Datasheet

LT8619/LT8619-5
6
Rev A
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TYPICAL PERFORMANCE CHARACTERISTICS
V
IN
= 12V
f
OSC
= 700kHz
NO LOAD
FORCED CONTINUOUS MODE
TEMPERATURE (°C)
–50
–25
0
25
50
75
100
125
150
–1.00
–0.75
–0.50
–0.25
0
0.25
0.50
0.75
1.00
∆V
OUT
(%)
OUT
8619 G10
V
IN
= 12V
V
OUT
= 3.3V
f
SW
= 700kHz
FORCED CONTINUOUS MODE
LOAD CURRENT (A)
0
0.2
0.4
0.6
0.8
1.0
1.2
–0.2
–0.1
0
0.1
0.2
∆V
OUT
(%)
Load Regulation
8619 G11
V
OUT
= 2.4V, NO LOAD
f
SW
= 400kHz
FORCED CONTINUOUS MODE
V
IN
(V)
1
10
100
–0.10
–0.05
0
0.05
0.10
∆V
OUT
(%)
8619 G12
SHUTDOWN THRESHOLD
POWER–ON THRESHOLD
EN/UV RISING
EN/UV FALLING
TEMPERATURE (°C)
–50
–25
0
25
50
75
100
125
150
0
0.2
0.4
0.6
0.8
1.0
1.2
V
EN/UV
(V)
EN/UV Threshold
8619 G13
f
SW
= 700kHz
L = 10µH
IHLP-2020BZ-01
DUTY CYCLE (%)
0
20
40
60
80
100
1.5
1.6
1.7
1.8
1.9
2.0
CURRENT LIMIT (A)
8619 G14
V
IN
= 12V
V
OUT
= 3.3V
LOAD CURRENT = 100mA
TOP SWITCH
TEMPERATURE (°C)
–50
–25
0
25
50
75
100
125
150
0
100
200
300
400
500
600
700
800
900
1000
R
DS(ON)
(mΩ)
Switch Resistance
8619 G15
BOTTOM SWITCH
V
OUT
= 3.3V
∆V
OUT
= –1%
f
SW
= 2MHz
L = 3.3µH, IHLP-2020AB-01
FORCED CONTINUOUS MODE
LOAD CURRENT (A)
0
0.2
0.4
0.6
0.8
1.0
1.2
0
0.2
0.4
0.6
0.8
1.0
DROPOUT VOLTAGE (V)
8619 G16
EN/UV Threshold
Top FET Current Limit vs
Duty Cycle
Switch Resistance
Dropout
V
OUT
= 3.3V Load Regulation Line Regulation
V
IN
= 12V
V
OUT
= 3.3V, NO LOAD
FORCED CONTINUOUS MODE
f
SW
= 700kHz
TEMPERATURE (°C)
–50
–25
0
25
50
75
100
125
150
–5
–4
–3
–2
–1
0
1
2
3
4
5
∆f
SW
(%)
SW
8619 G18
f
SW
= 2MHz
Dropout vs Temperature
f
SW
1.2A LOAD
NO LOAD
1.0A LOAD
0.5A LOAD
TEMPERATURE (°C)
–50
–25
0
25
50
75
100
125
150
0
0.25
0.50
0.75
1.00
1.25
1.50
1.75
2.00
DROPOUT VOLTAGE (V)
8619 G17
V
OUT
= 3.3V, ∆V
OUT
= –1%
f
OSC
= 700kHz
FORCED CONTINUOUS MODE
(CONTINUOUS OPERATION
ABOVE MAX JUNCTION
TEMPERATURE MAY
PERMANENTLY
DAMAGE THE
DEVICE)
L = 10µH, IHLP-2020BZ-01
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