MAX1705 Maxim, MAX1705 Datasheet - Page 8

• Manufacturer Part Number: MAX1705
• Description: 1- to 3-Cell / High-Current / Low-Noise / Step-Up DC-DC Converters with Linear Regulator
• Manufacturer: Maxim

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