LINER LT1033CK 3a negative adjustable regulator Datasheet

LT1033
NOT RECOMMENDED FOR NEW DESIGNS
3A Negative Adjustable
Regulator
Contact Linear Technology for Potential Replacement
U
FEATURES
■
■
■
DESCRIPTIO
Guaranteed 1% Initial Voltage Tolerance
Guaranteed 0.015%/V Line Regulation
Guaranteed 0.02%/ W Thermal Regulation
U
UU
PRECO DITIO I G
■
100% Thermal Limit Burn-in
The LT1033 is easy to use and difficult to damage. Internal
current and power limiting as well as true thermal limiting
prevents device damage due to overloads or shorts, even
if the regulator is not fastened to a heat sink.
U
APPLICATIO S
■
■
■
■
The LT®1033 negative adjustable regulator will deliver up
to 3A output current over an output voltage range of –1.2V
to –32V. Linear Technology has made significant
improvements in these regulators compared to previous
devices, such as better line and load regulation, and a
maximum output voltage error of 1%.
Adjustable Power Supplies
System Power Supplies
Precision Voltage/Current Regulators
On-Card Regulators
Maximum reliability is attained with Linear Technology’s
advanced processing techniques combined with a 100%
burn-in in the thermal limit mode. This assures that all
device protection circuits are working and eliminates field
failures experienced with other regulators that receive
only standard electrical testing.
, LTC and LT are registered trademarks of Linear Technology Corporation.
U
TYPICAL APPLICATIO
Negative 5V Regulator
Current Limit
6
2µF
TANT
R1
100Ω
ADJ
–VIN
IN
+
5
2µF
TANT
–5V, 3A
OUT
LT1033
LT1033 • TA01
OUTPUT CURRENT (A)
+
R2
301Ω
4
3
2
1
0
0
5
10
15
20
25
30
INPUT-OUTPUT DIFFERENTIAL (V)
35
LT1033 • G01
1033fc
1
LT1033
W W
W
AXI U
U
ABSOLUTE
RATI GS (Note 1)
Power Dissipation ....................................... Internally Limited
Input to Output Voltage Differential ................................. 35V
Operating Junction Temperature Range
LT1033M (OBSOLETE) ............................... –55°C to 150°C
LT1033C ......................................................... 0°C to 125°C
Storage Temperature Range
LT1033M (OBSOLETE) ............................... –65°C to 150°C
LT1033C ..................................................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec.) ........................ 300°C
U
U
W
PACKAGE/ORDER I FOR ATIO
BOTTOM VIEW
1
FRONT VIEW
FRONT VIEW
VOUT
2
ADJ VOUT
CASE IS
VIN
VOUT
VIN
VIN
ADJ
ADJ
CASE IS VIN
K PACKAGE
4-LEAD TO-3 METAL CAN
TJMAX = 150°C, θJA = 35°C/W(MK)
TJMAX = 125°C, θJA = 35°C/W(CK)
CASE IS VIN
P PACKAGE
3-LEAD PLASTIC TO-3P
TJMAX = 125°C, θJA = 35°C/W
T PACKAGE
3-LEAD PLASTIC TO-220
TJMAX = 125°C, θJA = 50°C/W
OBSOLETE PACKAGE
Consider the P or T Packages for Alternate Source
ORDER PART NUMBER
ORDER PART NUMBER
ORDER PART NUMBER
LT1033MK
LT1033CK
LT1033CT
LT1033CP
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS (Note 2)
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C.
SYMBOL PARAMETER
CONDITIONS
VREF
|VIN – VOUT| = 5V, IOUT = 5mA,
TJ = 25°C
Reference Voltage
3V ≤ |VIN – VOUT| ≤ 35V
5mA ≤ IOUT ≤␣ IMAX, P ≤ PMAX
∆VOUT
∆IOUT
∆VOUT
∆VIN
Load Regulation
Line Regulation
Ripple Rejection
Thermal Regulation
10mA ≤ IOUT ≤ IMAX, (Note 3)
TJ = 25°C,|VOUT| ≤ 5V
TJ = 25°C,|VOUT| ≥ 5V
|VOUT| ≤ 5V
|VOUT| ≥ 5V
MIN
LT1033M
TYP
MAX
MIN
LT1033C
TYP
MAX
–1.238
–1.250
–1.262
–1.238
–1.250
–1.262
V
–1.215
–1.250
–1.285
–1.200
–1.250
–1.300
V
●
●
10
0.2
20
0.4
50
1.0
75
1.5
10
0.2
20
0.4
50
1.0
75
1.5
mV
%
mV
%
●
0.005
0.01
0.015
0.04
0.01
0.02
0.02
0.05
%/V
%/V
●
3V ≤ |VIN – VOUT| ≤ 35V, (Note 2)
TJ = 25°C
VOUT = –10V, f = 120Hz
CADJ = 0
CADJ = 10µF
TJ = 25°C, 10ms Pulse
56
70
66
80
0.002
66
0.02
60
77
0.002
UNITS
dB
dB
0.02
%/W
1033fc
2
LT1033
ELECTRICAL CHARACTERISTICS (Note 2)
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C.
