LTC3536_15 Datasheet, PDF (5/28 Pages) Linear Technology – 1A Low Noise, Buck-Boost DC/DC Converter

LTC3536
Typical Performance Characteristics T_A = 25°C, V_IN = V_OUT = 3.3 V unless otherwise noted.
R_DS(ON) for P-Channel Switch D
280
260
–45°C
0°C
240
25°C
220
85°C
125°C
200
180
160
140
120
100
80
60
1.5 2 2.5 3 3.5 4 4.5 5 5.5 6
INPUT VOLTAGE (V)
3536 G10
Feedback Voltage
1.0
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
– 50 – 30 – 10 10 30 50 70 90 110 130 150
TEMPERATURE (°C)
3536 G11
Oscillator Frequency vs R_T
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
40 90 140 190 240 290 340
R_T (kΩ)
3536 G12
Maximum Load Current in PWM Mode
vs Input Voltage 1MHz Switching
Frequency, 4.7µH Inductor Value
2500
2000
1500
1000
500
V_OUT = 1.8V
V_OUT = 3.3V
V_OUT = 5.5V
0
1.5 2 2.5 3 3.5 4 4.5 5 5.5 6
INPUT VOLTAGE (V)
3536 G13
Maximum Load Current in Burst
Mode Operation vs Input Voltage
300
250
200
150
100
50
V_OUT = 1.8V
V_OUT = 3.3V
V_OUT = 5.5V
0
1.5 2 2.5 3 3.5 4 4.5 5 5.5 6
INPUT VOLTAGE (V)
3536 G14
Negative Inductor Current
vs Oscillator Frequency
0
V_OUT PULLED UP TO 3.6V
V_IN = 1.8V
L = 4.7µH
–0.5
–1.0
–1.5
–2.0
0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4
OSCILLATOR FREQUENCY (MHz)
3536 G15
Change in Output Voltage vs Load
Current for 3.3V Output and 3.3V
Input
1
0
Load Step 0A to 1A
V_OUT
200mV/DIV
Load Step 0mA to 300mA
V_OUT
200mV/DIV
I_LOAD
500mA/DIV
I_LOAD
100mA/DIV
–1
V_IN = 3.2V
V_OUT = 3.3V
100µs/DIV
3536 G17
V_IN = 1.8V
V_OUT = 3.3V
100µs/DIV
3536 G18
–2
–3
0.001
PWM
BURST
0.01
0.1
1
LOAD CURRENT (mA)
10
3536 G16
3536fa
5