LT1964
200mA, Low Noise,
Low Dropout Negative
Micropower Regulator in ThinSOT
FEATURES
s
s
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DESCRIPTIO
s
Low Profile (1mm) ThinSOT
TM
Package
Low Noise: 30µV
RMS
(10Hz to 100kHz)
Low Quiescent Current: 30µA
Low Dropout Voltage: 340mV
Output Current: 200mA
Fixed Output Voltage: –5V
Adjustable Output from –1.22V to – 20V
Positive or Negative Shutdown Logic
3µA Quiescent Current in Shutdown
Stable with 1µF Output Capacitor
Stable with Aluminum, Tantalum, or Ceramic
Capacitors
Thermal Limiting
The LT
®
1964 is a micropower low noise, low dropout
negative regulator. The device is capable of supplying
200mA of output current with a dropout voltage of 340mV.
Low quiescent current (30µA operating and 3µA shut-
down) makes the LT1964 an excellent choice for battery-
powered applications. Quiescent current is well controlled
in dropout.
Other features of the LT1964 include low output noise.
With the addition of an external 0.01µF bypass capacitor,
output noise is reduced to 30µV
RMS
over a 10Hz to 100kHz
bandwidth. The LT1964 is capable of operating with small
capacitors and is stable with output capacitors as low as
1µF. Small ceramic capacitors can be used without the
necessary addition of ESR as is common with other
regulators. Internal protection circuitry includes reverse
output protection, current limiting, and thermal limiting.
The device is available with a fixed output voltage of –5V
and as an adjustable device with a –1.22V reference
voltage. The LT1964 regulators are available in a low
profile (1mm) ThinSOT package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
APPLICATIO S
s
s
s
Battery-Powered Instruments
Low Noise Regulator for Noise-Sensitive
Instrumentation
Negative Complement to LT1761 Family of
Positive LDOs
TYPICAL APPLICATIO
10Hz to 100kHz Output Noise
–5V Low Noise Regulator
1µF
V
IN
–5.4V
TO –20V
10µF
BYP
0.01µF
V
OUT
100µV/DIV
30µV
RMS
GND
SHDN
LT1964-5
IN
OUT
–5V AT 200mA
30µV
RMS
NOISE
1964 TA01a
U
1ms/DIV
1964 TA01b
U
U
1964f
1
LT1964
ABSOLUTE
AXI U RATI GS
(Note 1)
SHDN Pin Voltage
(with Respect to GND Pin) ........................ –20V, 15V
Output Short-Circuit Duration .......................... Indefinite
Operating Junction Temperature
Range (Note 10) ............................... – 40°C to 125°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
IN Pin Voltage ........................................................
±20V
OUT Pin Voltage (Note 11) ....................................
±20V
OUT to IN Differential Voltage (Note 11) ....... –0.5V, 20V
ADJ Pin Voltage
(with Respect to IN Pin) (Note 11) ........... –0.5V, 20V
BYP Pin Voltage
(with Respect to IN Pin) ...................................
±20V
SHDN Pin Voltage
(with Respect to IN Pin) (Note 11) ........... –0.5V, 35V
PACKAGE/ORDER I FOR ATIO
TOP VIEW
GND 1
IN 2
SHDN 3
4 ADJ
5 OUT
ORDER PART
NUMBER
LT1964ES5-SD
S5 PART MARKING
LTVX
ORDER PART
NUMBER
LT1964ES5-BYP
S5 PART MARKING
LTVY
GND 1
IN 2
BYP 3
4 SHDN
TOP VIEW
5 OUT
S5 PACKAGE
5-LEAD PLASTIC SOT-23
T
JMAX
= 150°C,
θ
JA
≈125°C/W
to 250°C/W
(NOTE 13)
SEE THE APPLICATIONS INFORMATION SECTION
TOP VIEW
GND 1
IN 2
BYP 3
4 ADJ
5 OUT
S5 PACKAGE
5-LEAD PLASTIC SOT-23
T
JMAX
= 150°C,
θ
JA
≈125°C/W
to 250°C/W
(NOTE 13)
SEE THE APPLICATIONS INFORMATION SECTION
Consult LTC Marketing for parts specified with wider operating temperature ranges.
