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Linear Technology Electronic Components Datasheet

LT1964 Datasheet

Low Dropout Negative Micropower Regulator

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LT1964
200mA, Low Noise,
Low Dropout Negative
Micropower Regulator
FEATURES
n Low Noise: 30μVRMS (10Hz to 100kHz)
n Low Quiescent Current: 30μA
n Low Dropout Voltage: 340mV
n Output Current: 200mA
n Fixed Output Voltage: –5V
n Adjustable Output from –1.22V to – 20V
n Positive or Negative Shutdown Logic
n 3μA Quiescent Current in Shutdown
n Stable with 1μF Output Capacitor
n Stable with Aluminum, Tantalum, or Ceramic
Capacitors
n Thermal Limiting
n Low Profile (1mm) ThinSOT™ and (0.75mm) 8-Pin
3mm × 3mm DFN Packages
APPLICATIONS
n Battery-Powered Instruments
n Low Noise Regulator for Noise-Sensitive
Instrumentation
n Negative Complement to LT1761 Family of
Positive LDOs
TYPICAL APPLICATION
–5V Low Noise Regulator
DESCRIPTION
The LT®1964 is a micropower low noise, low dropout nega-
tive regulator. The device is capable of supplying 200mA
of output current with a dropout voltage of 340mV. Low
quiescent current (30μA operating and 3μA shutdown)
makes the LT1964 an excellent choice for battery-pow-
ered 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 volt-
age. The LT1964 regulators are available in a low profile
(1mm) ThinSOT and the low profile (0.75mm) 8-pin
(3mm × 3mm) DFN packages.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. ThinSOT is
a trademark of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
10Hz to 100kHz Output Noise
VIN
–5.4V
TO –20V
1μF
GND
SHDN BYP
LT1964-5
IN OUT
10μF
0.01μF
–5V AT 200mA
30μVRMS NOISE
1964 TA01a
VOUT
100μV/DIV
30μVRMS
1ms/DIV
1964 TA01b
1964fb
1


Linear Technology Electronic Components Datasheet

LT1964 Datasheet

Low Dropout Negative Micropower Regulator

No Preview Available !

LT1964
ABSOLUTE MAXIMUM RATINGS
(Note 1)
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
SHDN Pin Voltage
(with Respect to GND Pin)..........................–20V, 15V
Output Short-Circuit Duration .......................... Indefinite
Operating Junction Temperature (E, I Grade)
Range (Note 10) ............................... – 40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
SOT-23 Package................................................ 300°C
PIN CONFIGURATION
LT1964
TOP VIEW
OUT 1
8 IN
OUT 2
7 IN
9
ADJ 3
6 GND
SHDN 4
5 BYP
LT1964-BYP
DD PACKAGE
8-LEAD (3mm s 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 40°C/W, θJC = 16°C/W
(NOTE 13)
EXPOSED PAD (PIN 9) IS IN, MUST BE SOLDERED TO PCB
GND 1
IN 2
BYP 3
TOP VIEW
5 OUT
4 ADJ
S5 PACKAGE
5-LEAD PLASTIC SOT-23
TJMAX = 150°C, θJA ≈125°C/W to 250°C/W
(NOTE 13)
SEE THE APPLICATIONS INFORMATION SECTION
LT1964-SD
LT1964-5
TOP VIEW
GND 1
IN 2
SHDN 3
5 OUT
4 ADJ
S5 PACKAGE
5-LEAD PLASTIC SOT-23
TJMAX = 150°C, θJA ≈125°C/W to 250°C/W
(NOTE 13)
SEE THE APPLICATIONS INFORMATION SECTION
GND 1
IN 2
BYP 3
TOP VIEW
5 OUT
4 SHDN
S5 PACKAGE
5-LEAD PLASTIC SOT-23
TJMAX = 150°C, θJA ≈125°C/W to 250°C/W
(NOTE 13)
SEE THE APPLICATIONS INFORMATION SECTION
ORDER INFORMATION
LEAD FREE FINISH
LT1964ES5-SD#PBF
LT1964ES5-BYP#PBF
LT1964ES5-5#PBF
LT1964EDD#PBF
LT1964IS5-SD#PBF
LT1964IS5-BYP#PBF
LT1964IS5-5#PBF
LT1964IDD#PBF
TAPE AND REEL
LT1964ES5-SD#TRPBF
LT1964ES5-BYP#TRPBF
LT1964ES5-5#TRPBF
LT1964EDD#TRPBF
LT1964IS5-SD#TRPBF
LT1964IS5-BYP#TRPBF
LT1964IS5-5#TRPBF
LT1964IDD#TRPBF
PART MARKING*
LTVX
LTVY
LTVZ
LDVM
LTVX
LTVY
LTVZ
LDVM
2
PACKAGE DESCRIPTION
5-Lead Plastic SOT-23
5-Lead Plastic SOT-23
5-Lead Plastic SOT-23
8-Lead (3mm × 3mm) Plastic DFN
5-Lead Plastic SOT-23
5-Lead Plastic SOT-23
5-Lead Plastic SOT-23
8-Lead (3mm × 3mm) Plastic DFN
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
1964fb


Part Number LT1964
Description Low Dropout Negative Micropower Regulator
Maker Linear Technology
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LT1964 Datasheet PDF






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