Datasheet

LTC3531/
LTC3531-3.3/LTC3531-3
3
3531fa
TYPICAL PERFOR
UW
CE CHARACTERISTICSA
T
A
= 25°C unless otherwise specifi ed.
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specifi ed maximum operating junction
temperature may result in device degradation or failure.
Note 3: The LTC3531 is guaranteed to meet performance specifi cations
from 0°C to 70°C. Specifi cations over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
ELECTRICAL CHARACTERISTICS
The ● denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 3.6V V
OUT
= 3.3V unless otherwise noted.
V
IN
(V)
1.5
MAXIMUM I
OUT
(mA)
200
250
300
4.5 543
3531 G01
150
100
2.52 3.5 5.5
50
0
350
V
IN
(V)
1.5
CURRENT (mA)
200
250
300
5.55
3531 G02
150
100
0
2.52
3.53
4.54
50
400
450
350
I
PEAK
I
VALLEY
I
ZERO
V
IN
(V)
1.5
0
CURRENT (µA)
2
6
8
10
20
14
2.5
3.5
4
3531 G03
4
16
18
12
23
4.5
5
5.5
I
VIN
I
VOUT
V
IN
(V)
1.5 2
I
IN
(mA)
80
100
120
5.5
3531 G04
60
40
0
2.5 3
3.5 4
4.5 5
20
160
180
140
V
IN
(V)
1.5
0
V
RIPPLE PEAK-PEAK
(mV)
10
30
40
50
100
70
2.5
3.5
4
3531 G05
20
80
90
60
23
4.5
5
5.5
10µF
22µF
LOAD CURRENT (mA)
0.1
V
OUT
(V)
3.25
3.30
1000
3521 G06
3.20
3.15
1
10
100
3.40
3.35
47µF
10µF
22µF
L = 10µH
V
OUT
= 3.3V
L = 10µH
50mA LOAD
V
IN
= 3.6V
I
IN
Short Circuit vs V
IN
V
OUT
Ripple vs C
OUT
(3.3V Version)
Load Regulation vs C
OUT
(3.3V Version)
Maximum I
OUT
vs V
IN
(3.3V Version)
I
PEAK
, I
VALLEY
, I
ZERO
vs V
IN
Sleep Currents
SHDN
PARAMETER CONDITIONS MIN TYP MAX UNITS
PMOS D R
DSON
(3.3V Version or Adjustable Version set to 3.3V) V
OUT
= 3.1V 0.8 Ω
PMOS D R
DSON
(3V Version) V
OUT
= 2.8V 0.9 Ω
Peak Current Limit L = 10μH, V
IN
= 5V 295 365 460 mA
SHDN
Input Threshold 0.4 1 1.4 V
SHDN
Hysteresis 60 mV
SHDN
Leakage Current V
SHDN
0.01 1 µA