LTC3526L-2_15 Datasheet, PDF (4/16 Pages) Linear Technology – 550mA 2MHz Synchronous Step-Up DC/DC Converters

LTC3526L-2/LTC3526LB-2
Typical Performance Characteristics T_A = 25°C, unless otherwise noted.
Start-Up Delay Time vs V_IN
100
90
80
70
60
50
40
30
20
10
0
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
V_IN (V)
3526lb2 G07
Burst Mode Threshold Current
vs V_IN (LTC3526L-2)
60
V_OUT = 3.3V
C_OUT = 10µF
50 L = 2.2µH
40
LEAVE BURST
30
20
ENTER BURST
10
0
1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0
V_IN (V)
3526lb2 G08c
R_DS(ON) vs V_OUT
0.90
0.85
0.80
0.75
0.70
0.65
PMOS
0.60
0.55
0.50
0.45
0.40
NMOS
0.35
0.30
1.5 2.0 2.5 3.0 3.5 4.0
V_OUT (V)
4.5 5.0
3526lb2 G10
Burst Mode Threshold Current
vs V_IN (LTC3526L-2)
35
V_OUT = 1.8V
30
C_OUT = 10µF
L = 2.2µH
LEAVE BURST
25
ENTER BURST
20
15
10
5
0
1.0 1.1 1.2 1.3 1.4 1.5 1.6
V_IN (V)
3526lb2 G08a
Burst Mode Threshold Current
vs V_IN (LTC3526L-2)
70
V_OUT = 5V
60
C_OUT = 10µF
L = 2.2µH
50
LEAVE BURST
40
30
ENTER BURST
20
10
0
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
V_IN (V)
3526lb2 G08d
Oscillator Frequency Change
vs Temperature
10
NORMALIZED TO 25°C
8
6
4
2
0
–2
–4
–6
–8
–10
–50 –30 –10 10 30 50
TEMPERATURE (°C)
70 90
3526lb2 G11

Burst Mode Threshold Current
vs V_IN (LTC3526L-2)
40
V_OUT = 2.5V
35 ^{COUT = 10µF}
L = 2.2µH
LEAVE BURST
30
25
ENTER BURST
20
15
10
5
0
1.0 1.2 1.4 1.6 1.8 2.0 2.2
V_IN (V)
3526lb2 G08b
Oscillator Frequency Change
vs V_OUT
4
NORMALIZED TO V_OUT = 3.3V
3
2
1
0
–1
–2
–3
–4
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
V_OUT (V)
3526lb2 G09
R_DS(ON) Change vs Temperature
1.3
NORMALIZED TO 25°C
1.2
1.1
1.0
0.9
0.8
0.7
–50 –30 –10 10 30 50
TEMPERATURE (°C)
70 90
3526lb2 G12
3526lb2fa