CDH2D09 View Datasheet(PDF) - Maxim Integrated
Part Name
Description
MFG CO.
'CDH2D09' PDF : 44 Pages View PDF
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
100
90
80
PWM = 0
70
VOUT1 = 2.8V
60
50
40
30
PWM = 1
20
VOUT1 = 2.8V
10
0
1
VBATT = 4V
10
100
1000
LOAD CURRENT (mA)
2.900
2.880
2.860
2.840
2.820
2.800
2.780
2.760
2.740
2.720
2.700
0
REG1 LOAD REGULATION
RFBH = 182kΩ
RFBL = 100kΩ
50 100 150 200 250
OUTPUT CURRENT (mA)
REG1 DROPOUT VOLTAGE
vs. LOAD CURRENT
200
THE NOMINAL INDUCTOR DC RESISTANCE
180 IS 140mΩ. THE NOMINAL p-CHANNEL
160 RESISTANCE OF THE REGULATOR IS
200mΩ AT 2.8V AND 185mΩ AT 3.3V.
140 THE SLOPE OF THE LINE SHOWS
120
THAT THE TOTAL DROPOUT
RESISTANCE OF AN AVERAGE
100 PART, BOARD, INDUCTOR
COMBINATION IS
80 330mΩ AT 3.3V
VOUT1 = 3.3V
60 AND 354mΩ
AT 2.8V.
40
VOUT1 = 2.8V
SYS IS 100mV BELOW THE
20
REG1 NOMINAL REGULATION
VOLTAGE.
0
0
100 200 300 400 500
OUTPUT CURRENT (mA)
REG1 LIGHT-LOAD SWITCHING
WAVEFORMS (PWM = 0)
MAX8671X toc26
REG1 LIGHT-LOAD SWITCHING
WAVEFORMS (PWM = 1)
MAX8671X toc27
REG1 HEAVY-LOAD SWITCHING
WAVEFORMS
MAX8671X toc28
VOUT1
20mV/div
VOUT1
(AC-COUPLED)
VOUT1
10mV/div
10mV/div
(AC-COUPLED)
VLX1
ILI
20mA LOAD
4μs/div
2V/div
VLX1
0
200mA/div
0
ILI
20mA LOAD
200ns/div
2V/div VLX1
0
100mA/div
ILI
0
20mA LOAD
400ns/div
2V/div
0
100mA/div
0
REG1 LINE TRANSIENT
MAX8671X toc29
5.3V
3.3V
VSYS
3.3V
2V/div
REG1 LOAD TRANSIENT
MAX8671X toc30
VOUT1
250mA
50mV/div
(AC-COUPLED)
VOUT1
20mV/div
100μs/div
25mA LOAD
IOUT1 25mA
25mA
100mA/div
20μs/div
______________________________________________________________________________________ 17
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