Rev.5.2
Positive and Negative Voltage Three-channel Switching
Regulator for LCD Bias Supply
S-8335 Series
The S-8335 Series is a bias supply IC for a Multi Line Addressing (MLA)
driven LCD using a dual-line simultaneous selection mode. This IC
supports medium-sized LCD panels. Two step-up type and one inverter
type PFM control CMOS switching regulators supply the required positive or
negative power to the two MLA-driven LCD common drivers and segment
drivers. Because of its CMOS structure, the current consumption of the S-
8335 Series is extremely low, which makes it ideal for the LCD power
supply of portable equipment that requires low power consumption. Also,
an extremely low power consumption LCD module can be created by using
1
the S-8335 Series with the LCD common driver (HD66523R
∗
:
1
Manufactured by Hitachi, Ltd.) and segment driver (HD66522
∗
:
Manufactured by Hitachi, Ltd.).
∗
1:These drivers are able to support 1/240duty and 1/200duty.
Features
•
Supports four types of LCD panels (1/240 duty, 1/200 duty, 1/160 duty, and 1/120 duty).
•
Input voltage range: 2.4 to 5.0 V (The S-8335 can be driven by a single direct-coupled lithium battery.)
•
Output voltage range
Common driver positive power supply (VRH) output voltage range(typ.value)
8.91 to 16.59 V (S-8335A240FT)
8.22 to 15.30 V (S-8335A200FT)
7.48 to 13.93 V (S-8335A160FT)
6.66 to 12.41 V (S-8335A120FT)
(This supply can be varied by on-chip 6-bit electric volume. Power MOSFET is built in.)
Common driver negative power supply (VRL) output voltage range(typ.value)
-6.87 to -12.80 V (S-8335A240FT)
-6.18 to -11.49 V (S-8335A200FT)
-5.44 to -10.13 V (S-8335A160FT)
-4.61 to -8.59 V (S-8335A120FT)
Segment driver positive power supply (VCH) output voltage range 2.0 to 3.8 V
Segment driver intermediate potential (VM) output voltage range 1.0 to 1.9 V
Icon positive power supply (VICON) output voltage range 1.0 to 2.2 V (This supply can be set arbitrarily
by external resistors.)
•
Low current consumption
100
µA
typ. (mode 1, V
BAT
= 3 V)
10
µA
typ. (mode 2, V
BAT
= 3 V)
1
µA
max. (mode 3, V
BAT
= 3 V)
•
Triple operation mode function: Triple mode switching according to 2-bit input
Mode 1: Normal operation
Mode 2: Icon mode (reference voltage circuit- and regulator S-only operation)
Mode 3: Standby mode (power off)
•
Power-off function
Stops step-up or step-down operation and short circuits VRH and VRL to VSS by on-chip and external
Nch transistors.
•
Soft-start function: This function can be set according to an external capacitor (CSS).
•
Oscillation frequency: 100 kHz
±
20 kHz, Duty = 50%
Applications
•
Power supply for medium-sized LCD panel
Package Name
•
24-pin TSSOP package (PKG diagram code: FT024-A)
Seiko Instruments Inc.
1
Positive and Negative Voltage Three-channel Switching Regulator for LCD Bias Supply
S-8335 Series
Rev.5.2
Block Diagram
L3
D3
CL3
VRH
CL1
VSTR_B
CONT1
L1
D1
A
VOUT1
CONT3
24
21
12
16
1
6
2
3
4
RESET
Electric
volume
VBAT
5
DC/DC P
PFM control
circuit
VOUT3
VCLK
VDIN
DC/DC U
PFM control
circuit
R1
17
R2
MC1
DC/DC Q
Mode
control
circuit
PFM control
circuit
14
23
VQERR
VREFU
20
MC2
22
Reference
voltage
generation
circuit
CREFU
op-amp X
Oscillator
VDDX
VXO
19
18
VCH
REG S
REG T
13
VM
VYO
VREGSF VREGSO VREGTF VREGTO
11
10
9
8
7
EXT2
15
op-amp Y
D2
CSS
CRS1 VICON
RS1
RS2
RT1
CRT1
RT2
F
VRL
L2
CL2
: small current VSS,
:
large current VSS
Figure 1. Block Diagram
Note:
Except for op-amp X, all of the power for the internal circuits of the S-8335 Series is supplied by the VBAT
pins. The power supply for op-amp X uses V
OUT3
, which is generated by stepping up V
BAT
using DC/DC U.
Short-circuit the VOUT3 and VDDX pins as shown in the figure above.
2
Seiko Instruments Inc.
Positive and Negative Voltage Three-channel Switching Regulator for LCD Bias Supply
S-8335 Series
Rev.5.2
Selection Guide
1. Product name
S
−
8335A XXX FT
Package name (abbreviation)
Product type
240: 1/240 duty support
200: 1/200 duty support
160: 1/160 duty support
120: 1/120 duty support
2. Product list
S-8335AXXXFT Series
Bias Ratio
Common Driver Positive
Power Supply VRH
Output Voltage Range [V]
V
RH_min
S-8335A240FT
S-8335A200FT
S-8335A160FT
S-8335A120FT
8.75
8.04
7.33
6.50
8.91
8.22
7.48
6.66
V
RH_max
16.59
15.30
13.93
12.41
Common Driver Negative
Power Supply VRL
Output Voltage Range [V]
V
RL_min
−6.87
−6.18
−5.44
−4.61
V
RL_max
−12.80
−11.49
−10.13
−8.59
Note: V
RH_min
and V
RL_min
indicate the typical value of the VRH and VRL output voltage, respectively,
when the electric volume is set to the minimum, and V
RH_max
and V
RL_max
indicate the typical
value of the VRH and VRL output voltage, respectively, when the electric volume is set to the
maximum. Also, V
RH_max
is obtained from V
RETGO
×
7.136 and V
RH_min
is obtained from V
RETGO
×
3.832, where V
RETGO
is the regulator T output voltage.
