CDH2D09 datasheet(17/44 Pages) MAXIM

17 / 44 page

PMIC with Integrated Charger and

Smart Power Selector for Handheld Devices

______________________________________________________________________________________

Typical Operating Characteristics (continued)

(Circuit of Figure 1, IVL = 0mA, TA = +25°C, unless otherwise noted.)

REG1 EFFICIENCY vs. LOAD CURRENT

LOAD CURRENT (mA)

100

1000

PWM = 0

VOUT1 = 2.8V

PWM = 1

VOUT1 = 2.8V

VBATT = 4V

2.700

2.760

2.740

2.720

2.780

2.800

2.820

2.840

2.860

2.880

2.900

100

150

200

250

REG1 LOAD REGULATION

OUTPUT CURRENT (mA)

RFBH = 182k

RFBL = 100k

μs/div

REG1 LIGHT-LOAD SWITCHING

WAVEFORMS (PWM = 0)

VOUT1

VLX1

ILI

MAX8671X toc26

200mA/div

2V/div

20mV/div

(AC-COUPLED)

20mA LOAD

200ns/div

REG1 LIGHT-LOAD SWITCHING

WAVEFORMS (PWM = 1)

VOUT1

VLX1

ILI

MAX8671X toc27

100mA/div

2V/div

10mV/div

20mA LOAD

400ns/div

REG1 HEAVY-LOAD SWITCHING

WAVEFORMS

VOUT1

VLX1

ILI

MAX8671X toc28

100mA/div

2V/div

10mV/div

(AC-COUPLED)

20mA LOAD

100

μs/div

REG1 LINE TRANSIENT

VSYS

VOUT1

MAX8671X toc29

20mV/div

2V/div

25mA LOAD

3.3V

5.3V

3.3V

μs/div

REG1 LOAD TRANSIENT

IOUT1

VOUT1

MAX8671X toc30

100mA/div

50mV/div

(AC-COUPLED)

250mA

25mA

100

120

140

160

180

200

100

300

400

500

REG1 DROPOUT VOLTAGE

vs. LOAD CURRENT

OUTPUT CURRENT (mA)

VOUT1 = 3.3V

VOUT1 = 2.8V

THE NOMINAL INDUCTOR DC RESISTANCE

IS 140m

Ω. THE NOMINAL p-CHANNEL

RESISTANCE OF THE REGULATOR IS

200m

Ω AT 2.8V AND 185mΩ AT 3.3V.

THE SLOPE OF THE LINE SHOWS

THAT THE TOTAL DROPOUT

RESISTANCE OF AN AVERAGE

PART, BOARD, INDUCTOR

COMBINATION IS

330m

Ω AT 3.3V

AND 354m

AT 2.8V.

SYS IS 100mV BELOW THE

REG1 NOMINAL REGULATION

VOLTAGE.

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