MAX5066 Maxim Integrated Products, MAX5066 Datasheet - Page 14

• Manufacturer Part Number: MAX5066
• Description: Synchronous Buck Controller
• Manufacturer: Maxim Integrated Products

The high-side drivers (DH1 and DH2) and low-side dri-
vers (DL1 and DL2) drive the gates of external n-channel
MOSFETs. The high-peak sink and source current capa-
bility of these drivers provides ample drive for the fast
rise and fall times of the switching MOSFETs. Faster rise
and fall times result in reduced switching losses. For low-
Configurable, Single-/Dual-Output, Synchronous
Buck Controller for High-Current Applications
Figure 3. Current Comparator and MOSFET Driver Logic
Figure 4. Voltage Error Amplifier
14
C
OUT
______________________________________________________________________________________
V
OUT
RAMP
CSN_
CLP_
CSP_
GM
CLK
EN_
IN
LOAD
MOSFET Gate Drivers (DH_, DL_)
2 x f
SW
(V/S)
R
R
A
1
2
V
52.5mV
= 36
1.225V
EAN_
V
REF
= 0.61V
g
M
R
= 500µS
F
PEAK-CURRENT
COMPARATOR
COMPARATOR
PWM
EAOUT_
output, voltage-regulating applications where the duty
cycle is less than 50%, choose high-side MOSFETs (Q2
and Q4, Figure 6) with a moderate R
low gate charge. Choose low-side MOSFETs (Q1 and
Q3, Figure 6) with very low R
charge. The driver block also includes a logic circuit that
provides an adaptive nonoverlap time (30ns typical) to
Figure 5. Defining the Voltage-Positioning Window
V
V
CNTR
CNTR
+ ∆V
- ∆V
S
R
V
OUT
OUT
CNTR
NO LOAD
/2
/2
Q
Q
1/2 LOAD
LOAD (A)
V
DD
DS(ON)
and moderate gate
DS(ON)
BST_
DH_
LX_
DL_
PGND
and a very
FULL LOAD