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부품번호 MC34271 기능
기능 (MC34270 / MC34271) LIQUID CRYSTAL DISPLAY AND BACKLIGHT INTEGRATED CONTROLLER
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MC34271 데이터시트, 핀배열, 회로
Order this document by MC34270/D
Liquid Crystal Display and
Backlight Integrated Controller
MC34270
MC34271
The MC34270 and MC34271 are low power dual switching voltage
regulators, specifically designed for handheld and laptop applications, to
provide several regulated output voltages using a minimum of external parts.
Two uncommitted switching regulators feature a very low standby bias
current of 5.0 µA, and an operating current of 7.0 mA capable of supplying
output currents in excess of 200 mA.
Both devices have three additional features. The first is an ELD Output
that can be used to drive a backlight or a liquid crystal display. The ELD
output frequency is the clock divided by 256. The second feature allows
four additional output bias voltages, in specific proportions to VB, one of the
switching regulated output voltages. It allows use of mixed logic circuitry and
tprovides a voltage bias for N–Channel load control MOSFETs . The third
feature is an Enable input that allows a logic level signal to turn–“off” or
turn–“on” both switching regulators.
Due to the low bias current specifications, these devices are ideally suited
for battery powered computer, consumer, and industrial equipment where an
extension of useful battery life is desirable.
LIQUID CRYSTAL DISPLAY
AND BACKLIGHT
INTEGRATED CONTROLLER
SEMICONDUCTOR
TECHNICAL DATA
32
1
MC34270 and MC34271 Features:
Low Standby Bias Current of 5.0 µA
Uncommitted Switching Regulators Allow Both Positive and Negative
Supply Voltages
Logic Enable Allows Microprocessor Control of All Outputs
Synchronizable to External Clock
Mode Commandable for ELD and LCD Interface
Frequency Synchronizable
Auxiliary Output Bias Voltages Enable Load Control via N–Channel FETs
FB SUFFIX
PLASTIC PACKAGE
CASE 873
PIN CONNECTIONS
32 31 30 29 28 27 26 25
MOSFET is a trademark of Motorola, Inc.
1 DS1
DS2 24
2 Ref1
Ref2 23
MAXIMUM RATINGS (TA = 25°C, unless otherwise noted.)
Rating
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁInput Voltage
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁPower Dissipation and
Thermal Characteristics
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁMaximum Power Dissipation
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁCase 873
Symbol
VDD
Value
16
Unit
Vdc
PD 1.43 W
3 FB1
4 Comp1
5 SS1
6 S1
7 D1
FB2 22
Comp2 21
SS2 20
S2 19
D2 18
Thermal Resistance, Junction–to–Ambient
Thermal Resistance, Junction–to–Case
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁOutput #1 and #2 Switch Current
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁOutput #1 and #2 “Off”–State Voltage
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁFeedback Enable MOSFETs “Off”–State Voltage
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁOperating Junction Temperature
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁOperating Ambient Temperature
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁStorage Temperature Range
RθJA
RθJC
ISL & ISB
VSL
VLF
TJ
TA
Tstg
100
60
500
60
20
125
0 to +70
– 55 to +150
°C/W
°C/W
mA
Vdc
Vdc
°C
°C
°C
8 Drv1
VB 17
9 10 11 12 13 14 15 16
ORDERING INFORMATION
Device
Operating
Temperature Range Package
MC34270FB
MC34271FB
TA = 0° to +70°C
QFP–32
QFP–32
MOTOROLA ANALOG IC DEVICE DATA
© Motorola, Inc. 1996
Rev 1
1




MC34271 pdf, 반도체, 판매, 대치품
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
0.0500
0.0520
0.1135
0.1160
0.1010
0.1035
0.1135
0.1160
0.1010
0.1035
0.0565
0.0580
0.0500
0.0520
Ro 20 40
Iss 5.0 10
LOGIC INPUTS (EN1, EN2, MODE)
Input Low State
VIL 0 –
Input High State
VIH 2.0 –
Input Impedance
Rin 25 50
SOFT START CONTROL (SS1,SS2)
Charge Current (Capacitor Voltage = 1.0 V to 4.0 V)
Ichg 0.5 1.0
Discharge Current (Capacitor Voltage = 1.0 V)
Idschg
250 650
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
– 3.0
ICC – 0.7
ICC – 0.9
IO – 1.2
NOTE: 1. Low duty pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
0.0595
0.0535
0.1185
0.1065
0.1185
0.1065
0.0595
0.0535
60
20
0.8
6.0
100
2.5
5.0
15
3.0
2.0
3.0
mA
V
V
k
µA
µA
µA
mA
mA
mA
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
VDD = 6.0 V
VComp = 2.5 V
RL = Open
TA = 25°C
0
30
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

4페이지










MC34271 전자부품, 판매, 대치품
MC34270 MC34271
Figure 11. Representative Block Diagram Electroluminescent Backlight Configuration
EL
Panel
169 k
Brightness
VB
DAC
SW1
32
DS1
1
EN1
ÎÎ26 VDD
8 Drv1
÷2
31 Sync
30 RT
Vref
27 1.25 V
Ref1
2
3 FB1
4 Comp1
SS1
5
Ref2
23
22 FB2
Comp2
21 SS2
20
DS2
24
Circuit #1 Bias Supply
En
S
Q
R
D1
7
S1 6
÷ N ELD
9
VDD 11
OSC Mode
10
S
Q
R
En
ÎÎVDDÎÎ
VDD2
Circuit #2
Bias Supply
D2
18
S2 19
VB
17
V0
16
V1
15
25 EN2
VA
28
Gnd
29
BIAS
V2
14
VDD2
V3
13
VDD2
V4
12
“On/Off”
VDD
VB
6.0 V to 30 V
V0
V1
V2
V3
LCD
Display
V4
MOTOROLA ANALOG IC DEVICE DATA
7

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