米6体育平台手机版

SNVS085X July 2000 – December 2017 LM3478

PRODUCTION DATA.

封装选项

机械数据 (封装 | 引脚)

D|8
- MSOI002K
DGK|8
- MPDS028E

散热焊盘机械数据 (封装 | 引脚)

订购信息

6.5 Electrical Characteristics

Unless otherwise specified, V_IN = 12V, R_FA = 40kΩ, T_J = 25°C

PARAMETER		TEST CONDITIONS	MIN	TYP	MAX	UNIT
V_FB	Feedback Voltage	V_COMP = 1.4V, 2.97 ≤ V_IN ≤ 40V	1.2416	1.26	1.2843	V
V_FB	Feedback Voltage	V_COMP = 1.4V, 2.97 ≤ V_IN ≤ 40V, −40°C ≤ T_J ≤ 125°C	1.228		1.292	V
ΔV_LINE	Feedback Voltage Line Regulation	2.97 ≤ V_IN ≤ 40V		0.001		%/V
ΔV_LOAD	Output Voltage Load Regulation	I_EAO Source/Sink			±0.5	%/A
V_UVLO	Input Undervoltage Lock-out			2.85		V
V_UVLO	Input Undervoltage Lock-out	−40°C ≤ T_J ≤ 125°C			2.97	V
V_UV(HYS)	Input Undervoltage Lock-out Hysteresis			170		mV
V_UV(HYS)	Input Undervoltage Lock-out Hysteresis	−40°C ≤ T_J ≤ 125°C	130		210	mV
F_nom	Nominal Switching Frequency	R_FA = 40KΩ		400		kHz
F_nom	Nominal Switching Frequency	R_FA = 40KΩ, −40°C ≤ T_J ≤ 125°C	350		440	kHz
R_{DS1 (ON)}	Driver Switch On Resistance (top)	I_DR = 0.2A, V_IN= 5V		16		Ω
R_{DS2 (ON)}	Driver Switch On Resistance (bottom)	I_DR = 0.2A		4.5		Ω
V_{DR (max)}	Maximum Drive Voltage Swing⁽²⁾	V_IN < 7.2V		V_IN		V
V_{DR (max)}	Maximum Drive Voltage Swing⁽²⁾	V_IN ≥ 7.2V		7.2		V
D_max	Maximum Duty Cycle⁽³⁾			100%
T_min (on)	Minimum On Time			325		ns
T_min (on)	Minimum On Time	−40°C ≤ T_J ≤ 125°C	210		600	ns
I_SUPPLY	Supply Current (non-switching)	See ⁽⁵⁾		2.7		mA
I_SUPPLY	Supply Current (non-switching)	See ⁽⁵⁾, −40°C ≤ T_J ≤ 125°C			3.3	mA
I_Q	Quiescent Current in Shutdown Mode	V_FA/SD = 5V ⁽⁶⁾, V_IN = 5V		5		µA
I_Q	Quiescent Current in Shutdown Mode	V_FA/SD = 5V ⁽⁶⁾, V_IN = 5V, −40°C ≤ T_J ≤ 125°C			10	µA
V_SENSE	Current Sense Threshold Voltage	V_IN = 5V	135	156	180	mV
V_SENSE	Current Sense Threshold Voltage	V_IN = 5V, −40°C ≤ T_J ≤ 125°C	125		190	mV
V_SC	Short-Circuit Current Limit Sense Voltage	V_IN = 5V		343		mV
V_SC	Short-Circuit Current Limit Sense Voltage	V_IN = 5V, −40°C ≤ T_J ≤ 125°C	250		415	mV
V_SL	Internal Compensation Ramp Voltage	V_IN = 5V		92		mV
V_SL	Internal Compensation Ramp Voltage	V_IN = 5V, −40°C ≤ T_J ≤ 125°C	52		132	mV
V_SL ratio	V_SL/V_SENSE		0.30	0.49	0.70
V_OVP	Output Over-voltage Protection (with respect to feedback voltage) ⁽⁴⁾	V_COMP = 1.4V	32	50		mV
		V_COMP = 1.4V, −40°C ≤ T_J ≤ 125°C	25
		VSSOP Package			78
		VSSOP Package, −40°C ≤ T_J ≤ 125°C			85
		SOIC Package			78
		SOIC Package, −40°C ≤ T_J ≤ 125°C			100
V_OVP(HYS)	Output Over-Voltage Protection Hysteresis⁽⁴⁾	V_COMP = 1.4V		60		mV
V_OVP(HYS)	Output Over-Voltage Protection Hysteresis⁽⁴⁾	V_COMP = 1.4V, −40°C ≤ T_J ≤ 125°C	20		110	mV
