Datasheet

3Maxim Integrated
High-Efficiency, 4A, Step-Down DC-DC
Regulators with Internal Power Switches
MAX15066/MAX15166
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 12V, C
VDD
= 1FF, C
IN
= 22FF, T
A
= T
J
= -40NC to +85NC, typical values are at T
A
= T
J
= +25NC, unless otherwise noted.)
(Note 4)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Error-Amplifier Voltage Gain A
VEA
90 dB
FB Set-Point Accuracy V
FB
600 606 612 mV
FB Input Bias Current I
FB
V
FB
= 0.5V or 0.7V -100 +100 nA
SOFT-START
SS Current I
SS
V
SS
= 0.45V, sourcing 4.5 5 5.5
FA
SS Discharge Resistance R
SS
I
SS
= 10mA, sinking 6
I
CURRENT SENSE
Current Sense to COMP
Transconductance
g
MC
9 S
COMP Clamp Low V
FB
= 0.7V 0.68 V
PWM CLOCK
Switching Frequency f
SW
MAX15066 450 500 550
kHz
MAX15166 315 350 385
Maximum Duty Cycle D
MAX
90 %
Minimum Controllable On-Time 150 ns
Slope Compensation Ramp
Valley
840 mV
Slope Compensation Ramp
Amplitude
V
SLOPE
Extrapolated to 100% duty cycle 667 mV
INTERNAL LDO OUTPUT (V
DD
)
V
DD
Output Voltage V
DD
I
VDD
= 1mA, V
IN
= 6.5V to 16V 4.75 5.1 5.45
V
I
VDD
= 1mA to 25mA, V
IN
= 6.5V 4.75 5.1 5.45
V
DD
Short-Circuit Current V
IN
= 6.5V 30 90 mA
V
DD
LDO Dropout Voltage I
VDD
= 5mA, V
DD
drops by 2% 100 mV
V
DD
Undervoltage Lockout
Threshold
V
UVLO_TH
V
DD
rising, LX starts switching 3.7 3.9 4.1 V
V
DD
Undervoltage Lockout
Hysteresis
V
UVLO_
HYST
150 mV
POWER SWITCH
LX On-Resistance
High-side switch, I
LX
= 0.4A 40
mI
Low-side switch, I
LX
= 0.4A 18.5
High-Side Switch Source
Current-Limit Threshold
I
HSCL
5.5 7.7 A
Low-Side Switch Zero-Crossing
Current-Limit Threshold
0.21 A
High-Side Switch Skip Sourcing
Current-Limit Threshold
0.58 A
LX Leakage Current
V
BST
= 21V, V
IN
= V
LX
= 16V 0.01
FA
V
BST
= 5V, V
IN
= 16V, V
LX
= 0V 0.01
BST Leakage Current V
BST
= 21V, V
IN
= V
LX
= 16V 0.01
FA
BST On-Resistance I
BST
= 5mA 10
I