MAX188 datasheet(8/32 Pages) MAXIM

8 / 32 page

Triple-Output TFT LCD Power Supply

with Fault Protection

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Typical Operating Characteristics (continued)

(Circuit of Figure 1, VIN = +3.3V, VMAIN = +9V, VPL = +20V, VNL = -7V, SHDN = FREQ = IN, PGND = GND, TA = +25°C, unless

otherwise noted.)

100

0.1

POSITIVE CHARGE-PUMP INCREMENTAL

EFFICIENCY vs. LOAD CURRENT

LOAD CURRENT (mA)

EFF = (VOUT ✕ IOUT) /

(PIN(LOAD) - PIN(NOLOAD))

-8.2

-8.7

0.1

NEGATIVE CHARGE-PUMP

OUTPUT VOLTAGE vs. LOAD CURRENT

-8.6

LOAD CURRENT (mA)

-8.5

-8.4

-8.3

VIN = 3.3V

IMAIN = 200mA

100

0.1

NEGATIVE CHARGE-PUMP INCREMENTAL

EFFICIENCY vs. LOAD CURRENT

LOAD CURRENT (mA)

EFF = (VOUT ✕ IOUT) /

(PIN(LOAD) - PIN(NOLOAD))

-0.15

-0.12

-0.09

-0.06

-0.03

0.1

POSITIVE LINEAR-REGULATOR

LOAD REGULATION

LOAD CURRENT (mA)

2ms/div

POSITIVE LINEAR-REGULATOR

LOAD-TRANSIENT RESPONSE

19.95V

MAX1889 toc20

10mA

A: VPL = 20V, 50mV/div, AC-COUPLED

B: IPL = 0 TO 10mA, 10mA/div

20V

-0.40

-0.32

-0.16

-0.24

0.1

NEGATIVE LINEAR-REGULATOR

LOAD REGULATION

LOAD CURRENT (mA)

-0.08

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