Gm	Error Amplifier Transconductance	V_COMP = 1.4V, I_EAO = 100µA (Source/Sink)	600	800	1000	µS
Gm	Error Amplifier Transconductance	V_COMP = 1.4V, I_EAO = 100µA (Source/Sink), −40°C ≤ T_J ≤ 125°C	365		1265	µS
A_VOL	Error Amplifier Voltage Gain	V_COMP = 1.4V, I_EAO = 100µA (Source/Sink)		38		V/V
A_VOL	Error Amplifier Voltage Gain	V_COMP = 1.4V, I_EAO = 100µA (Source/Sink), −40°C ≤ T_J ≤ 125°C	26		44	V/V
I_EAO	Error Amplifier Output Current (Source/ Sink)	Source, V_COMP = 1.4V, V_FB = 0V	80	110	140	µA
		Source, V_COMP = 1.4V, V_FB = 0V, −40°C ≤ T_J ≤ 125°C	50		180	µA
		Sink, V_COMP = 1.4V, V_FB = 1.4V	−100	−140	−180	µA
		Sink, V_COMP = 1.4V, V_FB = 1.4V, −40°C ≤ T_J ≤ 125°C	−85		−185	µA
V_EAO	Error Amplifier Output Voltage Swing	Upper Limit, V_FB = 0V, COMP Pin = Floating		2.2		V
		Upper Limit, V_FB = 0V, COMP Pin = Floating, −40°C ≤ T_J ≤ 125°C	1.8		2.4	V
		Lower Limit, V_FB = 1.4V		0.56		V
		Lower Limit, V_FB = 1.4V, −40°C ≤ T_J ≤ 125°C	0.2		1.0	V
T_SS	Internal Soft-Start Delay	V_FB = 1.2V, V_COMP = Floating		4		ms
T_r	Drive Pin Rise Time	Cgs = 3000pf, V_DR = 0 to 3V		25		ns
T_f	Drive Pin Fall Time	Cgs = 3000pf, V_DR = 0 to 3V		25		ns
V_SD	Shutdown threshold ⁽¹⁾	Output = High		1.27		V
		Output = High, −40°C ≤ T_J ≤ 125°C			1.4	V
		Output = Low		0.65		V
		Output = Low, −40°C ≤ T_J ≤ 125°C			0.3	V
I_SD	Shutdown Pin Current	V_SD = 5V		−1		µA
I_SD	Shutdown Pin Current	V_SD = 0V		+1		µA
I_FB	Feedback Pin Current			15		nA
T_SD	Thermal Shutdown			165		°C
T_sh	Thermal Shutdown Hysteresis			10		°C

(1) The FA/SD pin should be pulled to V_IN through a resistor to turn the regulator off. The voltage on the FA/SD pin must be above the maximum limit for Output = High to keep the regulator off and must be below the limit for Output = Low to keep the regulator on.

(2) The voltage on the drive pin, V_DR is equal to the input voltage when input voltage is less than 7.2 V. V_DR is equal to 7.2 V when the input voltage is greater than or equal to 7.2 V.

(3) The limits for the maximum duty cycle can not be specified since the part does not permit less than 100% maximum duty cycle operation.

(4) The over-voltage protection is specified with respect to the feedback voltage. This is because the over-voltage protection tracks the feedback voltage. The overvoltage protection threshold is given by adding the feedback voltage, V_FB to the over-voltage protection specification.

(5) For this test, the FA/SD pin is pulled to ground using a 40-K resistor.

(6) For this test, the FA/SD pin is pulled to 5 V using a 40-K resistor.