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Analog Devices Semiconductor Electronic Components Datasheet

LT3094EDD Datasheet

Ultrahigh PSRR Negative Linear Regulator

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FEATURES
n Ultralow RMS Noise: 0.8µVRMS (10Hz to 100kHz)
n Ultralow Spot Noise: 2.2nV/√Hz at 10kHz
n Ultrahigh PSRR: 74dB at 1MHz
n Output Current: 500mA
n Wide Input Voltage Range: –1.8V to –20V
n Single Capacitor Improves Noise and PSRR
n 100µA SET Pin Current: ±1% Initial Accuracy
n Single Resistor Programs Output Voltage
n Programmable Current Limit
n Low Dropout Voltage: 235mV
n Output Voltage Range: 0V to –19.5V
n Programmable Power Good and Fast Start-Up
n Bipolar Precision Enable/UVLO Pin
n VIOC Pin Controls Upstream Regulator to Minimize
Power Dissipation and Optimize PSRR
n Minimum Output Capacitor: 10µF Ceramic
n 12-Lead MSOP and 3mm × 3mm DFN Packages
APPLICATIONS
n RF and Precision Power Supplies
n Very Low Noise Instrumentation
n High Speed/High Precision Data Converters
n Medical Applications: Diagnostics and Imaging
n Post-Regulator for Switching Supplies
LT3094
–20V, 500mA, Ultralow
Noise, Ultrahigh PSRR
Negative Linear Regulator
DESCRIPTION
The LT®3094 is a high performance low dropout negative
linear regulator featuring ADI’s ultralow noise and ultrahigh
PSRR architecture for powering noise sensitive applica-
tions. The device can be easily paralleled to further reduce
noise, increase output current and spread heat on a PCB.
The LT3094 supplies 500mA at a typical 235mV dropout
voltage. Operating quiescent current is nominally 2.35mA
and drops to 3µA in shutdown. The device’s wide output
voltage range (0V to –19.5V) error amplifier operates in
unity-gain and provides virtually constant output noise,
PSRR, bandwidth, and load regulation independent of
the programmed output voltage. Additional features are a
bipolar enable pin, programmable current limit, fast start-
up capability and programmable power good to indicate
output voltage regulation. The regulator incorporates a
tracking function to control an upstream supply to maintain
a constant voltage across the LT3094 to minimize power
dissipation and optimize PSRR.
The LT3094 is stable with a minimum 10µF ceramic out-
put capacitor. Built-in protection includes internal current
limit with foldback and thermal limit with hysteresis. The
LT3094 is available in thermally enhanced 12-Lead MSOP
and 3mm × 3mm DFN Packages.
All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION
4.7µF 33.2k
3.3V
200k LT3094 SET
PG
+
7.5k
GND ILIM
PGFB
OUTS
OUT
EN/UV
10µF
100µA
VIN
IN
–5V
PIN NOT USED IN THIS CIRCUIT: VIOC
3094 TA01a
50k
450k
10µF
VOUT
–3.3V
IOUT(MAX)
500mA
Document Feedback
For more information www.analog.com
Power Supply Ripple Rejection
120
105
90
75
60
45
30
VIN = –5V
RSET = 33.2k
15
COUT = 10µF
CSET = 4.7µF
IL = –500mA
0
10 100 1k
10k 100k
FREQUENCY (Hz)
1M 10M
3094 TA01b
Rev. B
1


Analog Devices Semiconductor Electronic Components Datasheet

LT3094EDD Datasheet

Ultrahigh PSRR Negative Linear Regulator

No Preview Available !

LT3094
TABLE OF CONTENTS
Features............................................................................................................................. 1
Applications........................................................................................................................ 1
Typical Application ................................................................................................................ 1
Description......................................................................................................................... 1
Absolute Maximum Ratings...................................................................................................... 3
Pin Configuration.................................................................................................................. 3
Order Information.................................................................................................................. 4
Electrical Characteristics......................................................................................................... 4
Typical Performance Characteristics........................................................................................... 7
Pin Functions......................................................................................................................15
Block Diagram.....................................................................................................................16
Applications Information........................................................................................................17
Typical Applications..............................................................................................................29
Package Description.............................................................................................................31
Revision History..................................................................................................................33
Typical Application...............................................................................................................34
Related Parts......................................................................................................................34
Rev. B
2
For more information www.analog.com


Part Number LT3094EDD
Description Ultrahigh PSRR Negative Linear Regulator
Maker Analog Devices
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