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LTC3448EDD#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
4
LTC34 48
3448f
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Efficiency vs Input Voltage
Efficiency vs Load Current
Reference Voltage
vs Temperature
Oscillator Frequency
vs Temperature
(From Figure1a Except for the Resistive Divider Resistor Values)
Oscillator Frequency
vs Supply Voltage
Output Voltage vs Load Current
R
DS(ON)
vs Input Voltage
INPUT VOLTAGE (V)
2
50
EFFICIENCY (%)
55
65
70
75
100
85
3
4
3448 G01
60
90
95
80
5
6
V
OUT
= 1.8V
T
A
= 25°C
I
OUT
= 30mA
I
OUT
= 600mA
I
OUT
= 100mA
LOAD CURRENT (A)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.0001 0.01 0.1 1
23448 G02
0
0.001
V
OUT
= 1.2V
T
A
= 25°C
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
LOAD CURRENT (A)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.0001 0.01 0.1 1
23448 G03
0
0.001
V
OUT
= 1.5V
T
A
= 25°C
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
Efficiency vs Load Current
Efficiency vs Load Current
(Switcher Only)
LOAD CURRENT (A)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.0001 0.01 0.1 1
23448 G04
0
0.001
V
IN
= 2.7V
V
OUT
= 2.5V
T
A
= 25°C
TEMPERATURE (°C)
–50
REFERENCE VOLTAGE (V)
0.605
0.610
0.615
25 75
3448 G05
0.600
0.595
–25 0
50 100 125
0.590
0.585
V
IN
= 3.6V
TEMPERATURE (°C)
–50
FREQUENCY (MHz)
1.65
25
3448 G06
1.50
1.40
–25 0 50
1.35
1.30
1.70
1.60
1.55
1.45
75 100 125
V
IN
= 3.6V
SUPPLY VOLTAGE (V)
2
1.2
FREQUENCY (MHz)
1.3
1.4
1.5
1.6
1.7
1.8
T
A
= 25°C
34 56
3448 G07
LOAD CURRENT (A)
0.0001
1.475
OUTPUT VOLTAGE (V)
1.480
1.490
1.495
1.500
1.525
1.510
0.001
0.01
3448 G08
1.485
1.515
1.520
1.505
0.1
1
V
IN
= 3.6V
T
A
= 25°C
INPUT VOLTAGE (V)
2
0.20
R
DS(ON)
(Ω)
0.22
0.26
0.28
0.30
0.40
0.34
3
4
3448 G09
0.24
0.36
0.38
0.32
5
6
T
A
= 25°C
MAIN
SWITCH
SYNCHRONOUS
SWITCH
5
LTC34 48
3448f
TYPICAL PERFOR A CE CHARACTERISTICS
UW
(From Figure1a Except for the Resistive Divider Resistor Values)
R
DS(ON)
vs Temperature
Dynamic Supply Current
vs Supply Voltage
Dynamic Supply Current
vs Temperature
Switch Leakage vs Temperature
Switch Leakage vs Input Voltage
Start-Up from Shutdown
Load Step
Load Step
TEMPERATURE (°C)
–50
R
DS(ON)
(Ω)
0.4
0.5
0.6
25 75
3448 G10
0.3
0.2
–25 0
50 100 125
0.1
0
2.5V
3.6V
4.2V
MAIN SWITCH
2.5V
3.6V
4.2V
SYNCH SWITCH
SUPPLY VOLTAGE (V)
2
280
300
340
5
3448 G11
260
240
34
1.5MHz
2.25MHz
6
220
200
320
DYNAMIC SUPPLY CURRENT (µA)
I
LOAD
= 0A
T
A
= 25°C
TEMPERATURE (°C)
–50
DYNAMIC SUPPLY CURRENT (µA)
280
300
320
25 75
3448 G12
260
240
–25 0
50 100 125
220
200
V
IN
= 3.6V
I
LOAD
= 0A
2.25MHz
1.5MHz
TEMPERATURE (°C)
–50
200
250
350
25 75
3448 G13
150
100
–25 0
50 100 125
50
0
300
SWITCH LEAKAGE (nA)
MAIN
SWITCH
V
IN
= 5.5V
RUN = 0V
SYNCHRONOUS
SWITCH
INPUT VOLTAGE (V)
0
0.001
SWITCH LEAKAGE (nA)
0.01
0.1
1
10
1234
3448 G14
56
MAIN
SWITCH
RUN = 0V
T
A
= 25°C
SYNCHRONOUS
SWITCH
RUN
5V/DIV
V
OUT
1V/DIV
I
L
500mA/DIV
V
IN
= 3.6V
V
OUT
