LTC3736-1 Datasheet, PDF (5/28 Pages) Linear Technology – Dual 2-Phase, No RSENSE Synchronous Controller with Spread Spectrum

LTC3736-1
TYPICAL PERFOR A CE CHARACTERISTICS T_A = 25°C unless otherwise noted.
Maximum Current Sense Voltage
vs I_TH Pin Voltage
100
80
60
40
20
0
–20
0.5
1
1.5
I_TH VOLTAGE (V)
2
37361 G09
Efficiency and Power Lost vs
Load Current
10
100
FIGURE 13 CIRCUIT
V_OUT = 2.5V
95
90
1
85
80
0.1
75
70
0.01
0.001
1
65
V_IN = 5V
V_IN = 3.3V
60
V_IN = 4.2V ₅₅
V_IN = 7.2V ₅₀
10
100
1000 10000
LOAD CURRENT (mA)
37361 G10
Regulated Feedback Voltage
vs Temperature
0.609
0.607
0.605
0.603
0.601
0.599
0.597
0.595
0.593
0.591
–60 –40 –20 0 20 40 60
TEMPERATURE (°C)
80 100
37361 G11
Shutdown (RUN) Threshold
vs Temperature
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
–60 –40 –20 0 20 40 60 80 100
TEMPERATURE (°C)
37361 G12
Maximum Current Sense Threshold
vs Temperature
135 _{IPRG = FLOAT}
130
125
120
115
–60 –40 –20 0 20 40 60
TEMPERATURE (°C)
80 100
37361 G14
Oscillator Frequency
vs Temperature
10
SSDIS = V_IN
8
6
4
2
0
–2
–4
–6
–8
–10
–60 –40 –20 0 20 40 60 80 100
TEMPERATURE (°C)
37361 G15
Efficiency vs Load Current
100
FIGURE 13 CIRCUIT
95 V_OUT = 2.5V
90 ^{VIN = 5V}
85
80
75
70
65
60
55
SPREAD SPECTRUM
50
CONSTANT 550kHz
1
10
100
1000 10000
LOAD CURRENT (mA)
37361 G19
RUN/SS Pull-Up Current
vs Temperature
1.0
0.9
0.8
0.7
0.6
0.5
0.4
–60 –40 –20 0 20 40 60
TEMPERATURE (°C)
80 100
37361 G13
Undervoltage Lockout Threshold
vs Temperature
2.50
2.45
V_IN RISING
2.40
2.35
2.30
V_IN FALLING
2.25
2.20
2.15
2.10
–60 –40 –20 0 20 40 60
TEMPERATURE (°C)
80 100
37361 G16
37361f
5