FEATURES
■
Optimized for Fast Transient Response
■
Output Current: 1.5A
■
Dropout Voltage: 340mV
■
Low Noise: 40µV
■
1mA Quiescent Current
■
No Protection Diodes Needed
■
Controlled Quiescent Current in Dropout
■
Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 3.3V
■
Adjustable Output from 1.21V to 20V
■
<1µA Quiescent Current in Shutdown
■
Stable with 10µF Output Capacitor
■
Reverse Battery Protection
■
No Reverse Current
■
Thermal Limiting
■
5-Lead TO-220, DD, 3-Lead SOT-223, 8-Lead SO
(10Hz to 100kHz)
RMS
and 16-Lead TSSOP Packages
U
APPLICATIO S
■
3.3V to 2.5V Logic Power Supplies
■
Post Regulator for Switching Supplies
LT1963 Series
1.5A, Low Noise,
Fast Transient Response
LDO Regulators
U
DESCRIPTIO
The LT
for fast transient response. The devices are capable of
supplying 1.5A of output current with a dropout voltage of
340mV. Operating quiescent current is 1mA, dropping to
<1µA in shutdown. Quiescent current is well controlled; it
does not rise in dropout as it does with many other
regulators. In addition to fast transient response, the
LT1963 regulators have very low output noise which
makes them ideal for sensitive RF supply applications.
Output voltage range is from 1.21V to 20V. The LT1963
regulators are stable with output capacitors as low as
10µF. Internal protection circuitry includes reverse battery
protection, current limiting, thermal limiting and reverse
current protection. The devices are available in fixed
output voltages of 1.5V, 1.8V, 2.5V, 3.3V and as an
adjustable device with a 1.21V reference voltage. The
LT1963 regulators are available in 5-lead TO-220, DD,
3-lead SOT-223, 8-lead SO, and Exposed Pad 16-lead
TSSOP packages.
®
1963 series are low dropout regulators optimized
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Protected by U.S. Patents,
including 6118263, 6144250.
TYPICAL APPLICATION
3.3V to 2.5V Regulator
IN
V
> 3V
IN
10µF
SHDN
OUT
LT1963-2.5
SENSE
GND
U
Dropout Voltage
400
350
300
2.5V
++
1.5A
10µF
1963 TA01
250
200
150
DROPOUT VOLTAGE (mV)
100
50
0
0.2
0
0.4
OUTPUT CURRENT (A)
0.6
0.8
1.0
1.2
1.4
1963 TA02
1.6
1963fc
1
LT1963 Series
1
2
3
4
8
7
6
5
TOP VIEW
IN
GND
GND
SHDN
OUT
SENSE/ADJ*
GND
NC
S8 PACKAGE
8-LEAD PLASTIC SO
FE PACKAGE
16-LEAD PLASTIC TSSOP
EXPOSED PAD (PIN 17) IS GND. MUST BE
SOLDERED TO THE PCB.
