Variable Divided Voltage Generator for LCDs
Overview
The LA5312V is a variable divided voltage generator IC for
multiple drive of LCD matrix.
Features
.
Power supply for variable bias LCD drive
(1/5 to 1/19 bias available by internal resistors)
.
Four voltage outputs generated by four operational
amplifiers.
.
Low current drain (0.18 mA typ.)
.
Miniflat package for miniaturization.
Package Dimensions
unit : mm
3179-SSOP20
[LA5312V]
SANYO : SSOP20
Specifications
Maximum Ratings
at Ta = 25C
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage
V
EE
max
V
CC
V
EE
36
V
Maximum output current
I
OUT
max
V1 V4
*Internal
mA
Allowable power dissipation
Pd max
330
mW
Operating temperature
Topr
20 to +75
C
Storage temperature
Tstg
30 to +125
C
Note 1: Continuous operation (without damage) is guaranteed in the above ranges.
Note 2: *The maximum output current is the value stipulated under the test conditions on page 4.
Note 3: Output pins V1 to V4-to-V
CC
or GND short not exceeding 1 ms is acceptable. (|V
CC
V
EE
| < 35 V)
Operating Conditions
at Ta = 25C
Parameter
Symbol
Conditions
Ratings
Unit
Supply voltage
V
EE
V
CC
V
EE
35.5 to 6
V
Input voltage
V
REF
V
REF
^
V
EE
: V
CC
V
REF
35 to 6
V
Output current
I
OUT
1,2
V1, V2
0.5 to +5
mA
I
OUT
3,4
V3, V4
10 to +5
mA
Note 4: Set V
CC
and V
EE
so that |V1| and |V
EE
V4| are 1 V or more.
Ordering number: EN5386
Monolithic Linear IC
LA5312V
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
53096HA(II) No.5386-1/5
Operating Characteristics
at Ta = 25C, V
CC
V
EE
= 20 V, V
REF
= V
EE
, R
X
= 8 R
Parameter
Symbol
Conditions
min
typ
max
Unit
Current drain
I
CC
, I
EE
STR = 5 V : V
CC
, V
EE
0.18
0.3
mA
Input current
I
STR
STR = 5 V : STR
9
12
A
Output voltage ratio
Ra1
V2 / V1
1.96
2.00
2.04
--
Ra2
(V
REF
V3) / (V
REF
V4)
1.96
2.00
2.04
--
Rb1
V
REF
/ V1
11.64
12.00
12.36
--
Rb2
V
REF
/ V2
5.82
6.00
6.18
--
Rb3
V
REF
/ (V
REF
V3)
5.82
6.00
6.18
--
Rb4
V
REF
/ (V
REF
V4)
11.64
12.00
12.36
--
Internal resistance ratio
R
X
1
Referenced to R across
R
X
4 and V
IN
3
: R
X
1 R
X
2
: R
X
1 R
X
3
: R
X
1 R
X
4
: R
X
1 V
IN
3
8
--
R
X
2
12
--
R
X
3
14
--
R
X
4
15
--
Resistance value
R
R value when voltage is applied across R
X
4 and
V
IN
3 is 0.5 V : R
X
4 V
IN
3
30
k
Load regulation
n
V1
+0.1 mA < I
OUT
1 < +5 mA : V1
20
mV
n
V2
+0.1 mA < I
OUT
2 < +5 mA : V2
20
mV
n
V3
+0.1 mA < I
OUT
3 < +5 mA : V3
20
mV
n
V4
+0.1 mA < I
OUT
4 < +5 mA : V4
20
mV
n
V1
0.5 mA < I
OUT
1 < 0.1 mA : V1
20
mV
n
V2
0.5 mA < I
OUT
2 < 0.1 mA : V2
20
mV
n
V3
10 mA < I
OUT
3 < 0.1 mA : V3
20
mV
n
V4
10 mA < I
OUT
4 < 0.1 mA : V4
(Source I
OUT
is negative and sink I
OUT
is positive).
20
mV
Allowable
power
dissipation,
Pd
max
m
W
Ambient temperature, Ta C
LA5312V
No.5386-2/5
Pin Assignment
Block Diagram
Start-up
circuit
(The voltages V
RX
1, V
RX
2, V
RX
3, and V
RX
4 must obey the relationship V
RX
1
^ V
RX
2
^ V
RX
3
^ V
RX
4).
LA5312V
No.5386-3/5
Maximum Output Current Load Test Conditions
The output load resistor values (R1 to R8) are set so that when an ``on'' level signal is input to inputs 1 and 2, a current of 15 to
30 mA max. flows to the sink side and the source side (approximately 2 mA on the V1 source side).
STR Pin Usage
Input 1
Input 2
V
CC
V
EE
= 35 V
R
X
= 8 R
C1 to 4 = 10 F
C5 = 33 F
R: 1 W or more
TR1 to 4: 2SA984
E or F rank
TR5 to 9: 2SC2274
E or F rank
Input 1
Input 2
Start-up
circuit
The STR input is configured as shown left.
.
The STR is either shorted with V
CC
or connected
to V
CC
via an external resistor.
.
It is possible to use a separate power supply
(V
IN
) such that 2 V < V
IN
< V
CC
for current
saving.
(2 V or more required for STR)
(2 V < V
IN
< V
CC
)
LA5312V
No.5386-4/5
No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment,
nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or
indirectly cause injury, death or property loss.
Anyone purchasing any products described or contained herein for an above-mentioned use shall:
1
Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors
and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and
expenses associated with such use:
2
Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO
ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally.
Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume
production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use
or any infringements of intellectual property rights or other rights of third parties.
This catalog provides information as of May, 1996. Specifications and information herein are subject to change without notice.
I
CC
V
CC
, I
STR
V
CC
Current
drain,
I
CC
m
A
Supply voltage, V
CC
V
Input
current,
I
STR
A
V
OUT
I
OUT
(source side)
Output
voltage,
V
OUT
V
Output current, I
OUT
mA
V
OUT
I
OUT
(sink side)
Output
voltage,
V
OUT
V
Output current, I
OUT
mA
LA5312V
No.5386-5/5
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