Rainbow-electronics MAX15041 Uživatelský manuál Strana 3

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MAX15041
Low-Cost, 3A, 4.5V to 28V Input, 350kHz, PWM
Step-Down DC-DC Regulator with Internal Switches
_______________________________________________________________________________________ 3
Note 3: Specifications are 100% production tested at T
A
= +25°C. Limits over the operating temperature range are guaranteed by
design and characterization.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SS Current I
SS
V
SS
= 0.45V, sourcing 4.5 5 5.5 µA
SS Discharge Resistance R
SS
I
SS
= 10mA, sinking, V
EN
= 1.6V 6
SS Prebiased Mode Stop Voltage 0.65 V
Current Sense to COMP
Transconductance
G
MOD
9S
COMP Clamp Low V
FB
= 0.7V 0.68 V
PWM Compensation Ramp Valley 830 mV
PWM CLOCK
Switching Frequency f
SW
315 350 385 kHz
Maximum Duty Cycle D 90 %
Minimum Controllable On-Time 150 ns
INTERNAL LDO OUTPUT (V
DD
)
V
DD
Output Voltage V
DD
I
VDD
= 1mA to 25mA, V
IN
= 6.5V 4.75 5.1 5.5 V
V
DD
Short-Circuit Current V
IN
= 6.5V 30 80 mA
LDO Dropout Voltage I
VDD
= 25mA, V
DD
drops by -2% 50 600 mV
V
DD
Undervoltage Lockout
Threshold
V
UVLO_TH
V
DD
rising 4 4.25 V
V
DD
Undervoltage Lockout
Hysteresis
V
UVLO_HYST
150 mV
POWER SWITCH
High-side switch, I
LX
= 1A 170 305
LX On-Resistance
Low-side switch, I
LX
= 1A 105 175
m
High-Side Switch Source
Current-Limit Threshold
5 6 7.2 A
Low-Side Switch Sink
Current-Limit Threshold
-3 A
V
BST
= 33V, V
IN
= V
LX
= 28V 10
LX Leakage Current
V
BST
= 5V, V
IN
= 28V, V
LX
= 0V 10
nA
BST Leakage Current V
BST
= 33V, V
IN
= V
LX
= 28V 10 nA
THERMAL SHUTDOWN
Thermal-Shutdown Threshold Rising +155 °C
Thermal-Shutdown Hysteresis 20 °C
HICCUP PROTECTION
Blanking Time
16 x Soft-
Start Time
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 12V, C
VDD
= 1µF, C
IN
= 22µF, T
A
= T
J
= -40°C to +85°C, typical values are at T
A
= +25°C, unless otherwise noted.) (Note 3)
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