A5975ADTR STMicroelectronics, A5975ADTR Datasheet - Page 11
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A5975ADTR
Manufacturer Part Number
A5975ADTR
Description
IC REG SW STEP-DOWN 2.5A 8SOIC
Manufacturer
STMicroelectronics
Series
-r
Type
Step-Down (Buck), PWMr
Datasheet
1.A5975ADTR.pdf
(50 pages)
Specifications of A5975ADTR
Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
1.235 V ~ 35 V
Current - Output
2.5A
Frequency - Switching
500kHz
Voltage - Input
4 V ~ 36 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (0.154", 3.90mm Width) Exposed Pad
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
497-11425-2
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
A5975ADTR
Manufacturer:
ST
Quantity:
20 000
A5975AD
5
Figure 3.
Functional description
The main internal blocks are shown in the device block diagram in
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Block diagram
A voltage regulator supplying the internal circuitry. From this regulator, a 3.3 V
reference voltage is externally available.
A voltage monitor circuit which checks the input and the internal voltages.
A fully integrated sawtooth oscillator with a frequency of 500 kHz ± 15%, including also
the voltage feed-forward function and an input/output synchronization pin.
Two embedded current limitation circuits which control the current that flows through
the power switch. The pulse-by-pulse current limit forces the power switch off cycle-by-
cycle if the current reaches an internal threshold, while the frequency shifter reduces
the switching frequency in order to significantly reduce the duty cycle.
A transconductance error amplifier.
A pulse width modulator (PWM) comparator and the relative logic circuitry necessary to
drive the internal power.
A high side driver for the internal P-MOS switch.
An inhibit block for standby operation.
A circuit to implement the thermal protection function.
Doc ID 018761 Rev 1
Figure
Functional description
3. They are:
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