The
q
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
PARAMETER
Regulated Output Voltage
(Notes 3, 9)
ADJ Pin Voltage
(Notes 2, 3, 9)
Line Regulation
Load Regulation
CONDITIONS
LT1964-5
LT1964
LT1964-5
LT1964 (Note 2)
LT1964-5
LT1964
V
IN
= –5.5V, I
LOAD
= – 1mA
–20V < V
IN
< –6V, –200mA < I
LOAD
< –1mA
V
IN
= –2V, I
LOAD
= – 1mA
–20V < V
IN
< –2.8V, –200mA < I
LOAD
< –1mA
∆V
IN
= –5.5V to –20V, I
LOAD
= – 1mA
∆V
IN
= –2.8V to –20V, I
LOAD
= – 1mA
V
IN
= –6V,
∆I
LOAD
= – 1mA to –200mA
V
IN
= –6V,
∆I
LOAD
= – 1mA to –200mA
V
IN
= –2.8V,
∆I
LOAD
= – 1mA to –200mA
V
IN
= –2.8V,
∆I
LOAD
= – 1mA to –200mA
MIN
–4.925
q
–4.850
–1.202
q
–1.184
q
q
q
ELECTRICAL CHARACTERISTICS
2
U
U
W
W W
U
W
ORDER PART
NUMBER
LT1964ES5-5
S5 PART MARKING
LTVZ
S5 PACKAGE
5-LEAD PLASTIC SOT-23
T
JMAX
= 150°C,
θ
JA
≈125°C/W
to 250°C/W
(NOTE 13)
SEE THE APPLICATIONS INFORMATION SECTION
TYP
–5
–5
–1.22
–1.22
15
1
15
2
MAX
–5.075
–5.150
–1.238
–1.256
50
12
35
50
7
15
UNITS
V
V
V
V
mV
mV
mV
mV
mV
mV
1964f
q
LT1964
The
q
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
PARAMETER
Dropout Voltage
V
IN
= V
OUT(NOMINAL)
(Notes 4, 5)
CONDITIONS
I
LOAD
= – 1mA
I
LOAD
= – 1mA
I
LOAD
= – 10mA
I
LOAD
= – 10mA
I
LOAD
= – 100mA
I
LOAD
= – 100mA
I
LOAD
= – 200mA
I
LOAD
= – 200mA
GND Pin Current
V
IN
= V
OUT(NOMINAL)
(Notes 4, 6)
I
LOAD
= 0mA
I
LOAD
= – 1mA
I
LOAD
= – 10mA
I
LOAD
= – 100mA
I
LOAD
= – 200mA
C
OUT
= 10µF, C
BYP
= 0.01µF, I
LOAD
= –200mA, BW = 10Hz to 100kHz
(Notes 2, 7)
LT1964-BYP
LT1964-SD
V
OUT
= Off to On (Positive)
V
OUT
= Off to On (Negative)
V
OUT
= On to Off (Positive)
V
OUT
= On to Off (Negative)
V
SHDN
= 0V
V
SHDN
= 15V
V
SHDN
= –15V
V
IN
= –6V, V
SHDN
= 0V
V
IN
– V
OUT
= –1.5V(Avg), V
RIPPLE
= 0.5V
P-P
,
f
RIPPLE
= 120Hz, I
LOAD
= –200mA
V
IN
= –6V, V
OUT
= 0V
V
IN
= V
OUT(NOMINAL)
–1.5V,
∆V
OUT
= 0.1V
V
IN
= 20V, V
OUT
, V
ADJ
, V
SHDN
= Open Circuit
q
q
q
q
q
q
q
q
q
q
ELECTRICAL CHARACTERISTICS
MIN
TYP
0.1
0.15
MAX
0.15
0.19
0.20
0.25
0.33
0.39
0.42
0.49
70
180
600
3
6
100
–2.8
–2.2
2.1
–2.8
UNITS
V
V
V
V
V
V
V
V
µA
µA
µA
mA
mA
µV
RMS
nA
V
V
V
V
V
V
µA
µA
µA
µA
dB
mA
mA
q
0.26
q
0.34
q
q
q
q
q
q
30
85
300
1.3
2.5
30
30
–1.9
–1.6
1.6
–1.9
0.8
–0.8
±0.1
6
–3
3
46
54
350
220
Output Voltage Noise
ADJ Pin Bias Current
Minimum Input Voltage (Note 12)
I
LOAD
= –200mA
Shutdown Threshold
0.25
–0.25
–1
SHDN Pin Current (Note 8)
1
15
–9
10
Quiescent Current in Shutdown
Ripple Rejection
Current Limit
Input Reverse Leakage Current
1
mA
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
The LT1964 (adjustable version) is tested and specified for these
conditions with the ADJ pin connected to the OUT pin.
