LTC3736_15 Datasheet, PDF (5/28 Pages) Linear Technology – Dual 2-Phase, No RSENSE, Synchronous Controller with Output Tracking

LTC3736
TYPICAL PERFOR A CE CHARACTERISTICS T_A = 25°C unless otherwise noted.
Maximum Current Sense Voltage
vs I_TH Pin Voltage
100
Burst Mode OPERATION
(I_TH RISING)
80
Burst Mode OPERATION
(I_TH FALLING)
FORCED CONTINUOUS
60
MODE
PULSE SKIPPING
40
MODE
20
0
–20
0.5
1
1.5
I_TH VOLTAGE (V)
2
3736 G09
Efficiency vs Load Current
100
Burst Mode
95
OPERATION
90 ^{(SYNC/FCB = VIN)}
85
80
FORCED
75
CONTINUOUS
(SYNC/FCB = 0V)
70
PULSE SKIPPING
65
MODE
(SYNC/FCB = 550kHz)
60
FIGURE 15 CIRCUIT
55
V_IN = 5V
50
V_OUT = 2.5V
1
10
100
1000 10000
LOAD CURRENT (mA)
3736 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
3736 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)
3736 G12
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
3736 G13
Maximum Current Sense Threshold
vs Temperature
135 _{IPRG = FLOAT}
130
125
120
115
–60 –40 –20 0 20 40 60
TEMPERATURE (°C)
80 100
3736 G14
Oscillator Frequency
vs Temperature
10
8
6
4
2
0
–2
–4
–6
–8
–10
–60 –40 –20 0 20 40 60 80 100
TEMPERATURE (°C)
3736 G15
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
3736 G16
3736fa
5