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PDF MC34270 Data sheet ( Hoja de datos )
| Número de pieza | MC34270 | |
| Descripción | (MC34270 / MC34271) LIQUID CRYSTAL DISPLAY AND BACKLIGHT INTEGRATED CONTROLLER | |
| Fabricantes | Motorola Semiconductors | |
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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
1 page  
MC34270 MC34271
Figure 3. Reference Voltage Change versus
Reference Current
0
Vref
– 5.0
–10
VA
–15
– 20
– 25
– 30
0
VDD = 6.0 V
TA = 25°C
1.0 2.0 3.0 4.0
I, CURRENT DRAW (mA)
5.0
Figure 4. Quiescent Current versus Supply Voltage
2.5 2.2
2.0
EN1 and EN2 = 1
1.8
1.5 EN1 = 1 and EN2 = 0
1.4
1.0 1.0
Standby Current
0.5 EN1 and EN2 = 0
RT = 169 k
No Loading
0.6
TA = 25°C
0 0.2
2.0 4.0 6.0 8.0 10 12 14 16 18
VDD, SUPPLY VOLTAGE (V)
Figure 5. FET Drain Voltage versus Sink Current
0.16
0.12
Figure 6. ELD and DRV1 Switch Output Source
and Sink Saturation versus Current
0 2.0
VDD
–1.0
Sink Saturation
VDD = 6.0 V
TA = 25°C
1.5
0.08
0.04
0
0
– 2.0
VDD = 6.0 V
TA = 25°C
50 100 150
ID, DRAIN CURRENT (mA)
200
– 3.0
– 4.0
0
Source Saturation
15 30 45
ISource, SWITCH OUTPUT CURRENT (mA)
1.0
0.5
0
60
0.30
0.25
0.20
0.15
0.10
0.05
0
– 0.05
– 0.10
0
Figure 7. Vref and VA Variation
versus Temperature
VDD = 6.0 V
VA
Vref
10 20 30 40 50 60
TA, AMBIENT TEMPERATURE (°C)
70
8.0
6.0
4.0
2.0
0
– 2.0
– 4.0
– 6.0
– 8.0
0
Figure 8. Oscillator Frequency Variation
versus Temperature
VDD = 6.0 V
RT = 169 k
10 20 30 40 50 60 70
TA, AMBIENT TEMPERATURE (°C)
MOTOROLA ANALOG IC DEVICE DATA
5
5 Page 
24
25
MC34270 MC34271
OUTLINE DIMENSIONS
FB SUFFIX
PLASTIC PACKAGE
CASE 873–01
L
17
16
–A–
L
32
1
DETAIL A
9
8
–D–
A
0.20 (0.008) M C A–B S
0.05 (0.002) A–B
S
0.20 (0.008) M H A–B S
DS
DS
–B–
B
V
B
BP
DETAIL A
–A–,–B–,–D–
BASE METAL
F
CE
–C–
SEATING
PLANE
H
–H–
DATUM
PLANE
GM
U
T
R
KQ
X
DETAIL C
M DETAIL C
J
N
–H–
DATUM
PLANE
0.01
(0.004)
D
0.20 (0.008) M C A–B S D S
SECTION B–B
VIEW ROTATED 90° CLOCKWISE
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DATUM PLANE –H– IS LOCATED AT BOTTOM OF
LEAD AND IS COINCIDENT WITH THE LEAD WHERE
THE LEAD EXITS THE PLASTIC BODY AT THE
BOTTOM OF THE PARTING LINE.
4. DATUMS –A–, –B– AND –D– TO BE DETERMINED AT
DATUM PLANE –H–.
5. DIMENSIONS S AND V TO BE DETERMINED AT
SEATING PLANE –C–.
6. DIMENSIONS A AND B DO NOT INCLUDE MOLD
PROTRUSION. ALLOWABLE PROTRUSION IS 0.25
(0.010) PER SIDE. DIMENSIONS A AND B DO
INCLUDE MOLD MISMATCH AND ARE DETERMINED
AT DATUM PLANE –H–.
7. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR PROTRUSION
SHALL BE 0.08 (0.003) TOTAL IN EXCESS OF THE D
DIMENSION AT MAXIMUM MATERIAL CONDITION.
DAMBAR CANNOT BE LOCATED ON THE LOWER
RADIUS OR THE FOOT.
MILLIMETERS
INCHES
DIM MIN MAX MIN MAX
A 6.95 7.10 0.274 0.280
B 6.95 7.10 0.274 0.280
C 1.40 1.60 0.055 0.063
D 0.273 0.373 0.010 0.015
E 1.30 1.50 0.051 0.059
F 0.273
– 0.010
–
G
0.80 BSC
0.031 BSC
H – 0.20 – 0.008
J 0.119 0.197 0.005 0.008
K 0.33 0.57 0.013 0.022
L
5.6 REF
0.220 REF
M
6°
8° 6°
8°
N 0.119 0.135 0.005 0.005
P
0.40 BSC
0.016 BSC
Q 5° 10° 5° 10°
R 0.15 0.25 0.006 0.010
S 8.85 9.15 0.348 0.360
T 0.15 0.25 0.006 0.010
U 5° 11° 5° 11°
V 8.85 9.15 0.348 0.360
X
1.0 REF
0.039 REF
MOTOROLA ANALOG IC DEVICE DATA
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MC34270.PDF ] | |
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