF) - Maxim Integrated
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MAX887HC Datasheet PDF : 12 Pages
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100% Duty Cycle, Low-Noise,
Step-Down, PWM DC-DC Converter
ABSOLUTE MAXIMUM RATINGS
REF, FB, SYNC, VL to GND..................................... -0.3V to +6V
V+ to GND ............................................................. -0.3V to +12V
SHDN, LX to GND ....................................... -0.3V to (V+ + 0.3V)
PGND to GND ...................................................... -0.3V to +0.3V
Continuous Power Dissipation (TA = +70°C)
SO (derate 9.09mW/°C above +70°C) .........................471mW
Operating Temperature Ranges
MAX887HC/D.......................................................0°C to +70°C
MAX887HESA ...................................................-40°C to +85°C
Storage Temperature Range ........................... -65°C to +165°C
Lead Temperature (soldering, 10sec) ............................ +300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V+ = +7V, PGND = GND = 0V, SHDN = V+, (TA = 0°C to TMAX), unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
Supply Range
V+
3.5
Quiescent Supply Current
(PWM Mode)
IV+, PWM IOUT = 0mA, SYNC = 3.0V
Quiescent Supply Current
(PFM Mode)
Shutdown Supply Current
Output Voltage Range
Load Regulation
Line Regulation
PWM FB Feedback Threshold
FB Input Current
SYNC Frequency
SYNC Pulse Width High or Low
PWM Maximum Duty Cycle
PWM Switching Frequency
High-Side Current Limit
LX On-Resistance
LX Leakage Current
LX Reverse Leakage Current,
Regulator Off
IV+, PFM
IOUT = 0mA, SYNC = GND
IV+, SHDN
VOUT, RANGE
VFB
IFB
fSYNC
SYNC, PW
PWM, DUTY
fOSC
ILIM+
RON, LX
ILXLKG
SHDN = GND
Circuit of Figure 2
IOUT = 0mA to 500mA
VIN = 4V to 11V, PWM mode
SYNC = 3.0V, PWM duty cycle = 50%
FB = 1.30V
SYNC = 3.0V, FB = 1.18V
SYNC = 3.0V
ILX = ±100mA
V+ = 12V, LX = GND to 12V
ILXLKGR
V+ = floating, LX = 5V, SHDN = GND
1.25
1.225
25
500
100
260
0.75
-10
Undervoltage Lockout
V+, UVLO V+ falling
Startup Voltage
V+, START V+ rising
SYNC Input High Voltage
VIH, SYNC
2.5
SYNC Input Low Voltage
VIL, SYNC
SYNC Input Current
IIN, SYNC SYNC = GND or 3V
SHDN Input High Voltage
VIH, SHDN
2.4
SHDN Input Low Voltage
VIL, SHDN
SHDN Input Current, Sinking
IIN-, SHDN SHDN = GND or V+
SHDN Input Capacitance
CIN, SHDN (Note 1)
VL Output Voltage
VL
IVL = 0mA to 1mA
REF Output Voltage
VREF
0µA to 30µA
Note 1: Guaranteed by design and not production tested.
TYP
2.7
0.2
2.5
0.005
0.2
1.250
300
1.0
0.6
1.0
1.0
3.0
3.1
3.3
1.25
MAX
11.0
4.0
0.5
5
10.50
1.275
±0.10
440
340
1.40
10
20
3.3
3.5
0.5
±1
0.8
±1
10
UNITS
V
mA
mA
µA
V
%/mA
%/V
V
µA
kHz
ns
%
kHz
A
Ω
µA
µA
V
V
V
V
µA
V
V
µA
pF
V
V
2 _______________________________________________________________________________________
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