Note 3:
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 4:
To satisfy requirements for minimum input voltage, the LT1964
(adjustable version) is tested and specified for these conditions with an
external resistor divider (two 249k resistors) for an output voltage of
–2.44V. The external resistor divider will add a 5µA DC load on the output.
Note 5:
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
IN
+ V
DROPOUT
).
Note 6:
GND pin current is tested with V
IN
= V
OUT(NOMINAL)
and a current
source load. This means the device is tested while operating in its dropout
region. This is the worst-case GND pin current. The GND pin current will
decrease slightly at higher input voltages.
Note 7:
ADJ pin bias current flows out of the ADJ pin.
Note 8:
Positive SHDN pin current flows into the SHDN pin. SHDN pin
current is included in the GND pin current specification.
Note 9:
For input-to-output differential voltages greater than 7V, a 50µA
load is needed to maintain regulation.
Note 10:
The LT1964E is guaranteed to meet performance specifications
from 0°C to 125°C. Specifications over the –40°C to 125°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls.
Note 11:
A parasitic diode exists internally on the LT1964 between the
OUT, ADJ and SHDN pins and the IN pin. The OUT, ADJ and SHDN pins
cannot be pulled more than 0.5V more negative than the IN pin during
fault conditions, and must remain at a voltage more positive than the IN
pin during operation.
Note 12:
For the LT1964-BYP, this specification accounts for the operating
threshold of the SHDN pin, which is tied to the IN pin internally. For the
LT1964-SD, the SHDN threshold must be met to ensure device operation.
Note 13:
Actual thermal resistance (θ
JA
) junction to ambient will be a
function of board layout. Junction-to-case thermal resistance (θ
JC
)
measured at Pin 2 is 60°C/W. See the Thermal Considerations section in
the Applications Information.
1964f
3
LT1964
TYPICAL PERFOR A CE CHARACTERISTICS
Typical Dropout Voltage
500
450
500
450
DROPOUT VOLTAGE (mV)
DROPOUT VOLTAGE (mV)
350
300
250
200
150
100
50
0
0
–40
–80
–120
–160
OUTPUT CURRENT (mA)
–200
1964 G01
350
300
250
200
150
100
50
0
0
–40
–80
–120
–160
OUTPUT CURRENT (mA)
–200
1964 G02
DROPOUT VOLTAGE (mV)
400
T
J
= 125°C
T
J
= 25°C
Quiescent Current
–50
–45
V
IN
= –6V
R
L
= 250k (∞ FOR LT1964-5)
I
L
= –5µA (0 FOR LT1964-5)
–5.12
–5.09
QUIESCENT CURRENT (µA)
–40
–35
–30
–25
–20
–15
–10
–5
0
–50
OUTPUT VOLTAGE (V)
V
SHDN
= V
IN
–5.03
–5.00
–4.97
–4.94
–4.91
ADJ PIN VOLTAGE (V)
V
SHDN
= 0V
–25
0
25
50
75
TEMPERATURE (°C)
100
125
LT1964-5
Quiescent Current
–40
–35
QUIESCENT CURRENT (µA)
T
J
= 25°C
R
L
=
∞
GND PIN CURRENT (mA)
–30
–25
–20
–15
–10
–5
–0
0
V
SHDN
= 0V
QUIESCENT CURRENT (µA)
V
SHDN
= V
IN
–1 –2 –3 –4 –5 –6 –7 –8 –9 –10
