MAX1714AEEP Ver la hoja de datos (PDF) - Maxim Integrated

Número de pieza

componentes Descripción

fabricante

MAX1714AEEP

High-Speed Step-Down Controller for Notebook Computers

Maxim Integrated 

High-Speed Step-Down Controller

for Notebook Computers

Pin Description

PIN PIN

MAX1714A MAX1714B

1

1

2, 9,

11

–

NAME

DH

N.C.

3

2

SHDN

4

3

FB

5

4

OUT

6

5

ILIM

7

6

REF

8

–

AGND

10

7

PGOOD

–

8

GND

12

–

PGND

13

9

DL

14

10

VDD

15

11

VCC

16

12

TON

17

13

V+

18

14

SKIP

19

15

BST

20

16

LX

FUNCTION

High-Side Gate Driver Output. Swings from LX to BST.

No Connection. These pins are not connected to any internal circuitry. Connect N.C. pins

to the ground plane to enhance thermal conductivity.

Shutdown Control Input. Drive SHDN to AGND to force the MAX1714 into shutdown. Drive

or connect to VCC for normal operation. A rising edge on SHDN clears the fault latch.

Feedback Input. Connect to AGND for a +2.5V fixed output or to VCC for a +3.3V fixed

output, or connect FB to a resistor divider from OUT for an adjustable output.

Output Voltage Connection. Connect directly to the junction of the external and output fil-

ter capacitors. OUT senses the output voltage to determine the on-time and also serves

as the feedback input in fixed-output modes.

Current-Limit Threshold Adjustment. Connect ILIM to VCC for 100mV current-limit threshold.

For an adjustable threshold, connect an external voltage source to ILIM, or use a two-resis-

tor divider from REF to AGND. The external adjustment range of 0.5V to 2.0V corresponds to

a current-limit threshold of 50mV to 200mV.

+2.0V Reference Voltage Output. Bypass to AGND with 0.22µF (minimum) capacitor. Can

supply 50µA for external loads.

Analog Ground.

Power-Good Open-Drain Output. PGOOD is low when the output voltage is more than 6%

below the normal regulation point or during soft-start. PGOOD is high impedance when

the output is in regulation and the soft-start circuit has terminated.

Analog and Power Ground. AGND and PGND connect together internally.

Power Ground. Connect directly to the low-side MOSFET’s source. Serves as the negative

input of the current-limit comparator.

Low-Side Gate-Driver Output. Swings from PGND to VDD.

Supply Input for the DL Gate Drive. Connect to the system supply voltage, +4.5V to +5.5V.

Bypass to PGND with a 1µF (min) ceramic capacitor.

Analog-Supply Input. Connect to the system supply voltage, +4.5V to +5.5V, with a series

20Ω resistor. Bypass to AGND with a 1µF (min) ceramic capacitor.

On-Time Selection-Control Input. This is a four-level input used to determine DH on-time.

Connect to AGND, REF, or VCC, or leave TON unconnected to set the following switching

frequencies: AGND = 600kHz, REF = 450kHz, floating = 300kHz, and VCC = 200kHz.

Battery Voltage Sense Connection. Connect to input power source. V+ is used only to set

the PWM one-shot timing.

Pulse-Skipping Control Input. Connect to VCC for low-noise forced-PWM mode. Connect

to AGND to enable pulse-skipping operation.

Boost Flying-Capacitor Connection. Connect to an external capacitor and diode according

to the Standard Application Circuit (Figure 1). See MOSFET Gate Drivers (DH, DL) section.

External Inductor Connection. Connect LX to the switched side of the inductor. LX serves

as the lower supply rail for the DH high-side gate driver. LX is also the positive input to the

current-limit comparator.

8 _______________________________________________________________________________________

Share Link: