MAX1537ETX Maxim Integrated, MAX1537ETX Datasheet - Page 30

• Manufacturer Part Number: MAX1537ETX
• Description: Current & Power Monitors & Regulators
• Manufacturer: Maxim Integrated

High-Efficiency, 5x Output, Main Power-Supply
Controllers for Notebook Computers
Alternatively, high-power applications that do not
require highly accurate current-limit protection may
reduce the overall power dissipation by connecting a
series RC circuit across the inductor (Figure 9b) with an
equivalent time constant:
where R
configuration, the current-sense resistance equals the
inductor’s DC resistance (R
case inductance and R
Figure 9. Current-Sense Configurations
30
______________________________________________________________________________________
L
is the inductor’s series DC resistance. In this
R
L
L
a) OUTPUT SERIES RESISTOR SENSING
b) LOSSLESS INDUCTOR SENSING
=
L
MAX1533
MAX1537
MAX1533
MAX1537
C
values provided by the induc-
EQ
SENSE
×
CSH_
CSH_
CSL_
CSL_
DH_
GND
DH_
DL_
GND
LX_
DL_
LX_
R
= R
EQ
L
). Use the worst-
N
N
N
N
H
L
H
L
D
C
C
D
L
IN
IN
L
INPUT (V
INPUT (V
tor manufacturer, adding some margin for the induc-
tance drop over temperature and load.
The output filter capacitor must have low enough equiv-
alent series resistance (ESR) to meet output ripple and
load-transient requirements, yet have high enough ESR
to satisfy stability requirements. The output capaci-
tance must be high enough to absorb the inductor
energy while transitioning from full-load to no-load con-
ditions without tripping the overvoltage fault protection.
When using high-capacitance, low-ESR capacitors (see
the Output-Capacitor Stability Considerations section),
IN
)
IN
L
)
R
EQ
INDUCTOR
C
R
EQ
SENSE
Output Capacitor Selection
C
OUT
C
OUT