SC4808B Просмотр технического описания (PDF) - Semtech Corporation
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SC4808B Datasheet PDF : 31 Pages
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SC4808A/B
POWER MANAGEMENT
Absolute Maximum Ratings
Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified in
the Electrical Characteristics section is not implied.
Parameter
Symbol
Maximum
Units
Supply Voltage
Supply Current
SYNC, RC,CS, LUVLO, REF to GND
VCC
-0.5 to18
V
ICC
20
mA
-0.5 to 7
V
FB to GND
REF Current
OUTA/OUTB to GND
OUTA/OUTB Source Current (peak)
OUTA/OUTB Sink Current (peak)
Power Dissipation at TA = 25°C
Thermal Resistance
Junction Temperature
Storage Temperature Range
Lead Temperature (Soldering) 10 Sec.
ESD Rating (Human Body Model)
VFB
IREF
VOUTA/B
Isource
Isink
PD
θJA
TJ
TSTG
TLEAD
VESD
-0.5 to (VREF+ 0.5)
10
-0.5 to 18
-250
250
1.105
113.1
-40 to 150
-65 to 150
+300
2
V
mA
V
mA
mA
W
°C/W
°C
°C
°C
kV
Electrical Characteristics
Unless specified: VCC = 12V; CL = 100pF; TA = -40°C to 105°C
Parameter
Test Conditions
PWM
Maximum Duty Cycle
Fosc = 50kHz, FB = 5V,
Measured at OUTA or OUTB
Minimum Duty Cycle
Fosc = 50kHz, FB = 1.5V,
Measured at OUTA or OUTB
Current Sense
Gain
Maximum Input Signal
CS to Output Delay
Over Current Threshold
Internal Slope Compensation
Resistor
FB to CS Offset
Output
OUT Low Level
OUT High Level
Rise Time
Fall Time
Min
Typ
Max
Unit
48
49
50
%
0
%
475
.850
1.30
3
525
575
mV
100
ns
.950
1
V
25
kΩ
1.50
1.70
V
0
.50
.70
V
11.0
11.25 12.00
V
25
ns
25
ns
2005 Semtech Corp.
2
www.semtech.com
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