MAX15034(2008) データシートの表示（PDF） - Maxim Integrated

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MAX15034
(Rev.:2008)

Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications

Maxim Integrated 

Configurable, Single-/Dual-Output, Synchronous

Buck Controller for High-Current Applications

Pin Description (continued)

PIN

NAME

FUNCTION

15

EN1

Output 1 Enable. A logic-low shuts down channel 1’s MOSFET drivers. EN1 can be used for output

sequencing.

16

BST1 Boost Flying-Capacitor Connection. Reservoir capacitor connection for the high-side MOSFET driver

supply. Connect a 0.47μF ceramic capacitor between BST1 and LX1.

17

DH1 High-Side Gate Driver Output 1. DH1 drives the gate of the high-side MOSFET.

18

LX1

External Inductor Connection and Source Connection for the High-Side MOSFET for Output 1. LX1 also

serves as the return terminal for the high-side MOSFET driver.

19

DL1 Low-Side Gate Driver Output 1. Gate driver output for the synchronous MOSFET.

Supply Voltage for Low-Side Drivers. REG powers VDD. Connect a parallel combination of 0.1μF and 1μF

20

VDD ceramic capacitors from VDD to PGND and a 1Ω resistor from VDD to REG to filter out the high-peak

currents of the driver from the internal circuitry.

21

REG

Internal 5V Regulator Output. REG is derived internally from IN and is used to power the internal bias

circuitry. Bypass REG to AGND with a 4.7μF ceramic capacitor.

22

IN

Supply Voltage Connection. Connect IN to a 5V to 28V input supply.

23

PGND

Power Ground. Source connection for the low-side MOSFET. Connect VDD’s bypass capacitor returns to

PGND.

24

DL2 Low-Side Gate Driver Output 2. Gate driver for the synchronous MOSFET.

25

LX2

External Inductor Connection and Source Connection for the High-Side MOSFET for Output 2. Also serves

as the return terminal for the high-side MOSFET driver.

26

DH2 High-Side Gate Driver Output 2. DH2 drives the gate of the high-side MOSFET.

27

BST2 Boost Flying-Capacitor Connection. Reservoir capacitor connection for the high-side MOSFET driver

supply. Connect a 0.47μF ceramic capacitor between BST2 and LX2.

28

EN2

Output 2 Enable. A logic-low shuts down channel 2’s MOSFET drivers. EN2 can be used for output

sequencing.

—

EP

Exposed Pad. Connect exposed pad to ground plane (MAX15034BAUI only).

Detailed Description

The MAX15034 switching power-supply controller can

be configured two ways. With the MODE input high, this

device operates as single-output, dual-phase, step-

down switching regulators where each output is 180°

out of phase. With MODE connected low, the

MAX15034 operates as a dual-output, step-down

switching regulator. The average current-mode control

topology of the MAX15034 offers high-noise immunity

while having benefits similar to those of peak current-

mode control. Average current-mode control has the

intrinsic ability to accurately limit the average current

sourced by the converter during a fault condition. When

a fault condition occurs, the error-amplifier output volt-

age (EAOUT1 or EAOUT2) that connects to the positive

input of the transconductance amplifier (CA1 or CA2) is

clamped, thus limiting the output current.

The MAX15034 has internal logic to ensure each output’s

monotonic startup under prebias load conditions. This

facilitates glitch-free output voltage power-up in the pres-

ence of another redundant/parallel voltage regulator.

The MAX15034 contains all blocks necessary for two

independently regulated average current-mode PWM

regulators. This device has two voltage error amplifiers

(VEA1 and VEA2), two current-error amplifiers (CEA1

and CEA2), two current-sensing amplifiers (CA1 and

CA2), two PWM comparators (CPWM1 and CPWM2),

and drivers for both low- and high-side power MOSFETs

(see Figure 1). Each PWM section is also equipped with

a pulse-by-pulse, current-limit protection and a fault

integration block for hiccup protection.

10 ______________________________________________________________________________________

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