Datasheet

UNISONIC TECHNOLOGIES CO., LTD
ULE4275
Preliminary
LINEAR INTEGRATED CIRCUIT
5-V LOW-DROPOUT VOLTAGE
REGULATOR

DESCRIPTION
The UTC ULE4275 is a monolithic integrated low-dropout
voltage regulator. The device regulates an input voltage up to
45V to VOUT = 5V (typical). The device can drive loads up to
450mA. It also provides overcurrent protection and
overtemperature protection for control of the state of the output
voltage. The device generates a reset signal for an output
voltage, VOUT,rt, of 4.65V (typical). By the use of an external delay
capacitor, one can program the reset delay time.
The input capacitor, CIN, compensates for line fluctuation.
Using a resistor of approximately 1Ω in series with CIN dampens
the oscillation of input inductance and input capacitance. The
output capacitor, COUT, stabilizes the regulation circuit. The
specification for stability is at COUT ≥ 22μF and ESR ≤ 5Ω, within
the operating temperature range. Stability for electrolytic capacitors specifically is at COUT ≥ 68µF within the
operating temperature range.
The control amplifier compares a reference voltage to a voltage that is proportional to the output voltage and
drives the base of the series transistor through a buffer. Saturation control as a function of the load current prevents
any oversaturation of the power element. The device also incorporates a number of internal circuits for protection
against: overload, overtemperature, and reverse polarity.

FEATURES
* Qualified for Automotive Applications
* Output Voltage 5V ± 2%
* Very Low Current Consumption
* Power-On and Undervoltage Reset

* Reset Low-Level Output Voltage<1V
* Very Low Dropout Voltage
* Internal Short-Circuit Current Limiting
* Reverse-Polarity Proof
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
ULE4275L-TQ5-T
ULE4275G-TQ5-T
ULE4275L-TQ5-R
ULE4275G-TQ5-R
Package
Packing
TO-263-5
TO-263-5
Tube
Tape Reel
ULE4275L-TQ5-T
(1)Packing Type
(1) T: Tube, R: Tape Reel
(2)Package Type
(2) TQ5: TO-263-5
(3)Green Package
(3) L: Lead Free, G: Halogen Free and Lead Free
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Copyright © 2015 Unisonic Technologies Co., Ltd
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ULE4275
Preliminary

MARKING

PIN CONFIGURATION

PIN DESCRIPTION
PIN NO.
1
2
3
4
5

PIN NAME
IN
RESET
GND
DELAY
OUT
LINEAR INTEGRATED CIRCUIT
DESCRIPTION
Input. Connect to ground as close to device as possible, through a ceramic capacitor.
Reset output. Open-collector output
Ground. Internally connected to heatsink
Reset delay. Connect to ground with a capacitor to set delay time.
Output. Connect to ground with≥22µF capacitor, ESR<5Ω at 10kHz.
BLOCK DIAGRAM
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ULE4275

Preliminary
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATING (over operating free-air temperature range (unless otherwise noted))
RATINGS
UNIT
-42~45
V
VI
-0.3~7
V
Output Voltage
-1~16
V
VO
Range
-0.3~25
V
Input Current
II
±2
mA
Output Current
IO
±5
mA
Operating Junction Temperature
TJ
-40~150
°C
Storage Temperature
TSTG
-65~150
°C
Electrostatic
Human body model (HBM)
6000
V
V(ESD)
Discharge
Machine model (MM)
400
V
Notes: 1. Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
2. All voltage values are with respect to the network ground terminal.
Input Voltage Range
(Note 1)

PARAMETER
IN
DELAY
OUT
RESET
DELAY
SYMBOL
RECOMMENDED OPERATING CONDITIONS
(over operating free-air temperature range (unless otherwise noted))
PARAMETER
SYMBOL
Input Voltage
VI
Junction Temperature
TJ

MIN
5.5
-40
TYP
MAX
42
150
UNIT
V
°C
THERMAL RESISTANCES CHARACTERISTICS
PARAMETER
Junction-to-Ambient Thermal Resistance
Junction-to-Case
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SYMBOL
θJA
θJC
RATINGS
32.8
38
UNIT
°C/W
°C/W
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
Preliminary
LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS
(over recommended operating free-air temperature range, VI=13.5V, TJ=-40°C~150°C (unless otherwise noted) (see
Test Circuit))
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
IO=5mA~400mA, VI=6V~28V
4.9
5
5.1
V
Output Voltage
VO
4.9
5
5.1
V
IO=5mA~200mA, VI=6V~40V
Output Current Limit
IO
350
700
950
mA
TJ=25°C
150
200
μA
IO=1mA
TJ≤85°C
150
220
μA
Current Consumption, Iq=II-IO
IQ
IO=250mA
7.5
18
mA
IO=400mA
12
22
mA
Dropout Voltage (Note)
VDO
IO=300mA, Vdo=VI-VO
250
500
mV
Load Regulation
IO=5mA~400mA
15
30
mV
Line Regulation
∆VI=8V~32V, IO=5mA
-15
5
15
mV
Power-Supply Ripple Rejection
PSRR
fr=100Hz, Vr=0.5Vpp
60
dB
∆VO
0.5
mV/K
Temperature Output-Voltage Drift
∆T
RESET Switching Threshold
VO,rt
4.5
4.65
4.8
V
RESET Output Low Voltage
VROL
Rext≥5kΩ, VO>1V
0.2
0.4
V
RESET Output Leakage Current
IROH
VROH=5V
0
10
μA
RESET Charging Current
ID,c
VD=1V
3
5.5
9
μA
RESET Upper Timing Threshold
VDU
1.5
1.8
2.2
V
RESET Lower Timing Threshold
VDRL
0.2
0.4
0.7
V
Note: Measured when the output voltage VO has dropped 100 mV from the nominal value obtained at VI=13.5V.

SWITCHING CHARACTERISTICS
(over operating free-air temperature range (unless otherwise noted) (see Figure 1))
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
RESET Delay Time
trd
CD=47nF
10
RESET Reaction Time
trr
CD=47nF
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TYP
16
0.5
MAX
22
2
UNIT
ms
µs
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
Preliminary
LINEAR INTEGRATED CIRCUIT
TIMING DIAGRAM
VI
t
< trr
VO
VQ,rt
d△V = ID,c
CD
d△T
VD
t
VDU
VDRL
trr
trd
t
VRO
t
Power-On
Reset
Thermal
Shutdown
Voltage Dip
at Input
Undervoltage
Secondary
Spike
Overload
at Output
Figure 1. Reset Timing Diagram

TEST CIRCUIT
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ULE4275

Preliminary
LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION CIRCUIT
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
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