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LTC3406BES5-1.8#TRMPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
4
LTC34 0 6B
3406bfa
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
3406B G07
T
A
= 25°C
INPUT VOLTAGE (V)
10
0.4
0.5
0.7
46
3406B G09
0.3
0.2
23
57
0.1
0
0.6
R
DS(ON)
(Ω)
MAIN
SWITCH
SYNCHRONOUS
SWITCH
T
A
= 25°C
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
Discontinuous Operation
TEMPERATURE (°C)
–50
0.4
0.5
0.7
25 75
3406B 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
TEMPERATURE (°C)
–50
SWITCH LEAKAGE (nA)
200
250
300
25 75
3406B 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
3406B G14
56
100
RUN = 0V
T
A
= 25°C
SYNCHRONOUS
SWITCH
MAIN
SWITCH
LOAD CURRENT (mA)
0
OUTPUT VOLTAGE (V)
500200 300 400 600 800100
1.844
1.834
1.824
1.814
1.804
1.794
1.784
1.774
3406B G08
900700
V
IN
= 3.6V
T
A
= 25°C
SUPPLY VOLTAGE (V)
2
DYNAMIC SUPPLY CURRENT (µA)
6
3406B G11
3
4
5
400
380
360
340
320
300
280
260
240
220
200
V
OUT
= 1.8V
I
LOAD
= 0A
T
A
= 25°C
TEMPERATURE (°C)
–50
340
320
300
280
260
240
220
200
25 75
3406B G12
–25 0
50 100 125
DYNAMIC SUPPLY CURRENT (µA)
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 0A
SW
2V/DIV
V
OUT
10mV/DIV
AC COUPLED
I
L
200mA/DIV
1µs/DIV
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 50mA
3406B G15
5
LTC34 06B
3406bfa
TYPICAL PERFOR A CE CHARACTERISTICS
UW
(From Figure 1a Except for the Resistive Divider Resistor Values)
Start-Up from Shutdown Load Step
Load Step
Load Step
Load Step
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) (LTC3406B): Feedback Pin. Receives the
feedback voltage from an external resistive divider across
the output.
V
OUT
(Pin 5) (LTC3406B-1.5/LTC3406B-1.8): Output Volt-
age Feedback Pin. An internal resistive divider divides the
output voltage down for comparison to the internal refer-
ence voltage.
RUN
5V/DIV
V
OUT
1V/DIV
I
L
500mA/DIV
40µs/DIV
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 600mA (LOAD: 3Ω RESISTOR)
3406B G16
V
OUT
100mV/DIV
AC COUPLED
I
L
500mA/DIV
I
LOAD
500mA/DIV
20µs/DIV
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 0mA TO 600mA
3406B G17
V
OUT
100mV/DIV
AC COUPLED
I
LOAD
500mA/DIV
I
L
500mA/DIV
20µs/DIV
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 50mA TO 600mA
3406B G18
V
OUT
100mV/DIV
AC COUPLED
I
L
500mA/DIV
I
LOAD
500mA/DIV
20µs/DIV
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 100mA TO 600mA
3406B G19
V
OUT
100mV/DIV
AC COUPLED
I
L
500mA/DIV
I
LOAD
500mA/DIV
20µs/DIV
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 200mA TO 600mA
3406B G20
6
LTC34 0 6B
3406bfa
FU CTIO AL DIAGRA
U
U
W
+
–
+
–
EA
+
–
I
RCMP
+
–
I
COMP
5
1
RUN
OSC
SLOPE
COMP
OSC
FREQ
SHIFT
0.6V
FB
0.6V + ∆V
OVL
R1LTC3406B-1.5
R1 + R2 = 550k
LTC3406B-1.8
R1 + R2 = 540k
R2
0.6V REF
SHUTDOWN
V
IN
V
FB
/V
OUT
V
IN
S
R
RS LATCH
OV
SWITCHING
LOGIC
AND
BLANKING
CIRCUIT
ANTI-
SHOOT-
THRU
Q
Q
5Ω
4
SW
3
GND
3406B BD
2
+
–
OVDET
OPERATIO
U
(Refer to Functional Diagram)
Main Control Loop
The LTC3406B 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. The comparator
OVDET guards against transient overshoots >7.8% by
turning the main switch off and keeping it off until the fault
is removed.
Pulse Skipping Mode Operation
At light loads, the inductor current may reach zero or re-
verse on each pulse. The bottom MOSFET is turned off by
the current reversal comparator, I
RCMP
, and the switch
voltage will ring. This is discontinuous mode operation,
and is normal behavior for the switching regulator. At very
light loads, the LTC3406B will automatically skip pulses in
pulse skipping mode operation to maintain output regula-
tion. Refer to LTC3406 data sheet if Burst Mode operation
is preferred.
Short-Circuit Protection
When the output is shorted to ground, the frequency of the
oscillator is reduced to about 210kHz, 1/7 the nominal
frequency. This frequency foldback ensures that the in-
ductor current has more time to decay, thereby preventing
runaway. The oscillator’s frequency will progressively
increase to 1.5MHz when V
FB
or V
OUT
rises above 0V.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC3406BES5-1.8#TRMPBF

Mfr. #:
Buy LTC3406BES5-1.8#TRMPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 600mA, 1.5MHz Sync Step-dwn in ThinSOT w/ burst defeat mode
Lifecycle:
New from this manufacturer.
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