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Linear Technology Electronic Components Datasheet

LT8500 Datasheet

48-Channel LED PWM Generator

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LT8500
48-Channel LED PWM Generator
with 12-Bit Resolution and 50MHz
Cascadable Serial Interface
Features
n 3V to 5.5V Input Voltage
n 48 Independent PWM Outputs
n TTL/CMOS Logic 50MHz Serial Data Interface
n 12-Bit (4096 Steps) PWM Width Resolution
n 6-Bit (64 Steps) PWM Correction
(±50% of Programmed PWM Width)
n Up to 6.1kHz PWM Frequency (PWMCK = 25MHz)
n Phase-Shift Option Reduces Switching Noise
n Directly Controls Three LT3595A 16-Channel
LED Drivers
n Diagnostic Information: Sync Error/Open LED Flags
n 56-Pin (5mm × 9mm × 0.75mm) QFN Package
Applications
n Large Screen Display LED Backlighting
n Mono-, Multi-, Full-Color LED Displays
n LED Billboards and Signboards
n Motor Control
n Industrial Control
n Automated Test Equipment
n Robotics
Description
The LT®8500 is a pulse width modulation (PWM) genera-
tor with 48 independent channels. Each channel has an
individually adjustable 12-bit (4096-step) PWM register
and a 6-bit (64-step) ±50% correction register. All controls
are programmable via a simple serial data interface. Three
banks of 16-channels each can be configured such that
they operate 120° out-of-phase with each other.
The LT8500 features two diagnostic information flags:
synchronization error and open LED. The flags are sent,
with additional state information, on the serial data interface
during status read back. The 50MHz cascadable serial data
interface includes buffering and skew-balancing, making
the chip suitable for PWM intensive applications such
as large screen LCD dynamic backlighting and mono-,
multi- and full-color LED displays. The LT8500 is also
ideally suited to control three LT3595A LED drivers.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Typical Application
48 PWM OUTPUTS
5-WIRE
SERIAL
DATA
INTERFACE
OSC
DIAGNOSTIC
CIRCUIT
•••••
PWM[48:1]
SDI SDO
SCKI
SCK0
LDIBLANK
LT8500 (1)
PWMCK
OPENLED
48 PWM OUTPUTS
•••••
PWM[48:1]
SDI SDO
SCKI
SCK0
LDIBLANK
LT8500 (2)
PWMCK
OPENLED
••••
••••
••••
••••
••••
48 PWM OUTPUTS
•••••
PWM[48:1]
SDI SDO
SCKI
SCK0
LDIBLANK
LT8500 (N)
PWMCK
OPENLED
8500 TA01a
8500f
1
Datasheet pdf - http://www.DataSheet4U.net/


Linear Technology Electronic Components Datasheet

LT8500 Datasheet

48-Channel LED PWM Generator

No Preview Available !

www.DataSheet.co.kr
LT8500
Absolute Maximum Ratings
(Note 1)
VCC................................................................ –0.3V to 6V
SDI, SCKI, PWMCK, OPENLED,
LDIBLANK.......... –0.3V to Lesser of 6V and (VCC + 0.3V)
Operating Junction Temperature Range
(Note 2)................................................... –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
Pin Configuration
TOP VIEW
56 55 54 53 52 51 50 49 48 47
PWM1 1
46 PWM12
PWM24 2
45 PWM5
PWM23 3
44 PWM6
PWM22 4
43 PWM7
PWM21 5
42 PWM8
PWM28 6
41 LDIBLANK
PWM27 7
40 SDI
PWM26 8
39 PWMCK
PWM25 9
57 38 SCKO
PWM32 10 GND 37 VCC
PWM31 11
36 SCKI
PWM30 12
35 SDO
PWM29 13
34 OPENLED
PWM20 14
33 PWM33
PWM19 15
32 PWM34
PWM18 16
31 PWM35
PWM17 17
30 PWM36
PWM40 18
29 PWM45
19 20 21 22 23 24 25 26 27 28
UHH PACKAGE
56-LEAD (5mm × 9mm) PLASTIC QFN
TJMAX = 125°C, θJA = 35°C/W, θJC = 5°C/W
EXPOSED PAD (PIN 57) IS GND, MUST BE SOLDERED TO PCB
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT8500EUHH#PBF
LT8500EUHH#TRPBF
8500
56-Lead (5mm × 9mm) Plastic QFN
–40°C to 125°C
LT8500IUHH#PBF
LT8500IUHH#TRPBF
8500
56-Lead (5mm × 9mm) Plastic QFN
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
2
8500f
Datasheet pdf - http://www.DataSheet4U.net/


Part Number LT8500
Description 48-Channel LED PWM Generator
Maker Linear Technology Corporation
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LT8500 Datasheet PDF






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