MAX15034 Datasheet, PDF (11/25 Pages) Maxim Integrated Products – Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications

Configurable, Single-/Dual-Output, Synchronous
Buck Controller for High-Current Applications
CLP1 10
EAOUT1 12
EAN1 11
IN 22
V_REG = 5V
UVLO
REG 21
EN1 15
AVGLIMIT 6
FOR INTERNAL
BIASING
EN2 28
AGND 8
EAN2 4
EAOUT2 3
MODE 9
CLP2 5
V_INTREF = 0.61V
VEA2
CEA1
VEA1
2V_P-P
RAMP
1.225V
CEN1
THERMAL
SHUTDOWN
1.225V
CEN2
2V_P-P
RAMP
MUX
CEA2
CA1
DF1 AND
HICCUP
LOGIC
CPWM1
CONTROL
AND DRIVER
LOGIC 1
0°
13 CSP1
14 CSN1
16 BST1
17 DH1
18 LX1
20 VDD
19 DL1
OSCILLATOR
AND PHASE
SPLITTER
EXTERNAL FREQUENCY SYNC
7 RT/CLKIN
180°
CONTROL
AND DRIVER
LOGIC 2
V_DD
CPWM2
27 BST2
26 DH2
25 LX2
24 DL2
23 PGND
DF2 AND
HICCUP
LOGIC
2 CSP2
CA2
1 CSN2
Figure 1. Block Diagram
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.
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