LTC3526L_15 Datasheet, PDF (4/16 Pages) Linear Technology – 550mA 1MHz Synchronous Step-Up DC/DC Converters

LTC3526L/LTC3526LB
TYPICAL PERFORMANCE CHARACTERISTICS
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)
3526l G07
Burst Mode Threshold Current
vs V_IN (LTC3526L)
40
V_OUT = 3.3V
35 ^COUT ^{= 10µF}
L = 4.7µH
LEAVE BURST
30
25
20
15
ENTER BURST
10
5
0
1.0
1.5
2.0
2.5
3.0
V_IN (V)
3526l 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
3526l G10
Burst Mode Threshold Current
vs V_IN (LTC3526L)
30
V_OUT = 1.8V
C_OUT = 10µF
25 L = 4.7µH
LEAVE BURST
20
ENTER BURST
15
10
5
0
1.0
1.25
V_IN (V)
1.5
3526l G08a
Burst Mode Threshold Current
vs V_IN (LTC3526L)
50
V_OUT = 5V
C_OUT = 10µF
40 ^{L = 4.7µH}
LEAVE BURST
30
20
ENTER BURST
10
0
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
V_IN (V)
3526l 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 70 90
TEMPERATURE (°C)
3526l G11

Burst Mode Threshold Current
vs V_IN (LTC3526L)
30
V_OUT = 2.5V
C_OUT = 10µF
25 L = 4.7µH
LEAVE BURST
20
ENTER BURST
15
10
5
0
1.0
1.25
1.5
1.75
2.0
V_IN (V)
3526l G08b
Oscillator Frequency Change
vs V_OUT
3
NORMALIZED TO V_OUT = 3.3V
2
1
0
–1
–2
–3
1.5 2.0
2.5 3.0 3.5 4.0
V_OUT (V)
4.5 5.0
3526l 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
3526l G12
3526lfc