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ISL8012 pdf datasheet (High Ef
消耗积分:3 |
格式:rar |
大小:433 |
2009-01-19
王艳
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The ISL8012 is a high efficiency, monolithic, synchronous
step-down DC/DC converter that can deliver up to 2A
continuous output current from a 2.7V to 5.5V input supply. It
uses a current control architecture to deliver very low duty
cycle operation at high frequency with fast transient
response and excellent loop stability.
The ISL8012 integrates a pair of low ON-resistance
P-Channel and N-Channel internal MOSFETs to maximize
efficiency and minimize external component count. The
100% duty-cycle operation allows less than 240mV dropout
voltage at 2A output current. High 1MHz pulse-width
modulation (PWM) switching frequency allows the use of
small external components.
The ISL8012 can be configured for discontinuous or forced
continuous operation at light load. Forced continuous
operation reduces noise and RF interference while
discontinuous mode provides high efficiency by reducing
switching losses at light loads.
Fault protection is provided by internal current limiting during
short circuit and overcurrent conditions, an output over
voltage comparator and over-temperature monitor circuit. A
power good output voltage monitor indicates when the
output is in regulation.
The ISL8012 offers a 1ms Power Good (PG) timer at
power-up. When shutdown, ISL8012 discharges the output
capacitor. Other features include internal soft-start, internal
compensation, overcurrent protection, and thermal
shutdown.
The ISL8012 is offered in a space saving 3mmx3mm 10 Ld
DFN package lead free package with exposed pad lead
frames for low thermal. The complete converter occupies
less than 0.35in2 area.
step-down DC/DC converter that can deliver up to 2A
continuous output current from a 2.7V to 5.5V input supply. It
uses a current control architecture to deliver very low duty
cycle operation at high frequency with fast transient
response and excellent loop stability.
The ISL8012 integrates a pair of low ON-resistance
P-Channel and N-Channel internal MOSFETs to maximize
efficiency and minimize external component count. The
100% duty-cycle operation allows less than 240mV dropout
voltage at 2A output current. High 1MHz pulse-width
modulation (PWM) switching frequency allows the use of
small external components.
The ISL8012 can be configured for discontinuous or forced
continuous operation at light load. Forced continuous
operation reduces noise and RF interference while
discontinuous mode provides high efficiency by reducing
switching losses at light loads.
Fault protection is provided by internal current limiting during
short circuit and overcurrent conditions, an output over
voltage comparator and over-temperature monitor circuit. A
power good output voltage monitor indicates when the
output is in regulation.
The ISL8012 offers a 1ms Power Good (PG) timer at
power-up. When shutdown, ISL8012 discharges the output
capacitor. Other features include internal soft-start, internal
compensation, overcurrent protection, and thermal
shutdown.
The ISL8012 is offered in a space saving 3mmx3mm 10 Ld
DFN package lead free package with exposed pad lead
frames for low thermal. The complete converter occupies
less than 0.35in2 area.
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