LT3048_15 Datasheet, PDF (1/16 Pages) Linear Technology – Low Noise Bias Generator in 2mm 2mm DFN

LT3048 Series
Low Noise Bias Generator
in 2mm × 2mm DFN
FEATURES
DESCRIPTION
nn _{Generates Low Noise Bias Voltage from Single}
Cell Li-Ion Battery
nn _{Output Current: Up to 40mA}
nn _{Low Output Ripple and Noise: <500µVP-P}
nn _{Boost Regulator}
nn _{1MHz Operation (LT3048)}
nn _{2.2MHz Operation (LT3048-XX)}
nn _{Integrated Schottky Diode}
nn _{Low Dropout Linear Regulator}
nn _{1.235V Feedback Voltage (LT3048)}
nn _{Low Noise: <120µVRMS (10Hz to 100kHz)}
nn _{0.1% Load Regulation}
nn _{Fixed 3.3V, 5V, 12V, 15V and Adjustable Output Options}
nn _{Short-Circuit and Thermal Protection}
nn _{Load Disconnect in Shutdown}
nn _{Available in 2mm × 2mm DFN Package}
APPLICATIONS
nn _{Sensor Bias}
nn _{Op Amp Supply}
The LT^®3048 series generate low noise, low ripple bias
supplies from input voltages of 2.7V to 4.8V.
The LT3048 includes a boost regulator and a LDO linear
regulator. The boost regulator provides power to the
linear regulator.
The boost regulator output voltage is regulated to 1.1V
above the LDO output, optimizing LDO ripple rejection and
transient response. Fixed frequency operation and current
mode control allow the use of very small inductors and
results in low, predictable output ripple.
The linear regulator in the LT3048 generates a program-
mable output and the LT3048-XX generate fixed output
voltages. High power supply ripple rejection combined
with a low noise internal reference results in less than
500µV_P-P output ripple and noise.
The LT3048 is available in a 8-lead 2mm × 2mm DFN
package.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
IN
2.7V TO 4.8V
10µH
SW BSTOUT
V_IN
LDOIN
1µF
LT3048-15
LDOOUT
OFF ON
EN
BYP
GND
3048 TA01a
4.7µF
OUT
15V
1nF
1µF
V_IN (V) I_OUT (mA)
2.7
19
3.3
22
3.6
24
Efficiency
80
70
60
50
40
30
LDOOUT = 15V
L = 10µH
20
DCR = 650mΩ
V_IN = 2.7V
10
V_IN = 3.3V
V_IN = 3.6V
0
0
5
10
15
20
25
LOAD CURRENT (mA)
3048 TA01b
For more information www.linear.com/LT3048
3048fa
1