MAX1765EUE+【PDF 9/19 页】IC REG DL BST/LINEAR 16TSSOP

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Sheet目录42

5页 6页 7页 8页 [9页]10页 11页 12页 13页

800mA, Low-Noise, Step-Up DC-DC Converter

with 500mA Linear Regulator

_______________________________________________________________________________________ 9

PIN NAME

FUNCTION

FBL

Low-Dropout Linear Regulator Dual-Mode Feedback Input. Connect FBL to ground for 2.85V nominal

output voltage. Connect FBL to a resistor-divider from OUTL to ground for an adjustable output voltage.

FBL regulates to 1.25V.

ISET

Set N-Channel Current Limit. For maximum current limit, connect ISET to REF. To reduce current limit,

use a resistor-divider from REF to GND. If soft-start is desired, a capacitor can be added from ISET to

GND. When ONA = LO and ONB = HI or V

REF

< 80% of nominal value, an on-chip 100k?switchable

resistor discharges ISET to GND.

REF

1.25V Reference Output. Connect a 0.22礔 bypass capacitor to GND; 50礎 of external load current is

allowed. The reference is enabled if ONA = HI, ONB = LO, or ONL = HI.

GND Ground. Connect to PGND with short trace.

Boost Converter Feedback Input. Connect a resistor-divider between OUT and GND to set the output

voltage in the range of 2.5V to 5V. In track mode, FB is disabled after OUTL is in regulation.

OUT

Boost Converter IC power is derived from OUT. Connect OUT to POUT through a 4.7?resistor and

bypass to GND with a 0.68礔 capacitor.

ONA ON Input. When high, the DC-DC is operational (Table 2).

8 CLK/SEL

CLOCK Input for the DC-DC Converter. Also serves to program operating mode of switch as follows:

CLK/SEL = LOW: Normal mode. Operates at a fixed frequency, automatically switching to low-power

(SKIP) mode when the load is minimized.

CLK/SEL = HI: Forced PWM mode. Operates in low-noise, constant-frequency mode at all loads.

CLK/SEL = Clocked: Synchronized forced PWM mode. The internal oscillator is synchronized to an

external clock in the 500kHz to 1200kHz frequency range.

Pin Description

0.4

0.2

0.8

0.6

1.2

1.0

1.4

0.4 0.6

0.2

0.8 1.0 1.2 1.4

SWITCH CURRENT LIMIT vs. V

ISET

(V)

OUT

= +3.3

Typical Operating Characteristics (continued)

= +25癈, unless otherwise noted.)

LIGHT-LOAD SWITCHING WAVEFORMS

= +2.4V, V

OUT

= +3.3V, I

OUT

= 10mA)

MAX1765 toc17

A: LX NODE, 5V/div

B: INDUCTOR CURRENT, 200mA/div, AC-COUPLED

C: OUTPUT RIPPLE, 20mV/div, AC-COUPLED

500ns/div

450

0.1

LINEAR-REGULATOR OUTPUT NOISE

FREQUENCY (MHz)

150

250

350

LDO

= 200mA

LDO

= 2.85V

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