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7.1 Absolute Maximum Ratings ⁽¹⁾⁽²⁾

			MIN	MAX	UNIT
Maximum supply voltage, V_IN⁽³⁾		LM2597		45	V
Maximum supply voltage, V_IN⁽³⁾		LM2597HV		60	V
SD/SS pin input voltage⁽⁴⁾				6	V
Delay pin voltage⁽⁴⁾				1.5	V
Flag pin voltage			–0.3	45	V
Bias supply voltage, V_BS			–0.3	30	V
Feedback pin voltage			–0.3	25	V
Output voltage to ground (steady-state)			–1	1	V
Power dissipation			Internally limited
Lead temperature	D package	Vapor phase (60 sec)		215	°C
	D package	Infrared (15 sec)		220
	P package (soldering, 10 sec)			260
Maximum junction temperature				150	°C
Storage temperature, T_stg			–65	150	°C

(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and specifications.

(3) V_IN = 40V for the LM2597 and 60V for the LM2597HV.

(4) Voltage internally clamped. If clamp voltage is exceeded, limit current to a maximum of 1 mA.

7.2 ESD Ratings

			VALUE	UNIT
V_(ESD)	Electrostatic discharge	Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001⁽¹⁾⁽²⁾	±2000	V

(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.

(2) The human body model is a 100 pF capacitor discharged through a 1.5k resistor into each pin.

7.3 Recommended Operating Conditions

		MIN	MAX	UNIT
Supply voltage	LM2597	4.5	40	V
Supply voltage	LM2597HV	4.5	60	V
Temperature		–40	125	°C

7.4 Thermal Information

THERMAL METRIC⁽¹⁾		LM2597, LM2597HV		UNIT
		D (SOIC)	P (PDIP)
		8 PINS	8 PINS
R_θJA	Junction-to-ambient thermal resistance⁽²⁾	95	150	°C/W

(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report, SPRA953.

(2) Junction-to-ambient thermal resistance with approximately 1 square inch of printed circuit board copper surrounding the leads. Additional copper area will lower thermal resistance further.

7.5 Electrical Characteristics – 3.3 V

Specifications are for T_J = 25°C, V_INmax = 40 V for the LM2597, and 60 V for the LM2597HV (unless otherwise noted).

PARAMETER		TEST CONDITIONS		MIN⁽¹⁾	TYP ⁽²⁾	MAX⁽¹⁾	UNIT
SYSTEM PARAMETERS⁽³⁾⁽⁴⁾ (See Figure 46 for test circuit)
V_OUT	Output voltage	4.75 V ≤ V_IN ≤ V_INmax, 0.1 A ≤ I_LOAD ≤ 0.5 A	T_J = 25°C	3.168	3.3	3.432	V
V_OUT	Output voltage	4.75 V ≤ V_IN ≤ V_INmax, 0.1 A ≤ I_LOAD ≤ 0.5 A	Over full operating temperature range	3.135		3.465	V
η	Efficiency	V_IN = 12 V, I_LOAD = 0.5 A			80%

(1) All room temperature limits are 100% production tested. All limits at temperature extremes are specified via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).

(2) Typical numbers are at 25°C and represent the most likely norm.

(3) External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. When the LM2597xx is used as shown in the Figure 46 test circuit, system performance is shown in the test conditions column.

(4) No diode, inductor or capacitor connected to output pin.

7.6 Electrical Characteristics – 5 V

Specifications are for T_J = 25°C, V_INmax = 40 V for the LM2597, and 60 V for the LM2597HV (unless otherwise noted).

PARAMETER		TEST CONDITIONS		MIN⁽¹⁾	TYP⁽²⁾	MAX⁽¹⁾	UNIT
SYSTEM PARAMETERS⁽³⁾⁽⁴⁾ (See Figure 46 for test circuit)
V_OUT	Output voltage	7 V ≤ V_IN ≤ V_INmax, 0.1 A ≤ I_LOAD ≤ 0.5 A	T_J = 25°C	4.8	5	5.2	V
V_OUT	Output voltage	7 V ≤ V_IN ≤ V_INmax, 0.1 A ≤ I_LOAD ≤ 0.5 A	Over full operating temperature range	4.75		5.25	V
η	Efficiency	V_IN = 12 V, I_LOAD = 0.5 A			82%

(1) All room temperature limits are 100% production tested. All limits at temperature extremes are specified via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).

