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SNVSCU4 October 2025 LM25137

PRODMIX

封裝選項

機械數(shù)據(jù) (封裝 | 引腳)

RHA|36
- MPQF611A

散熱焊盤機械數(shù)據(jù) (封裝 | 引腳)

RHA|36
- QFND795

訂購信息

8.2.2.1 Design Requirements

Table 8-6 shows the intended input, output, and performance parameters for this automotive circuit example.

Table 8-4 Design Parameters

DESIGN PARAMETER	VALUE
Input voltage range (steady state)	8V to 18V
Minimum transient input voltage	6V
Maximum transient input voltage	36V
Output voltage	5V
Output current	20A
Switching frequency	2.1MHz
Output voltage regulation	±1%
No-load sleep current with phase 2 disabled	< 20μA
Shutdown current	4μA

Resistor R_RT of 10.5kΩ sets the switching frequency at 2.1MHz. In terms of control loop performance, the target loop crossover frequency is 80kHz with a phase margin greater than 50°. Leaving the RSS pin open sets the output voltage soft-start time to 6.5ms.

Table 8-7 cites the selected buck regulator powertrain components, with many of the components available from multiple vendors. Similar to circuit example 1, this design uses 40V logic-level MOSFETs, shielded buck inductors, shunt resistors with wide aspect ratio for low ESL, and an all-ceramic input and output capacitor implementation.

Table 8-5 List of Materials for Application Circuit 2

REFERENCE DESIGNATOR	QTY	SPECIFICATION⁽¹⁾	MANUFACTURER	PART NUMBER
C_IN1, C_IN2	4	10μF, 50V, X7R, 1210, ceramic	TDK	CNA6P1X7R1H106K
		10μF, 50V, X7S, 1210, ceramic	Murata	GCM32EC71H106KA03
		10μF, 50V, X7S, 1210, ceramic	TDK	CGA6P3X7S1H106M
C_OUT1, C_OUT2	8	47μF, 6.3V, X7R, 1210, ceramic	Murata	GCM32ER70J476KE19L
		47μF, 6.3V, X7R, 1210, ceramic	Taiyo Yuden	JMK325B7476KMHTR
		47μF, 6.3V, X7S, 1210, ceramic	TDK	CGA6P1X7S0J476M
L_O1, L_O2	2	0.47μH, 2.2mΩ, 26.5A, 6.71 × 6.51 × 3.1mm	Coilcraft	XGL6030-471MEC
		0.47μH, 3mΩ, 25A, 6.95 × 6.6 × 4.3mm	Cyntec	VCUW064ER47MS5
		0.47μH, 3.1mΩ, 20A, 7 × 6.9 × 3.8mm	Würth Electronik	744311047
		0.56μH, 3mΩ, 29A, 6.6 × 6.4 × 2.8mm	Bourns	SRP6030CA-R56M
Q₁, Q₃	2	40V, 4.7mΩ, 7nC, SON 5 × 6	Infineon	IAUC60N04S6L039ATMA
Q₂, Q₄	2	40V, 3.6mΩ, 9nC, SON 5 × 6	Infineon	IAUCN04S7L028ATMA
R_S1, R_S2	2	Shunt, 4mΩ ±1%, ±50ppm/°C, 0612, 1.5W	Susumu	KRL3216E-C-R004-F
U₁	1	LM25137 42V two-phase synchronous buck controller	Texas Instruments	LM25137RHAR

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