Texas Instruments UC3834Q, UC3834QTR, UC3834N, UC3834J, UC3834DWTR Datasheet

UC1834

UC2834

UC3834

High Efficiency Linear Regulator

FEATURES

∙Minimum VIN - VOUT Less Than 0.5V At 5A Load With External Pass Device

∙Equally Usable For Either Positive or Negative Regulator Design

∙Adjustable Low Threshold Current Sense Amplifier

∙Under And Over-Voltage Fault Alert With Programmable Delay

∙Over-Voltage Fault Latch With 100mA Crowbar Drive Output

DESCRIPTION

The UC1834 family of integrated circuits is optimized for the design of low input-output differential linear regulators. A high gain amplifier and 200mA sink or source drive outputs facilitate high output current designs which use an external pass device. With both positive and negative precision references, either polarity of regulator can be implemented. A current sense amplifier with a low, adjustable, threshold can be used to sense and limit currents in either the positive or negative supply lines.

In addition, this series of parts has a fault monitoring circuit which senses both under and over-voltage fault conditions. After a user defined delay for transient rejection, this circuitry provides a fault alert output for either fault condition. In the over-voltage case, a 100mA crowbar output is activated. An over-voltage latch will maintain the crowbar output and can be used to shutdown the driver outputs. System control to the device can be accommodated at a single input which will act as both a supply reset and remote shutdown terminal. These die are protected against excessive power dissipation by an internal thermal shutdown function.

BLOCK DIAGRAM

6/94

UC1834

UC2834

UC3834

ABSOLUTE MAXIMUM RATINGS (Note 1)

Input Supply Voltage, VIN + . . . . . . . . . . . . . . . . . . . . . . . . . 40V Driver Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400mA Driver Source to Sink Voltage . . . . . . . . . . . . . . . . . . . . . . . 40V Crowbar Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −200mA +1.5V Reference Output Current . . . . . . . . . . . . . . . . . . −10mA Fault Alert Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V Fault Alert Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15mA Error Amplifier Inputs . . . . . . . . . . . . . . . . . . . . . . −0.5V to 35V Current Sense Inputs . . . . . . . . . . . . . . . . . . . . . . −0.5V to 40V O.V. Latch Output Voltage . . . . . . . . . . . . . . . . . . −0.5V to 40V O.V. Latch Output Current . . . . . . . . . . . . . . . . . . . . . . . . 15mA

Power Dissipation at TA = 25°C . . . . . . . . . . . . . . . . . . 1000mW Power Dissipation at TC = 25°C. . . . . . . . . . . . . . . . . . 2000mW Operating Junction Temperature . . . . . . . . . . −55°C to +150°C Storage Temperature. . . . . . . . . . . . . . . . . . . −65°C to +150°C Lead Temperature (soldering, 10 seconds). . . . . . . . . . . 300°C

Note 1: Voltages are reference to VIN−, Pin 5.

Currents are positive into, negative out of the specified terminals.

Consult Packaging section of Databook for thermal limitations and considerations of package.

CONNECTION DIAGRAMS

DIL-16, SOIC-16 (TOP VIEW)

J or N Package, DW Package

PLCC-20, LCC-20 (TOP VIEW)

Q, L Packages

PACKAGE PIN FUNCTION

FUNCTION	PIN
N/C	1
VIN +	2
−2.0V REF	3
+1.5V REF	4
Threshold Adjust	5
N/C	6
VIN−	7
Sense−	8
Sense+	9
N.Inv. Input	10
N/C	11
Inv. Input	12
Fault Alert	13
Fault Delay	14
Driver Sink	15
N/C	16
Driver Source	17
Compensation/ Shutdown	18
O.V. Latch Output/Reset	19
Crowbar Gate	20

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UC1834

UC2834

UC3834 ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for TA=−55°C to +125°C for the UC1834, −40°C to +85°C for the UC2834, and 0°C to +70°C for the

UC3834. VIN+ = 15V, VIN− = 0V, TA = TJ.