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
GND
NC
OUT
OUT
OUT
SENSE/ADJ*
GND
GND
GND
NC
IN
IN
IN
NC
SHDN
GND
17
WWWU
ABSOLUTE AXI U RATI GS
(Note 1)
IN Pin Voltage ........................................................ ± 20V
OUT Pin Voltage .................................................... ±20V
Input to Output Differential Voltage (Note 2) ......... ±20V
SENSE Pin Voltage ............................................... ±20V
ADJ Pin Voltage ...................................................... ±7V
UU
W
PACKAGE/ORDER I FOR ATIO
FRONT VIEW
5
SENSE/ADJ*
4
TAB IS
GND
Q PACKAGE
5-LEAD PLASTIC DD
*PIN 5 = SENSE FOR LT1963-1.5/LT1963-1.8/
LT1963-2.5/LT1963-3.3
= ADJ FOR LT1963
T
= 150°C, θJA = 30°C/ W
JMAX
OUT
3
GND
2
IN
1
SHDN
ORDER PART NUMBER
LT1963EQ
LT1963EQ-1.5
LT1963EQ-1.8
LT1963EQ-2.5
LT1963EQ-3.3
TAB IS
GND
*PIN 5 = SENSE FOR LT1963-1.5/LT1963-1.8/
ORDER PART NUMBER
FRONT VIEW
5
4
3
2
1
T PACKAGE
5-LEAD PLASTIC TO-220
LT1963-2.5/LT1963-3.3
= ADJ FOR LT1963
= 150°C, θJA = 50°C/ W
T
JMAX
LT1963ET
LT1963ET-1.5
LT1963ET-1.8
LT1963ET-2.5
LT1963ET-3.3
SHDN Pin Voltage ................................................. ± 20V
Output Short-Circuit Duration ......................... Indefinite
Operating Junction Temperature Range –40°C to 125°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)..................300°C
SENSE/
ADJ*
OUT
GND
IN
SHDN
T
= 150°C, θJA = 38°C/ W
JMAX
*PIN 6 = SENSE FOR LT1963-1.5/
LT1963-1.8/LT1963-2.5/
LT1963-3.3
= ADJ FOR LT1963
ORDER PART NUMBER FE PART MARKING
LT1963EFE
LT1963EFE-1.5
LT1963EFE-1.8
LT1963EFE-2.5
LT1963EFE-3.3
1963EFE
1963EFE15
1963EFE18
1963EFE25
1963EFE33
ORDER PART NUMBER
LT1963EST-1.5
LT1963EST-1.8
LT1963EST-2.5
LT1963EST-3.3
Order Options
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
2
TAB IS
GND
3-LEAD PLASTIC SOT-223
T
JMAX
Tape and Reel: Add #TR
FRONT VIEW
3
OUT
2
GND
1
IN
ST PACKAGE
= 150°C, θJA = 50°C/ W
ST PART MARKING
196315
196318
196325
196333
*PIN 2 = SENSE FOR LT1963-1.5/LT1963-1.8/
LT1963-2.5/LT1963-3.3
= ADJ FOR LT1963
T
= 150°C, θJA = 70°C/ W
JMAX
ORDER PART NUMBER S8 PART MARKING
LT1963ES8
LT1963ES8-1.5
LT1963ES8-1.8
LT1963ES8-2.5
LT1963ES8-3.3
1963
196315
196318
196325
196333
1963fc
LT1963 Series
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. (Note 3)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage (Notes 4,12) I
Regulated Output Voltage (Note 5) LT1963-1.5 VIN = 2.21V, I
ADJ Pin Voltage LT1963 VIN = 2.21V, I
(Notes 4, 5) 2.5V < V
Line Regulation LT1963-1.5 ∆VIN = 2.21V to 20V, I
Load Regulation LT1963-1.5 VIN = 2.5V, ∆I
Dropout Voltage I
= V
V
IN
OUT(NOMINAL)
(Notes 6, 7, 12)
GND Pin Current I
= V
V
IN
OUT(NOMINAL)
+ 1V I
(Notes 6, 8)
Output Voltage Noise C
ADJ Pin Bias Current (Notes 4, 9) 3 10 µA
Shutdown Threshold V
SHDN Pin Current V
(Note 10) V
Quiescent Current in Shutdown VIN = 6V, V
Ripple Rejection VIN – V
= 0.5A 1.9 V
LOAD
= 1.5A 2.5V < VIN < 20V, 1mA < I
I
LOAD
= 1mA 1.477 1.500 1.523 V
LOAD
2.5V < V
LT1963-1.8 VIN = 2.3V, I
2.8V < V
LT1963-2.5 VIN = 3V, I
3.5V < V
LT1963-3.3 VIN = 3.8V, I
