MAX1565 Datasheet, PDF (7/26 Pages) Maxim Integrated Products – Small, High-Efficiency, Five-Channel Digital Still Camera Power Supply

Small, High-Efficiency, Five-Channel
Digital Still Camera Power Supply
Typical Operating Characteristics (continued)
(Circuit of Figure 1, T_A = +25°C, unless otherwise noted.)
BUCK-BOOST EFFICIENCY
vs. LOAD CURRENT
(1.5V OUTPUT, V_OUTSU = 3.3V)
100
BUCK-BOOST EFFICIENCY
vs. LOAD CURRENT
(3.3V OUTPUT, V_OUTSU = 5V)
100
BUCK-BOOST EFFICIENCY
vs. INPUT VOLTAGE
(1.5V OUTPUT, V_OUTSU = 3.3V)
100
90
90
90
80
70 VIN = 3V
60
V_IN = 2V
V_IN = 1.5V
50
40
30
20
10
V_OUTSD = 1.5V
V_OUTSU = 3.3V
0
1
10
100
1000
LOAD CURRENT (mA)
BUCK-BOOST EFFICIENCY
vs. INPUT VOLTAGE
(3.3V OUTPUT, V_OUTSU = 5V)
100
I_OUTSD = 250mA
90
80
70
60
50
V_IN = 4.2V
40 V_IN = 3.6V
30
V_IN = 3V
V_IN = 2V
20 V_IN = 1.5V
10
0
1
V_OUTSD = 3.3V
V_OUTSU = 5V
10
100
1000
LOAD CURRENT (mA)
BOOST AND BUCK-BOOST COMBINED
EFFICIENCY vs. INPUT VOLTAGE
100
80
70 ^IOUTSD ^{= 250mA}
I_OUTSD = 500mA
60 _{IOUTSD = 100mA}
50
40
30
20
10
V_OUTSD = 1.5V
V_OUTSU = 3.3V
0
1.5 2.0 2.5 3.0 3.5 4.0
INPUT VOLTAGE (V)
AUX_ EFFICIENCY vs. LOAD CURRENT
(5V OUTPUT)
100
90
80
90
80
70
I_OUTSD = 500mA ^IOUTSD ^{= 100mA}
60
80
50
40
70
70 _{VIN = 3.6V}
60 V_IN = 3V
50
V_IN = 2V
V_IN = 1.5V
40
30
20
10
V_OUTSD = 3.3V
V_OUTSU = 5V
0
1.5 2.0 2.5 3.0 3.5 4.0 4.5
INPUT VOLTAGE (V)
60
V_OUTSU = 3.3V, 200mA
V_OUTSD = 1.5V, 200mA
EFF% = [(V_SUI_SU) + (V_SDI_SD)]/(V_INI_IN)
50
1.0 1.5 2.0 2.5 3.0 3.5
INPUT VOLTAGE (V)
30
20
10
0
1
V_{OUTAUX_} = 5V
10
100
1000
LOAD CURRENT (mA)
NO-LOAD INPUT CURRENT
vs. INPUT VOLTAGE (SWITCHING)
3.5
3.0
BUCK-BOOST
(STEP-UP AND STEP DOWN)
2.5
MINIMUM STARTUP VOLTAGE
vs. LOAD CURRENT (OUTSU)
3.5
WITHOUT SCHOTTKY*
3.0
2.5
WITH SCHOTTKY*
2.0
2.0
STEP-UP
1.5
1.5
1.0
1.0
0.5 V_OUTSD = 1.5V
0.5 *SCHOTTKY DIODE CONNECTED
V_OUTSU = 5V
FROM IN TO OUTSU
0
0
1
2
3
4
5
0
300
600
900
1200
INPUT VOLTAGE (V)
LOAD CURRENT (mA)
_______________________________________________________________________________________ 7