ISL6271A_15 Datasheet, PDF (6/17 Pages) Intersil Corporation – Integrated XScale Regulator

ISL6271A
Typical Operating Performance (Continued)
Test results from the Intersil ISL6271A Customer Reference Board (CRB). Output filter on switcher made up of a 4.7µH drumcore with 100m of
DCR and an output capacitance of 10µF. X5R; Rcomp = 50k, Vin = 3.6V unless otherwise noted.
DATA
VOUT
CLK
I²C Vout = 0.85 to 1.6V 5mV/µs, 40µs/DIV
FIGURE 8. TYPICAL I²C COMMUNICATION
Top: phase node output voltage ripple, 10mV/DIV
Bottom: Inductor current, 100mA/DIV, 1µs/DIV
FIGURE 9. RIPPLE IN DCM
VSRAM, 20mV/DIV
Ripple in DCM: Fripple = 145kHz, Vin = 2.85V, Vout = 0.85V,
Iout = 10mA Ripple = 10mV (worst case), 1µs/DIV
FIGURE 10. PHASE NODE TO DCM
OUTPUT VOLTAGE RIPPLE
LOAD STEP TRIGGER
LDO transient response with 3.3µF output capacitance.
LVCC = 4.1V. 10mA DC load+ 55mA step load.
FIGURE 11. LDO TRANSIENT RESPONSE
EN PIN
VOUT
SOFT PIN
Ripple in CCM Vin = 2.85V, Vo = 0.850V, Fripple = 1MHz,
Io = 500mA, Ripple = 4.2mV, 400ns/DIV
FIGURE 12. RIPPLE IN CCM
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Soft-start into CCM, VIN = 4.2V, CH3 = EN pin. Vout = 0.85
Soft-Start capacitor = 10nF. 200µs/DIV
FIGURE 13. SOFT-START INTO CCM
FN9171.2
August 10, 2015