APW7093QA 데이터 시트보기 (PDF) - Anpec Electronics

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APW7093QA

3A, 1MHz, Step Down DC/DC Regulator

Anpec Electronics 

APW7093

Electrical Characteristics (Cont.)

(VIN=VCC=3.3V, VEXTREF=+1.1V, TA = -45 to +85oC, unless otherwise noted, Typical values are at TA =+25oC.)

Symbol

Parameter

Test Conditions

APW7093

Unit

Min Typ Max

VIL

VIH SHDN Logic Levels

0.8

V

2.0

IOUT(RMS) Maximum Output RMS Current

3.1 ARMS

Note2: The output voltage will have a DC-regulation level lower than the feedback error comparator threshold

by 50% of the ripple.

Note3: Recommended operating frequency, not production tested.

Functional Pin Description

Name

PIN (QFN)

PIN (QSOP)

FUNCTION

N.C

1,5,7,9,11,13,16,19,

25,26,28,30,32

IN

2,4

LX

3,21,22,27,29

SS

6

EXTREF

8

TOFF

10

FB

12

14,17,backside pad,

GND corner tabs

REF

15

GND

17

VCC

18

PGND

20,23,24

SHDN

31

X

No Connection, Not internally connected.

2,4

3,14,16

5

6

7

8

9

10

11

12

13,15

1

Supply Voltage Input for the internal PMOS Power Switch.

Not internally connected. Externally connect all pins for

proper operation.

Inductor Connection. Connection for the drains of the PMOS

power switch and NMOS synchronous-rectifier switch.

Connect the inductor from this node to the output filter

capacitor and load. Not internally connected. Externally

connect all pins for proper operation.

Soft-Start Connect a capacitor from SS to GND to limit inrush

current during startup.

External Reference Input Feedback input regulates to

VEXTREF. The PWM controller remains off until EXTREF is

greater than REF.

Off-Time Select Input. Sets the PMOS power switch

constant-off-time. Connect a resistor from TOFF to GND to

adjust the PMOS switch off-time.

Feedback Input. Connect directly to output for fixed-voltage

operation or to a resistive-divider for adjustable operating

modes.

Analog Ground. Connect exposed backside pad and corner

tabs to analog GND.

Reference Output. Bypass REF to GND with a 0.1µF

capacitor.

Tie to GND (pin 13 QFN; pin 9 SSOP)

Analog Supply Voltage Input. Supplies internal analog

circuitry. Bypass VCC with a 10Ω and 1µF low-pass filter. See

Figure2.

Power Ground. Internally connected to the internal NMOS

synchronous-rectifier switch.

Shutdown control Input Drive SHDN low to disable the

reference, control circuitry, and internal MOSFETs. Drive

high or connect to VCC for normal operation.

Copyright © ANPEC Electronics Corp.

5

Rev. A.5 - Jun., 2005

www.anpec.com.tw

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