LTC3122_15 Datasheet, PDF (6/26 Pages) Linear Technology – 15V, 2.5A Synchronous Step-Up DC/DC Converter with Output Disconnect

LTC3122
Typical Performance Characteristics
Efficiency vs Frequency
100
90
80
70
60
50
40
30
20
10
0
10
f_OSC = 200kHz
f_OSC = 1MHz
f_OSC = 3MHz
100
OUTPUT CURRENT (mA)
1000
3122 G19
CAP Pin Voltage vs V_OUT
0
–1
–2
–3
–4
–5
–6
–7
0 2 4 6 8 10 12 14
V_OUT (V)
3122 G20
V_CC vs V_IN
4.5
4.0
3.5
3.0
2.5
0
V_IN FALLING
V_IN RISING
1
2
3
4
V_IN (V)
5
6
3122 G21
Burst Mode Operation
Burst Mode Operation
to PWM Mode
PWM Mode to Burst Mode
Operation
V_OUT
100mV/DIV
AC-COUPLED
V_SW
10V/DIV
INDUCTOR
CURRENT
0.5A/DIV
V_OUT
100mV/DIV
AC-COUPLED
OUTPUT CURRENT = 50mA
5µs/DIV
3122 G22
V_PWM/SYNC
2V/DIV
V_OUT
100mV/DIV
AC-COUPLED
V_PWM/SYNC
2V/DIV
OUTPUT CURRENT = 70mA
20µs/DIV
3122 G23
OUTPUT CURRENT = 70mA
20µs/DIV
3122 G24
Burst Mode Transient
Synchronized Operation
Short-Circuit Response
V_OUT
200mV/DIV
AC-COUPLED
OUTPUT
CURRENT
100mA/DIV
10mA
100mA
10mA
V_SW
5V/DIV
V_PWM/SYNC
5V/DIV
V_OUT
5V/DIV
SYNCHRONIZED TO 1.3MHz
INPUT
CURRENT
2A/DIV
SHORT-CIRCUIT APPLIED
SHORT-CIRCUIT
REMOVED
200µs/DIV
3122 G25
1µs/DIV
3122 G26
100µs/DIV
3122 G27
3122fa
6
For more information www.linear.com/LTC3122