4.3V < V
LT1963-1.8 ∆V
LT1963-2.5 ∆V
LT1963-3.3 ∆V
LT1963 (Note 4) ∆V
V
LT1963-1.8 VIN = 2.8V, ∆I
V
LT1963-2.5 VIN = 3.5V, ∆I
V
LT1963-3.3 VIN = 4.3V, ∆I
V
LT1963 (Note 4) VIN = 2.5V, ∆I
V
= 1mA 0.02 0.06 V
LOAD
I
= 1mA
LOAD
I
= 100mA 0.10 0.17 V
LOAD
= 100mA
I
LOAD
I
= 500mA 0.19 0.27 V
LOAD
I
= 500mA
LOAD
I
= 1.5A 0.34 0.45 V
LOAD
= 1.5A
I
LOAD
= 0mA
LOAD
= 1mA
LOAD
I
= 100mA
LOAD
= 500mA
I
LOAD
= 1.5A
I
LOAD
= 10µF, I
OUT
= Off to On
OUT
V
= On to Off
OUT
= 0V 0.01 1 µA
SHDN
= 20V 3 30 µA
SHDN
OUT
f
= 120Hz, I
RIPPLE
= 1.5A, BW = 10Hz to 100kHz 40 µV
LOAD
= 0V 0.01 1 µA
SHDN
= 1.5V (Avg), V
LOAD
< 20V, 1mA < I
IN
LOAD
< 20V, 1mA < I
IN
LOAD
< 20V, 1mA < I
IN
LOAD
< 20V, 1mA < I
IN
LOAD
< 20V, 1mA < I
IN
= 2.3V to 20V, I
IN
= 3V to 20V, I
IN
= 3.8V to 20V, I
IN
= 2.21V to 20V, I
IN
= 2.5V, ∆I
IN
= 2.8V, ∆I
IN
= 3.5V, ∆I
IN
= 4.3V, ∆I
IN
= 2.5V, ∆I
IN
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
RIPPLE
= 0.75A
= 1mA 1.773 1.800 1.827 V
= 1mA 2.462 2.500 2.538 V
= 1mA 3.250 3.300 3.350 V
= 1mA 1.192 1.210 1.228 V
LOAD
LOAD
LOAD
= 1mA to 1.5A 2 9 mV
= 1mA to 1.5A
= 1mA to 1.5A 2 10 mV
= 1mA to 1.5A
= 1mA to 1.5A 2.5 15 mV
= 1mA to 1.5A
= 1mA to 1.5A 3 20 mV
= 1mA to 1.5A
= 1mA to 1.5A 2 8 mV
= 1mA to 1.5A
= 0.5V
< 1.5A
LOAD
< 1.5A
LOAD
< 1.5A
LOAD
< 1.5A
LOAD
< 1.5A
LOAD
< 1.5A
LOAD
= 1mA
LOAD
= 1mA
= 1mA
= 1mA
= 1mA
LOAD
,5563dB
P-P
●
●
1.447 1.500 1.545 V
●
1.737 1.800 1.854 V
●
2.412 2.500 2.575 V
●
3.200 3.300 3.400 V
●
1.174 1.210 1.246 V
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
0.25 0.75 V
2.1 2.5 V
2.0 10 mV
2.5 10 mV
3.0 10 mV
3.5 10 mV
1.5 10 mV
18 mV
20 mV
30 mV
35 mV
15 mV
0.10 V
0.22 V
0.35 V
0.55 V
1.0 1.5 mA
1.1 1.6 mA
3.8 5.5 mA
15 25 mA
80 120 mA
0.90 2 V
RMS
1963fc
3
LT1963 Series
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. (Note 3)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Current Limit VIN = 7V, V
Input Reverse Leakage Current (Note 13) Q, T, S8 Packages VIN = – 20V, V
Reverse Output Current (Note 11) LT1963-1.5 V
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Absolute maximum input to output differential voltage can not be
achieved with all combinations of rated IN pin and OUT pin voltages. With
the IN pin at 20V, the OUT pin may not be pulled below 0V. The total
measured voltage from IN to OUT can not exceed ±20V.
Note 3: The LT1963 regulators are tested and specified under pulse load
conditions such that T
= 25°C. Performance at –40°C and 125°C is assured by design,
T
A
characterization and correlation with statistical process controls.
Note 4: The LT1963 (adjustable version) is tested and specified for these
conditions with the ADJ pin connected to the OUT pin.
Note 5: Operating conditions are limited by maximum junction
temperature. The regulated output voltage specification will not apply for
all possible combinations of input voltage and output current. When
operating at maximum input voltage, the output current range must be
limited. When operating at maximum output current, the input voltage
range must be limited.
