Rainbow Electronics MAX15034 User Manual
Page 11
MAX15034
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
necessary to provide for the MAX15034’s internal
circuitry and the power for the external MOSFET’s gate
drivers. Internal UVLO circuitry ensures that the
MAX15034 starts up when V
REG
is at the correct volt-
age levels to guarantee safe operation of the IC and of
the power MOSFETs.
Finally, a thermal-shutdown feature protects the device
during thermal faults and shuts down the MAX15034
when the die temperature exceeds +160°C.
16
17
18
19
BST1
DH1
LX1
DL1
20
27
26
25
24
23
BST2
DH2
LX2
DL2
PGND
V
DD
2 CSP2
1 CSN2
13 CSP1
14 CSN1
CA1
11
EAN1
6
AVGLIMIT
AGND
8
EN1
15
EN2
28
CA2
CPWM1
CPWM2
7 RT/CLKIN
CEA1
CEA2
12
EAOUT1
9
MODE
3
EAOUT2
5
CLP2
10
CLP1
22
IN
21
REG
1.225V
1.225V
THERMAL
SHUTDOWN
V
DD
MUX
4
EAN2
CEN1
VEA1
DF1 AND
HICCUP
LOGIC
EXTERNAL FREQUENCY SYNC
0
°
CONTROL
AND DRIVER
LOGIC 1
CONTROL
AND DRIVER
LOGIC 2
DF2 AND
HICCUP
LOGIC
OSCILLATOR
AND PHASE
SPLITTER
180
°
2V
P-P
RAMP
V
REG
= 5V
FOR INTERNAL
BIASING
UVLO
V
INTREF
= 0.61V
VEA2
CEN2
2V
P-P
RAMP
Figure 1. Block Diagram
Configurable, Single-/Dual-Output, Synchronous
Buck Controller for High-Current Applications
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