LTC3532_15 Datasheet, PDF (3/16 Pages) Linear Technology – Micropower Synchronous Buck-Boost DC/DC Converter

LTC3532
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_IN = V_OUT = 3.6V, R_T = 64.9k, unless otherwise specified.
PARAMETER
PMOS Switch Leakage
NMOS Switch On Resistance
PMOS Switch On Resistance
Input Current Limit
Maximum Duty Cycle
Minimum Duty Cycle
Frequency Accuracy
Burst Threshold (Falling)
Burst Threshold (Rising)
Burst Current Ratio
Error Amp AVOL
Error Amp Source Current
Error Amp Sink Current
SHDN/SS Threshold
SHDN/SS Input Current
CONDITIONS
Switches A and D
Switches B and C
Switches A and D
Boost (% Switch C On)
Buck (% Switch A On)
Ratio of I_OUT to I_BURST
V_C = 1.4V
V_C = 2V
When IC is Enabled
When EA is at Maximum Boost Duty Cycle
V_SHDN = 5.5V
MIN TYP MAX UNITS
0.1
10
μA
0.36
Ω
0.42
Ω
0.8
1.1
1.45
A
● 70
88
%
● 100
%
●
0
%
● 575
740
885
kHz
0.88
V
1.12
V
8000
90
dB
15
μA
310
μA
● 0.4
1
1.5
V
2.2
V
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: The LTC3532E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlations
with statistical process controls.
Note 3: Current measurements are performed when the outputs are not
switching.
Note 4: 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.
TYPICAL PERFOR A CE CHARACTERISTICS T_A = 25°C, unless otherwise specified.
Efficiency and Power Loss
vs Load Autoburst Mode
100
1000
EFFICIENCY
90
100
80
10
70
POWER LOSS
1
60
50
40 ^{VOUT = 3.3V}
0.1
1
10
100
LOAD CURRENT (mA)
3V ^0.1
3.6V
4.2V
0.01
1000
3532 G01
Efficiency and Power Loss
vs Load
100
1000
90 BURST EFFICIENCY
100
80
70
60 ^BURST
POWER LOSS
10
FIXED FREQUENCY
POWER LOSS
1
50
40
0.1
FIXED FREQUENCY
EFFICIENCY
1
10
100
LOAD CURRENT (mA)
0.1
1000
3532 G02
Fixed Frequency and Burst Mode
Quiescent Current vs V_IN
3.0
80
75
2.5
2000kHz
70
2.0
1500kHz
65
1000kHz
1.5
60
55
1.0
0.5
BURST MODE
0
2.5
3.5
50
500kHz
45
NOT SWITCHING
40
4.5
5.5
V_IN (V)
3532 G03
3532fc
3