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LTC3406ES5#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
4
LTC34 06
LTC34 06 -1.5/LTC34 06 -1.8
3406fa
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Oscillator Frequency vs
Supply Voltage
Output Voltage vs Load Current
R
DS(ON
) vs Input Voltage
(From Figure1a Except for the Resistive Divider Resistor Values)
SUPPLY VOLTAGE (V)
2
OSCILLATOR FREQUENCY (MHz)
1.8
1.7
1.6
1.5
1.4
1.3
1.2
34 56
3406 G07
LOAD CURRENT (mA)
0
OUTPUT VOLTAGE (V)
200 300 400 500 600 700 800
1.844
1.834
1.824
1.814
1.804
1.794
1.784
1.774
3406 G08
100 900
V
IN
= 3.6V
INPUT VOLTAGE (V)
10
0.4
0.5
0.7
46
3406 G09
0.3
0.2
23
57
0.1
0
0.6
R
DS(ON)
(Ω)
MAIN
SWITCH
SYNCHRONOUS
SWITCH
R
DS(ON)
vs Temperature Supply Current vs Supply Voltage Supply Current vs Temperature
Switch Leakage vs Temperature
Switch Leakage vs Input Voltage
Burst Mode Operation
TEMPERATURE (°C)
–50
0.4
0.5
0.7
25 75
3406 G10
0.3
0.2
–25 0
50 100 125
0.1
0
0.6
R
DS(ON)
(Ω)
MAIN SWITCH
SYNCHRONOUS SWITCH
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
SUPPLY VOLTAGE (V)
2
0
SUPPLY CURRENT (µA)
5
15
20
25
50
35
3
4
3406 G11
10
40
45
30
5
6
V
OUT
= 1.8V
I
LOAD
= 0A
TEMPERATURE (°C)
–50
0
SUPPLY CURRENT (µA)
5
15
20
25
50
35
0
50
75
3406 G12
10
40
45
30
–25
25
100
125
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 0A
TEMPERATURE (°C)
–50
SWITCH LEAKAGE (nA)
200
250
300
25 75
3406 G13
150
100
–25 0
50 100 125
50
0
V
IN
= 5.5V
RUN = 0V
MAIN SWITCH
SYNCHRONOUS SWITCH
INPUT VOLTAGE (V)
0
0
SWITCH LEAKAGE (pA)
20
40
60
80
120
1
234
3406 G14
56
100
RUN = 0V
SYNCHRONOUS
SWITCH
MAIN
SWITCH
SW
5V/DIV
I
L
200mA/DIV
V
OUT
100mV/DIV
AC COUPLED
4µs/DIVV
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 50mA
3406 G15
5
LTC34 06
LTC34 0 6 -1.5/LTC34 0 6 -1.8
3406fa
TYPICAL PERFOR A CE CHARACTERISTICS
UW
(From Figure 1a Except for the Resistive Divider Resistor Values)
Start-Up from Shutdown
Load Step
Load Step
RUN
2V/DIV
I
LOAD
500mA/DIV
V
OUT
2V/DIV
40µs/DIVV
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 600mA
3406 G16
I
L
500mA/DIV
I
LOAD
500mA/DIV
V
OUT
100mV/DIV
AC COUPLED
20µs/DIVV
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 0mA TO 600mA
3406 G17
I
LOAD
500mA/DIV
I
L
500mA/DIV
V
OUT
100mV/DIV
AC COUPLED
20µs/DIVV
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 50mA TO 600mA
3406 G18
Load Step
Load Step
I
LOAD
500mA/DIV
I
L
500mA/DIV
V
OUT
100mV/DIV
AC COUPLED
20µs/DIVV
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 100mA TO 600mA
3406 G19
I
L
500mA/DIV
I
LOAD
500mA/DIV
V
OUT
100mV/DIV
AC COUPLED
20µs/DIVV
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 200mA TO 600mA
3406 G20
UU
U
PI FU CTIO S
RUN (Pin 1): 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.
GND (Pin 2): Ground Pin.
SW (Pin 3): Switch Node Connection to Inductor. This pin
connects to the drains of the internal main and synchro-
nous power MOSFET switches.
V
IN
(Pin 4): Main Supply Pin. Must be closely decoupled
to GND, Pin 2, with a 2.2µF or greater ceramic capacitor.
V
FB
(Pin 5) (LTC3406): Feedback Pin. Receives the feed-
back voltage from an external resistive divider across the
output.
V
OUT
(Pin 5) (LTC3406-1.5/LTC3406-1.8): Output Volt-
age Feedback Pin. An internal resistive divider divides the
output voltage down for comparison to the internal refer-
ence voltage.
6
LTC34 06
LTC34 06 -1.5/LTC34 06 -1.8
3406fa
FU CTIO AL DIAGRA
U
U
W
+
–
+
–
+
–
EA
+
–
I
RCMP
+
–
I
COMP
5
1
RUN
OSC
SLOPE
COMP
OSC
FREQ
SHIFT
0.6V
FB
R1LTC3406-1.5
R1 + R2 = 550k
LTC3406-1.8
R1 + R2 = 540k
R2
0.6V REF
SHUTDOWN
0.4V
0.65V
SLEEP
V
IN
V
FB
/V
OUT
BURST
V
IN
S
R
RS LATCH
SWITCHING
LOGIC
AND
BLANKING
CIRCUIT
ANTI-
SHOOT-
THRU
Q
Q
5Ω
4
SW
3
GND
3406 BD
2
OPERATIO
U
(Refer to Functional Diagram)
Main Control Loop
The LTC3406 uses a constant frequency, current mode
step-down architecture. Both the main (P-channel
MOSFET) and synchronous (N-channel MOSFET) switches
are internal. During normal operation, the internal top
power MOSFET is turned on each cycle when the oscillator
sets the RS latch, and turned off when the current com-
parator, I
COMP
, resets the RS latch. The peak inductor
current at which I
COMP
resets the RS latch, is controlled by
the output of error amplifier EA. When the load current
increases, it causes a slight decrease in the feedback
voltage, FB, relative to the 0.6V reference, which in turn,
causes the EA amplifier’s output voltage to increase until
the average inductor current matches the new load cur-
rent. While the top MOSFET is off, the bottom MOSFET is
turned on until either the inductor current starts to reverse,
as indicated by the current reversal comparator I
RCMP
, or
the beginning of the next clock cycle.
Burst Mode Operation
The LTC3406 is capable of Burst Mode operation in which
the internal power MOSFETs operate intermittently based
on load demand.
In Burst Mode operation, the peak current of the inductor
is set to approximately 200mA regardless of the output
load. Each burst event can last from a few cycles at light
loads to almost continuously cycling with short sleep
intervals at moderate loads. In between these burst events,
the power MOSFETs and any unneeded circuitry are turned
off, reducing the quiescent current to 20µA. In this sleep
state, the load current is being supplied solely from the
output capacitor. As the output voltage droops, the EA
amplifier’s output rises above the sleep threshold signal-
ing the BURST comparator to trip and turn the top MOSFET
on. This process repeats at a rate that is dependent on the
load demand.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC3406ES5#TRPBF

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Buy LTC3406ES5#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 600mA, 1.5MHz Sync Step-dwn in ThinSOT
Lifecycle:
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