(2) Typical numbers are at 25°C and represent the most likely norm.

(3) External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. When the LM2597xx is used as shown in the Figure 46 test circuit, system performance is shown in the test conditions column.

(4) No diode, inductor or capacitor connected to output pin.

7.7 Electrical Characteristics – 12 V

Specifications are for T_J = 25°C, V_INmax = 40 V for the LM2597, and 60 V for the LM2597HV (unless otherwise noted).

PARAMETER		TEST CONDITIONS		MIN⁽¹⁾	TYP⁽²⁾	MAX⁽¹⁾	UNIT
SYSTEM PARAMETERS⁽³⁾⁽⁴⁾ (See Figure 46 for test circuit)
V_OUT	Output voltage	15 V ≤ V_IN ≤ V_INmax, 0.1 A ≤ I_LOAD ≤ 0.5 A	T_J = 25°C	11.52	12	12.48	V
V_OUT	Output voltage	15 V ≤ V_IN ≤ V_INmax, 0.1 A ≤ I_LOAD ≤ 0.5 A	Over full operating temperature range	11.4		12.6	V
η	Efficiency	V_IN = 25 V, I_LOAD = 0.5 A			88%

(1) All room temperature limits are 100% production tested. All limits at temperature extremes are specified via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).

(2) Typical numbers are at 25°C and represent the most likely norm.

(3) External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. When the LM2597xx is used as shown in the Figure 46 test circuit, system performance is shown in the test conditions column.

(4) No diode, inductor or capacitor connected to output pin.

7.8 Electrical Characteristics – Adjustable

Specifications are for T_J = 25°C, V_INmax = 40 V for the LM2597, and 60 V for the LM2597HV (unless otherwise noted).

PARAMETER		TEST CONDITIONS		MIN⁽¹⁾	TYP⁽²⁾	MAX⁽¹⁾	UNIT
SYSTEM PARAMETERS⁽³⁾⁽⁴⁾ (See Figure 46 for test circuit)
V_FB	Feedback voltage	4.5 V ≤ V_IN ≤ V_INmax, 0.1 A ≤ I_LOAD ≤ 0.5 A			1.230		V
		V_OUT programmed for 3 V, circuit of Figure 46	T_J = 25°C	1.193		1.267
		V_OUT programmed for 3 V, circuit of Figure 46	Over full operating temperature range	1.18		1.280
η	Efficiency	V_IN = 12 V, V_OUT = 3 V, I_LOAD = 0.5 A			80%

(1) All room temperature limits are 100% production tested. All limits at temperature extremes are specified via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).

(2) Typical numbers are at 25°C and represent the most likely norm.

(3) External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. When the LM2597xx is used as shown in the Figure 46 test circuit, system performance is shown in the test conditions column.

(4) No diode, inductor or capacitor connected to output pin.

7.9 Electrical Characteristics – All Output Voltage Versions

Specifications are for T_J = 25°C, I_LOAD = 100 mA, V_IN = 12 V for the 3.3-V, 5-V, and Adjustable version, and V_IN = 24 V for the 12-V version (unless otherwise noted).

