LTC3569_15 Datasheet, PDF (4/26 Pages) Linear Technology – Triple Buck Regulator with 1.2A and Two 600mA Outputs and Individual Programmable References

LTC3569
electrical Characteristics The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T_A = 25°C. V_IN = 3.6V unless otherwise noted (Notes 2, 7).
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
R_PGOOD
UVLO
PGOOD Pull-Down On-Resistance
Undervoltage Lockout
V_FBX < 0.4V
380
525
l
2.5
f_OSC
Fixed Oscillator Frequency
V_RT = SV_IN
l 1.9
2.25
2.8
f_CLK(MAX)
f_CLK(MIN)
f_SYNC
Maximum Programmable Oscillator Frequency
Minimum Programmable Oscillator Frequency
Sync Frequency
R_T = 100k
R_T = 453k
V_RT = SV_IN
R_T = 453k
l 3.0
l
1.0
3
1.2
UNITS
Ω
V
MHz
MHz
MHz
MHz
MHz
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: Current into a pin is positive and current out of a pin is negative.
All voltages referenced to SGND.
Note 3: Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
Note 4: Specification is guaranteed by design and not 100% tested in
production.
Note 5: Switch on-resistance verified by correlation to wafer level
measurements.
Note 6: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature exceeds 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
Note 7: The LTC3569 is tested under pulsed load conditions such that
T_J ≈ T_A. The LTC3569E is guaranteed to meet specified performance from
0°C to 85°C. Specifications over the –40°C to 125°C operating junction
temperature range are assured by design characterization and correlation
with statistical process controls. The LTC3569I is guaranteed to meet
specified performance over the full –40°C to 125°C operating junction
temperature range.
Typical Performance Characteristics T_A = 25°C, unless otherwise noted.
I_SVIN vs Temperature
300
250 _{BUCK1 ONLY PULSE-SKIPPING VIN = 3.5V}
200
SLOPE ≅ 185nA/°C
150
100
BUCK1 ONLY Burst Mode OPERATION
50 ^VIN ^{= 3.5V}
SLOPE ≅ 132nA/°C
0
–50
0
50
NO LOAD
100
150
TEMPERATURE (°C)
3569 G01
Efficiency vs Load Current
OUT2 = 1.8V
100
V_IN = 3V
90
80
70
V_IN = 5V
60
50
40
30
20
10
0
0.01 0.1
Burst Mode OPERATION
PULSE-SKIPPING
1
10
I_LOAD (mA)
100 1000
3569 G02
Efficiency vs Load Current
OUT3 = 1.2V
100
90
V_IN = 3V
80
70
60
V_IN = 5V
50
40
30
20
10
0
0.01 0.1
Burst Mode OPERATION
PULSE-SKIPPING
1
10
I_LOAD (mA)
100 1000
3569 G03
3569fe
4
For more information www.linear.com/LTC3569