Note 6: To satisfy requirements for minimum input voltage, the LT1963
(adjustable version) is tested and specified for these conditions with an
≈ TA. The LT1963 is 100% tested at
J
= V
V
IN
ST Package V
LT1963-1.8 V
LT1963-2.5 V
LT1963-3.3 V
LT1963 (Note 4) V
= 0V 2 A
OUT
OUT(NOMINAL)
+ 1V, ∆V
IN
= 1.5V, VIN < 1.5V 600 1200 µA
OUT
= 1.8V, VIN < 1.8V 600 1200 µA
OUT
= 2.5V, VIN < 2.5V 600 1200 µA
OUT
= 3.3V, VIN < 3.3V 600 1200 µA
OUT
= 1.21V, VIN < 1.21V 300 600 µA
OUT
= – 0.1V
OUT
OUT
= –20V, V
●
1.6 A
= 0V
= 0V
OUT
external resistor divider (two 4.12k resistors) for an output voltage of
2.4V. The external resistor divider will add a 300µA DC load on the output.
Note 7: Dropout voltage is the minimum input to output voltage differential
needed to maintain regulation at a specified output current. In dropout, the
output voltage will be equal to: V
Note 8: GND pin current is tested with V
current source load. The GND pin current will decrease at higher input
voltages.
Note 9: ADJ pin bias current flows into the ADJ pin.
Note 10: SHDN pin current flows into the SHDN pin.
Note 11: Reverse output current is tested with the IN pin grounded and the
OUT pin forced to the rated output voltage. This current flows into the OUT
pin and out the GND pin.
Note 12. For the LT1963, LT1963-1.5 and LT1963-1.8 dropout voltage will
be limited by the minimum input voltage specification under some output
voltage/load conditions.
Note 13. For the ST package, the input reverse leakage current increases
due to the additional reverse leakage current for the SHDN pin, which is
tied internally to the IN pin.
●
●
IN
– V
DROPOUT
= V
IN
.
OUT(NOMINAL)
1mA
2mA
+ 1V and a
4
1963fc
TEMPERATURE (°C)
–50
ADJ PIN VOLTAGE (V)
100
1963 G08
050
1.230
1.225
1.220
1.215
1.210
1.205
1.200
1.195
1.190
–25 25 75 125
IL = 1mA
UW
TEMPERATURE (°C)
–50
DROPOUT VOLTAGE (mV)
500
450
400
350
300
250
200
150
100
50
0
0
50
75
1963 G03
–25
25
100
125
IL = 100mA
IL = 1mA
IL = 0.5A
IL = 1.5A
TYPICAL PERFOR A CE CHARACTERISTICS
LT1963 Series
Typical Dropout Voltage Guaranteed Dropout Voltage
500
450
400
350
300
250
200
150
DROPOUT VOLTAGE (mV)
100
50
0
0
0.2 0.6
TJ = 125°C
TJ = 25°C
0.4
0.8
OUTPUT CURRENT (A)
1.0
1.2
1.4
1963 • G01
1.6
Quiescent Current LT1963-1.8 Output Voltage
1.4
1.2
LT1963-1.5/-1.8/-2.5/-3.3
1.0
0.8
0.6
0.4
QUIESCENT CURRENT (mA)
VIN = 6V
0.2
= ∞, IL = 0
R
L
= V
V
SHDN
0
–50
IN
–25 0
TEMPERATURE (°C)
LT1963
50 100 125
25 75
1963 G04
600
TEST POINTS
500
400
300
200
100
