MAX5066 Maxim Integrated Products, MAX5066 Datasheet - Page 10

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

Two enable comparators (CEN1 and CEN2) are avail-
able to control and sequence the two PWM sections
through the enable (EN1 or EN2) inputs. An oscillator,
with an externally programmable frequency generates
two clock pulse trains and two ramps for both PWM
sections. The two clocks and the two ramps are 180°
out of phase with each other.
A linear regulator (REG) generates the 5V to supply the
device. This regulator has the output-current capability
Configurable, Single-/Dual-Output, Synchronous
Buck Controller for High-Current Applications
Figure 1. Block Diagram
10
EAOUT1
EAOUT2
MODE
AGND
CLP1
EAN1
EAN2
CLP2
______________________________________________________________________________________
REG
EN1
EN2 28
REF
IN
10
12
11
22
21
15
6
9
5
8
4
3
V
REG
= 5V
V
INTREF
V
REF
= 3.3V
= 0.61V
VEA2
FOR INTERNAL
BIASING
UVLO
UV33
MUX
VEA1
1.225V
1.225V
CEN2
CEN1
RAMP
2V
P-P
RAMP
SHUTDOWN
2V
THERMAL
P-P
CEA2
CEA1
necessary to provide for the MAX5066’s internal circuit-
ry and the power for the external MOSFET’s gate dri-
vers. A low-current linear regulator (REF) provides a
precise 3.3V reference output and is capable of driving
loads of up to 200µA. Internal UVLO circuitry ensures
that the MAX5066 starts up only when V
are at the correct voltage levels to guarantee safe oper-
ation of the IC and of the power MOSFETs.
OSCILLATOR
AND PHASE
SPLITTER
CPWM2
CPWM1
DF1 AND
DF2 AND
HICCUP
HICCUP
LOGIC
LOGIC
180°
0°
EXTERNAL FREQUENCY SYNC
AND DRIVER
AND DRIVER
CONTROL
CONTROL
LOGIC 2
LOGIC 1
CA1
CA2
V
DD
REG
18
19
13 CSP1
14 CSN1
16
20
26
24
17
27
25
23
7 RT/CLKIN
2 CSP2
1 CSN2
and V
DH2
V
BST2
LX2
DL2
BST1
DH1
LX1
DL1
PGND
DD
REF