SYMBOL PARAMETER
LT1033M
TYP
MAX
●
65
●
●
0.2
1.0
CONDITIONS
MIN
IADJ
Adjust Pin Current
∆IADJ
Adjust Pin Current Change
10mA ≤␣ IOUT ≤ IMAX
3V ≤ |VIN – VOUT| ≤ 35V
Minimum Load Current
|VIN – VOUT| ≤ 35V
|VIN – VOUT| ≤ 10V
ISC
Current Limit
|VIN – VOUT| ≤ 10V, (Note 3)
|VIN – VOUT| = 35V, TJ = 25°C
∆VOUT
∆Temp
Temperature Stability of
Output Voltage
TMIN ≤ T ≤ TMAX
∆VOUT
∆Time
Long Term Stability
TA = 125°C, 1000 Hours
en
RMS Output Noise
(% of VOUT)
TA = 25°C, 10Hz ≤ f ≤ 10kHz
θJC
Thermal Resistance
Junction to Case
T Package
K Package
P Package
3
0.5
●
LT1033C
TYP
MAX
100
65
100
µA
2
5
0.5
2
2
5
µA
µA
2.5
1.2
5.0
3.0
2.5
1.2
5.0
3.0
mA
mA
4.3
1.3
6
2.5
4.3
1.3
6
2.5
A
A
0.6
1.5
0.6
1.5
%
0.3
1.0
0.3
1.0
%
MIN
3
0.5
0.003
1.2
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Unless otherwise indicated, these specifications apply:
|VIN – VOUT| = 5V; and IOUT = 5mA. Power dissipation is internally limited.
However, these specifications apply for power dissipation up to 30W.
UNITS
0.003
2.5
1.2
1.8
2.0
%
°C/W
°C/W
°C/W
4.0
2.0
2.7
See guaranteed minimum output current curve. IMAX = 3A.
Note 3: Testing is done using a pulsed low duty cycle technique. See
thermal regulation specifications for output changes due to heating effects.
Load regulation is measured on the output pin at a point 1/8" below the
base of the package.
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Dropout Voltage
Temperature Stability
1.8
1.6
2.6
2.4
2.2
TJ = 25°C
2.0
TJ = 150°C
1.8
1.6
TJ = –55°C
1.4
1.26
CURRENT (mA)
TJ = –55°C
REFERENCE VOLTAGE (V)
INPUT-OUTPUT DIFFERENTIAL (V)
Minimum Load Current
1.27
2.8
1.25
1.24
1.2
1.0
TJ = 25°C
0.8
0.6
TJ = 150°C
0.4
1.4
0.2
1.2
0.5
1.0
2.0
1.5
OUTPUT CURRENT (A)
2.5
3.0
LT1033 • G02
1.23
–75 –50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
LT1033 • G03
0
0
10
30
20
INPUT-OUTPUT DIFFERENTIAL (V)
40
LT1033 • G04
1033fc
3
LT1033
U W
TYPICAL PERFORMANCE CHARACTERISTICS
Ripple Rejection
Ripple Rejection
CADJ = 0
40
VIN – VOUT = 5V
20 IL = 500mA
f = 120Hz
TJ = 25°C
0
0
–10
–20
–30
OUTPUT VOLTAGE (V)
100
80
80
60
CADJ = 10µF
CADJ = 0
40
VIN = –15V
VOUT = –10V
IL = 500mA
TJ = 25°C
20
0
–40
10
100
1k
10k
FREQUENCY (Hz)
100k
LT1033 • G05
Output Impedance
10–3
10
100
1k
10k
FREQUENCY (Hz)
100k
1M
0.6
0.4
0.4
CADJ = 0
0.2
0
CADJ = 10µF
CADJ = 0
0.2
0
CADJ = 10µF
–0.2
–0.4
–0.6
VOUT = –10V
IL = 50mA
TJ = 25°C
CL = 1µF
0
–0.5
–1.0
0
10
20
TIME (µs)
LT1033 • G08
30
40
0
VIN = –15V
VOUT = –10V
INL = 50mA
TJ = 25°C
CL = 1µF
–0.5
–1.0
–1.5
0
10
20
TIME (µs)
LT1033 • G09
30
40
LT1033 • G10
Guaranteed Minimum
Output Current
Load Regulation*
Adjustment Current
80
5
ADJUSTMENT CURRENT (µA)
0.8
4
OUTPUT CURRENT (A)
OUTPUT VOLTAGE DEVIATION (%)
10
Load Transient Response
0.6
OUTPUT VOLTAGE