GUARANTEED DROPOUT VOLTAGE (mV)
0
0
0.2 0.6
TJ ≤ 125°C
0.4
0.8
OUTPUT CURRENT (A)
1.0
LT1963-1.5 Output Voltage
1.54
IL = 1mA
1.53
1.52
1.51
1.50
1.49
OUTPUT VOLTAGE (V)
1.48
1.47
1.46
–50
050
–25 25 75 125
TEMPERATURE (°C)
TJ ≤ 25°C
1.2
1.4
100
1.6
1963 • G02
1963 G04i
Dropout Voltage
1.84
IL = 1mA
1.83
1.82
1.81
1.80
1.79
OUTPUT VOLTAGE (V)
1.78
1.77
1.76
–25 25 75 125
–50
050
TEMPERATURE (°C)
100
1963 G05
LT1963-2.5 Output Voltage
2.58
IL = 1mA
2.56
2.54
2.52
2.50
2.48
OUTPUT VOLTAGE (V)
2.46
2.44
2.42
–50
050
–25 25 75 125
TEMPERATURE (°C)
100
1963 G06
LT1963-3.3 Output Voltage
3.38
IL = 1mA
3.36
3.34
3.32
3.30
3.28
OUTPUT VOLTAGE (V)
3.26
3.24
3.22
–50
050
–25 25 75 125
TEMPERATURE (°C)
LT1963 ADJ Pin Voltage
100
1963 G07
1963fc
5
LT1963 Series
UW
TYPICAL PERFOR A CE CHARACTERISTICS
LT1963-1.5 Quiescent Current
14
TJ = 25°C
= ∞
R
L
12
10
QUIESCENT CURRENT (mA)
= V
V
SHDN
IN
8
6
4
2
0
0
2
1
34
INPUT VOLTAGE (V)
LT1963-3.3 Quiescent Current
14
12
10
8
TJ = 25°C
= ∞
R
L
= V
V
SHDN
1963 G08i
LT1963-1.8 Quiescent Current LT1963-2.5 Quiescent Current
14
12
10
8
6
4
QUIESCENT CURRENT (mA)
2
0
1098765
0
2
1
34
INPUT VOLTAGE (V)
TJ = 25°C
= ∞
R
L
= V
V
SHDN
IN
5678910
1963 G09
LT1963 Quiescent Current
1.4
IN
1.2
1.0
0.8
TJ = 25°C
= 4.3k
R
L
= V
V
SHDN
IN
14
12
10
8
6
4
QUIESCENT CURRENT (mA)
2
0
0
2
1
34
INPUT VOLTAGE (V)
LT1963-1.5 GND Pin Current
25
TJ = 25°C
= V
V
SHDN
IN
*FOR V
20
15
OUT
= 1.5V
TJ = 25°C
= ∞
R
L
= V
V
SHDN
IN
1056789
1963 G10
6
4
QUIESCENT CURRENT (mA)
2
0
0
2
1
34
INPUT VOLTAGE (V)
1056789
1963 G11
0.6
0.4
QUIESCENT CURRENT (mA)
0.2
0
0
4
2
68
INPUT VOLTAGE (V)
1963 G12
10
GND PIN CURRENT (mA)
5
0
0
2010 12 14 16 18
19
RL = 5, IL = 300mA*
RL = 15, IL = 100mA*
RL = 150, IL = 10mA*
2
3
4
INPUT VOLTAGE (V)
5
LT1963-1.8 GND Pin Current LT1963-2.5 GND Pin Current LT1963-3.3 GND Pin Current
25
TJ = 25°C
= V
V
SHDN
IN
*FOR V
20
15
10
GND PIN CURRENT (mA)
5
0
0
= 1.8V
OUT
RL = 18, IL = 100mA*
RL = 180, IL = 10mA*
1
3
2
INPUT VOLTAGE (V)
RL = 6, IL = 300mA*
4
1963 G13
GND PIN CURRENT (mA)
1098765
25
20
15
10
5
0
0
RL = 8.33, IL = 300mA*
RL = 25, IL = 100mA*
RL = 250, IL = 10mA*
1
3
2
INPUT VOLTAGE (V)
TJ = 25°C
= V
V
SHDN
IN
*FOR V
4
OUT
= 2.5V
1963 G14
1098765
25
20
15
10
GND PIN CURRENT (mA)
5
0
0
RL = 330, IL = 100mA*
1
3
2
INPUT VOLTAGE (V)
RL = 11, IL = 300mA*
RL = 33, IL = 100mA*
4
6
7
TJ = 25°C
= V
V
SHDN
*FOR V
OUT
8
IN
= 3.3V
10
LT1963 G12i
1098765
1963 G15
1963fc
6
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