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What is LT1964?

This electronic component, produced by the manufacturer "Linear Technology", performs the same function as "200mA/ Low Noise/ Low Dropout Negative Micropower Regulator in ThinSOT".


LT1964 Datasheet PDF - Linear Technology

Part Number LT1964
Description 200mA/ Low Noise/ Low Dropout Negative Micropower Regulator in ThinSOT
Manufacturers Linear Technology 
Logo Linear Technology Logo 


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LT1964
200mA, Low Noise,
Low Dropout Negative
Micropower Regulator in ThinSOT
FEATURES
s Low Profile (1mm) ThinSOTTM Package
s Low Noise: 30µVRMS (10Hz to 100kHz)
s Low Quiescent Current: 30µA
s Low Dropout Voltage: 340mV
s Output Current: 200mA
s Fixed Output Voltage: –5V
s Adjustable Output from –1.22V to – 20V
s Positive or Negative Shutdown Logic
s 3µA Quiescent Current in Shutdown
s Stable with 1µF Output Capacitor
s Stable with Aluminum, Tantalum, or Ceramic
Capacitors
s Thermal Limiting
U
APPLICATIO S
s Battery-Powered Instruments
s Low Noise Regulator for Noise-Sensitive
Instrumentation
s Negative Complement to LT1761 Family of
Positive LDOs
DESCRIPTIO
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 30µVRMS 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.
TYPICAL APPLICATIO
–5V Low Noise Regulator
VIN
–5.4V
TO –20V
1µF
GND
SHDN BYP
LT1964-5
IN OUT
10µF
0.01µF
–5V AT 200mA
30µVRMS NOISE
1964 TA01a
10Hz to 100kHz Output Noise
VOUT
100µV/DIV
30µVRMS
1ms/DIV
1964 TA01b
1964f
1

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LT1964 equivalent
LT1964
TYPICAL PERFOR A CE CHARACTERISTICS
LT1964-BYP, LT1964-SD
GND Pin Current
–3.0
TJ = 25°C; VSHDN = VIN; *FOR VOUT = –1.22V
–2.5
RL = 6.1
IL = –200mA*
–2.0
RL = 12.2
–1.5 IL = –100mA*
RL = 24.4
–1.0 IL = –50mA*
RL = 122
–0.5 IL = –10mA*
0
0 –1 –2 –3 –4 –5 –6 –7 –8 –9 –10
INPUT VOLTAGE (V)
1964 G10
SHDN Pin Input Current
10
8 TJ = 25°C
POSITIVE CURRENT
6 FLOWS INTO THE PIN
4
2
0
–2
–4
–6
–8
–10
–10 –8 –6 –4 –2 0 2 4 6
SHDN PIN VOLTAGE (V)
8 10
1964 G13
Current Limit
–600
–500
VOUT = 100mV
–400
–300
–200
–100
0
0 –4 –8 –12 –16 –20
INPUT/OUTPUT DIFFERENTIAL (V)
1964 G16
GND Pin Current vs ILOAD
–4.0
VIN = VOUT(NOMINAL) – 1V
–3.5
–3.0 TJ = –50°C
–2.5
TJ = 25°C
–2.0
TJ = 125°C
–1.5
–1.0
–0.5
0
0 –40 –80 –120 –160 –200
OUTPUT CURRENT (mA)
1964 G11
SHDN Pin Input Current
12
VIN = –15V
9 POSITIVE CURRENT
FLOWS INTO THE PIN
6
VSHDN = 15V
3
0
VSHDN = –15V
–3
–6
–9
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1964 G14
Current Limit
–600
–500
VIN = –7V
VOUT = 0V
–400
–300
–200
–100
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1964 G17
SHDN Pin Thresholds
2.5
2.0
ON
1.5
1.0
0.5
0
OFF
–0.5
–1.0
–1.5
ON
–2.0
–2.5
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1964 G12
ADJ Pin Bias Current
–70
–60
–50
–40
–30
–20
–10
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1964 G15
Input Ripple Rejection
80
IL = –200mA
70 VIN = VOUT(NOMINAL) – 1V +
50mVRMS RIPPLE
60 CBYP = 0
50
40
COUT = 10µF
30
20
10
0
10
COUT = 1µF
100 1k 10k 100k
FREQUENCY (Hz)
1M
1964 G18
1964f
5


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1. - 200mA, Negative Micropower Regulator

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