EV0034 Просмотр технического описания (PDF) - Monolithic Power Systems

Номер в каталоге

Компоненты Описание

производитель

EV0034

2A, 1.3MHz Step-Up Converter

Monolithic Power Systems 

Monolithic Power Systems

Pin Descriptions

NC 1

NC 2

IN 3

SW 4

PGND 5

SGND 6

FAULT 7

14 SGND

13 EN

12 BP

11 NC

10 COMP

9 FB

8 SS

MP1527

2A, 1.3MHz

Step-Up Converter

COMP 1

NC 2

BP 3

EN 4

Top

View

12 PGND

11 PGND

10 SW

9 SW

Table 1: Pin Description

QFN

Pin

1

2, 6, 7

TSSOP

Pin

10

1, 2, 11

Name Function

COMP

NC

Compensation Node. COMP is the output of the internal transconductance error

amplifier. Connect a series RC network from COMP to SGND to compensate the

regulator control loop.

No Connect

3

4

5, 13

8

9, 10

11, 12

14

15

16

12

13

6, 14

3

4

5

7

8

9

BP

Output of the internal 2.4V low dropout regulator. Connect a 10nF bypass

capacitor between BP and SGND. Do not apply an external load to BP.

EN

Regulator On/Off Control Input. A logic high input (VEN>1.5V) turns on the

regulator, a logic low puts the MP1527 into low current shutdown mode.

SGND Signal Ground

IN

SW

PGND

Input Supply

Output Switching Node. SW is the drain of the internal n-channel MOSFET.

Connect the inductor and rectifier to SW to complete the step-up converter.

Power Ground

FAULT

SS

FB

Fault Input/Output. FAULT is an Input/Output that indicates that the MP1527

detected a fault and shuts the regulator off once a fault is indicated. Connect the

FAULT input/outputs together for all MP1527 regulators to force all regulators off

when any one regulator detects a fault. Once a fault is detected, cycle EN or the

input power to restart the regulator. Pull FAULT to the input voltage through a

100kΩ resistor. Up to 20 FAULT input/outputs can be connected in parallel.

Soft-Start Input. Connect a 10nF to 22nF capacitor from SS to SGND to set the

soft-start and fault timer periods. SS sources 2µA to an external soft-start

capacitor during start-up and when a fault is detected. As the voltage at SS

increases to 1.2V, the voltage at COMP is clamped to 0.7V above the voltage at

SS limiting the startup current. Under a fault condition, SS ramps at the same rate

as in soft-start. When the voltage at SS reaches 1.2V, FAULT is asserted and the

regulator is disabled. The external capacitor at SS is discharged to ground when

not in use or when under voltage lockout or thermal shutdown occurs.

Regulation Feedback Input. Connect to external resistive voltage divider from the

output voltage to FB to set output voltage.

MP1527 Rev 1.8_8/31/05

Monolithic Power Systems, Inc.

3

Share Link: