参数资料
| 型号： | ISL78211ARZ |
| 厂商： | Intersil |
| 文件页数： | 15/35页 |
| 文件大小： | 0K |
| 描述： | IC REG 1PHASE BUCK 40QFN |
| 标准包装： | 50 |
| 应用： | 转换器，Intel IMVP-6 |
| 输入电压： | 5 V ~ 21 V |
| 输出数： | 1 |
| 输出电压： | 0.3 V ~ 1.5 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-VFQFN 裸露焊盘 |
| 供应商设备封装： | 40-QFN（6x6） |
| 包装： | 管件 |
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ISL78211
High Efficiency Operation Mode
The operational modes of the ISL78211 depend on the control
signal states of DPRSTP#, FDE, and DPRSLPVR, as shown in
Table 2. These control signals can be tied to lntel? IMVP-6?
control signals to maintain the optimal system configuration for
all IMVP-6? conditions.
DPRSTP# = 0, FDE = 0 and DPRSLPVR = 1 enables the ISL78211
to operate in Diode Emulation Mode (DEM) by monitoring the low-
side FET current. In diode emulation mode, when the low-side FET
current flows from source to drain, it turns on as a synchronous
FET to reduce the conduction loss. When the current reverses its
direction, trying to flow from drain to source, the ISL78211 turns
off the low-side FET to prevent the output capacitor from
discharging through the inductor, therefore eliminating the extra
conduction loss. When DEM is enabled, the regulator works in
automatic Discontinuous Conduction Mode (DCM), meaning that
the regulator operates in CCM in heavy load, and operates in DCM
in light load. DCM in light load decreases the switching frequency
to increase efficiency. This mode can be used to support the
deeper sleep mode of the microprocessor.
DPRSTP# = 0 and FDE = 1 enables the Enhanced Diode
Emulation Mode (EDEM), which increases the VW-COMP window
voltage by 33%. This further decreases the switching frequency
at light load to boost efficiency in the deeper sleep mode.
For other combinations of DPRSTP#, FDE, and DPRSLPVR, the
ISL78211 operates in forced CCM.
The ISL78211 operational modes can be set according to CPU
mode signals to achieve the best performance. There are two
options: (1) Tie FDE to DPRSLPVR, and tie DPRSTP# and
DPRSLPVR to the corresponding CPU mode signals. This
configuration enables EDEM in deeper sleep mode to increase
efficiency. (2) Tie FDE to “1” and DPRSTP# to “0” permanently,
and tie DPRSLPVR to the corresponding CPU mode signal. This
configuration sets the regulator in EDEM all the time. The
efficiency is increased in both active mode and deeper sleep
mode.
CPU mode-transition sequences often occur in concert with VID
changes. The ISL78211 employs carefully designed mode-transition
timing to work in concert with the VID changes.
The ISL78211 is equipped with internal counters to prevent
control signal glitches from triggering unintended mode
transitions. For example: Control signals lasting less than seven
switching periods will not enable the diode emulation mode.
Dynamic Operation
The ISL78211 responds to VID changes by slewing to new voltages
with a dv/dt set by the SOFT capacitor and the logic of DPRSLPVR. If
C SOFT = 20nF and DPRSLPVR = 0, the output voltage will move at a
maximum dv/dt of ±10mV/μs for large changes. The maximum
dv/dt can be used to achieve fast recovery from Deeper Sleep to
Active mode. If C SOFT = 20nF and DPRSLPVR = 1, the output voltage
will move at a dv/dt of ±2mV/μs for large changes. The slow dv/dt
into and out of deeper sleep mode will minimize the audible noise.
As the output voltage approaches the VID command value, the
dv/dt moderates to prevent overshoot. The ISL78211 is IMVP-6?
compliant for DPRSTP# and DPRSLPVR logic.
Intersil R 3 ? has an intrinsic voltage feed-forward function. High-
speed input voltage transients have little effect on the output
voltage.
Intersil R 3 ? commands variable switching frequency during
transients to achieve fast response. Upon load application, the
ISL78211 will transiently increase the switching frequency to
deliver energy to the output more quickly. Compared with steady
state operation, the PWM pulses during load application are
generated earlier, which effectively increases the duty cycle and
the response speed of the regulator. Upon load release, the
ISL78211 will transiently decrease the switching frequency to
effectively reduce the duty cycle to achieve fast response.
regulator will enter DCM based on load current. Light-load
TABLE 3. FAULT-PROTECTION SUMMARY OF ISL78211
FAULT DURATION PRIOR TO
FAULT TYPE
Overcurrent fault
Way-Overcurrent fault
Overvoltage fault (1.7V)
PROTECTION
120μs
<2μs
Immediately
PROTECTION ACTIONS
PWM tri-state, PGOOD latched low
PWM tri-state, PGOOD latched low
Low-side FET on until Vcore < 0.85V, then
FAULT RESET
VR_ON toggle or VDD toggle
VR_ON toggle or VDD toggle
VDD toggle
PWM tri-state, PGOOD latched low (OV to 1.7V
always)
Overvoltage fault (+200mV)
Undervoltage fault (-300mV)
Over-temperature fault (NTC<1.18)
15
1ms
1ms
Immediately
PWM tri-state, PGOOD latched low
PWM tri-state, PGOOD latched low
VR_TT# goes high
VR_ON toggle or VDD toggle
VR_ON toggle or VDD toggle
N/A
FN7578.1
December 4, 2013
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