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LT3048IDC-3.3#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LT3048 Series
7
3048fa
For more information www.linear.com/LT3048
LT3048-3.3 LDOOUT Voltage LT3048-3.3 LDOOUT Noise LDOOUT Current Limit
Boost Switch Current Limit Boost Switch Current Limit LT3048-XX Switching Frequency
LT3048-5 LDOOUT Noise LT3048-3.3 Efficiency
LT3048-3.3 LDOOUT
Load Regulation
TYPICAL PERFORMANCE CHARACTERISTICS
TEMPERATURE (°C)
–50
0
CURRENT LIMIT (mA)
10
30
40
50
50
90
3048 G24
20
0
–25
75 100
25 125
60
70
80
DUTY CYCLE (%)
0
SWITCH CURRENT LIMIT (mA)
300
400
500
80
3048 G25
200
100
250
350
450
150
50
0
20
40
60
100
TEMPERATURE (°C)
–50
0
SWITCH CURRENT LIMIT (mA)
50
150
200
250
500
350
0
50
75
3048 G26
100
400
450
300
–25 25
100
125
150
TEMPERATURE (°C)
–50
FREQUENCY (MHz)
1.5
2.0
2.5
25 75 150
1.0
0.5
0
–25 0
50
100 125
FREQUENCY (Hz)
NOISE SPECTRAL DENSITY (nV/√Hz)
3048 G19
10000
1000
100
10
1
0.1
10 100 100k 1M10k1k
V
IN
= 3.6V
V
OUT
= 5V
L = 4.7μH
C
BSTOUT
= 2.2μF
C
LDOOUT
= 1μF
C
BYP
= 1nF
I
LOAD
= 40mA
LOAD CURRENT (mA)
0
EFFICIENCY (%)
30
40
50
15
40353025
3048 G20
20
10
0
5 10 20
60
V
IN
= 2.7V
V
IN
= 3.3V
V
IN
= 3.6V
V
OUT
= 3.3V
L = 3.3µH
DCR = 285mΩ
LOAD CURRENT (mA)
0
LDOOUT VOLTAGE (V)
3.38
3.36
3.34
3.32
3.28
3.26
3.24
3.30
3.22
2010 30
3048 G21
4015 355 25
TEMPERATURE (°C)
–50
LDOOUT VOLTAGE (V)
3.38
3.36
3.32
3.28
3.24
3.34
3.30
3.26
3.22
25–25 75 100
3048 G22
1250 50
V
IN
= 3.6V
V
OUT
= 3.3V
L = 3.3μH
C
BSTOUT
= 2.2μF
C
LDOOUT
= 1μF
C
BYP
= 1nF
I
LOAD
= 40mA
FREQUENCY (Hz)
NOISE SPECTRAL DENSITY (nV/√Hz)
3048 G23
10000
1000
100
10
1
10 100 100k 1M10k1k
0.1
LT3048 Series
8
3048fa
For more information www.linear.com/LT3048
PIN FUNCTIONS
LT3048
SW (Pin 1): Boost Regulator Switch Node. This is the
collector of the internal power transistor and the anode
of the internal Schottky diode.
V
IN
(Pin 2): Input Supply. Provides operating current to
the boost regulator. Bypass to ground.
GND (Pin 3): Ground. This pin must be soldered to PCB
ground. The exposed pad must also be soldered to PCB
ground.
BYP (Pin 4): Bypass. Add an optional capacitor from
LDOOUT to BYP to reduce noise at LDOOUT; otherwise
leave BYP unconnected. A capacitor also soft-starts the
linear regulator.
FB (Pin 5): The LT3048 regulates the FB pin to 1.25V.
Connect the feedback resistor divider tap to this pin.
LDOOUT (Pin 6): LDO Linear Regulator Output. This pin
is programmed by the feedback resistor divider. Bypass
to ground with a minimum of 1μF.
EN (Pin 7): Enable. Logic input to enable the boost and
linear regulator.
BSTOUT (Pin 8): Boost Regulator Output. This pin is con-
nected to the internal Schottky diode and is regulated to
1.1V above LDOOUT. Bypass to ground.
GND (Exposed Pad Pin 9): The internal boost power switch
is connected to the exposed pad. Tie to ground.
LT3048-XX
SW (Pin 1): Boost Regulator Switch
Node. This is the
collector of the internal power transistor and the anode
of the internal Schottky diode.
V
IN
(Pin 2): Input Supply. Provides operating current to
the boost regulator. Bypass to ground.
GND (Pin 3): Ground. This pin must be soldered to PCB
ground. The exposed pad must also be soldered to PCB
ground.
BYP (Pin 4): Bypass. Add an optional capacitor from
LDOOUT to BYP to reduce noise at LDOOUT; otherwise
leave BYP unconnected. A capacitor also soft-starts the
linear regulator.
LDOOUT (Pin 5): LDO Linear Regulator Output. This pin
is regulated to a fixed voltage. Bypass to ground with a
minimum of 1μF.
LDOIN (Pin 6): LDO Linear Regulator Input. Normally
connected to BSTOUT. Bypass to ground.
EN (Pin 7): Enable. Logic input to enable the boost and
linear regulator.
BSTOUT (Pin 8): Boost Regulator Output. This pin is con-
nected to the internal Schottky diode and is regulated to
1.1V above LDOOUT. Bypass to ground.
GND (Exposed Pad Pin 9): The internal boost power switch
is connected to the exposed pad. Tie to ground.
LT3048 Series
9
3048fa
For more information www.linear.com/LT3048
LT3048 BLOCK DIAGRAMS
Figure 1a. LT3048 Block Diagram
–
++
8
6
1
+
+
A1
V
C
GND
3, 9
3048 F01a
Q1
Q2
SW
2
V
IN
IN
BSTOUT
C2
C4 C3
L1
LDOOUT
OUT
4
5
BYP
FB
1.1V
OSC
C1
7
EN
ON OFF
R1
R2
1.235V
Figure 1b. LT3048-XX Block Diagram
–
++
8 6
5
1
+
+
A1
V
C
GND
3, 9
3048 F01b
Q1
Q2
SW
2
V
IN
IN
BSTOUT LDOIN
C2
C4 C3
L1
LDOOUT
OUT
4
BYP
1.1V
OSC
C1
7
EN
ON OFF
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LT3048IDC-3.3#TRPBF

Mfr. #:
Buy LT3048IDC-3.3#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Low Noise Bias Generator in 2mm 2mm DFN
Lifecycle:
New from this manufacturer.
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