SP7120AEB Exar Corporation, SP7120AEB Datasheet

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SP7120AEB

Manufacturer Part Number
SP7120AEB
Description
Display Modules & Development Tools Common Cathode Linear LED Driver
Manufacturer
Exar Corporation
Datasheet
FEATURES
The SP712X driver’s family provides a simple solution for a matched current source for any
color common cathode LED configuration. The common cathode connection allows the user to
increase the LED power dissipation by having the cathodes heat-sinked to the ground plane of
the circuit board. The SP7120 may drive two LEDs or one LED at twice the current with two
channels connected in parallel. The SP7122 can drive three LEDs or one LED at three times
the current. The factory preset current values are 15mA (version A), 20mA (version B), or 25mA
(version C) per channel. In shutdown mode (EN pin is LOW), the supply current drops to 40nA
typical.
Jan 7 ‘08 RevE
LED Driver for common cathode parallel
connected LEDs
Ultra Low Dropout Voltage of 150mV
No EMI, no switching noise
Integrated current matching
PWM and Analog brightness control
Enable/Shutdown control
Shutdown current < 1μA
Lead Free, RoHS Compliant Package:
Small footprint SOT23-6
The SP712x drivers are available in a small footprint 6-pin SOT23-6 package.
2 or 3 Channel Low Dropout
High Side Linear LED Driver
SP7120/22 Low Dropout LED Driver
SP7120 Powering 2 LEDs
C1 1nF
page
1
APPLICATIONS
Mobile Phones
PDA, DSC, MP3 players
Handheld Computers
Keypads and display backlight
SP7120/22
APPLICATION SCHEMATIC
GENERAL DESCRIPTION
© 2007 Sipex Corporation

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SP7120AEB Summary of contents

Page 1

Channel Low Dropout High Side Linear LED Driver FEATURES • LED Driver for common cathode parallel connected LEDs • Ultra Low Dropout Voltage of 150mV • No EMI, no switching noise • Integrated current matching • PWM ...

Page 2

These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended period ...

Page 3

SP7120 SOT23 Pin Name SP7120 Vcc 1 GND LED3 LED2 5 LED1 6 Jan 7 ‘08 RevE SP7122 Pin Description Power input pin. Bypass Vcc to GND with 1nF ...

Page 4

Output Part Number Current per channel SP7120A 15mA SP7120B 20mA SP7120C 25mA SP7122A 15mA SP7122B 20mA SP7122C 25mA The SP712X drivers are regulated current sources with an enable input. The SP7120 and SP7122 have factory preset LED current at three ...

Page 5

Powering 1 high power LED I Powering 1 high power LED I Jan 7 ‘08 RevE channels 75mA with C version OUT up to 50mA with C version OUT ...

Page 6

To obtain the best performance from the SP712X, a printed circuit board with ground plane is required. High quality, low series resistance ceramic 1nF bypass capacitors should be used at the Vcc and GND pins. This capacitor must be located ...

Page 7

I is for 2 Channels 15mA per channel OUT The quiescent current is part of the total output current I is for 2 Channels 15mA per channel OUT I is for 2 Channels 15mA per channel OUT Jan 7 ‘08 ...

Page 8

I is for 2 Channels 15mA per channel OUT Jan 7 ‘08 RevE I is for 2 Channels 15mA per channel OUT TYPICAL PERFORMANCE SP7120A SP7120/22 Low Dropout LED Driver 8 page © 2007 Sipex Corporation ...

Page 9

PWM Minimum duty cycle 15μS 20kHz CH1: PWM Signal CH2 Anode of LED CH4: LED current 10mA/div Jan 7 ‘08 RevE PWM Low duty cycle 15μS 5kHz CH1: PWM Signal CH2: Anode of LED SP7120/22 Low Dropout LED Driver 9 ...

Page 10

PWM High Duty Cycle 20kHz CH1: PWM Signal CH2: Anode of LED CH4: LED current 10mA/div The quiescent current is part of the total output current I is for 3 Channels 15mA per channel OUT Jan 7 ‘08 RevE TYPICAL ...

Page 11

I is for 3 Channels 15mA per channel OUT I is for 3 Channels 15mA per channel OUT I is for 3 Channels 15mA per channel OUT Jan 7 ‘08 RevE TYPICAL PERFORMANCE SP7122A I is for 3 Channels 15mA ...

Page 12

The quiescent current is part of the total output current I is for 3 Channels 15mA per channel OUT 50% Duty Cycle 5Khz PWM CH1: PWM Signal CH2: Anode of LED CH4: LED current 10mA/div Minimum On time 15μS 20kHz ...

Page 13

PWM 50% Duty Cycle Single LED 5kHz CH1: PWM Signal CH2 Anode of LED CH4: LED current 20mA/div PWM Minimum on time 15μS Single LED 20kHz CH1: PWM Signal CH2 Anode of LED CH4: LED current 20mA/div Jan 7 ‘08 ...

Page 14

The quiescent current is part of the total output current I is for 3 channels 20mA per channel OUT I is for 3 channels 20mA per channel OUT I is for 3 channels 20mA per channel OUT Jan 7 ‘08 ...

Page 15

I is for 3 channels 20mA per channel OUT PWM Minimum on time 15μS 20kHz CH1: PWM Signal CH2: Anode of LED CH4: LED current 10mA/div PWM Low Duty Cycle 5kHz CH1: PWM Signal CH2 Anode of LED CH4: LED ...

Page 16

PWM Low Duty Cycle Single LED 5kHz CH1: PWM Signal CH2 Anode of LED CH4: LED current 50mA/div PWM 50% Duty Cycle Single LED 20kHz CH1: PWM Signal CH2 Anode of LED CH4: LED current 50mA/div Jan 7 ‘08 RevE ...

Page 17

Jan 7 ‘08 RevE SP7120/22 Low Dropout LED Driver 17 page PACKAGE: 6 PIN SOT23 © 2007 Sipex Corporation ...

Page 18

Temp Part Number Range -40°C to SP7120AEK-L/TR +85°C -40°C to SP7120BEK-L/TR +85°C -40°C to SP7120CEK-L/TR +85°C -40°C to SP7122AEK-L/TR +85°C -40°C to SP7122BEK-L/TR +85°C -40°C to SP7122CEK-L/TR +85°C Pack quantity is 2500 for SOT23-6 tape and reel. For further assistance: ...

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