Typical operating characteristics (continued) – Rainbow Electronics MAX1706 User Manual
Page 8
MAX1705/MAX1706
1- to 3-Cell, High-Current, Low-Noise,
Step-Up DC-DC Converters with Linear Regulator
8
_______________________________________________________________________________________
____________________________Typical Operating Characteristics (continued)
(Circuit of Figure 2, T
A
= +25°C, unless otherwise noted.)
200
µ
s/div
MAX1705
LINE-TRANSIENT RESPONSE
MAX1705/6 TOC15
I
OUT
= 0mA, V
OUT
= 3.3V
A = V
IN
, 1.5V TO 2.0V, 200mV/div
B = V
OUT,
10mV/div, 3.3V DC OFFSET
A
B
200
µ
s/div
MAX1705
POWER-ON DELAY
(PWM MODE)
MAX1705/6 TOC17
V
IN
= 1.2V, LOAD = 1k
Ω
A = ONA, 2V/div
B = V
LDO
, 2V/div
C = V
OUT
, 2V/div
D = INDUCTOR CURRENT, 500mA/div
A
C
D
3V
2.5V
3.3V
0mA
B
1
µ
s/div
MAX1705
PWM SWITCHING WAVEFORMS
MAX1705/6 TOC18
V
IN
= 1.2V, V
OUT
= 4.5V, V
LDO
= 3.3V, I
LDO
= 200mA
A = INDUCTOR CURRENT, 500mA/div
B = LX VOLTAGE, 5V/div
C = V
OUT
RIPPLE, 50m/div AC COUPLED
D = V
LDO
RIPPLE, 5m/div AC COUPLED
C5 = 0.33
µ
F
A
B
D
C
0V
1A
V
OUT
V
LDO
2
µ
s/div
MAX1705
PFM SWITCHING WAVEFORMS
MAX1705/6 TOC19
V
IN
= 1.2V, V
OUT
= 4.5V, V
LDO
= 3.3V, I
LDO
= 40mA
A = INDUCTOR CURRENT, 500mA/div
B = LX VOLTAGE, 5V/div
C = V
OUT
RIPPLE, 50mV/div AC COUPLED
D = V
LDO
RIPPLE, 5mV/div AC COUPLED
C5 = 0.33
µ
F
A
C
D
0mA
0V
V
OUT
V
LDO
B
1ms/div
MAX1705
LINEAR-REGULATOR
OUTPUT NOISE
MAX1705/6 TOC20
V
LDO
IS AC COUPLED, 1mv/div
I
LDO
= 200mA
C5 = 0.33
µ
F
V
LDO
DC TO 500kHz
200
µ
s/div
MAX1705
LOAD-TRANSIENT RESPONSE
MAX1705/6 TOC16
V
IN
= 1.2V, V
OUT
= 3.3V
A = V
OUT
, 50mV/div, 3.3V DC OFFSET
B = I
OUT
, 0mA TO 200mA, 200mA/div
A
B