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MAX8668ETEX+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
MAX8667/MAX8668
1.5MHz Dual Step-Down DC-DC Converters
with Dual LDOs and Individual Enables
4 _______________________________________________________________________________________
Typical Operating Characteristics
(V
IN12
= V
IN34
= 3.6V, circuit of Figure 4, V
OUT1
= 1.2V, V
OUT2
= 1.8V, V
OUT3
= 2.8V, V
OUT4
= 2.8V, T
A
= +25°C, unless otherwise noted.)
OUT1 EFFICIENCY vs. LOAD CURRENT
(V
OUT1
= 1.2V)
MAX8667/88 toc01
LOAD CURRENT (mA)
EFFICIENCY (%)
101
10
20
30
40
50
60
70
80
90
0
0.1 1000100
ONLY OUT1 ENABLED
OUT2 EFFICIENCY vs. LOAD CURRENT
(V
OUT2
= 1.8V)
MAX8667/88 toc02
LOAD CURRENT (mA)
EFFICIENCY (%)
1000100101
10
20
30
40
50
60
70
80
90
0
0.1 10000
ONLY OUT2 ENABLED
0.80
0.90
0.85
1.05
1.00
0.95
1.20
1.15
1.10
1.25
0 200100 300 400 500 600
OUT1 LOAD REGULATION
MAX8667/88 toc03
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
1.20
1.40
1.30
1.60
1.50
1.80
1.70
1.90
0 400 600200 800 1000 1200
OUT2 LOAD REGULATION
MAX8667/88 toc04
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
1.00
1.05
1.10
1.15
1.20
1.25
1.30
1.35
1.40
2.5 3.53.0 4.0 4.5 5.0 5.5
OUT1 OUTPUT VOLTAGE
vs. INPUT VOLTAGE (600mA LOAD)
MAX8667/88 toc05
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
1.60
1.65
1.70
1.75
1.80
1.85
1.90
1.95
2.00
2.5 3.53.0 4.0 4.5 5.0 5.5
OUT2 OUTPUT VOLTAGE
vs. INPUT VOLTAGE (1200mA LOAD)
MAX8667/88 toc06
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
0
1000
500
2000
1500
3000
2500
3500
0 600 900300 1200 1500 1800
SWITCHING FREQUENCY
vs. LOAD CURRENT
MAX8667/88 toc07
LOAD CURRENT (mA)
SWITCHING FREQUENCY (kHz)
OUT2
OUT1
0
20
40
60
80
100
120
1.5 2.52.0 3.0 3.5 4.0 4.5 5.0 5.5
NO-LOAD SUPPLY CURRENT vs. SUPPLY
VOLTAGE ALL REGULATOR ENABLED
MAX8667/88 toc08
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (µA)
SUPPLY VOLTAGE
RISING
SUPPLY VOLTAGE
FALLING
0
20
40
60
80
100
120
1.5 2.52.0 3.0 3.5 4.0 4.5 5.0 5.5
NO-LOAD SUPPLY CURRENT
vs. SUPPLY VOLTAGE OUT1 AND OUT2 ONLY
MAX8667/88 toc09
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (µA)
SUPPLY VOLTAGE
RISING
SUPPLY VOLTAGE
FALLING
MAX8667/MAX8668
1.5MHz Dual Step-Down DC-DC Converters
with Dual LDOs and Individual Enables
_______________________________________________________________________________________
5
0
40
20
80
60
100
120
012345
NO-LOAD SUPPLY CURRENT vs. SUPPLY
VOLTAGE OUT3 AND OUT4 ONLY
MAX8667/88 toc10
SUPPLY VOLTAGE (V)
I
IN34
(µA)
V
IN12
= 5.5V
V
IN34
VOLTAGE
RISING
V
IN34
VOLTAGE
FALLING
2.50
2.65
2.60
