Rainbow Electronics MAX742 - Manual (Page 4)

MAX742
Switch-Mode Regulator with
+5V to ±12V or ±15V Dual Output
4 _______________________________________________________________________________________
__________________________________________Typical Operating Characteristics
(Circuit of Figure 2, V+ = 5V, T
A
= +25°C, unless otherwise noted.)
25
0 6
UNDERVOLTAGE LOCKOUT HYSTERESIS
5
10
20
MAX742 -1
SUPPLY VOLTAGE (V)
QUIESCENT SUPPLY CURRENT (mA)
15
4 2 3 5 1
±15V MODE,
200kHz MODE
LOCKOUT
ENABLED
-4.5
0
CHARGE-PUMP LOAD REGULATION
-2.5
-5.0
-3.0
-4.0
MAX742 -2
CHARGE-PUMP LOAD CURRENT (mA)
CHARGE-PUMP OUTPUT VOLTAGE (V)
-3.5
4 2 3 7 5 6 10 8 9 1
MEASURED AT POINT A
V+ = 5V
V+ = 4.5V
5
0
PDRV CURRENT vs. C EXT-
1
6
2
4
MAX742 -3
CAPACITANCE AT EXT- (nF)
PDRV CURRENT (mA)
3
4 2 3 1
PDRV FORCED TO -4V
PUMP DISCONNECTED
200kHz
100kHz
50
0
EFFICIENCY vs. LOAD CURRENT,
22W CIRCUIT, ±15V MODE
60
70
90
MAX742 -4
LOAD CURRENT (mA)
EFFICIENCY (%)
80
±800 ±400 ±600 ±1000 ±200
100kHz
200kHz
CIRCUIT OF FIGURE 3,
INDUCTORS = GOWANDA 121-AT2502
(MPP CORE),
Q2 = TWO IRF9Z30 IN PARALLEL
±15V MODE
0
PEAK INDUCTOR CURRENT vs.
LOAD CURRENT
100
200
400
MAX742 -7
LOAD CURRENT (mA)
PEAK INDUCTOR CURRENT (mA)
300
500
700
600
800
1000
900
1100
1200
200 100 150 50
100kHz
200kHz
MEASURED AT LX-,
±15V MODE
50
0
EFFICIENCY vs. LOAD CURRENT,
6W CIRCUIT, ±15V MODE
60
70
90
MAX742 -5
LOAD CURRENT (mA)
EFFICIENCY (%)
80
±200 ±100 ±150 ±250 ±50
100kHz
200kHz
INDUCTORS = GOWANDA 050-AT1003
(MPP CORE)
50
0
EFFICIENCY vs. LOAD CURRENT,
6W CIRCUIT, ±12V MODE
60
70
90
MAX742 -6
LOAD CURRENT (mA)
EFFICIENCY (%)
80
±300 ±150 ±225 ±75
100kHz
200kHz
INDUCTORS = GOWANDA 050-AT1003
(MPP CORE)
0
CURRENT-LIMIT THRESHOLD vs.
SOFT-START VOLTAGE
50
100
200
MAX742 -8
SOFT-START VOLTAGE (V)
CURRENT-LIMIT THRESHOLD (mV)
150
3 1 2