OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

LTC3539EDCB-2#TRMPBF

P1-P3P4-P6P7-P9P10-P12P13-P14
LTC3539/LTC3539-2
4
35392fc
For more information www.linear.com/3539/3539-2
0.7 1.5 2.31.1 1.9 3.1 5.13.9 4.3 4.72.7 3.5
V
IN
(V)
I
OUT
(mA)
2000
200
1800
1400
1000
600
1600
1200
800
400
0
3539 G05
V
OUT
= 1.8V
V
OUT
= 2.5V
V
OUT
= 3.3V
V
OUT
= 5V
L = 2.2µH
V
IN
(V)
INPUT CURRENT (µA)
200
20
180
140
100
60
160
120
80
40
0
3539 G04
V
OUT
= 1.8V
V
OUT
= 2.5V
V
OUT
= 3.3V
V
OUT
= 5V
0 2 41 3 5
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs Load Current and
V
IN
, V
OUT
= 5V No Load Input Current vs V
IN
Maximum Output Current vs V
IN
0.1
1
10
100
1000
POWER LOSS (mW)
LOAD CURRENT (mA)
EFFICIENCY (%)
100
10
90
70
50
30
80
60
40
20
0
3539 G03
V
IN
= 2.4V
V
IN
= 3.6V
V
IN
= 4.2V
POWER LOSS
EFFICIENCY
0.1 100 1000101
Minimum Load Resistance During
Start-Up vs V
IN
Burst Mode Threshold Current
vs V
IN
; V
OUT
= 1.8V
0.65 0.85 1.050.75 0.95 1.15
V
IN
(V)
LOAD RESISTANCE (Ω)
3539 G06
10000
1000
100
10
0.1
V
OUT
= 3.3V
(T
A
= 25°C unless otherwise noted)
Normalized Current Limit vs V
OUT
V
OUT
(V)
NORMALIZED CURRENT LIMIT (A)
1.10
1.05
0.95
0.85
1.00
0.90
0.80
3539 G08
1.0 1.5 2.52.0 3.5
5.0
4.53.0 4.0
0.7 0.8 0.9 1 1.1 1.2 1.3 1.51.4
V
IN
(V)
LOAD CURRENT (mA)
50
5
45
35
25
15
40
30
20
10
0
3539 G07a
C
OUT
= 44µF
f
SW
= 1MHz
f
SW
= 2MHz
ENTER BURST
LEAVE BURST
0.7 0.9 1.1 1.3 1.5 1.7 1.9 2.1
V
IN
(V)
LOAD CURRENT (mA)
50
5
45
35
25
15
40
30
20
10
0
3539 G07b
C
OUT
= 44µF
f
SW
= 1MHz
f
SW
= 2MHz
ENTER BURST
LEAVE BURST
0.7 0.9 1.1 1.3 1.5 1.7 1.9 2.72.3 2.52.1
V
IN
(V)
LOAD CURRENT (mA)
10
50
30
60
40
20
0
3539 G07c
C
OUT
= 44µF
f
SW
= 1MHz
f
SW
= 2MHz
ENTER BURST
LEAVE BURST
0.7 1.1 1.5 1.9 2.3 2.7 3.1 4.33.93.5
V
IN
(V)
LOAD CURRENT (mA)
100
10
90
70
50
30
80
60
40
20
0
3539 G07d
C
OUT
= 44µF
f
SW
= 1MHz
f
SW
= 2MHz
ENTER BURST
LEAVE BURST
Burst Mode Threshold Current
vs V
IN
; V
OUT
= 2.5V
Burst Mode Threshold Current
vs V
IN
; V
OUT
= 3.3V
Burst Mode Threshold Current
vs V
IN
; V
OUT
= 5V
LTC3539/LTC3539-2
5
35392fc
For more information www.linear.com/3539/3539-2
TEMPERATURE (°C)
V
IN
(V)
0.80
0.75
0.65
0.55
0.70
0.60
0.50
3539 G12
1mA LOAD
NO LOAD
–50 0–25 50 10025 75
TEMPERATURE (°C)
CHANGE IN V
FB
(%)
0.25
–0.25
–0.75
0
–0.50
–1.00
3539 G11
–60 –20–40 40 10080200 60
V
OUT
(V)
R
DS(ON)
(Ω)
0.30
0.25
0.15
0.05
0.20
0.10
0
3539 G09
NMOS
PMOS
1.5 2.52.0 3.5 5.55.04.53.0 4.0
TEMPERATURE (°C)
NORMALIZED R
DS(ON)
(Ω)
1.3
1.2
1.0
0.8
1.1
0.9
0.7
3539 G10
–50 –10–30 30 907010 50
TYPICAL PERFORMANCE CHARACTERISTICS
R
DS(ON)
vs V
OUT
R
DS(ON)
Change vs Temperature V
FB
vs Temperature
Start-Up Voltage vs Temperature Fixed Frequency SW and I
L(AC)
Burst Mode SW and I
L(AC)
Load Step, Fixed Frequency Load Step, Burst Mode Operation
500ns/DIV
V
IN
