ISL6271A Datasheet, PDF (5/16 Pages) Intersil Corporation – Integrated XScale Regulator

ISL6271A
Typical Operating Performance
Test results from the Intersil ISL6271A Customer Reference Board (CRB). Output filter on switcher made up of a 4.7µH drumcore with 100mΩ of
DCR and an output capacitance of 10µF. X5R; Rcomp = 50kΩ, Vin = 3.6V unless otherwise noted.
100%
95%
90%
85%
80%
75%
70%
65%
Vo=1.6V
Vo=1.3V
60%
0
200
400
600
800
Io (mA)
FIGURE 3. EFFICIENCY (Vin = 3.6V)
1.094
1.093
Io = 10mA
1.092
Io = 25mA
1.091
1.09
1.089
Iout = 55mA
1.088
1.087
1.086
Iout = 85mA
1.085
1.7
2.5
3.5
INPUT VOLTAGE
FIGURE 4. VSRAM LINE-LOAD REGULATION
1.309
1.308
1.307
Io = 5mA
Io = 20mA
1.306
1.305
1.304
1.303
Iout = 55mA
1.302
Iout = 65mA
1.301
1.7
2.5
3.5
INPUT VOLTAGE
FIGURE 5. SWITCHING REGULATOR EFFICIENCY
VOUT
PHASE
IOUT
50mA to 260mA load step on VOUT.
Top: Output voltage, 50mV/DIV; Phase node, 5V/DIV.;
Inductor current, 200mA/DIV, 2µs/DIV
FIGURE 6. DCM TO CCM
5
Top: phase node output voltage ripple, 10mV/DIV.
Bottom: Inductor current, 100mA/DIV, 1µs/DIV
FIGURE 7. CCM TO CCM
FN9171.1