MAX1920 Maxim, MAX1920 Datasheet - Page 4

• Manufacturer Part Number: MAX1920
• Description: PLASTIC ENCAPSULATED DEVICES
• Manufacturer: Maxim

Low-Voltage, 400mA Step-Down
DC-DC Converters in SOT23
(C
4
10,000
IN
1000
100
_______________________________________________________________________________________
10
= 2.2µF ceramic, Circuit of Figure 1, components of Table 1, unless otherwise noted.)
1
0.1
V
I
LIGHT-LOAD SWITCHING WAVEFORM
V
V
LOAD
IN
IN
OUT
SWITCHING FREQUENCY vs. LOAD
= 3.3V, V
= 3.8V to 4.2V,
= 40mA
LINE-TRANSIENT RESPONSE
= 1.5V, I
1
OUT
LOAD
MEDIUM-LOAD
(V
= 1.5V,
OUT
LOAD (mA)
= 250mA
1µs/div
4µs/div
10
= 1.8V)
100
V
IN
MAX1920 toc10
MAX1920 toc13
= 3.3
1000
V
AC-COUPLED
5mV/div
V
2V/div
V
AC-COUPLED
200mV/div
V
AC-COUPLED
5mV/div
OUT
LX
IN
OUT
10,000
1000
100
Typical Operating Characteristics (continued)
10
1
0.1
MEDIUM-LOAD SWITCHING WAVEFORM
V
I
V
V
LOAD
IN
IN
OUT
SWITCHING FREQUENCY vs. LOAD
= 3.3V, V
= 3.8V to 4.2V,
= 1.5V, I
= 250mA
LINE-TRANSIENT RESPONSE
1
OUT
LOAD
(V
LIGHT-LOAD
= 1.5V,
OUT
LOAD (mA)
= 20mA
4µs/div
1µs/div
10
= 1.5V)
100
V
MAX1920 toc11
MAX1920 toc14
IN
= 3.3
1000
V
AC-COUPLED
5mV/div
V
2V/div
V
AC-COUPLED
200mV/div
V
AC-COUPLED
5mV/div
OUT
LX
IN
OUT
10,000
1000
100
10
1
1.5
SOFT-START AND SHUTDOWN RESPONSE
V
I
LOAD
IN
2.0
= 3.3V, V
NO LOAD SUPPLY CURRENT
LOAD-TRANSIENT RESPONSE
= 20mA TO 320mA
V
R
vs. SUPPLY VOLTAGE
2.5
IN
LOAD
SUPPLY VOLTAGE (V)
= 3.3V, V
OUT
V
V
OUT
3.0
= 6Ω
OUT
= 1.5V,
200µs/div
= 1.5V
40µs/div
= 2.5V
3.5
OUT
V
= 1.5V,
OUT
4.0
= 3.3V
4.5
MAX1920 toc12
MAX1920 toc15
5..0
5.5
V
1V/div
I
100mA/div
V
5V/div
V
AC-COUPLED
100mV/div
I
200mA/div
I
200mA/div
IN
L
LOAD
OUT
SHDN
OUT