= 1.5V
I
LOAD
= 600mA
40µs/DIV
3448 G15
V
OUT
200mV/DIV
AC COUPLED
I
L
500mA/DIV
I
LOAD
100mA/DIV
V
IN
= 3.6V
V
OUT
= 1.5V
I
LOAD
= 100µA TO 200mA
C
OUT
= 10µF
10µs/DIV
3448 G16
V
OUT
100mV/DIV
AC COUPLED
I
L
500mA/DIV
I
LOAD
250mA/DIV
V
IN
= 3.6V
V
OUT
= 1.5V
I
LOAD
= 50mA TO 600mA
C
OUT
= 10µF
10µs/DIV
3448 G17
6
LTC34 48
3448f
TYPICAL PERFOR A CE CHARACTERISTICS
UW
(From Figure 1a Except for the Resistive Divider Resistor Values)
Load Step
External Mode Control (Constant
1mA Load)
UU
U
PI FU CTIO S
V
FB
(Pin 1): Feedback Pin. This pin receives the feedback
voltage from an external resistive divider across the
output.
V
OUT
(Pin 2): Output Pin. This pin connects to an external
resistor divider and the linear regulator output. Connect
externally to the inductor and the output capacitor. The
internal linear regulator will supply current up to the
I
LDO(OFF)
current. Load currents above that are supplied by
the buck regulator. Internal circuitry automatically enables
the buck switching regulator at load currents higher than
the I
LDO(OFF)
. The minimum required capacitance on this
pin is 2µF.
MODE (Pin 3): Linear Regulator Control. Grounding this
pin turns off the linear regulator. Setting this pin to V
IN
turns on the linear regulator regardless of the load current.
Tying this pin midrange (i.e., to V
OUT
) will place the linear
regulator in auto mode, where turn on/off is a function of
the load current. In applications where MODE is externally
driven high or low, this pin should be held low for 50µs
after the RUN pin is pulled high.
V
IN
(Pin 4): Main Supply Pin. This pin must be closely
decoupled to GND with a 2.2µF or greater ceramic
capacitor.
SW (Pin 5): Switch Node Connection to Inductor. This pin
connects to the drains of the internal main and synchro-
nous power MOSFET switches.
FREQ (Pin 6): Frequency Select. Switching frequency is
set to 1.5MHz when FREQ = 0V and to 2.25MHz when
FREQ = V
IN
. Do not float this pin.
SYNC (Pin 7): External Synchronization Pin. The oscilla-
tion frequency can be synchronized to an external oscilla-
tor applied to this pin. For external frequencies above
2.2MHz, pull FREQ high.
RUN (Pin 8): Run Control Input. Forcing this pin above
1.5V enables the part. Forcing this pin below 0.3V shuts
down the device. In shutdown, all functions are disabled
drawing <1µA supply current. Do not leave RUN floating.
Exposed Pad (Pin 9): Ground. This pin must be soldered
to PCB.
V
OUT
100mV/DIV
AC COUPLED
I
L
500mA/DIV
I
LOAD
250mA/DIV
V
IN
= 3.6V
V
OUT
= 1.5V
I
LOAD
= 100mA TO 600mA
10µs/DIV
3448 G18
V
OUT
20mV/DIV
AC COUPLED
MODE PIN
2V/DIV
V
OUT
= 1.5V
T
A
= 25°C
200µs/DIV
3448 G19
SWITCHER SWITCHER
LDO
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LTC3448EDD#TRPBF

Mfr. #:
Buy LTC3448EDD#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 600mA, Synch Step-Down Reg in DFN
Lifecycle:
New from this manufacturer.
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