Typical operating characteristics – Rainbow Electronics MAX8884Z User Manual
Page 4
MAX8884Y/MAX8884Z
700mA DC-DC Step-Down Converters
with Dual 300mA LDO in 2mm x 2mm CSP
4
_______________________________________________________________________________________
STEP-DOWN CONVERTER EFFICIENCY
vs. LOAD CURRENT, V
OUT
= 1.8V
MAX8884Y/Z toc01
LOAD CURRENT (mA)
EFFICIENCY (%)
100
10
40
50
60
70
80
90
100
30
1
1000
MAX8884Y, V
IN
= 3.2V
= 3.6V
= 4.2V
MAX8884Z, V
IN
= 3.2V
= 3.6V
= 4.2V
STEP-DOWN CONVERTER EFFICIENCY
vs. LOAD CURRENT, V
OUT
= 1.2V
MAX8884Y/Z toc02
LOAD CURRENT (mA)
EFFICIENCY (%)
100
10
40
50
60
70
80
90
100
30
1
1000
MAX8884Y, V
IN
= 3.2V
= 3.6V
= 4.2V
MAX8884Z, V
IN
= 3.2V
= 3.6V
= 4.2V
STEP-DOWN CONVERTER NO-LOAD
SUPPLY CURRENT vs. INPUT VOLTAGE
MAX8884Y/Z toc03
INPUT VOLTAGE (V)
SUPPLY CURRENT (
μ
A)
5
4
3
2
1
50
100
150
200
250
300
0
0
6
V
BUCK_EN
= V
IN
V
LDO1_EN
= V
LDO2_EN
= 0
V
IN
FALLING
V
IN
RISING
MAX8884Y
MAX8884Z
STEP-DOWN OUTPUT VOLTAGE vs. LOAD
CURRENT (VOLTAGE POSITIONING)
MAX8884Y/Z toc04
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
100
10
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
1.0
1
1000
SEL = IN1_
SEL = AGND
MAX8884Z STEP-DOWN CONVERTER
LIGHT LOAD SWITCHING WAVEFORMS
MAX8884Y/Z toc05
400ns/div
I
LX
V
OUT
V
LX
0A
2V/div
100mA/div
AC-COUPLED
20mV/div
0V
MAX8884Y STEP-DOWN CONVERTER
LIGHT LOAD SWITCHING WAVEFORMS
MAX8884Y/Z toc06
1
μs/div
I
LX
V
OUT
V
LX
0A
2V/div
100mA/div
AC-COUPLED
10mV/div
0V
I
LOAD
= 50mA
MAX8884Z STEP-DOWN CONVERTER
HEAVY LOAD SWITCHING WAVEFORMS
MAX8884Y/Z toc07
200ns/div
I
LX
V
OUT
V
LX
0A
2V/div
500mA/div
AC-COUPLED
10mV/div
0V
I
LOAD
= 500mA
MAX8884Y STEP-DOWN CONVERTER
HEAVY LOAD SWITCHING WAVEFORMS
MAX8884Y/Z toc08
400ns/div
I
LX
V
OUT
V
LX
0A
2V/div
500mA/div
AC-COUPLED
10mV/div
0V
I
LOAD
= 500mA
Typical Operating Characteristics
(V
IN
= V
IN1A
= V
IN1B
= V
IN2
= 3.6V, V
BUCK
= 1.2V, V
LDO1
= 1.8V, V
LDO2
= 2.8V, MAX8884YEVKIT, T
A
= +25°C, unless otherwise noted.)