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

High Efficiency Linear Regulator

UC1834
UC2834
UC3834

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 Fau lt Latch With
100mA Crowbar Drive Output

BLOCK DIAGRA M

DESCRIPTI ON

The UC1834 family of integrated circuits is optimized for the design of low
input-output differen tial linear regulators. A high gain amplifier and 200mA
sink or source drive outputs facilitate high output current designs which use
an external pass devi ce. 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 ove r-voltage fault conditions. After a user defined delay for
transient reje ction, 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 crowb ar 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.

6/94

ABSOLUTE MAXI MUM RATING S (Note 1)

PACKAGE PIN FUNCTION

FUNCTION PIN

N/C 1
VIN + 2

−2.0V REF 3
+1.5V REF 4
Threshold Adjus t 5
N/C 6
VIN− 7
Sense− 8
Sense+ 9
N.Inv. I nput 10
N/C 11
Inv. Input 12
Fault Alert 13
Fault Delay 14
Driver Sink 15
N/C 16
Driver Source 17
Compensa tion / Shutd own 18
O.V. Latch Output/Reset 19
Crowbar Gate 20

Input Supply Voltage, VIN + . . . . . . . . . . . . . . . . . . . . . . . . . 40V

Driver Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400mA

Driver Sourc e to Sink Voltag e . . . . . . . . . . . . . . . . . . . . . . . 40V

Crowbar Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −200m A

+1.5V Ref ere nce Out pu t Cur re nt . . . . . . . . . . . . . . . . . . −10mA

Fault Alert Vo ltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V

Fault Alert Cu rr ent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15mA

Error Amplifier Inputs . . . . . . . . . . . . . . . . . . . . . . −0. 5V to 35V

Current Sense Inp ut s . . . . . . . . . . . . . . . . . . . . . . −0.5V to 40V

O.V. Latch Out pu t Voltage . . . . . . . . . . . . . . . . . . −0.5V t o 40V

O.V. Latch Output Current . . . . . . . . . . . . . . . . . . . . . . . . 15mA

CONNECTION DIAGRAMS

DIL-16, SOIC- 16 (T O P VIEW)
J or N Package, DW Package

PLCC-20, LCC-20 (TOP VIEW)
Q, L Packages

UC1834
UC2834
UC3834

Power Dissipation at T
Power Dissipation at T

Operating Jun ctio n Tem per atur e. . . . . . . . . . −55°C to +150°C

Storage Temperature. . . . . . . . . . . . . . . . . . . −65°C to +150°C

Lead Temperat ur e (sold ering , 10 secon ds). . . . . . . . . . . 300°C

Note 1: Volta ges are re fe ren ce t o V

Currents are positiv e into , negat ive out of th e specifi ed
terminals.
Consult Packag in g sect ion of Dat abo ok f or therm a l
limitations and cons id era tion s of packa ge.

A = 25°C . . . . . . . . . . . . . . . . . . 1000mW

C = 25°C. . . . . . . . . . . . . . . . . . 2000mW

IN

−

, Pin 5.

2

UC1834
UC2834
UC3834

ELECTRICAL CHARACTERISTICS:

PARAMETER TEST CONDITIONS

Turn-on Charact er is tics

Standby Supply Curre nt 5.5 7 5.5 10 m A

+1.5 Volt Reference

Output Volt age T

Line Regulatio n V
Load Regulation I

-2.0 Volt Referen ce (No te 2)

Output Volt age ( Referenced

+

to V

IN

)

Line Regulatio n V
Output Impedance 2.3 2.3 kΩ

Error Amplifier Section

Input Offs et Vo lta ge V
Input Bias Cur rent V
Input Offs et Cu rr ent V
Small Signal Open Loop Gain Output @ Pin 14, Pin 12 = V

CMRR V
PSRR V

Driver Sectio n

Maximum Output Current 200 350 200 350 mA
Saturation Volta ge I
Output Leakage Cu rrent Pin 12 = 35V, Pin 13 = V
Shutdown Input Volta ge

at Pin 14
Shutdown In put Current

at Pin 14
Thermal Shutdown (Note 3) 165 165 °C

Fault Amplifier Sect i on

Under- and Over-Voltage
Fault Threshold

Common Mode Sen sitivit y V
Supply Sensitivity V
Fault Delay 30 45 60 30 45 60 ms/µF
Fault Alert Out put Current 2 5 2 5 mA
Fault Alert Satur ation Voltage I
O.V. Latc h Out put Curr ent 2 4 2 4 mA
O.V. Latch Satura tion Voltag e I
O.V. Latch Out put Reset

Voltage
Crowbar Gate Current −100 −175 −100 −175 mA
Crowbar Gate Leakage

Current

Note 2: When using both th e 1.5V and −2.0V references t he cur rent out of pin 3 should be bala nced by an equivalent cur ren t into

−

Pin 2. The

2.0V outp ut will change −2.3mV per µA of imbalance.

Note 3: Thermal shut down turns off the drive r . If Pin 15 (O.V. Lat ch Out put ) is tied to P in 14 (Compe nsat ion/ Shu td own) the

O.V. Latch will be reset.

J = 25°C 1.485 1.5 1.515 1.47 1.5 1.53 V

T

J(MIN

IN+ = 5 to 35V 1 10 1 15 mV

OUT = 0 to 2mA 1 10 1 15 mV

J

= 25°C −2.04 −2 −1.96 −2.06 −2 −1.94 V

T
T

J(MIN) ≤ TJ ≤ TJ(MAX) −2.06 −1.94 −2.08 −1.92

IN+ = 5 to 35V 1.5 15 1.5 20 mV

CM = 1.5V 1 6 1 10 mV
CM = 1.5V −1 −4 −1 −8 µA
CM = 1.5V 0.1 1 0.1 2 µA

Pin 13, 20Ω to VIN−

CM = 0.5 to 33V, V
IN+ = 5 to 35V, VCM = 1.5V 70 100 70 100 dB

OUT = 100mA 0.5 1.2 0.5 1.5 V

I

OUT ≤ 100µA, Pin 13 = VIN−, Pin 12 =

V

IN+

Pin 14 = V
IOUT ≤ 100µA, Pin 13 = VIN−

CM = 1.5V, @ E/A I n puts 120 150 180 110 150 190 mV

V

IN+ = 35V, VCM = 1.5 to 33V −0.4 −0.8 −0.4 −1.0 %/v
CM = 1.5V, VIN+ = 5 to 35V −0.5 −1.0 −0.5 −1.2 %/V

OUT = 1mA 0 .2 0.5 0.2 0.5 V

OUT = 1mA 1 .0 1.3 1.0 1.3 V

V

IN+ = 35V, Pin 16 = VIN− −0.5 −50 −0.5 −50 µA

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. V

≤ TJ ≤ TJ(MAX) 1.47 1.53 1.455 1.545

)

IN−, Pin 12 = VIN+

IN+ = 15V , V IN− = 0V, TA = TJ.

UC1834

UC3834 UNITS

UC2834

MIN TYP MAX MIN TYP MAX

IN+

+

= 35V 60 80 60 80 dB

IN

IN−, Pin 14 = VIN− 0.1 50 0.1 50 µA

50 65 50 65 dB

0.4 1 0.4 1 V

−100 −150 −100 −150 µA

0.3 0.4 0.6 0.3 0.4 0.6 V

3