DEVIATION (V)
OUTPUT VOLTAGE
DEVIATION (V)
CADJ = 10µF
0.1
1
OUTPUT CURRENT (A)
LT1033 • G07
–0.4
10–2
VIN = –15V
VOUT = –10V
f = 120Hz
TJ = 25°C
0
0.01
1M
0.8
–0.2
INPUT VOLTAGE
CHANGE (V)
OUTPUT IMPEDANCE (Ω)
CADJ = 0
CADJ = 0
40
Line Transient Response
VIN = –15V
VOUT = –10V
IL = 500mA
CL = 1µF
TJ = 25°C
10–1
60
LT1033 • G06
101
100
CADJ = 10µF
20
LOAD CURRENT (A)
RIPPLE REJECTION (dB)
60
RIPPLE REJECTION (dB)
CADJ = 10µF
80
Ripple Rejection
100
RIPPLE REJECTION (dB)
100
0.4
0
–0.4
3
2
1
75
70
65
60
55
–0.8
0
0.8
1.6
2.4
3.2
OUTPUT CURRENT (A)
4.0
*THE LT1033 HAS LOAD REGULATION COMPENSATION
WHICH MAKES THE TYPICAL UNIT READ CLOSE TO ZERO.
THIS BAND REPRESENTS THE TYPICAL PRODUCTION SPREAD
0
0
5
10
15
20
25
30
INPUT-OUTPUT DIFFERENTIAL (V)
35
LT1033 • G12
50
–75 –50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
LT1033 • G13
LT1033 • G11
1033fc
4
LT1033
U
U
W
U
APPLICATIONS INFORMATION
Output Voltage
The output voltage is determined by two external resistors, R1 and R2 (see Figure 1). The exact formula for the
output voltage is:
 R2 
VOUT = VREF  1 +  + IADJ (R2)
 R1
Where: VREF = Reference Voltage, IADJ = Adjustment Pin
Current. In most applications, the second term is small
enough to be ignored, typically about 0.5% of VOUT. In
more critical applications, the exact formula should be
used, with IADJ equal to 65µA. Solving for R2 yields:
R2 =
VOUT – VREF
VREF
– IADJ
R1
Smaller values of R1 and R2 will reduce the influence of
IADJ on the output voltage, but the no-load current drain on
the regulator will be increased. Typical values for R1 are
between 100Ω and 300Ω, giving 12.5mA and 4.2mA
no-load current respectively. There is an additional consideration in selecting R1, the minimum load current
specification of the regulator. The operating current of the
LT1033 flows from input to output. If this current is not
absorbed by the load, the output of the regulator will rise
above the regulated value. The current drawn by R1 and R2
is normally high enough to absorb the current, but care
must be taken in no-load situations where R1 and R2 have
high values. The maximum value for the operating current,
+
+
C1
10µF
C2
5µF
R2
+
IADJ
VREF
C3
2µF
R1
ADJ
–VIN
VIN
VOUT
–VOUT
LT1033
LT1033 • F01
EXAMPLE:
1. A PRECISION 10V REGULATOR TO SUPPLY UP TO 3A LOAD CURRENT.
A. SELECT R1 = 100Ω TO MINIMIZE EFFECT OF IADJ
B. CALCULATE R2 =
VOUT – VREF 10V – 1.25V
=
= 704Ω
VREF
1.25V
– 65µA
– IADJ
100Ω
R1
which must be absorbed, is 5mA for the LT1033. If inputoutput voltage differential is less than 10V, the operating
current that must be absorbed drops to 3mA.
Capacitors and Protection Diodes
An output capacitor, C3, is required to provide proper
frequency compensation of the regulator feedback loop.
