MAX1878 datasheet(6/12 Pages) MAXIM

Part #	MAX1878

Description	Dual-Output Step-Down and LCD Step-Up Power Supply for PDAs

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Manufacturer	MAXIM [Maxim Integrated Products]

Direct Link	https://www.maximintegrated.com/en.html

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6 / 12 page

Dual-Output Step-Down and LCD Step-Up

Power Supply for PDAs

6

_______________________________________________________________________________________

Typical Operating Characteristics (continued)

(VIN = VAIN = 2.5V, circuit of Figure 1, TA = +25°C, unless otherwise noted.)

STEP-UP HEAVY-LOAD

SWITCHING WAVEFORMS

MAX1878 toc13

VLXLCD

10V/div

0

VOUT

AC-COUPLED

100mV/div

1

μs/div

ILCD = 4.5mA, VLCD = +18V, VIN = +2.5V, ON = PGND

STEP-DOWN LOAD

TRANSIENT RESPONSE

MAX1878 toc14

VLX

2V/div

IMAIN

200mA/div

VMAIN

AC-COUPLED

100mV/div

10

μs/div

IMAIN = 10mA to 250mA, VMAIN = +1.8V,

VIN = +2.5V, ONLCD = PGNDLCD

STEP-UP LOAD

TRANSIENT RESPONSE

MAX1878 toc15

VLXLCD

10V/div

ILCD

2mA/div

VLCD

AC-COUPLED

200mV/div

20

μs/div

ILCD = 1mA to 4mA, VLCD = +18V, VIN = +2.5V, ON = PGND

LINE TRANSIENT RESPONSE

MAX1878 toc16

VIN

3V TO 2V

VLCD

AC-COUPLED

200mV/div

VMAIN

AC-COUPLED

20mV/div

100

μs/div

VMAIN = +1.8V, IMAIN = 150mA, VLCD =18.0V, ILCD = 2.5mA

SOFT-START AND SHUTDOWN RESPONSE

MAX1878 toc17

IIN

200mA/div

VLCD

10V/div

VMAIN

1V/div

VON = VONLCD

5V/div

400

μs/div

RMAIN = 5.1

Ω, RLCD = 9.09kΩ

STEP-DOWN LIGHT-LOAD

SWITCHING WAVEFORMS

MAX1878 toc10

VLX

1V/div

0

VMAIN

AC-COUPLED

50mV/div

4

μs/div

IMAIN = 20mA, VMAIN = +1.8V, VIN = +2.5V, ONLCD = PGNDLCD

STEP-DOWN HEAVY-LOAD

SWITCHING WAVEFORMS

MAX1878 toc11

VLX

1V/div

0

VMAIN

AC-COUPLED

20mV/div

1

μs/div

IMAIN = 250mA, VMAIN = +1.8V, VIN = +2.5V, ONLCD = PGNDLCD

STEP-UP LIGHT-LOAD

SWITCHING WAVEFORMS

MAX1878 toc12

VLXLCD

10V/div

0

VOUT

AC-COUPLED

100mV/div

1

μs/div

ILCD = 2mA, VLCD = +18V, VIN = +2.5V, ON = PGND

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