LTC3601_15 Datasheet, PDF (4/26 Pages) Linear Technology – 1.5A, 15V Monolithic Synchronous Step-Down Regulator

LTC3601
ELECTRICAL CHARACTERISTICS
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 LTC3601 is tested under pulsed load conditions such that
T_J ≈ T_A. The LTC3601E is guaranteed to meet specifications from
0°C to 85°C junction temperature. Specifications over the –40°C to
125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTC3601I is guaranteed over the full –40°C to 125°C operating junction
temperature range. Note that the maximum ambient temperature
consistent with these specifications is determined by specific operating
conditions in conjunction with board layout, the rated package thermal
impedance and other environmental factors.
Note 3: T_J is calculated from the ambient temperature, T_A, and power
dissipation, P_D, according to the following formula:
T_J = T_A + (P_D • θ_JA)
where θ_JA = 45°C/W for the QFN package and θ_JA = 38°C/W for the MSOP
package.
Note 4: Maximum allowed current draw when used as a regulated output
is 5mA. This supply is only intended to provide additional DC load current
as needed and not intended to regulate large transient or ac behavior as
these waveforms may impact LTC3601 operation.
TYPICAL PERFORMANCE CHARACTERISTICS
T_A = 25°C, V_IN = 12V, f_O = 1MHz, L = 2.2μH unless otherwise noted.
Efficiency vs Load Current
Burst Mode Operation
100
V_OUT = 1.8V
90
80
70
60
50
40
30
20
10
0
0.001
V_IN = 4V
V_IN = 8V
V_IN = 12V
0.01
0.1
1
10
LOAD CURRENT (A)
3601 G01
Efficiency vs Input Voltage
Burst Mode Operation
100
95
I_LOAD = 100mA
90
I_LOAD = 500mA
85
I_LOAD = 1.5A
80
I_LOAD = 10mA
75
70
65 _{VOUT = 1.8V}
FIGURE 7 CIRCUIT
60
4
6
8 10 12
INPUT VOLTAGE (V)
14 16
3601 G04
4
Efficiency vs Load Current
Forced Continuous Mode
100
V_OUT = 1.8V
90
80
70
60
50
40
30
20
10
0
0.001
V_IN = 4V
V_IN = 8V
V_IN = 12V
0.01
0.1
1
10
LOAD CURRENT (A)
3601 G02
Efficiency vs Frequency
Forced Continuous Mode
92
V_OUT =1.8V
I_LOAD = 500mA
90
88
L = 2.2μH
86
L = 1μH
84
82
80
0.5
1.0
1.5
2.0
2.5
3.0
FREQUENCY (MHz)
3601 G05
Efficiency vs Load Current
100
90
BURST
80
70
FORCED
60
CONTINUOUS
50
40
30
20
10
0
0.001
V_OUT = 3.3V
V_OUT = 5V
0.01
0.1
1
10
LOAD CURRENT (A)
3601 G03
Reference Voltage vs
Temperature
0.605
0.603
0.601
0.599
0.597
0.595
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3601 G06
3601fb