A 2µF or larger solid tantalum capacitor is generally
sufficient for this purpose if the 1MHz impedance of the
capacitor is 1Ω or less. High Q capacitors, such as Mylar,
are not recommended because their extremely low ESR
(effective series resistance) can drastically reduce phase
margin. When these types of capacitors must be used
because of other considerations, add a 0.5Ω carbon
resistor in series with 1µF. Aluminum electrolytic capacitors may be used, but the minimum value should be 25µF
to ensure a low impedance at 1MHz. The output capacitor
should be located within a few inches of the regulator to
keep lead impedance to a minimum. The following caution
should be noted: if the output voltage is greater than 6V
and an output capacitor greater than 20µF has been used,
it is possible to damage the regulator if the input voltage
becomes shorted, due to the output capacitor discharging
into the regulator. This can be prevented by using diode D1
(see Figure 2) between the input and the output.
The input capacitor, C2, is only required if the regulator is
more than 4 inches from the raw supply filter capacitor.
Bypassing the Adjustment Pin
The adjustment pin of the LT1033 may be bypassed with
a capacitor to ground, C1, to reduce output ripple, noise,
and impedance. These parameters scale directly with
output voltage if the adjustment pin is not bypassed. A
bypass capacitor reduces ripple, noise and impedance to
that of a 1.25V regulator. In a 15V regulator for example,
these parameters are improved by 15V/1.25V = 12 to 1.
This improvement holds only for those frequencies where
the impedance of the bypass capacitor is less than R1. Ten
microfarads is generally sufficient for 60Hz power line
applications where the ripple frequency is 120Hz, since
XC = 130Ω. The capacitor should have a voltage rating at
least as high as the output voltage of the regulator. Values
Figure 1
1033fc
5
LT1033
U
W
U
U
APPLICATIONS INFORMATION
larger than 10µF may be used, but if the output is larger
than 25V, a diode, D2, should be added between the output
and adjustment pins (see Figure 2).
+
C1
Proper Connection of Divider Resistors
R2
+
The LT1033 has a load regulation specification of 0.8%
and is measured at a point 1/8" from the bottom of the
package. To prevent degradation of load regulation, the
resistors which set output voltage, R1 and R2, must be
connected as shown in Figure 3. Note that the positive side
of the load has a true force and sense (Kelvin) connection,
but the negative side of the load does not.
C3
R1
D2**
1N4002
ADJ
–VIN
VIN
–VOUT
VOUT
LT1033
D1* 1N4002
LT1033 • F02
*D1 PROTECTS THE REGULATOR FROM INPUT SHORTS TO GROUND. IT IS
REQUIRED ONLY WHEN C3 IS LARGER THAN 20µF AND VOUT IS LARGER
THAN 6V
R1 should be connected directly to the output lead of the
regulator, as close as possible to the specified point 1/8"
from the case. R2 should be connected to the positive
side of the load separately from the positive (ground)
connection to the raw supply. With this arrangement, load
regulation is degraded only by the resistance between the
regulator output pin and the load. If R1 is connected to the
load, regulation will be degraded.
** D2 PROTECTS THE ADJUST PIN OF THE REGULATOR FROM OUTPUT
SHORTS IF C2 IS LARGER THAN 10µF AND VOUT IS LARGER THAN –25V
Figure 2
LEAD RESISTANCE HERE DOES
NOT AFFECT LOAD REGULATION
R2
LOAD
R1
ADJ
–VIN
VIN
VOUT
LT1033 • F03
LT1033
CONNECT R1
DIRECTLY TO
REGULATOR PIN
LEAD RESISTANCE HERE
DEGRADES LOAD
REGULATION. MINIMIZE
THE LENGTH OF THIS LEAD
Figure 3
1033fc
6
LT1033
U
TYPICAL APPLICATIO S
High Stability Regulator
The output stability, load regulation, line regulation,
thermal regulation, temperature drift, long term drift, and
noise can be improved by a factor of 6.6 over the standard
regulator configuration. This assumes a zener whose drift
and noise is considerably better than the regulator itself.
The LM329B has 20ppm/°C maximum drift and about 10
times lower noise than the regulator.
In the application shown below, regulators #2 to “N” will
track regulator #1 to within ±24mV initially, and to ±60mV
over all load, line, and temperature conditions. If any
regulator output is shorted to ground, all other outputs will
drop to ≈ –2V. Load regulation of regulators #2 to “N” will
be improved by VOUT/1.25V compared to a standard
regulator, so regulator #1 should be the one which has the
lowest load current.
