A5975ADTR STMicroelectronics, A5975ADTR Datasheet - Page 15

• Manufacturer Part Number: A5975ADTR
• Description: IC REG SW STEP-DOWN 2.5A 8SOIC
• Manufacturer: STMicroelectronics
• Series: -r
• Type: Step-Down (Buck), PWMr

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

A5975AD
Figure 7.
5.5
Current limitation circuitry
Error amplifier
The voltage error amplifier is the core of the loop regulation. It is a transconductance
operational amplifier whose non inverting input is connected to the internal voltage
reference (1.235 V), while the inverting input (FB) is connected to the external divider or
directly to the output voltage. The output (COMP) is connected to the external compensation
network. The uncompensated error amplifier has the following characteristics:
Table 5.
The error amplifier output is compared to the oscillator sawtooth to perform PWM control.
Transconductance
Low frequency gain
Minimum sink/source voltage
Output voltage swing
Input bias current
Description
Uncompensated error amplifier characteristics
Doc ID 018761 Rev 1
1500 µA/300 µA
0.4 V/3.65 V
2300 µS
Values
2.5 µA
65 dB
Functional description
15/50