MC34270 Datasheet, PDF (4/12 Pages) Motorola, Inc – LIQUID CRYSTAL DISPLAY AND BACKLIGHT INTEGRATED CONTROLLER

MC34270 MC34271
ELECTRICAL CHARACTERISTICS (continued) (VDD = 6.0 V, for typical values TA = Low to High [Note 1], for min/max values TA is
the operating ambient temperature range that applies, unless otherwise noted.)
Characteristic
Symbol
Min
Typ
Max
Unit
AUXILIARY VOLTAGE OUTPUTS
V1, V2, V3, V4 Outputs
1–V1/V0 Ratio: MC34270
MC34271
1–V2/V0 Ratio: MC34270
MC34271
V3/V0 Ratio: MC34270
MC34271
V4/V0 Ratio: MC34270
MC34271
Output Resistance (Isource = 4.0 mA)
Output Short Circuit Current
0.0565
0.0580
0.0595
0.0500
0.0520
0.0535
0.1135
0.1160
0.1185
0.1010
0.1035
0.1065
0.1135
0.1160
0.1185
0.1010
0.1035
0.1065
0.0565
0.0580
0.0595
0.0500
0.0520
0.0535
Ro
20
40
60
Ω
Iss
5.0
10
20
mA
LOGIC INPUTS (EN1, EN2, MODE)
Input Low State
VIL
0
–
0.8
V
Input High State
VIH
2.0
–
6.0
V
Input Impedance
Rin
25
50
100
kΩ
SOFT START CONTROL (SS1,SS2)
Charge Current (Capacitor Voltage = 1.0 V to 4.0 V)
Ichg
0.5
1.0
2.5
µA
Discharge Current (Capacitor Voltage = 1.0 V)
Idschg
250
650
–
µA
TOTAL SUPPLY CURRENT
VDD Current
Standby Mode (EN1 = EN2 = 0)
VDD Current
Backlight “On” (EN1 = 1; EN2 = 0)
VDD Current
LCD “On” (No Inductor) (EN1 = 0; EN2 = 1)
VB Current (V0 = 35 V)
VDD = 6.0 V
VDD = 16 V
ICC
–
2.0
5.0
µA
–
3.0
15
ICC
–
0.7
3.0
mA
ICC
–
0.9
2.0
mA
IO
–
1.2
3.0
mA
NOTE: 1. Low duty pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
Figure 1. Switch Output Duty Cycle versus
Compensation Voltage
1.0
VDD = 6.0 V
TA = 25°C
0.8
0.6
0.4
0.2
0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
VComp, COMPENSATION VOLTAGE (V)
Figure 2. Error Amp Open Loop Gain and
Phase versus Frequency
100
80
Gain
60
0
VDD = 6.0 V
VComp = 2.5 V
RL = Open
30
TA = 25°C
60
Phase
40
90
20
120
0
150
– 20
10
180
100
1.0 k
10 k
100 k
1000 k
f, FREQUENCY (Hz)
4
MOTOROLA ANALOG IC DEVICE DATA