ST STPS2L25 User Manual

STPS2L25

Low drop power Schottky rectifier

Main product characteristics

IF(AV)	2 A
VRRM	25 V
Tj (max)	150° C
VF(max)	0.375	V

Features and benefits

■Very low forward voltage drop for less power dissipation

■Optimized conduction/reverse losses trade-off which means the highest efficiency in the applications

■Avalanche capability specified

Description

Single Schottky rectifier suited to switched mode power supplies and high frequency DC to DC converters.

Packaged in SMB, SMB flat for thermal resistance characteristic improvement, this device is especially intended for use in parallel with MOSFETs in synchronous rectification.

A

K

SMB

STPS2L25U

A

K

SMB flat STPS2L25UF

Table 1.				Absolute ratings (limiting values)
	Symbol				Parameter			Value	Unit
	VRRM			Repetitive peak reverse voltage				25	V
	IF(AV)			Average forward current	SMB	TL = 125° C	δ = 0.5	2	A
					SMB flat	TL = 135° C	δ = 0.5
	IFSM			Surge non repetitive forward current		tp = 10 ms sinusoidal		75	A
	PARM			Repetitive peak avalanche power		tp = 1 µs Tj = 25° C		1500	W
	Tstg			Storage temperature range				-65 to + 150	°C
	T	j		Operating junction temperature(1)				150	°C
1.	dPtot		1
	dTj	< Rth(j – a) condition to avoid thermal runaway for a diode on its own heatsink
	---------------	-------------------------

February 2007

Rev 5

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www.st.com

Characteristics							STPS2L25
1	Characteristics
Table 2.	Thermal resistance
Symbol		Parameter				Value			Unit
Rth(j-l)	Junction to lead			SMB		25			°C/W
				SMB flat		15
Table 3.	Static electrical characteristics
Symbol	Parameter	Test Conditions			Min.	Typ.	Max.		Unit
IR(1)	Reverse leakage current	Tj = 25° C	VR = VRRM				90		µA
		Tj = 125° C				15	30		mA
		Tj = 25° C	IF = 2 A				0.45
VF(1)	Forward voltage drop	Tj = 125° C				0.325	0.375		V
		Tj = 25° C	IF = 4 A				0.53
		Tj = 125° C				0.43	0.51

1. Pulse test: tp = 380 µs, δ < 2%

To evaluate the maximum conduction losses, use the following equation:

P = 0.24 x IF(AV) + 0.068 IF2(RMS)

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STPS2L25	Characteristics
Figure 1. Average forward power dissipation Figure 2.	Average forward current versus
versus average forward current	ambient temperature (δ = 0.5) SMB

PF(AV)(W)														2.2	IF(AV)(A)
1.2																		Rth(j-a)=Rth(j-l)
1.1				δ = 0.1		δ = 0.2			δ = 0.5					2.0							SMB
		δ = 0.05
1.0														1.8
0.9														1.6
0.8												δ = 1		1.4			Rth(j-a)=100°C/W
0.7														1.2
0.6
														1.0
0.5
0.4														0.8
0.3												T		0.6		T
0.2														0.4
0.1						IF(AV)(A)				δ=tp/T		tp		0.2	δ=tp/T		tp	Tamb(°C)
0.0														0.0
0.0	0.2	0.4	0.6	0.8	1.0	1.2	1.4	1.6	1.8	2.0	2.2	2.4	2.6		0	25	50	75	100	125	150

Figure 3. Average forward current	Figure 4. Non repetitive surge peak forward
versus ambient temperature	current versus overload duration
(δ = 0.5) SMB flat	(maximum values) SMB

	IF(AV)(A)							10	IM(A)
2.2				Rth(j-a)=Rth(j-l)								SMB
2.0								9
1.8						SMB flat		8
1.6								7
			Rth(j-a)=100°C/W
1.4
								6
1.2								5				Ta=25°C
1.0
												Ta=75°C
								4
0.8
0.6								3				Ta=125°C
		T
								2
0.4									IM
0.2	δ=tp/T	tp		Tamb(°C)				1		t	t(s)
0.0								0		δ=0.5
	0	25	50	75	100	125	150	1.E-03		1.E-02	1.E-01	1.E+00

Figure 5. Non repetitive surge peak forward Figure 6.	Normalized avalanche power
current versus overload duration	derating versus pulse duration
(maximum values) SMB flat

	IM(A)				PARM(tp)
	30
					PARM(1µs)
				SMB flat
					1
	25
	20				0.1
				TL=25°C
	15
				TL=75°C
	10				0.01
				TL=125°C
	5	IM
		t	t(s)		0.001			tp(µs)
	0	δ=0.5
					0.01	0.1	1	10	100	1000
	1.E-03	1.E-02	1.E-01	1.E+00

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