TIDT387 Test report

TIDT387 March 2024 LM25148-Q1 , LM74910-Q1 , TPS389006-Q1 , TPS62874-Q1 , TPS62875-Q1 , TPS62876-Q1 , TPS62877-Q1 , TPS746-Q1 , TPS7B69-Q1

3.3 Load Transients

Figure 3-78 to Figure 3-39 show load transient waveforms of the converters at the corresponding input voltages and at various load step conditions.

Figure 3-24 5V Pre-Regulator Buck Converter Load Transient Response, 13.5V Input, ≈ 6A-to-12A Load Step

Figure 3-26 VCCINT - Core Rail Buck Converter Load Transient Response, Load Step Rising Slew Rate, at 5V_IN, 12.8A-to-25.6A (that is, 33%-to-66%) Load Step (Slew Rate ≈ 40A/μs)

Figure 3-28 VCCO - PMIC_Buck1 Rail Converter Load Transient Response, at 5V_IN, 1.0V_OUT, 0A-to-3A (that is, 0%-to-100%) Load Step, PFM Mode

Figure 3-30 VCCAUX Rail Load Transient Response (PMIC_Buck2), at 5V_IN, 1.5V_OUT, 0A-to-1.1A (that is, 0%-to-100%) Load Step, PFM Mode

Figure 3-32 GTAVCC Rail Load Transient Response (PMIC_Buck3), at 5V_IN, 0.88V_OUT, 0A-to-0.49A (that is, 0%-to-70%) Load Step, PFM Mode

Figure 3-34 GTAVTT Rail Load Transient Response (PMIC_Buck4), at 5V_IN, 1.2V_OUT, 0A-to-0.91A (that is, 0%-to-70%) Load Step, PFM Mode

Figure 3-36 GTAVCCAUX Rail Load Transient Response (LDO), at 5V_IN, 1.5V_OUT, 0mA-to-35mA (that is, 0%-to-70%) Load Step, Full Step

Figure 3-38 GTAVCCAUX Rail Load Transient Response (LDO), at 5V_IN, 1.5V_OUT, 0A-to-0.035A (that is, 0%-to-70%) Load Step, Overshoot

Figure 3-25 VCCINT - Core Rail Buck Converter Load Transient Response, at 5V_IN, 12.8A-to-25.6A (that is, 33%-to-66%) Load Step

Figure 3-27 VCCINT - Core Rail Buck Converter Load Transient Response, Load Step Falling Slew Rate, at 5V_IN, 25.6A-to-12.8A (that is, 66%-to-33%) Load Step (Slew Rate ≈ 28A/μs)

Figure 3-29 VCCO Rail Load Transient Response (PMIC_Buck1), at 5V_IN, 1.0V_OUT, 0A-to-3A (that is, 0%-to-100%) Load Step, FPWM Mode

Figure 3-31 VCCAUX Rail Load Transient Response (PMIC_Buck2), at 5V_IN, 1.5V_OUT, 0A-to-1.1A (that is, 0%-to-100%) Load Step, FPWM Mode

Figure 3-33 GTAVCC Rail Load Transient Response (PMIC_Buck3), at 5V_IN, 0.88V_OUT, 0A-to-0.49A (that is, 0%-to-70%) Load Step, FPWM Mode

Figure 3-35 GTAVTT Rail Load Transient Response (PMIC_Buck4), at 5V_IN, 1.2V_OUT, 0A-to-0.91A (that is, 0%-to-70%) Load Step, FPWM Mode

Figure 3-37 GTAVCCAUX Rail Load Transient Response (LDO), at 5V_IN, 1.5V_OUT, 0A-to-0.035A (that is, 0%-to-70%) Load Step, Undershoot

Figure 3-39 GTAVCCAUX Rail Load Transient Response (LDO), at 5V_IN, 1.5V_OUT, 11mA-to-48mA Load Step, Full Step