7V
LM329B
R2*
+ 1µF
R1
1k
1%
R3
1.5k
1%
SOLID
TANTALUM
ADJ
–VIN
VIN
VOUT
–VOUT
LT1033
*R2 =
|VOUT|
9.08 • 10–3
– 908Ω
LT1033 • TA06
Dual Tracking 3A Supply ± 1.25V to ± 20V
LT150A
VOUT
VIN
+VIN
Multiple Tracking Regulators
+
C3
10µF
+
ADJ
R1**
100Ω
1%
R2
+
2µF
ADJ
–VIN
1N4002
+VOUT
R1
120Ω
+
C1
2µF
SOLID
TANTALUM
+
–VOUT1
VIN REG #1 VOUT
R2
5k
1%
10µF
+
ADJ
1N4002
VIN REG #2 VOUT
2µF
SOLID
TANTALUM
–VOUT2
LT1033
+
ADJ
VIN REG #N VOUT
LT1033
+
2.2µF*
D2
1N4002
ADJ
VIN
–VIN
VOUT
–VOUT
LT1033
LT1033 • TA07
*SOLID TANTALUM
**R1 OR R5 MAY BE TRIMMED SLIGHTLY TO IMPROVE TRACKING
+
2µF
D1
1N4002
R3
5k
R5**
100Ω
1%
2µF
2.2µF*
R4
5k
1%
10µF
LT1033
+
+
2µF
SOLID
TANTALUM
–VOUT3
Current Regulator
LT1033 • TA05
+
ADJ
(–)
VIN
C1
2µF
SOLID TANTALUM
(+)
VOUT
LT1033
RS
(O.5Ω ≤ RS ≤ 250Ω)
I
I = 65µA +
1.25V
RS
LT1033 • TA08
1033fc
7
LT1033
W
W
SCHE ATIC DIAGRA
ADJ
2k
2k
Q1
Q2
D4
20k
Q4
Q3
15pF
VOUT
D1
750Ω
Q6
D2
60k
Q7
800Ω
D3
Q32
Q34
100k
5k
15pF
2k
25pF
600Ω
Q33
18k
Q8
D5
100k
220Ω
Q11
Q10
Q12
Q9
20Ω
20Ω
Q25
6.8k
Q26
12k
250Ω
Q23
Q13
5pF
15k
4k
2pF
460Ω
12k
Q22
Q24
Q21
12k
1k
Q20
Q18
Q27
Q14
150Ω
Q31
Q30
Q19
270Ω
Q16
Q15
600Ω
Q28
Q17
4.2k
8k
4k
20k
10Ω
100Ω
2k
6k
1k
0.02Ω
Q29
1k
2.4k
500Ω
100Ω
VIN
LT1033 • SC01
1033fc
8
LT1033
U
W
PROGRAM RESISTOR SELECTIO
The following table allows convenient selection of
program resistors from standard 1% values.
OUTPUT ERROR
(%)
VOUT
R1
5
100
301
0.6
6
121
453
–0.7
8
115
619
0.6
R2
10
115
806
0.6
12
118
1020
1.0
15
100
1100
0.5
18
150
2000
0.2
20
121
1820
0.8
22
130
2150
0.2
24
121
2210
0.9
28
115
2430
–0.7
30
121
2740
–0.9
U
PACKAGE DESCRIPTION
K Package
2-Lead TO-3 Metal Can
(Reference LTC DWG # 05-08-1310)
0.760 – 0.775
(19.30 – 19.69)
0.320 – 0.350
(8.13 – 8.89)
0.060 – 0.135
(1.524 – 3.429)
0.420 – 0.480
(10.67 – 12.19)
0.038 – 0.043
(0.965 – 1.09)
1.177 – 1.197
(29.90 – 30.40)
0.655 – 0.675
(16.64 – 17.15)
0.210 – 0.220
(5.33 – 5.59)
0.151 – 0.161
(3.86 – 4.09)
DIA, 2PLCS
0.167 – 0.177
(4.24 – 4.49)
R
0.425 – 0.435
(10.80 – 11.05)
0.067 – 0.077
(1.70 – 1.96)
0.490 – 0.510
(12.45 – 12.95)
R
OBSOLETE
PACKAGE
K2 (TO-3) 1098
1033fc
9
LT1033
U
PACKAGE DESCRIPTION
T Package
3-Lead Plastic TO-220
(Reference LTC DWG # 05-08-1420)
0.147 – 0.155
(3.734 – 3.937)
DIA
0.390 – 0.415
(9.906 – 10.541)
0.165 – 0.180
(4.191 – 4.572)
0.045 – 0.055
(1.143 – 1.397)
0.230 – 0.270
(5.842 – 6.858)
0.460 – 0.500
(11.684 – 12.700)
0.570 – 0.620
(14.478 – 15.748)
0.330 – 0.370
(8.382 – 9.398)
0.980 – 1.070
(24.892 – 27.178)
0.520 – 0.570
(13.208 – 14.478)
0.100
(2.540)
BSC
0.218 – 0.252
(5.537 – 6.401)
0.013 – 0.023
(0.330 – 0.584)
0.028 – 0.038
(0.711 – 0.965)
0.050
(1.270)
TYP
0.095 – 0.115
