LTC3815_15 Datasheet, PDF (6/42 Pages) Linear Technology – 6A Monolithic Synchronous DC/DC Step-Down Converter with Digital Power System Management

LTC3815
Typical Performance Characteristics
Efficiency vs Load Current
100
V_IN = 3.3V, V_OUT = 1.8V
90 f_SW = 1MHz
80
70
60
50
40
30
20
10
0
0.01
CCM Mode
DCM Mode
0.1
1
LOAD CURRENT (A)
10
3815 G01
Efficiency vs Input Voltage
100
V_OUT = 1.0V
CCM Mode
90
80
Load Step
(Forced Continuous Mode)
V_OUT
50mV/DIV
70
I_LOAD
5A/DIV
LOAD = 1A, f = 1MHz
60
LOAD = 6A, f = 1MHz
LOAD = 1A, f = 2MHz
LOAD = 6A, f = 2MHz
50
2
3
4
5
6
INPUT VOLTAGE (V)
3815 G02
10µs/DIV
V_OUT = 1V
I_LOAD = 0A TO 5A
CCM MODE
FRONT PAGE CIRCUIT
3815 G03
Load Step
(Discontinuous Mode)
V_OUT
50mV/DIV
I_LOAD
5A/DIV
10µs/DIV
V_OUT = 1V
I_LOAD = 0A TO 5A
DCM MODE
FRONT PAGE CIRCUIT
Output Margining
MARGIN
2V/DIV
V_OUT
200mV/DIV
3815 G04
CSLEW
1V/DIV
1ms/DIV
MARGIN REGISTERS PRE-LOADED
TO 10% AND –10%
C_SLEW = 10pF
3815 G05
Load Regulation
0.20
0.10
V_IN = 3.3V
0
–0.10
–0.20
–6
–4 –2 0
2
LOAD CURRENT (A)
4
6
3815 G06
Line Regulation
0.20
Discontinuous Mode Operation
Forced Continuous Mode
Operation
0.10
0
–0.10
–0.20
2
V_OUT
20mV/DIV
I_L
1A/DIV
I_OUT = 6A
CCM MODE
FRONT PAGE CIRCUIT
3
4
5
INPUT VOLTAGE (V)
6
3815 G07
5µs/DIV
V_OUT = 1.8V
I_LOAD = 100mA
V_MODE = 3.3V
FRONT PAGE CIRCUIT
V_OUT
20mV/DIV
I_L
1A/DIV
3815 G08
1µs/DIV
V_OUT = 1.8V
I_LOAD = 100mA
V_MODE = 0V
FRONT PAGE CIRCUIT
6
For more information www.linear.com/LTC3815
3815 G09
3815p