Rainbow-electronics MAX1703 Manual do Utilizador descarregar pdf (Página 7)

MAX1703

1-Cell to 3-Cell, High-Power (1.5A),

Low-Noise, Step-Up DC-DC Converter

_______________________________________________________________________________________ 7

Pin Description

_________________________________Typical Operating Characteristics (continued)

= +3.6V, V

OUT

= 5V, T

= +25°C, unless otherwise noted.)

1ms/div

= 3.6V, V

OUT

= 5V, C

OUT

= 470µF,

PULSE WIDTH = 577µs, LOAD CURRENT = 100mA TO 1A

OUT

(100mV/div)

LOAD

(0.5A/div)

GSM LOAD-TRANSIENT RESPONSE

MAX1703-12

2ms/div

= 1.2V, V

OUT

= 3.3V, C

OUT

= 470µF,

PULSE WIDTH = 416µs, LOAD CURRENT = 50mA TO 400mA

OUT

(100mV/div)

LOAD

(0.2A/div)

DECT LOAD-TRANSIENT RESPONSE

MAX1703-13

Dual-Mode™ Feedback Input. Connect FB to ground to set a fixed output voltage of +5V. Connect a

divider between the output voltage and GND to set the output voltage from 2.5V to 5.5V.

FB2

Reference Output. Bypass with a 0.22µF bypass capacitor to GND.REF1

FUNCTIONNAME

DC-DC Converter Output. Power source for the IC.OUT4

Power-Good Comparator Input. Threshold is 1.250V, with 1% hysteresis on the threshold’s rising edge.POKIN3

Power-Good Comparator Output. This open-drain N-channel output is low when V

POKIN

< 1.250V.POK8

Gain-Block Output. This open-drain output sinks current when V

AIN

< V

REF

.AO7

Gain-Block Input. When AIN is low, AO sinks current. The nominal transconductance from AIN to AO is

10mmhos.

AIN6

GroundGND5

Source of P-Channel Synchronous Rectifier MOSFET Switch. Connect an external Schottky diode from LXN

and LXP to POUT.

POUT13, 15

Source of N-Channel Power MOSFET SwitchPGND10, 12

On/Off Input. When ON is low, the IC turns on.ON

Switch-Mode Selection and External-Clock Synchronization Input:

• CLK/SEL = Low: Low-power, low-quiescent-current PFM mode. Delivers up to 10% of full load current.

• CLK/SEL = High: High-power PWM mode. Full output power available. Operates in low-noise, constant-

frequency mode.

• CLK/SEL = External Clock: High-power PWM mode with the internal oscillator synchronized to the exter-

nal CLK

Turning on with CLK/SEL = 0V also serves as a soft-start function, since peak inductor current is limited to

25% of that allowed in PWM mode.

CLK/SEL9

Dual Mode is a trademark of Maxim Integrated Products.

Drain of N-Channel Power Switch. Connect LXP to LXN.LXN11

Drain of P-Channel Synchronous Rectifier. Connect LXP to LXN.LXP14

1 2 3 4 5 6 7 8 9 10 11 12 ... 15 16

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