MAX1678EUA 데이터 시트보기 (PDF) - Maxim Integrated

부품명

상세내역

일치하는 목록

MAX1678EUA

1-Cell to 2-Cell, Low-Noise, High-Efficiency, Step-Up DC-DC Converter

Maxim Integrated 

1-Cell to 2-Cell, Low-Noise,

High-Efficiency, Step-Up DC-DC Converter

Typical Operating Characteristics (continued)

(Circuit of Figure 7 (Fixed Mode, 3.3V) or Figure 8 (Adjustable Mode), TA = +25°C, unless otherwise noted.)

SWITCHING WAVEFORM

LOAD-TRANSIENT RESPONSE

A

A

B

B

C

5µs/div

VOUT = 3.3V, VBATT = 1.2V, ILOAD = 10mA, COUT = 10µF,

L1 = SUMIDA CD43-470

A: LX, 2V/div B: VOUT, 50mV/div AC COUPLED

C: INDUCTOR CURRENT, 100mA/div

LINE-TRANSIENT RESPONSE

C

100µs/div

VOUT = 3.3V, VBATT = 1.2V, COUT = 10µF,

L1 = SUMIDA CD43-470,

A: VOUT, 50mV/div, AC COUPLED B: INDUCTOR CURRENT,

C: LOAD, 2mA to 12mA

100mA/div

POWER-UP RESPONSE

A

A

B

B

C

200µs/div

VOUT = 3.3V, VBATT = 1.2V, ILOAD = 10mA, COUT = 10µF,

L1 = SUMIDA CD43-470

A: VOUT, 50mV/div, AC COUPLED B: VIN, 1V/div, 1.2V to 2.2V

100µs/div

VOUT = 3.3V, VBATT = 1.2V, ILOAD = 10mA, COUT = 10µF,

L1 = SUMIDA CD43-470

A: VOUT, 1V/div B: INDUCTOR CURRENT, 100mA/div

C: SHDN, 5V/div

Pin Description

PIN NAME

FUNCTION

1

BATT Battery-Power Input

2

PFI

Power-Fail Input. When the voltage at PFI is below 614mV, PFO sinks current.

3

PFO

Open-Drain Power-Fail Output. PFO sinks current when PFI is below 614mV.

4

SHDN Active-Low Shutdown. Connect SHDN to BATT for normal operation.

5

FB

Dual-Mode Feedback Input. Connect FB to GND for fixed-output operation (3.3V). Connect FB to a feed-

back-resistor network for adjustable output voltage operation (2V to 5.5V). FB regulates to 1.23V.

6

GND Ground

7

LX

N-Channel MOSFET Switch Drain and P-Channel Synchronous-Rectifier Drain

8

OUT

Power Output and IC Power Input (bootstrapped). OUT is the feedback input for 3.3V operation. Connect

the filter capacitor close to OUT.

6 _______________________________________________________________________________________

Share Link: