MAX781CBX 查看數據表（PDF） - Maxim Integrated
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MAX781CBX Datasheet PDF : 24 Pages
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PDA/Hand-Held Computer Power Controller
____________________________Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
VPPA AND VPPB OUTPUT POWER
VPPA SHORTED TO VPPB AND
CLAMPED TO 11.5V
400
14.0
VHI VOLTAGE
350
13.5
300
BATT INPUT CURRENT 13.0
250
12.5
200
150
100
50
4
VPPA + VPPB CURRENT
12.0
11.5
CONFIGURATION = $FF, $00, $02, $6A,
SYNC = AGND, NO 3OUT LOAD
11.0
T1 TURNS RATIO (SECONDARY
TURNS / PRIMARY TURNS) = 3.5
10.5
6 8 10 12 14 16 18
BATT VOLTAGE (V)
DCHG DUTY CYCLE vs. COMP VOLTAGE
90
AT 0% DUTY CYCLE,
80
DCHG = 5OUT
70
60
50
40
30
20
10
0
0
0.5 1.0 1.5 2.0 2.5 3.0
COMP VOLTAGE (V)
3OUT OPERATE MODE POWER EFFICIENCY
(FIXED 300kHz SWITCHING FREQUENCY)
100
BATT = 5.5V
90 SYNC = REF
IDLE = 0
80 MODE1 = 1
70 MODE0 = 0
60
50
40
30
20
10
1
10
100
1000
3OUT OUTPUT CURRENT (mA)
3OUT OPERATE MODE POWER EFFICIENCY
(FIXED 230kHz SWITCHING FREQUENCY)
100
BATT = 5.5V
90 SYNC = AGND
80
IDLE = 0
MODE1 = 1
70 MODE0 = 0
60
50
40
30
20
10
1
10
100
1000
3OUT OUTPUT CURRENT (mA)
3OUT OPERATE MODE POWER EFFICIENCY
(VARIABLE SWITCHING FREQUENCY)
100
450
BATT = 5.5V
90 SYNC = REF
400
80
IDLE = 1
MODE1 = 1
350
70 MODE0 = 0
300
60
%
50
40
250
200
kHz
150
30
100
20
50
10
0
1
10
100
1000
3OUT OUTPUT CURRENT (mA)
3OUT OPERATE MODE POWER EFFICIENCY
(VARIABLE SWITCHING FREQUENCY)
100 BATT = 5.5V
450
90 SYNC = AGND
400
80
IDLE = 1
MODE1 = 1
350
70 MODE0 = 0
300
60
250
50
%
40
30
200
kHz
150
100
20
50
10
0
1
10
100
1000
3OUT OUTPUT CURRENT (mA)
3OUT OPERATE MODE POWER EFFICIENCY
(FIXED 300kHz SWITCHING FREQUENCY)
100
BATT = 7.5V
90 SYNC = REF
80
IDLE = 0
MODE1 = 1
70 MODE0 = 0
60
50
40
30
20
10
1
10
100
1000
3OUT OUTPUT CURRENT (mA)
3OUT OPERATE MODE POWER EFFICIENCY
(FIXED 230kHz SWITCHING FREQUENCY)
100
BATT = 7.5V
90 SYNC = AGND
80
IDLE = 0
MODE1 = 1
70 MODE0 = 0
60
50
40
30
20
10
1
10
100
3OUT OUTPUT CURRENT (mA)
1000
3OUT OPERATE MODE POWER EFFICIENCY
(VARIABLE SWITCHING FREQUENCY)
100 BATT = 7.5V
450
90 SYNC = REF
400
80
IDLE = 1
MODE1 = 1
350
70 MODE0 = 0
300
60
250
50
%
40
200
kHz
150
30
100
20
50
10
0
1
10
100
1000
3OUT OUTPUT CURRENT (mA)
6 _______________________________________________________________________________________
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