A5974DTR STMicroelectronics, A5974DTR Datasheet - Page 29

• 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

ST1CC40
The ST1CC40 is a fixed-frequency, step-down DC-DC converter designed to
operate as a constant-current source. The device operates with an input supply
range from 3.5 to 18 V and provides up to 3 A output current with accurate
regulation, which makes it suitable for driving high-power LEDs.
Synchronous rectification improves overall system performance. The current is
set by an external resistor with 100 mV typ. feedback voltage, thus minimizing the
power loss on the sensing resistor. A 900 kHz switching frequency combined with
low-impedance ceramic capacitors minimize possible output ripple. The device
is protected against thermal overheating, switching overcurrent and output short
circuit.
Key features
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Application example
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Switching frequency: 900 kHz
Output current capability: 3 A
Output voltage: adjustable from 0.8 V up to V
Max operating input voltage: up to 18 V
Feedback voltage: 100 mV
Integrated 70 mΩ low-side R
Integrated 90 mΩ high-side R
Standby supply current: 6 μA over temperature range
Inhibit input pin for enabling and PWM dimming of the LEDs
Fast transient response
SO8 and MLP4x4 packages
V IN = 3.5 V to 18 V
DS(on)
DS(on)
MOSFET
MOSFET
VINSW
VINA
INH
6
2
1
PGND
in
8
Conventional buck topology
ST1CC40
AGND
4
7
3
SW
FB
Key benefits
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Enhanced dimming performance
High efficiency, up to 95%
Minimized component count
Flexibility of the application covering
5 V and 12 V buses
Tiny SMD external components for
compact LED drivers
Minimized power losses on sensing
resistor
DFN - 8L 4 x 4 mm
V SENSE
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