2.55
2.70
2.75
2.80
2.85
2.90
2.95
3.00
2.5 3.53.0 4.0 4.5 5.0 5.5
OUT3 OUTPUT VOLTAGE
vs. INPUT VOLTAGE (300mA LOAD)
MAX8667/88 toc11
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
0
10
20
30
40
50
60
70
80
0 100 200 300
OUT3 DROPOUT VOLTAGE
vs. LOAD CURRENT
MAX8667/88 toc12
LOAD CURRENT (mA)
DROPOUT VOLTAGE (mV)
0
300
200
100
400
500
600
700
800
900
1000
2.5 3.53.0 4.0 4.5 5.0 5.5
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX8667/88 toc13
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
IN12 = IN34
2.4Ω LOAD ON OUT1
3.6Ω LOAD ON OUT2
NO LOAD ON OUT3
NO LOAD ON OUT4
40
µs/div
ENABLE WAVEFORMS
EN1/EN2/
EN3/EN4
V
OUT1
V
OUT2
5V/div
2V/div
2V/div
2V/div
2V/div
2A/div
2A/div
2A/div
MAX8667/88 toc14
V
OUT4
I
L1
V
OUT3
I
L2
I
IN12
+ I
IN34
40µs/div
SHUTDOWN WAVEFORMS
EN1/EN2/
EN3/EN4
V
OUT1
V
OUT2
5V/div
1V/div
1V/div
1V/div
1V/div
MAX8667/88 toc15
V
OUT4
V
OUT3
Typical Operating Characteristics (continued)
(V
IN12
= V
IN34
= 3.6V, circuit of Figure 4, V
OUT1
= 1.2V, V
OUT2
= 1.8V, V
OUT3
= 2.8V, V
OUT4
= 2.8V, T
A
= +25°C, unless otherwise noted.)
10µs/div
OUT1 LOAD TRANSIENT
V
OUT1
I
OUT1
100mV/div
(AC-COUPLED)
200mA/div
200mA/div
MAX8667/88 toc16
I
L1
300mA
10mA
10mA
MAX8667/MAX8668
1.5MHz Dual Step-Down DC-DC Converters
with Dual LDOs and Individual Enables
6 _______________________________________________________________________________________
10µs/div
OUT2 LOAD TRANSIENT
V
OUT2
I
OUT2
200mV/div
(AC-COUPLED)
500mA/div
500mA/div
MAX8667/88 toc17
I
L2
600mA
10mA10mA
10µs/div
OUT3 LOAD TRANSIENT
V
OUT3
I
OUT3
50mV/div
(AC-COUPLED)
200mA/div
MAX8667/88 toc18
300mA
0mA
0mA
10µs/div
OUT4 LOAD TRANSIENT
V
OUT4
I
OUT4
50mV/div
(AC-COUPLED)
200mA/div
MAX8667/88 toc19
300mA
0mA
0mA
10µs/div
OUT1 LIGHT-LOAD SWITCHING
WAVEFORMS
V
OUT1
V
LX1
I
L1
20mV/div
MAX8667/88 toc20
2V/div
100mA/div
500µA LOAD
40µs/div
OUT2 LIGHT-LOAD SWITCHING
WAVEFORMS
V
OUT2
V
LX2
I
L2
20mV/div
MAX8667/88 toc21
2V/div
500mA/div
500µA LOAD
400ns/div
OUT1 HEAVY-LOAD SWITCHING
WAVEFORMS
V
OUT1
V
LX1
I
L1
20mV/div
MAX8667/88 toc22
2V/div
500mA/div
500mA LOAD
Typical Operating Characteristics (continued)
(V
IN12
= V
IN34
= 3.6V, circuit of Figure 4, V
OUT1
= 1.2V, V
OUT2
= 1.8V, V
OUT3
= 2.8V, V
OUT4
= 2.8V, T
A
= +25°C, unless otherwise noted.)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

MAX8668ETEX+

Mfr. #:
Buy MAX8668ETEX+
Manufacturer:
Maxim Integrated
Description:
Voltage Regulators - Switching Regulators 1.5MHz Dl Step-Down DC/DC Converte
Lifecycle:
New from this manufacturer.
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