A5974DTR STMicroelectronics, A5974DTR Datasheet - Page 16

• Manufacturer Part Number: A5974DTR
• Description: IC BUCK ADJ 2.5A 8SOIC
• Manufacturer: STMicroelectronics
• Series: -r
• Type: Step-Down (Buck)r

Specifications of A5974DTR

• Internal Switch(s): -
• Synchronous Rectifier: -
• Number Of Outputs: -
• Voltage - Output: 1.235 V ~ 35 V
• Current - Output: 2.5A
• Frequency - Switching: 250kHz
• Voltage - Input: 4 V ~ 36 V
• Operating Temperature: -
• Mounting Type: *
• Package / Case: *
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-11424-2

LED7708
The LED7708 has been specifically designed to supply several LEDs starting from
a single low-voltage rail in order to address TV and monitor backlight, medium and
large size LCD panel backlight and RGB/RGGB backlight applications.
It integrates a boost controller, sixteen current generators and a 4-wire serial
interface.
The boost controller regulates the output voltage in an adaptive way according to
the LED’s need, resulting in improved overall efficiency. All the current generators
are 40 V rated, allowing the LED7708 to drive several LEDs in series on each
channel. The channels can be put in parallel for higher output current. The
brightness of the LEDs is controlled by using the serial interface. A selectable 12-bit
or 16-bit gray-scale brightness control allows independent PWM on each channel.
A programmable on-chip dimming oscillator is provided for external circuitry
simplification. The device has dedicated pins to lock synchronize with other
devices (master or slave) for noise reduction in multi-device applications.
The LED7708 implements basic protection (OVP, OCP and thermal shutdown), as
well as LED-array protection. It can detect and manage open-LED and shorted-
LED faults and different fault management options are available in order to cover
most application needs.
Key features
Boost controller section
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16
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Input voltage range (LDO):
3.6 to 36 V
Adaptive output voltage for high
efficiency
Internal +5 V LDO for gate driver
supply
Internal +3.3 V LDO for device
supply
High-performance external
MOSFET driver
Switching frequency:
250 kHz to 1 MHz
Programmable OV and OC
protection
Fixed-frequency peak current mode
control
External synchronization for
multi-device applications
Over-temperature alert and thermal
shutdown
LED array driver section
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16 channels with 85 mA/ch current
capability
Channel current accuracy: ±3%
±1.5% max channel-to-channel
current matching
LED short-circuit and open-channel
fault detection and management
4-wire, 30 MHz serial interface
Serial data formats: 16 x 16 bits,
1 x 256 bits or 1 x 192 bits
Grouped or independent channel
PWM control
Selectable 12/16-bit gray-scale
brightness control for local dimming
Programmable internal dimming
oscillator
Programmable gray-scale latency
Master/slave chain configuration
supported
Key benefits
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Flexible solution
High efficiency
Superior brightness control
Complete and smart fault
management
VFQFPN-48 7x7