MAX781CBX 데이터 시트보기 (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.)
3OUT OPERATE MODE POWER EFFICIENCY
VARIABLE SWITCHING FREQUENCY
100
450
BATT = 7.5V
90 SYNC = AGND
400
80 IDLE = 1
350
MODE1 = 1
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)
USING THE BATTERY CHARGER TO DRIVE
A CCFL BACKLIGHT ROYER OSCILLATOR
2.5
110
SYNC = REF
100
2.0 VCHG = 7V
90
BATT = VCHG - DIODE DROP
R4 = 0.47Ω
80
1.5
70
60
mV
1.0
50
mA, rms
40
0.5
30
20
0
10
0 10 20 30 40 50 60 70
CHG6–CHG0 BITS VALUE
______________________________________________________________Pin Description
PIN
NAME
FUNCTION
1–4 GD2–GD5 High-Side Gate-Driver Outputs
5
VPPA
VPP-Programming Voltage Output A
6
VHI
VPPA, VPPB Linear-Regulator Input Power
7
VPPB
VPP-Programming Voltage Output B
8
AGND
Analog Ground
9
SYNC
Oscillator Frequency Control and Synchronization Input
10
CE
Serial-Interface Chip-Enable Input—active high
11
SCLK
Serial-Interface Clock Input
12
DOUT
Serial-Interface Data Output
13
DIN
Serial-Interface Data Input
14
INT
Interrupt Output
15
FAST
General-purpose open-drain output
16
COMP
Battery-Charger Compensation
17
CSBAT
Battery-Charger Current-Sense Input
18
5OUT
Linear-Regulated +5V Output
19
DCHG
Battery-Charger MOSFET Gate-Driver Output
20
PGND
Power Ground
21
DLO
+3.3V Regulator, Synchronous Rectifier, Gate-Driver Output
22
BST
+3.3V Regulator Boost Capacitor Connection (0.1µF to LX)
23
DHI
+3.3V Regulator High-Side Gate-Driver Output
24
LX
+3.3V Regulator Inductor Connection
_______________________________________________________________________________________ 7
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