MAX8668 Maxim Integrated Products, MAX8668 Datasheet - Page 5

• Manufacturer Part Number: MAX8668
• Description: (MAX8667 / MAX8668) First Dual Step-Down DC-DC Converters
• Manufacturer: Maxim Integrated Products

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(V
IN12
120
100
80
60
40
20
0
NO-LOAD SUPPLY CURRENT vs. SUPPLY
0
= V
VOLTAGE OUT3 AND OUT4 ONLY
IN34
V
FALLING
IN34
1
= 3.6V, circuit of Figure 4, V
VOLTAGE
1.5MHz Dual Step-Down DC-DC Converters
SUPPLY VOLTAGE (V)
EN1/EN2/
EN3/EN4
1000
2
V
V
V
V
900
800
700
600
500
400
300
200
100
OUT2
OUT3
OUT4
OUT1
0
V
RISING
_______________________________________________________________________________________
IN34
2.5
SUPPLY CURRENT vs. SUPPLY VOLTAGE
3
VOLTAGE
with Dual LDOs and Individual Enables
3.0
SHUTDOWN WAVEFORMS
V
4
IN12
SUPPLY VOLTAGE (V)
3.5
= 5.5V
5
40μs/div
4.0
IN12 = IN34
2.4Ω LOAD ON OUT1
3.6Ω LOAD ON OUT2
NO LOAD ON OUT3
NO LOAD ON OUT4
OUT1
4.5
= 1.2V, V
3.00
2.95
2.90
2.85
2.80
2.75
2.70
2.65
2.60
2.55
2.50
MAX8667/88 toc15
Typical Operating Characteristics (continued)
5.0
2.5
vs. INPUT VOLTAGE (300mA LOAD)
5.5
OUT2
3.0
5V/div
1V/div
1V/div
1V/div
1V/div
OUT3 OUTPUT VOLTAGE
= 1.8V, V
INPUT VOLTAGE (V)
3.5
4.0
OUT3
I
IN12
EN1/EN2/
4.5
EN3/EN4
= 2.8V, V
+ I
V
V
V
V
I
V
OUT1
OUT1
OUT2
OUT3
OUT4
OUT1
IN34
I
I
L1
I
L2
L1
5.0
10mA
OUT4
5.5
OUT1 LOAD TRANSIENT
ENABLE WAVEFORMS
= 2.8V, T
300mA
10μs/div
80
70
60
50
40
30
20
10
40μs/div
0
0
A
= +25°C, unless otherwise noted.)
OUT3 DROPOUT VOLTAGE
10mA
MAX8667/88 toc16
MAX8667/88 toc14
vs. LOAD CURRENT
LOAD CURRENT (mA)
100
100mV/div
(AC-COUPLED)
200mA/div
200mA/div
5V/div
2V/div
2V/div
2V/div
2V/div
2A/div
2A/div
2A/div
200
300
5