= 2.4V
V
OUT
= 3.3V AT 400mA
C
OUT
= 22µF
V
OUT
20mV/DIV
AC-COUPLED
INDUCTOR
CURRENT
500mA/DIV
SW PIN
2V/DIV
3539 G13
500µs/DIV
V
IN
= 2.4V
V
OUT
= 3.3V
C
OUT
= 22µF
I
LOAD
= 100mA TO 250mA STEP
V
OUT
50mV/DIV
AC-COUPLED
LOAD
CURRENT
200mA/DIV
3539 G15
5µs/DIV
V
IN
= 3.3V
V
OUT
= 5V
C
OUT
= 22µF
V
OUT
20mV/DIV
AC-COUPLED
INDUCTOR
CURRENT
200mA/DIV
SW PIN
5V/DIV
3539 G14
500µs/DIV
V
IN
= 2.4V
V
OUT
= 3.3V
C
OUT
= 22µF
I
LOAD
= 20mA TO 170mA
V
OUT
50mV/DIV
AC-COUPLED
LOAD
CURRENT
200mA/DIV
3539 G16
LTC3539/LTC3539-2
6
35392fc
For more information www.linear.com/3539/3539-2
BLOCK DIAGRAM
PIN FUNCTIONS
SW (Pin 1): Switch Pin. Connect inductor between SW
and V
IN
. Keep PCB trace lengths as short and wide as pos-
sible to reduce EMI. If the inductor current falls to zero,
or
SHDN is low, an internal anti-ring resistor is connected
from SW to V
IN
to minimize EMI.
PGND (Pin 2), GND (Pin 3): Signal and Power Ground.
Provide a short direct PCB path between PGND, GND and
the (–) side of the input and output capacitors.
V
IN
(Pin 4): Battery Input Voltage. Connect a minimum of
2.2µF ceramic decoupling capacitor from this pin to ground.
SHDN (Pin 5): Logic Controlled Shutdown Input. There
is an internal 4MΩ pull-down on this pin.
SHDN = High: Normal operation.
SHDN = Low: Shutdown, quiescent current <1µA.
FB (Pin 6): Feedback Input to the g
m
Error Amplifier.
Connect resistor divider tap to this pin. The output volt-
age can
be adjusted from 1.5V to 5.25V by: V
OUT
= 1.20V
• [1 + (R2/R1)]
MODE (Pin 7): Burst Mode Pin. A logic controlled input
to select either automatic Burst Mode operation or forced
fixed frequency operation.
MODE = High: Burst Mode operation at light loads
MODE = Low: Fixed frequency PWM Mode
V
OUT
(Pin 8): Output Voltage Sense and Drain of the
Internal Synchronous Rectifier. PCB trace length from
V
OUT
to the output filter capacitor should be as short and
wide as possible.
Exposed Pad (Pin 9): The exposed pad must be soldered
to the PCB ground plane. It serves as another ground
connection, and as a means of conducting heat away
from the die.
–
+
–
+
3539 BD
SW
SHDN
V
OUT
V
OUT
EXPOSED PAD
WAKE
BURST
I
ZERO
SOFT-START
ERROR
AMPLIFIER/SLEEP
COMPARATOR
I
PK
COMPARATOR
I
ZERO
COMPARATOR
SLOPE
COMPARATOR
I
PK
GND
V
IN
V
IN
MODE
FB
FB
R2
+
–
LOGIC AND
BURST MODE
CONTROL
GATE DRIVERS
AND
ANTI-CROSS
CONDUCTION
THERMAL
SHUTDOWN
START-UP
CLAMP
SHUTDOWN SHUTDOWN
V
BEST
V
OUT
V
B
V
SEL
UVLO
UVLO
TSD
V
REF
V
REF
V
REF
Σ
WELL
SWITCH
R1
1MHz/2MHz
OSC
CLK
BURSTPWM
ONOFF
1 4
8
6
3
PGND
29
7
5
P1-P3P4-P6P7-P9P10-P12P13-P14

LTC3539EDCB-2#TRMPBF

Mfr. #:
Buy LTC3539EDCB-2#TRMPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 2A, 2MHz Synchronous Step-Up DC/DC Converter in 2mm x 3mm DFN Package
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet