MAX5083ATE datasheet(8/18 Pages) MAXIM

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Internal Linear Regulator (REG)

REG is the output terminal of a 5V (MAX5082), or 8V

(MAX5083) LDO which is powered from IN and provides

power to the IC. Connect REG externally to DVREG to

provide power for the high-side MOSFET gate driver.

Bypass REG to SGND with a ceramic capacitor of at least

1μF. Place the capacitor physically close to the MAX5082/

MAX5083 to provide good bypassing. During normal

operation, REG is intended for powering up only the inter-

nal circuitry and should not be used to supply power to

external loads.

Internal UVLO/External UVLO

The MAX5082/MAX5083 provides two undervoltage lock-

outs (UVLOs). An internal UVLO looks at the input voltage

(VIN) and is fixed at 4.1V (MAX5082) or 7.1V (MAX5083).

An external UVLO is sensed and programmed at the ON/

OFF pin. The external UVLO overrides the internal UVLO

when the external UVLO is higher than the internal UVLO.

During startup, before any operation begins, the input volt-

age and the voltage at ON/OFF must exceed their respec-

tive UVLOs. The external UVLO has a rising threshold

of 1.23V with 0.12V of hysteresis. Program the external

UVLO by connecting a resistive divider from IN to ON/OFF

to SGND. Connect ON/OFF to IN directly to disable the

external UVLO.

Driving ON/OFF to ground places the MAX5082/MAX5083

in shutdown. When in shutdown, the internal power

MOSFET turns off, all internal circuitry shuts down and

the quiescent supply current reduces to 200μA. Connect

an RC network from ON/OFF to SGND to set a turn-on

delay that can be used to sequence the output voltages of

multiple devices.

Figure 1. MAX5082 Simplified Block Diagram

1.23V

ON/OFF

DVREG

PCLK

LDO

REG

THERMAL

SHDN

REF

0.3V

CLK

1.23V

REGOK

VREF

ISS

>1.23V ON

<1.11V OFF

COMP

SYNC

E/A

SSA

CPWM

RAMP

LOGIC

OSC

CHARGE-PUMP

MANAGEMENT

PCLK

BST

SGND

PGND

SCLK

HIGH-SIDE

CURRENT

SENSE

REF_PFM

PFM

REF_ILIM

ILIM

OVERL

CLK

ILIM

OVERLOAD

MANAGEMENT

DVREG

C+

DVREG

C-

LEVEL

SHIFT

MAX5082

MAX5082/MAX5083

1.5A, 40V, MAXPower Step-Down

DC-DC Converters

www.maximintegrated.com

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