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Part: IMP527EMA
Category:
Optoelectronics
-> Drivers/Controllers
-> LEDs
-> LEDs Lamp Drivers
Description: Input Voltage: 0.9-2.5V; Single Cell Battery Powered Electroluminescent Lamp Driver/inverter
Company: IMP, Inc.
Datasheet: Download IMP527EMA datasheet File size : 29 kB
Request For quote: Find where to buy IMP527EMA
Datasheet text preview:
I M P 5 27
POWER MANAGEMENT
Single Cell Battery Powered Electroluminescent Lamp Driver/Inverter
The IMP527 is an Electroluminescent (EL) lamp driver designed for systems that must operate down to 1 volt and below. The input supply voltage range is 0.9V to 2.5V. Typical output lamp drive voltage is 180V. All four EL lamp-driving functions are on-chip. These are the switchmode 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 1µA typical with a VDD of 1.5V. The chip can be disabled by connecting RSW, the oscillator frequency setting resistor, to ground. A disable pad (active low), 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 180V peak-to-peak. This conserves power and extends battery life. The IMP527 is available in MicroSO and SO-8 packages and in die form.
Key Features
N Wide operating voltage range - from 0.9V to 2.5V N Simple design requires few passive components N 180V peak-to-peak typical AC output voltage N Adjustable output frequency controls lamp color and power consumption N Adjustable converter frequency minimizes circuit power consumption N Disable mode extends battery life N Disable current 1µA typical N Compact MicroSO package option
Applications
N N N N N N N 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 V A
IMP527
REL-OSC
8
Lamp Drive Oscillator
Q
527_01.eps
© 2000 IMP, Inc.
408-432-9100/www.impweb.com
1
IMP527
Pin Configuration
SO/MicroSO
VDD RSW-OSC CS LX 1 2 3 4 IMP527 8 7 6 5 REL-OSC VA VB GND
527_02.eps
Ordering Information
Part Number
IMP527EMA IMP527ESA IMP527/D* IMP527/D1**
Input Voltage
0.9V to 2.5V 0.9V to 2.5V 0.9V to 2.5V 0.9V to 2.5V
Regulated Output Voltage
YES YES YES YES
Temperature Range
40°C to +85°C 40°C to +85°C 25°C 25°C
Pins-Package
8-MicroSO 8-SO Dice Dice
* Disable pad not active ** Disable pad active
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 = 1M, and TA = 25°C.
arameter
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, See Figure 1, Table 1 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 80
Typ
Max
15 2.5
Units
V V V VP-P nA µA mA mA Hz kHz % V V
90 50 180 70 1.0 2.0 1.5 32
26 500 26 87.5 GND VDD - 0.5V
0.2 VDD
2
P
408-432-9100/www.impweb.com
© 2000 IMP, Inc.
IMP527
Typical Characteristics
Boost Converter Switching Frequency
150
EL Lamp Drive Frequency
2400 2000
VDD = 1.5V TA = 25°C Frequency (kHz)
125 100 75 50 25 0
VDD = 1.5V TA = 25°C
Frequency (Hz)
1600 1200 800 400 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
527_08.eps
0
0.5
1.0
1.5
2.0
2.5
3.0
527_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
527_07.eps
Period (ms)
5
50
25
0 0 0.5 1.0 1.5 2.0 2.5 3.0
527_09.eps
REL (M)
RSW (M)
© 2000 IMP, Inc.
Electroluminescent Lamp Driver
3
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