POWER SUPPLY ICs Voltage Regulators - SP-Elektroniikka

POWER SUPPLY ICs Switching Regulators (DC-DC Converters)
STEP-UP, FOR LCD BIAS SUPPLY,
3-CHANNEL SWITCHING REGULATOR
The S-8335 series is an IC for the bias power supply of a
Multi Line Addressing (MLA) drive LCD with a two-line simultaneous
selection system. It can be used for a mediumsized
LCD panel. The positive and negative power supplies
required for the LCD common driver of 2MLA drive systems
and each segment driver is supplied by two step-up types
and one inversion type PFM control CMOS switching regulators.
Since the current consumption is very small due to the
CMOS structure, this series is ideal for the LCD power supply
of portable devices requiring low power consumption.
Moreover, it is possible to form a very low power consumption
LCD module using an LCD common driver (HD66523R *1 :
product of Hitachi, Ltd.), a segment driver (HD66522 *1 : product
of Hitachi, Ltd.), and the S-8335 series.
*1. These drivers can support 1/240 and 1/200 duty.
APPLICATIONS
• Power supply of medium-sized LCD panel
SELECTION GUIDE
Product name
Bias ratio
Common driver positive
power supply VRH output
voltage range [V]
Common driver negative
power supply VRL output
voltage range [V]
VRH_min VRH_max VRL_min VRL_max
S-8335A240FT-TB-G 8.75 8.91 16.59 –6.87 –12.80
S-8335A200FT-TB-G 8.04 8.22 15.30 –6.18 –11.49
S-8335A160FT-TB-G 7.33 7.48 13.93 –5.44 –10.13
S-8335A120FT-TB-G 6.50 6.66 12.41 –4.61 –8.59
FEATURES
S-8335 series
• Can be used in four kinds of LCD panels.
1/240 duty, 1/200 duty, 1/160 duty, 1/120 duty
• Input voltage range:
2.4 to 5.0 V (driving directly with one lithium battery is possible)
• Output voltage range
• Common driver positive power supply (VRH) output voltage
range (typ. value)
8.91 to 16.59 V (S-8335A240FT-TB-G)
8.22 to 15.30 V (S-8335A200FT-TB-G)
7.48 to 13.93 V (S-8335A160FT-TB-G)
6.66 to 12.41 V (S-8335A120FT-TB-G)
(Variable using built-in 6-bit electronic volume, also includes
built-in power MOS FET)
• Common driver negative power supply (VRL) output voltage
range (typ. value)
–6.87 to –12.80 V (S-8335A240FT-TB-G)
–6.18 to –11.49 V (S-8335A200FT-TB-G)
–5.44 to –10.13 V (S-8335A160FT-TB-G)
–4.61 to –8.59 V (S-8335A120FT-TB-G)
• Segment driver positive power supply output voltage range 2.0
to 3.8 V
• Segment driver middle output voltage range 1.0 to 1.9 V
• Positive power supply (VICON) output voltage range for icons
1.0 to 2.2 V (a voltage can be set by external resistor)
• Low current consumption: 100 µA typ. (Mode 1, VBAT = 3 V)
10 µA typ. (Mode 2, VBAT = 3 V)
1 µA max. (Mode 3, VBAT = 3 V)
• Triple operation mode function: Mode 1: Normal operation
Mode 2: Icon mode
Mode 3: Standby mode
• Shutdown function: Stepping up operation is stopped, and the VRH
and VRL pins are shorted to VSS using an
on-chip or external Nch transistor.
• Soft start function: Can be set by external capacitor (CSS).
• Oscillation frequency: 100 kHz ± 20 kHz, duty = 50%
• Package: 24-pin TSSOP
EXAMPLE OF APPLICATION CIRCUIT
L3
D3
L1 D1 A
+
CL3
RA1
RA2
CL1
CVBAT1
VBAT
CONT1
MC3
E
VOUT1
VDIN
VCLK
VSTR_B
CONT3
VOUT3
VDDX
12
1
6 2 3 4
24 21 19
VBAT
CVBAT2
16
VBAT
CR1
VQERR 14
CR2
R1
R2
5
VSS
S-8335
VREFU
20
CREFU
17
VSS
MC1
CMC1
MC2
CMC2
23
22
MC1
MC2
VREGSF VREGSO VREGTF VREGTO
11 10 9 8 7
CL6
CL7 CSS
CRS1 VICON
RS1 RT1 CRT1
RS2
RT2
VXO
VYO
EXT2
15
D2
F
L2 CL2
18
13
CL4
CL5
G
RA3
VBAT
C
D
VCH
Segment
driver
VM
VCL
VM
VRL VRH
Common
driver
MC3
Remark : Small current VSS, : Large current VSS
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