Typical operating characteristics (continued) – Rainbow Electronics MAX8625A User Manual
Page 6
MAX8625A
High-Efficiency, Seamless Transition,
Step-Up/Down DC-DC Converter
6
_______________________________________________________________________________________
2ms/div
STARTUP WAVEFORMS
V
IN
= 3.6V, LOAD = 5
Ω, V
OUT
= 3.288V
MAX8625A toc16
SHDN
2V/div
V
OUT
20mV/div
I
BATT
500mA/div
I
LX
500mA/div
2ms/div
STARTUP WAVEFORMS (FIGURE 3)
V
IN
= 3.6V, LOAD = 30
Ω, V
OUT
= 1.5V
MAX8625A toc17
SHDN
2V/div
I
BATT
100mA/div
V
OUT
500mA/div
I
LX
500mA/div
400
μs/div
LOAD TRANSIENT
V
OUT
= 3.3V
MAX8625A toc18
V
OUT
100mV/div
(DC OFFSET = 3.3V)
I
LX
500mA/div
I
BATT
250mA/div
Typical Operating Characteristics (continued)
(V
IN
= 3.6V, SKIP = GND, T
A
= +25°C, Figure 4, unless otherwise noted.)
1ms/div
LINE TRANSIENT
V
OUT
= 3.3V, LOAD = 5.5
Ω,
V
IN
RAMP 3V TO 4V
MAX8625A toc19
CH1 = V
IN
500mV/div
3V OFFSET
CH2 = V
OUT
50mV/div
(AC-COUPLED)
BODE PLOT
GAIN AND PHASE vs. FREQUENCY
MAX8625A toc20
FREQUENCY (kHz)
GAIN (dB)
100
10
-50
-40
-30
-20
-10
0
10
20
30
40
-60
1
1000
V
IN
= 3.6
V
OUT
= 3.3V
LOAD = 200mA
-180
-144
-108
-72
-36
0
36
72
108
144
180
PHASE (DEG)
GAIN
PHASE
0.90
0.94
0.92
0.98
0.96
1.04
1.02
1.00
1.06
-40
0
-20
20
40
60
80
100
OSCILLATOR FREQUENCY
vs. TEMPERATURE
MAX8625A toc21
TEMPERATURE (
°C)
OSCILLATOR FREQUENCY (MHz)