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MC34844
ELECTRICAL CHARACTERISTICS
STATIC AND DYNAMIC ELECTRICAL CHARACTERISTICS
STATIC AND DYNAMIC ELECTRICAL CHARACTERISTICS
Table 4. Static and Dynamic Electrical Characteristics
Characteristics noted under conditions V IN = 12 V, V OUT = 42 V, I LED = 50 mA, PWM = VDC1, M/~S = VDC1,
PIN & NIN = VDC1, - 40 ° C ≤ T A ≤ 105 ° C, PGND = 0 V, unless otherwise noted.
Characteristic
Symbol
Min
Typ
Max
Unit
SUPPLY
Supply Voltage
V IN
7.0
12
28
V
Supply Current when Shutdown Mode
I SHUTDOWN
Manual & SM Bus: EN = Low, SCK & SDA=Low
I 2 C: EN = Low, SETI 2 C bit = 1, CLRI 2 C bit = 0
-
-
2.0
17
-
-
μ A
Supply Current when Sleep Mode
I SLEEP
-
3.0
-
mA
SM-Bus: EN = low, SCK & SDA= Active, SETI2C bit = 0, EN bit = 0
I 2 C: EN = High, SETI 2 C bit = 1, CLRI 2 C bit = 0, EN bit = 0
Supply Current when Operational Mode
I OPERATIONAL
-
10.0
-
mA
Manual: EN= High, SCK & SDA=Low, PWM=Low
SM-Bus: EN= Low, SCK & SDA=Active, EN bit= 1, PWM=Low
I 2 C: EN = High, SETI 2 C bit = 1, CLRI 2 C bit = 0, EN bit = 1, PWM=Low
Under-voltage Lockout
UVLO
5.4
6.0
6.4
V
V IN Rising
Under-voltage Hysteresis
UVLO HYST
150
200
250
mV
V IN Falling
VDC1 Voltage (6)
V DC1
2.4
2.5
2.6
V
C VDC1 = 2.2 μ F
VDC2 Voltage (6)
V DC2
5.5
6.0
6.5
V
C VDC2 = 2.2 μ F
VDC3 Voltage (6)
V DC3
2.4
2.5
2.6
V
C VDC3 = 2.2 μ F
BOOST
Output Voltage Range (7)
V
VIN = 7.0 V
VIN = 28 V
V OUT1
V OUT2
8.0
31
-
-
43
60
Boost Switch Current Limit
RDSON of Internal FET
I FET
R DSON
2.3
-
2.5
250
2.7
500
A
m Ω
I DRAIN = 1.0 A
Boost Switch Off-state Leakage Current
I BOOST_LEAK
-
-
10
μ A
V SWA,SWB = 65 V
Peak Boost Efficiency (8)
EFF BOOST
-
90
-
%
Notes
6. This output is for internal use only and not to be used for other purposes. A 1.0 k Ω resistor between the VDC3 and VDC1 pin is
recommended for <-20 °C operation.
7. Minimum and Maximum output voltages are dependent on Min/Max duty cycle condition.
8. Guaranteed by design
34844
Analog Integrated Circuit Device Data
9
Freescale Semiconductor
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