(2.413 – 2.921)
T3 (TO-220) 1098
1033fc
10
LT1033
U
PACKAGE DESCRIPTION
P Package
3-Lead Plastic TO-3P (Similar to TO-247)
(Reference LTC DWG # 05-08-1450)
0.560
(14.224)
0.325
(8.255)
0.580
(14.732)
0.700
(17.780)
0.830 – 0.870
(21.08 – 22.10)
0.580 – 0.6OO
(14.73 – 15.24)
0.098
(2.489)
0.124
(3.149)
0.187 – 0.207
(4.75 – 5.26)
0.620 – 0.64O
(15.75 – 16.26)
0.275
(6.985)
MOUNTING HOLE
18° – 22°
0.115 – 0.145
(2.92 – 3.68)
DIA
0.060 – 0.080
(1.52 – 2.03)
0.170 – 0.2OO
(4.32 – 5.08)
EJECTOR PIN MARKS
0.105 – 0.125
(2.67 – 3.18)
DIA
3° – 7°
0.170
(4.32)
MAX
0.780 – 0.800
(19.81 – 20.32)
BOTTOM VIEW OF TO-3P
HATCHED AREA IS SOLDER PLATED
COPPER HEAT SINK
0.042 – 0.052
(1.07 – 1.32)
0.074 – 0.084
(1.88 – 2.13)
0.215
(5.46)
BSC
0.113 – 0.123
(2.87 – 3.12)
0.087 – 0.102
(2.21 – 2.59)
0.020 – 0.040
(0.51 – 1.02)
P3 0996
1033fc
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
11
LT1033
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1120
125mA Low Dropout Regulator with 20µA IQ
Includes 2.5V Reference and Comparator
LT1121
150mA Micropower Low Dropout Regulator
30µA IQ, SOT-223 Package
LT1129
700mA Micropower Low Dropout Regulator
50µA Quiescent Current
LT1175
500mA Negative Low Dropout Micropower Regulator
45µA IQ, 0.26V Dropout Voltage, SOT-223 Package
LT1374
4.5A, 500kHz Step-Down Converter
4.5A, 0.07Ω Internal Switch, SO-8 Package
LT1521
300mA Low Dropout Micropower Regulator with Shutdown
15µA IQ, Reverse Battery Protection
LT1529
3A Low Dropout Regulator with 50µA IQ
500mV Dropout Voltage
LT1573
UltraFast™ Transient Response Low Dropout Regulator
Drives External PNP
LT1575
UltraFast Transient Response Low Dropout Regulator
Drives External N-Channel MOSFET
LT1735
Synchronous Step-Down Converter
High Efficiency, OPTI-LOOP® Compensation
LT1761 Series
100mA, Low Noise, Low Dropout Micropower Regulators in SOT-23
20µA Quiescent Current, 20µVRMS Noise, SOT-23 Package
LT1762 Series
150mA, Low Noise, LDO Micropower Regulators
25µA Quiescent Current, 20µVRMS Noise, MSOP Package
LT1763 Series
500mA, Low Noise, LDO Micropower Regulators
30µA Quiescent Current, 20µVRMS Noise, SO-8 Package
LT1764
3A, Low Noise, Fast Transient Response LDO
40µVRMS Noise
LT1962
300mA, Low Noise, LDO Micropower Regulator
20µVRMS Noise, MSOP Package
LT1963
1.5A, Low Noise, Fast Transient Response LDO
40µVRMS Noise, SOT-223 Package
OPTI-LOOP is a registered trademark of Linear Technology Corporation. UltraFast is a trademark of Linear Technology Corporation.
1033fc
12
Linear Technology Corporation
LT/CPI 0102 1.5K REV C • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507
●
www.linear.com
 LINEAR TECHNOLOGY CORPORATION 1991