INPUT VOLTAGE (V)
1964 G07
4
U W
1964 G04
Guaranteed Dropout Voltage
= TEST POINT
T
J
≤
125°C
500
450
400
350
300
250
200
150
100
50
Dropout Voltage
400
I
L
= –200mA
I
L
= –100mA
I
L
= –50mA
I
L
= –10mA
I
L
= –1mA
T
J
≤
25°C
0
–50
–25
0
25
50
75
TEMPERATURE (°C)
100
125
1964 G03
LT1964-5 Output Voltage
–1.240
I
L
= –1mA
–1.235
–1.230
–1.225
–1.220
–1.215
–1.210
–1.205
–25
0
25
50
75
TEMPERATURE (°C)
100
125
LT1964-BYP, LT1964-SD
ADJ Pin Voltage
I
L
= –1mA
–5.06
–4.88
–50
–1.200
–50
–25
0
25
50
75
TEMPERATURE (°C)
100
125
1964 G05
1964 G06
LT1964-BYP, LT1964-SD
Quiescent Current
–40
–35
–30
–25
–20
–15
–10
–5
–0
0
V
SHDN
= 0V
T
J
= 25°C
R
L
= 250k
I
L
= –5µA
V
SHDN
= V
IN
–3.0
–2.5
–2.0
–1.5
–1.0
–0.5
0
LT1964-5
GND Pin Current
T
J
= 25°C
V
SHDN
= V
IN
*FOR V
OUT
= –5V
R
L
= 25
I
L
= –200mA*
R
L
= 50
I
L
= –100mA*
R
L
= 100
I
L
= –50mA*
R
L
= 500
I
L
= –10mA*
0
–1 –2 –3 –4 –5 –6 –7 –8 –9 –10
INPUT VOLTAGE (V)
1964 G09
–1 –2 –3 –4 –5 –6 –7 –8 –9 –10
INPUT VOLTAGE (V)
1964 G08
1964f
LT1964
TYPICAL PERFOR A CE CHARACTERISTICS
LT1964-BYP, LT1964-SD
GND Pin Current
–3.0
–2.5
GND PIN CURRENT (mA)
T
J
= 25°C; V
SHDN
= V
IN
; *FOR V
OUT
= –1.22V
R
L
= 6.1Ω
I
L
= –200mA*
R
L
= 12.2Ω
I
L
= –100mA*
R
L
= 24.4Ω
I
L
= –50mA*
R
L
= 122Ω
I
L
= –10mA*
GND PIN CURRENT (mA)
SHDN PIN VOLTAGE (V)
–2.0
–1.5
–1.0
–0.5
0
0
–1 –2 –3 –4 –5 –6 –7 –8 –9 –10
INPUT VOLTAGE (V)
1964 G10
SHDN Pin Input Current
10
8
SHDN PIN INPUT CURRENT (µA)
SHDN PIN INPUT CURRENT (µA)
4
2
0
–2
–4
–6
–8
–10
–10 –8 –6 –4 –2 0 2 4 6
SHDN PIN VOLTAGE (V)
8
10
6
V
SHDN
= 15V
3
0
–3
–6
–9
–50
V
SHDN
= –15V
ADJ PIN BIAS CURRENT (nA)
6
T
J
= 25°C
POSITIVE CURRENT
FLOWS INTO THE PIN
Current Limit
–600
∆V
OUT
= 100mV
–500
CURRENT LIMIT (mA)
–400
–300
–200
–100
0
–400
–300
–200
–100
0
–50
RIPPLE REJECTION (dB)
CURRENT LIMIT (mA)
0
–4
–8
–12
–16
INPUT/OUTPUT DIFFERENTIAL (V)
U W
1964 G13
GND Pin Current vs I
LOAD
–4.0
–3.5
–3.0
–2.5
–2.0
–1.5
–1.0
–0.5
0
0
–40
–80
–120
–160
OUTPUT CURRENT (mA)
–200
1964 G11
SHDN Pin Thresholds
2.5
2.0
ON
V
IN
= V
OUT(NOMINAL)
– 1V
T
J
= –50°C
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
–2.5
–50
–25
0
25
50
75
TEMPERATURE (°C)
ON
OFF
T
J
= 25°C
T
J
= 125°C
100
125
1964 G12
SHDN Pin Input Current
12
9
V
IN
= –15V
POSITIVE CURRENT
FLOWS INTO THE PIN
–70
–60
–50
–40
–30
–20
–10
ADJ Pin Bias Current
–25
0
25
50
75
TEMPERATURE (°C)
100
125
0
–50
–25
0
25
50
75
TEMPERATURE (°C)
100
125
1964 G14
1964 G15
Current Limit
–600
–500
V
IN
= –7V
V
OUT
= 0V
80
70
60
50
40
30
20
10
Input Ripple Rejection
I
L
= –200mA
V
IN
= V
OUT(NOMINAL)
– 1V +
50mV
RMS
RIPPLE
C
BYP
= 0
C
OUT
= 10µF
C
OUT
= 1µF
10
100
1k
10k
FREQUENCY (Hz)
100k
1M
1964 G18
–20
1964 G16
–25
0
25
50
75
TEMPERATURE (°C)
100
125
0
1964 G17
1964f
5
单片机
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