			UC1834					UC3834				UNITS
PARAMETER	TEST CONDITIONS		UC2834
		MIN		TYP		MAX	MIN		TYP		MAX
Turn-on Characteristics
Standby Supply Current				5.5		7			5.5		10	mA
+1.5 Volt Reference
Output Voltage	TJ = 25°C	1.485		1.5		1.515	1.47		1.5		1.53	V
	TJ(MIN) ≤ TJ ≤ TJ(MAX)	1.47				1.53	1.455				1.545
Line Regulation	VIN+ = 5 to 35V			1		10			1		15	mV
Load Regulation	IOUT = 0 to 2mA			1		10			1		15	mV
-2.0 Volt Reference (Note 2)
Output Voltage (Referenced	TJ = 25°C	−2.04		−2		−1.96	−2.06		−2		−1.94	V
to VIN+)	TJ(MIN) ≤ TJ ≤ TJ(MAX)	−2.06				−1.94	−2.08				−1.92
Line Regulation	VIN+ = 5 to 35V			1.5		15			1.5		20	mV
Output Impedance				2.3					2.3			kΩ
Error Amplifier Section
Input Offset Voltage	VCM = 1.5V			1		6			1		10	mV
Input Bias Current	VCM = 1.5V			−1		−4			−1		−8	μA
Input Offset Current	VCM = 1.5V			0.1		1			0.1		2	μA
Small Signal Open Loop Gain	Output @ Pin 14, Pin 12 = VIN+	50		65			50		65			dB
	Pin 13, 20Ω to VIN−
CMRR	VCM = 0.5 to 33V, VIN+ = 35V	60		80			60		80			dB
PSRR	VIN+ = 5 to 35V, VCM = 1.5V	70		100			70		100			dB
Driver Section
Maximum Output Current		200		350			200		350			mA
Saturation Voltage	IOUT = 100mA			0.5		1.2			0.5		1.5	V
Output Leakage Current	Pin 12 = 35V, Pin 13 = VIN−, Pin 14 = VIN−			0.1		50			0.1		50	μA
Shutdown Input Voltage	IOUT ≤ 100μA, Pin 13 = VIN−, Pin 12 =	0.4		1			0.4		1			V
at Pin 14	VIN+
Shutdown Input Current	Pin 14 = VIN−, Pin 12 = VIN+			−100		−150			−100		−150	μA
at Pin 14	IOUT ≤ 100μA, Pin 13 = VIN−
Thermal Shutdown (Note 3)				165					165			°C
Fault Amplifier Section
Underand Over-Voltage	VCM = 1.5V, @ E/A Inputs	120	150			180	110	150			190	mV
Fault Threshold
Common Mode Sensitivity	VIN+ = 35V, VCM = 1.5 to 33V			−0.4		−0.8			−0.4		−1.0	%/v
Supply Sensitivity	VCM = 1.5V, VIN+ = 5 to 35V			−0.5		−1.0			−0.5		−1.2	%/V
Fault Delay		30	45			60	30	45			60	ms/μF
Fault Alert Output Current		2	5				2	5				mA
Fault Alert Saturation Voltage	IOUT = 1mA		0.2			0.5		0.2			0.5	V
O.V. Latch Output Current		2	4				2	4				mA
O.V. Latch Saturation Voltage IOUT = 1mA			1.0			1.3		1.0			1.3	V
O.V. Latch Output Reset		0.3	0.4			0.6	0.3	0.4			0.6	V
Voltage
Crowbar Gate Current		−100		−175			−100		−175			mA
Crowbar Gate Leakage	VIN+ = 35V, Pin 16 = VIN−			−0.5		−50			−0.5		−50	μA
Current

Note 2: When using both the 1.5V and −2.0V references the current out of pin 3 should be balanced by an equivalent current into Pin 2. The −2.0V output will change −2.3mV per μA of imbalance.

Note 3: Thermal shutdown turns off the driver. If Pin 15 (O.V. Latch Output) is tied to Pin 14 (Compensation/Shutdown) the O.V. Latch will be reset.

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