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.

BST1

DH1

LX1

DL1

BST2

DH2

LX2

DL2

PGND

2 CSP2

1 CSN2

13 CSP1

14 CSN1

CA1

EAN1

AVGLIMIT

AGND

EN1

EN2

CA2

CPWM1

CPWM2

7 RT/CLKIN

CEA1

CEA2

EAOUT1

MODE

EAOUT2

CLP2

CLP1

REG

1.225V

THERMAL

SHUTDOWN

MUX

EAN2

CEN1

VEA1

DF1 AND

HICCUP

LOGIC

EXTERNAL FREQUENCY SYNC

CONTROL

AND DRIVER

LOGIC 1

CONTROL

AND DRIVER

LOGIC 2

DF2 AND

HICCUP

LOGIC

OSCILLATOR

AND PHASE

SPLITTER

180

P-P

RAMP

REG

= 5V

FOR INTERNAL
BIASING

UVLO

INTREF

= 0.61V

VEA2

CEN2

P-P

RAMP

Figure 1. Block Diagram

Configurable, Single-/Dual-Output, Synchronous

Buck Controller for High-Current Applications

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