SC2738 Datasheet, PDF (12/13 Pages) Semtech Corporation – Ultra Low Output Voltage Dual Linear FET Controller

POWER MANAGEMENT
Typical Characteristics (Cont.)
Output Rise Time At Startup vs. Soft Start
Capacitance vs. Input Voltage
100
V_EN = 5V
T_J = 25°C
V_OUT = 1.05V
C_OUT = 100µF, 25mΩ
10 I_OUT = 0A
MOSFET = IRF7311
1
V_IN = 5V
V_IN = 12V
0.1
0.1
1
10
100
C_DRV (nF)
Load Transient Response, No Passive Droop
SC2738
PRELIMINARY
Load Transient Response, With Passive Droop
V_IN = 5V, 1.2V in to 1.05V out
I_OUT = 0.01A to 2.51A to 0.01A
C_OUT = 2 x 100µF, 25mΩ
Trace 1: V_OUT, 20mV/div., offset 1V
Trace 2: V_DRV, 2V/div.
Trace 3: 1.2V in, 50mV/div., offset 1V
Trace 4: load FET drain
Timebase: 20µs/div.
Load rise/fall times ≥ 35A/µs
V_IN = 5V, 1.2V in to 1.05V out
I_OUT = 0.01A to 2.51A to 0.01A
C_OUT = 1 x 100µF, 25mΩ
R_DROOP = 20mΩ
Trace 1: V_OUT, 20mV/div., offset 1V
Trace 2: not connected
Trace 3: 1.2V in, 50mV/div., offset 1V
Trace 4: load FET drain
Timebase: 20µs/div.
Load rise/fall times ≥ 35A/µs
 2004 Semtech Corp.
12
www.semtech.com