LTC3531_15 Datasheet, PDF (3/16 Pages) Linear Technology – 200mA Buck-Boost Synchronous DC/DC Converters

LTC3531/
LTC3531-3.3/LTC3531-3
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_IN = 3.6V V_OUT = 3.3V unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
PMOS D R_DSON (3.3V Version or Adjustable Version set to 3.3V)
PMOS D R_DSON (3V Version)
Peak Current Limit
V_OUT = 3.1V
V_OUT = 2.8V
L = 10μH, V_IN = 5V
0.8
Ω
0.9
Ω
295
365
460
mA
SHDN
SHDN Input Threshold
0.4
1
1.4
V
SHDN Hysteresis
60
mV
SHDN Leakage Current
V_SHDN
0.01
1
μA
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 specified maximum operating junction
temperature may result in device degradation or failure.
Note 3: The LTC3531 is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
TYPICAL PERFOR A CE CHARACTERISTICS
Maximum I_OUT vs V_IN
(3.3V Version)
350 _{L = 10μH}
300 ^{VOUT = 3.3V}
250
I_PEAK, I_VALLEY, I_ZERO vs V_IN
450
L = 10μH
400
I_PEAK
350
300
200
250
150
100
50
0
1.5 2 2.5 3 3.5 4 4.5 5 5.5
V_IN (V)
3531 G01
200
I_VALLEY
150
100
50
I_ZERO
0
1.5 2 2.5 3 3.5 4 4.5
V_IN (V)
T_A = 25°C unless otherwise specified.
5 5.5
3531 G02
Sleep Currents
20
18
I_VIN
16
14
12
10
8
6
I_VOUT
4
2
0
1.5 2 2.5 3 3.5 4 4.5
V_IN (V)
5 5.5
3531 G03
I_IN Short Circuit vs V_IN
180
160
140
120
100
80
60
40
20
0
1.5 2 2.5 3 3.5 4 4.5 5 5.5
V_IN (V)
3531 G04
V_OUT Ripple vs C_OUT
(3.3V Version)
100
90
80
10μF
70
60
50
22μF
40
30
20
10
0
1.5 2 2.5
3 3.5 4
V_IN (V)
50mA LOAD
4.5 5 5.5
3531 G05
Load Regulation vs C_OUT
(3.3V Version)
3.40
10μF
3.35
3.30
22μF
3.25
47μF
3.20
V_IN = 3.6V
3.15
0.1
1
10
100
LOAD CURRENT (mA)
1000
3521 G06
3531fb
3