Seiko Instruments Inc.
3
Positive and Negative Voltage Three-channel Switching Regulator for LCD Bias Supply
S-8335 Series
Rev.5.2
Pin Assignment
24-pin TSSOP Package
Top view
1
24
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
Pin Name
CONT1
VDIN
VCLK
VSTR_B
VSS
VOUT1
CSS
VREGTO
VREGTF
VREGSO
VREGSF
VBAT
VYO
VQERR
EXT2
VBAT
VSS
VXO
VDDX
VREFU
VOUT3
MC2
MC1
CONT3
Function
External inductor 1 connection pin
Electric volume data input pin
Electric volume clock input pin
Electric volume strobe signal input pin
GND pin
Switching regulator P output voltage pin
Soft start capacitor connection pin
Regulator T output pin
Regulator T feedback input pin
Regulator S output pin
Regulator S feedback input pin
Power supply pin
OP amplifier Y output pin
Switching regulator Q output voltage monitoring
pin
Switching regulator Q external transistor
connection pin
Power supply pin
GND pin
OP amplifier X output pin
OP amplifier X power supply pin
Switching regulator U internal reference voltage
pin
Switching regulator U output voltage pin
Operating mode control pin 2
Operating mode control pin 1
External inductor 3 connection pin
12
13
14
15
16
17
18
19
20
21
22
23
24
Absolute Maximum Ratings
(Unless otherwise specified: T
OPR
=25
°
C)
Parameter
VBAT pin voltage
CONT1 pin voltage
CONT1 pin current
VOUT1 pin voltage
EXT2 pin voltage
EXT2 pin current
CONT3 pin voltage
CONT3 pin current
VOUT3 pin voltage
VQERR pin voltage
VDDX pin voltage
VXO pin voltage
Other pin voltage
Power dissipation
Operating temperature range
Storage temperature range
P
D
T
OPR
T
STG
Symbol
V
BAT
V
CONT1
I
CONT1
V
OUT1
V
EXT2
I
EXT2
V
CONT3
I
CONT3
V
OUT3
V
QERR
V
DDX
V
XO
Ratings
8
−0.3
to +20
300
−0.3
to +20
−0.3
to V
BAT
+20
±50
−0.3
to +8
200
−0.3
to +8
−0.3
to +8
8
−0.3
to V
DDX
+0.3
−0.3
to V
BAT
+0.3
650
−20
to +70
−40
to +125
Unit
V
V
mA
V
V
mA
V
mA
V
V
V
V
V
mW
°C
°C
Note:
Although this IC incorporates an electrostatic protection circuit, the user is urged to avoid
subjecting the circuit to an extremely high static electricity or voltage in excess of its
performance.
Seiko Instruments Inc.
4
Positive and Negative Voltage Three-channel Switching Regulator for LCD Bias Supply
S-8335 Series
Rev.5.2
Electrical Characteristics
Note:
The data specifications are based on measured results using recommended peripheral parts (see page 9).
Common
(Unless otherwise specified: V
BA T
= 3.0 V, T
OPR
= 25
°
C)
Item
Symbol
Conditions
Min.
Typ.
Max.
Unit
Measure-
ment
Circuit
−
1
Input voltage
Mode 1 current
consumption for full
oscillation
V
BAT
I
MC11
Current flowing from power supply pin V
BAT
.
Only regulator S and T resistance externally.
Maximum setting for electric volume. Output
voltage of DC/DC P, U, and Q are each
setting value
×
0.9.
CONT1 and CONT3 are pulled up to 3 V via
a 300
Ω
resistor.
2.4
−
3.0
100
5.0
200
V
µA
Mode 1 current
consumption for
stopped oscillation
I
MC12
Current flowing from power supply pin V
BAT
.
Only regulator S and T resistance externally.
Maximum setting for electric volume. Output
voltage of DC/DC P, U, and Q are each
setting value
×
1.2.
CONT1 and CONT3 are pulled up to 3 V via
a 300
Ω
resistor.
−
40
90
µA
1
Mode 2 current
consumption
I
MC2
Current flowing from power supply pin V
BAT
.
Only regulator S and T resistance externally.
Output voltage of DC/DC P, U, and Q are 0
V.
CONT1 and CONT3 are pulled up to 3 V via
a 300
Ω
resistor.
−
10
20
µA
1
Mode 3 current
consumption
I
MC3
Current flowing from power supply pin V
BAT
.
Only regulator S and T resistance externally.
Output voltage of DC/DC P, U, and Q are 0
V.
CONT1 and CONT3 are pulled up to 3 V via
a 300
Ω
resistor.
−
−
1.0
µA
1
MC1, MC2, VDIN,
VCLK, VSTR_B
pin input voltage
V
CH
V
CL
1.6
−
−
−
−
0.4
V
V
1
1
Oscillator Part
(Unless otherwise specified: V
BAT
= 3.0 V, T
OPR
= 25
°
C)
Item
Symbol
Conditions
Min.
Typ.
Max.
Unit
Measure-
ment
Circuit
1
1
Oscillation frequency
Duty ratio
f
OSC
Duty
80
40
100
50
120
60
kHz
%
Seiko Instruments Inc.
5
51单片机
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