Datasheet

MAX16932/MAX16933
2.2MHz, 36V, Dual Buck
with 20µA Quiescent Current
16Maxim Integrated
Current Capability
The n-channel MOSFETs must deliver the average cur-
rent to the load and the peak current during switching.
Choose MOSFETs with the appropriate average current
at V
GS
= 4.5V or V
GS
= V
EXTVCC
when the internal linear
regulator is bypassed. For load currents below approxi-
mately 3A, dual MOSFETs in a single package can be
an economical solution. To reduce switching noise for
smaller MOSFETs, use a series resistor in the BST_ path
and additional gate capacitance. Contact the factory for
guidance using gate resistors.
Current-Sense Measurement
For the best current-sense accuracy and overcur-
rent protection, use a ±1% tolerance current-sense
resistor between the inductor and output as shown
in Figure 1A. This configuration constantly monitors
the inductor current, allowing accurate current-limit
protection. Use low-inductance current-sense resis-
tors for accurate measurement.
Alternatively, high-power applications that do not require
highly accurate current-limit protection can reduce the
overall power dissipation by connecting a series RC
circuit across the inductor (Figure 1B) with an equivalent
time constant:
CSHL DCR
R2
RR
R1 R2

=

+

Figure 1. Current-Sense Configurartions
C
OUT
C
OUT
C
IN
C
IN
L
NL
NH
INPUT (V
IN
)
A) OUTPUT SERIES RESISTOR SENSING
DH_
LX_
DL_
GND
CS_
OUT_
L
NL
NH
R2
C
EQ
DCR
R1
INPUT (V
IN
)
B) LOSSLESS INDUCTOR SENSING
DH_
LX_
DL_
GND
CS_
OUT_
INDUCTOR
R
CSHL
=
( )
R
DCR
R2
R1 + R2
R
DCR
=
[
+
]
1
R1
1
R2
L
C
EQ
MAX16932
MAX16933
MAX16932
MAX16933
R
SENSE