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SLUSFH4A March 2025 – July 2025 BQ25858-Q1 , BQ25858B-Q1

PRODUCTION DATA

封裝選項

請參考 PDF 數據表獲取器件具體的封裝圖。

機械數據 (封裝 | 引腳)

RRV|36

散熱焊盤機械數據 (封裝 | 引腳)

RRV|36
- QFND781A

訂購信息

8.2.1.2.7 Converter Fast Transient Response

The device integrates all the loop compensation, thereby providing a high density solution with ease of use. For faster transient reponse, the EN_CONV_FAST_TRANSIENT bit can be set to 1. If device is not used in boost mode operation, this section can be disregarded.

When the converter is operating in boost mode, the non-continuous inductor current flow to the load results in a right-half plane (RHP) zero. The RHP zero location is:

Equation 15.

R H P z = \frac{V_{I N, b o o s t}}{I_{I N, b o o s t}} \frac{1}{2 π L}

For good phase margin, the unity gain bandwidth (UGBW) of the converter should be about 1/3 of the RHPz. The boost output capacitor (C_load), and the converter transient parameters (R₁, gm₁) need to be scaled to move the location of the UGBW of the converter.

Equation 16.

1 \approx \frac{{A d i v \times g m}_{1} ({s R}_{1} C_{1} + 1)}{s C_{1}} [\frac{V_{i}}{I_{o} \times 50 m}] [\frac{1}{1 + s \frac{C_{l o a d} R_{l o a d}}{2}}]

The device adjusts Adiv, gm₁ and R₁ based on the output voltage and the EN_CONV_FAST_TRANSIENT bit setting per the table below. During some boost case scenarios, the C_load needs to be adjusted to limit the converter bandwidth.

BOOST OUTPUT VOLTAGE	Adiv	C₁	EN_CONV_FAST_TRANSIENT = 0		EN_CONV_FAST_TRANSIENT = 1
BOOST OUTPUT VOLTAGE	Adiv	C₁	gm₁	R₁	gm₁	R₁
≤8 V	1/5	75pF	0.4μ	600kΩ	2μ	1.3MΩ
8 V to 16 V	1/10	75pF	0.47μ	1MΩ	2μ	1.8MΩ
16 V to 32 V	1/20	75pF	0.67μ	2.8MΩ	2μ	2.8MΩ
>32 V	1/40	75pF	2μ	2.8MΩ	2μ	2.8MΩ

As an example, assume the device operates in boost mode from a 5V supply to provide a 7V boost output voltage with load up-to 5A and 10μH inductor. The RHPz is approximately located at:

Equation 17.

R H P z = \frac{V_{I N, b o o s t}}{I_{I N, b o o s t}} \frac{1}{2 π L} = 11.4 k H z

For best stability, the UGBW of the converter should be limited to 1/3 of the RHP zero, or 3.8kHz. If EN_CONV_FAST_TRANSIENT = 1, the equation becomes:

Equation 18.

1 \approx \frac{0.2 \times 2 μ (j ω \times 1.3 M Ω \times 75 p F + 1)}{j ω \times 75 p F} [\frac{5 V}{5 A \times 50 m}] [\frac{1}{1 + j ω \frac{C_{l o a d} \times 1.4}{2}}]

Solving the above for C_load gives ≥674μF capacitor requirement.

Conversely, if EN_CONV_FAST_TRANSIENT = 0, the UGBW equation becomes:

Equation 19.

1 \approx \frac{0.2 \times 0.4 μ (j ω \times 0.6 M Ω \times 75 p F + 1)}{j ω \times 75 p F} [\frac{5 V}{5 A \times 50 m}] [\frac{1}{1 + j ω \frac{C_{l o a d} \times 1.4}{2}}]

Solving the above for C_load gives ≥51μF capacitor requirement. However, the minimum recommended capacitor for converter stability is 80μF, so this minimum value should be used.