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Part: IMP525EMA
Category:
Optoelectronics
-> Drivers/Controllers
-> LEDs
-> LEDs Lamp Drivers
Description: 0.9-2.5V, Single Cell Battery Powered Electroluminescent Lamp Driver/inverter
Company: IMP, Inc.
Datasheet: Download IMP525EMA datasheet File size : 29 kB
Request For quote: Find where to buy IMP525EMA
Datasheet text preview:
IMP525 IMP525
POWER MANAGEMENT
Single Cell Battery Powered Electroluminescent Lamp Driver/Inverter
The IMP525 is an Electroluminescent (EL) lamp driver designed for systems that must operate below 1 volt. The input supply voltage range is 0.9V to 2.5V. Typical output lamp drive voltage is 112V. All four EL lampdriving functions are on-chip. These are the switch-mode power supply, its high-frequency oscillator, the high-voltage H-bridge lamp driver and its low-frequency oscillator. EL lamps of up to 6nF capacitance can be driven to high brightness. The circuit requires few external components; one inductor, one diode, one capacitor and two resistors. The resistors set the frequency for the two oscillators. A disable mode puts the chip into a low current-drain state. When disabled, quiescent current drops to 2µA maximum with a VDD of 1.5V. The chip can be disabled by connecting RSW, the oscillator frequency setting resistors, to ground. A disable pad, accessible only on the die, can also be used to disable the driver. An internal circuit shuts down the switching regulator when the lamp drive voltage exceeds 112V peak-to-peak. This conserves power and extends battery life. The IMP525 is available in MicroSO and SO-8 packages and in die form.
Key Features
x Wide operating voltage range - from 0.9V to 2.5V x Simple design requires few passive components x 112V peak-to-peak typical AC output voltage x Adjustable output frequency controls lamp color and power consumption x Adjustable converter frequency minimizes circuit power consumption x Disable mode extends battery life x Disable current under 2µA x Compact MicroSO package option
Applications
x x x x x x x Audio/TV remote control units Pagers/Cellular phones PDAs Clocks and radios Portable GPS receivers LCD modules Toys
Block Diagram
VDD 1
4
LX CS
RSW-OSC GND
2
Switch Oscillator
3
5
+
C Regulation Control
Q 7 VREF Bridge Output Driver Q 6 VB Q VA
IMP525
REL-OSC
8
Lamp Drive Oscillator
Q
525_01.eps
IMP, Inc.
San Jose, CA
408-432-9100/www.impweb.com
IMP525 IMP525
Pin Configuration
SO/MicroSO
VDD RSW-OSC CS LX 1 2 3 4 IMP525 8 7 6 5 REL-OSC VA VB GND
525_02.eps
Ordering Information
Part Number
IMP525EMA IMP525ESA IMP525/D
Input Voltage
0.9V to 2.5V 0.9V to 2.5V 0.9V to 2.5V
Regulated Output Voltage
YES YES YES
Temperature Range
40°C to +85°C 40°C to +85°C 25°C
Pins-Package
8-MicroSO 8-SO Dice
Absolute Maximum Ratings
Supply Voltage, VDD, VRSW-OSC and VREL-OSC . . 0.5V to +3.5V Storage Temperature Range . . . . . . . . . . . . . . . . 65°C to +150°C Power Dissipation (SO package) . . . . . . . . . . . . 400mW Power Dissipation (MicroSO package) . . . . . . . 300mW Note: All voltages are referenced to GND. These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for prolonged time periods may affect device reliability.
Electrical Characteristics
Unless otherwise noted, VDD = 1.5V, RSW = 1M, REL = 1.0M, and TA = 25°C.
Parameter
ON-resistance of MOS Switch Operating Voltage Output Voltage at CS Output Voltage at CS Output Voltage Peak-to-Peak Quiescent VDD Supply Current, Disabled (Disable pin available on die only) Quiescent VDD Supply Current, Disabled Input Current at VDD Pin Input Current: IDD Plus Inductor Current VA-B Output Drive Frequency Boost Converter Switching Frequency Switching Duty Cycle Disable Input LOW Voltage (Disable pin available on die only) Disable Input HIGH Voltage (Disable pin available on die only)
Symbol
RDS(ON) VCS VCS VA-VB IQDIS IQDIS IDD IIN fEL fSW DSW VDISL VDISH
Conditions
I = 50mA VDD = 1.5V, See Figure 1, Table 1 VDD = 0.9V, See Figure 1, Table 2 VDD = 1.5V, See Figure 1 Disable = HIGH RSW-OSC = GND VDD = 1.5V VDD = 0.9V to 1.5V VDD = 1.5V VDD = 1.5V, See Figure 1, Table 1 VDD = 1.5V, See Figure 1, Table 1 VDD = 1.5V, See Figure 1
Min
0.9 52 104
Typ
58 50 112 70 1.0
Max
15 2.5 65 124
Units
V V V VP-P nA µA mA mA Hz kHz % V V
2.0 1.5 32
23 500 26 87.5 GND VDD - 0.5V
0.2 VDD
2
IMP525
Typical Characteristics
EL Lamp Drive Frequency
2400 2000 150
Boost Converter Switching Frequency
VDD = 1.5V TA = 25°C
VDD = 1.5V TA = 25°C Frequency (kHz)
125 100 75 50 25 0
Frequency (Hz)
1600 1200 800 400 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
525_08.eps
0
0.5
1.0
1.5
2.0
2.5
3.0
525_10.eps
REL (M)
RSW (M)
EL Lamp Drive Period
8 7 6 100
Boost Converter Switching Period
VDD = 1.5V TA = 25°C
75
VDD = 1.5V TA = 25°C
Period (ms)
4 3 2 1 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
525_07.eps
Period (ms)
5
50
25
0 0 0.5 1.0 1.5 2.0 2.5 3.0
525_09.eps
REL (M)
RSW (M)
3
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