Document
HT2050 Five LAMP/LED Flash Driver
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Features
• • • • •
C-MOS Metal-Gate Process Operating voltage: 1.2V~4.5V Low stand-by current: 1µA at 3V A five lamp flash driver Random or sequence flash
• • • •
On/Off toggle control 1/10 duty cycle output A built-in oscillator Minimum external components
General Description
The HT2050 is a low cost, low-power CMOS fabricated LSI chip designed for lamp and LED flash drivers. It contains five flash outputs. Each flash output is with a 10mA capability that can implement random or sequential flashing controlled by a single option pin. The chip requires only one external resistor for normal applications. It is very suitable for use in products that require flashing lights, such as gift cards, Christmas decoration, etc.
Pin Assignment
Block Diagram
Pad Coordinates
Pad No.
1 2 3 4 5 6
Unit: mil
X
–21.09 –9.89 1.31 12.51 23.71 26.23
Y
–20.9 –20.9 –20.9 –20.9 –20.9 13.3
Pad No.
7 8 9 10 11 12
X
26.55 13.35 6.15 –10.89 –26.25 –26.25
Y
26.5 26.5 26.5 26.5 26.5 10.98
Chip size: 64 × 59 (mil)2 * The IC substrate should be connected to VDD in the PCB layout artwork.
1
26th Mar ’97
HT2050
Pad Description
Pad No.
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Pad Name
OUT1 OUT2 OUT3 OUT4 OUT5 OSC1 OSC2 VDD TEST OPTION ON/OFF VSS
I/O
O O O O O I O I
Description
Lamp/LED flash drive output Lamp/LED flash drive output Lamp/LED flash drive output Lamp/LED flash drive output Lamp/LED flash drive output Oscillator input Oscillator output Positive power supply
1 2 3 4 5 6 7 8 9
I/O For IC test only I I I Random or sequence function selection Toggle ON/OFF control Negative power supply, GND
10 11 12
Note: OPTION=VDD → Sequential Mode OPTION=Open → Random Mode
Absolute Maximum Ratings
Supply Voltage ................................. –0.3V to 5V Input/Output Voltage ... VSS–0.3V to VDD+0.3V Storage Temperature................. –50°C to 125°C Operating Temperature................... 0°C to 70°C
Electrical Characteristics
Symbol
VDD ISTB IDD IOL FOSC
Parameter VDD
Operating Voltage Stand-by Current Operating Current Output Sink Current Oscillator Frequency — 3V 3V 1.5V 3V —
Test Condition Condition
— — No load VOL=0.5V VOL=0.5V R=150K~300KΩ
Min.
1.2 — — 5 10 —
Typ.
3 1 200 8 15 64K
Max.
4.5 2 500 — — —
Unit
V
µA µA
mA mA Hz
2
26th Mar ’97
HT2050
Application Circuit
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3
26th Mar ’97
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