PARAMETER		TEST CONDITIONS		MIN⁽¹⁾	TYP⁽²⁾	MAX⁽¹⁾	UNIT
DEVICE PARAMETERS
I_b	Feedback bias current	Adjustable version only, V_FB = 1.235 V	T_J = 25°C		10	50	nA
I_b	Feedback bias current	Adjustable version only, V_FB = 1.235 V	Over full operating temperature range			100	nA
f_O	Oscillator frequency⁽³⁾	T_J = 25°C		127	150	173	kHz
f_O	Oscillator frequency⁽³⁾	Over full operating temperature range		110		173	kHz
V_SAT	Saturation voltage	I_OUT = 0.5 A⁽⁴⁾⁽⁵⁾	T_J = 25°C		0.9	1.1	V
V_SAT	Saturation voltage	I_OUT = 0.5 A⁽⁴⁾⁽⁵⁾	Over full operating temperature range			1.2	V
DC	Max duty cycle (ON)⁽⁵⁾				100%
DC	Min duty cycle (OFF)⁽⁶⁾				0%
I_CL	Current limit	Peak current⁽⁴⁾⁽⁵⁾	T_J = 25°C	0.65	0.8	1.3	A
I_CL	Current limit	Peak current⁽⁴⁾⁽⁵⁾	Over full operating temperature range	0.58		1.4	A
I_L	Output leakage current	Output = 0 V⁽⁴⁾⁽⁶⁾⁽⁷⁾				50	μA
I_L	Output leakage current	Output = −1 V			2	15	mA
I_Q	Operating quiescent current	SD/SS pin open, V_BS pin open⁽⁶⁾			5	10	mA
I_STBY	Standby quiescent current	LM2597, SD/SS pin = 0 V⁽⁶⁾	T_J = 25°C		85	200	μA
		LM2597, SD/SS pin = 0 V⁽⁶⁾	Over full operating temperature range			250	μA
		LM2597HV	T_J = 25°C		140	250	μA
		LM2597HV	Over full operating temperature range			300	μA
SHUTDOWN/SOFT-START CONTROL (see Figure 46 for test circuit)
V_SD	Shutdown threshold voltage				1.3		V
		Low, shutdown mode, over full operating temperature range				0.6
		High, soft-start mode		2
V_SS	Soft-start voltage	V_OUT = 20% of nominal output voltage			2		V
V_SS	Soft-start voltage	V_OUT = 100% of nominal output voltage			3		V
I_SD	Shutdown current	V_SHUTDOWN = 0.5 V			5	10	μA
I_SS	Soft-start current	V_Soft-start = 2.5 V			1.6	5	μA
FLAG/DELAY CONTROL (see Figure 46 for test circuit)
	Regulator dropout detector threshold voltage	Low (Flag ON)		92%	96%	98%
VF_SAT	Flag output saturation voltage	I_SINK = 3 mA			0.3		V
		V_DELAY = 0.5 V	T_J = 25°C			0.7	V
		V_DELAY = 0.5 V	Over full operating temperature range			1	V
IF_L	Flag output leakage current	V_FLAG = 40 V			0.3		μA
	Delay pin threshold voltage				1.25		V
		Low (flag ON)		1.21			V
		High (flag OFF) and V_OUT regulated				1.29	V
	Delay pin source current	V_DELAY = 0.5 V			3	6	μA
	Delay pin saturation	Low (Flag ON)	T_J = 25°C		55	350	mV
	Delay pin saturation	Low (Flag ON)	Over full operating temperature range			400	mV
BIAS SUPPLY
I_BS	Bias supply pin current	V_BS = 2 V⁽⁶⁾			120	400	μA
I_BS	Bias supply pin current	V_BS = 4.4 V⁽⁶⁾			4	10	mA
I_Q	Operating quiescent current	V_BS = 4.4 V , V_in pin current⁽⁶⁾			1	2	mA

(1) All room temperature limits are 100% production tested. All limits at temperature extremes are specified via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).

(2) Typical numbers are at 25°C and represent the most likely norm.

(3) The switching frequency is reduced when the second stage current limit is activated. The amount of reduction is determined by the severity of current overload.

(4) No diode, inductor or capacitor connected to output pin.

(5) Feedback pin removed from output and connected to 0 V to force the output transistor switch ON.

(6) Feedback pin removed from output and connected to 12 V for the 3.3-V, 5-V, and the adjustable version, and 15 V for the 12-V version, to force the output transistor switch OFF.

(7) V_IN = 40 V for the LM2597 and 60 V for the LM2597HV.