Max1759 buck/boost regulating charge pump in µmax, Typical operating characteristics – Rainbow Electronics MAX1759 User Manual
Page 4
MAX1759
Buck/Boost Regulating
Charge Pump in µMAX
4
_______________________________________________________________________________________
Typical Operating Characteristics
(Circuit of Figure 1, C
IN
= 10µF, C
X
= 0.33µF, C
OUT
= 10µF, V
OUT
= 3.3V, V
IN
= 2.5V, T
A
= +25°C, unless otherwise noted.)
0
20
60
40
80
100
1.5
2.5
3.5
4.5
5.5
OUTPUT VOLTAGE RIPPLE
vs. INPUT VOLTAGE
MAX1759 toc01
INPUT VOLTAGE (V)
OUTPUT VOLTAGE RIPPLE (mV)
I
OUT
= 10mA
I
OUT
= 50mA
I
OUT
= 100mA
OUTPUT VOLTAGE vs. LOAD CURRENT
MAX1759 toc02
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
3.40
3.20
3.25
3.30
3.35
0.001
1
10
100
0.01
0.1
1000
0
20
10
40
30
60
50
70
90
80
100
1.5
2.5
3.5
4.5
5.5
EFFICIENCY vs. INPUT VOLTAGE
MAX1759 toc03
INPUT VOLTAGE (V)
EFFICIENCY (%)
I
OUT
= 10mA
I
OUT
= 50mA
I
OUT
= 100mA
0.5
1.5
2.5
3.5
4.5
5.5
QUIESCENT CURRENT
vs. INPUT VOLTAGE
MAX1759 toc04
INPUT VOLTAGE (V)
QUIESCENT CURRENT (
µ
A)
10,000
1
10
100
1000
NO LOAD
4
3
2
1
0
0.5
2.5
1.5
3.5
4.5
5.5
STARTUP INPUT VOLTAGE
(V
OUT
< V
IN
)
MAX1759 toc05
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
R
LOAD
= 33
Ω
1
3
2
5
µs/div
TYPICAL SWITCHING WAVEFORMS
(V
OUT
< V
IN
)
MAX1759 toc06
CH1: V
OUT
, 20mV/div, AC-COUPLED
CH2: V
CXP
, 5V/div
CH3: V
IN
, 50mV/div, AC-COUPLED
R
LOAD
= 33
Ω
V
IN
= 4.2V
1
3
2
5
µs/div
TYPICAL SWITCHING WAVEFORMS
(V
OUT
> V
IN
)
MAX1759 toc07
CH1: V
OUT
, 20mV/div, AC-COUPLED
CH2: V
CXP
, 5V/div
CH3: V
IN
, 50mV/div, AC-COUPLED
R
LOAD
= 33
Ω
V
IN
= 2.5V
1
2
100
µs/div
LOAD-TRANSIENT RESPONSE
(V
OUT
< V
IN
)
MAX1759 toc08
CH1: V
OUT
, 20mV/div, AC-COUPLED
CH2: I
OUT
, 100mA/div
LOAD STEP: 10mA TO 100mA
V
IN
= 4.2V
1
2
100
µs/div
LOAD-TRANSIENT RESPONSE
(V
OUT
> V
IN
)
MAX1759 toc09
CH1: V
OUT
, 20mV/div, AC-COUPLED
CH2: I
OUT
, 100mA/div
LOAD STEP: 10mA TO 100mA
V
IN
= 2.5V