參數(shù)資料
型號(hào)： ISL6426IV-T
廠商： INTERSIL CORP
元件分類： 穩(wěn)壓器
英文描述： Single Synchronous Buck Pulse-Width Modulation (PWM) Controller
中文描述： SWITCHING CONTROLLER, 770 kHz SWITCHING FREQ-MAX, PDSO16
封裝： PLASTIC, MO-153-AB, TSSOP-16
文件頁(yè)數(shù)： 7/18頁(yè)
文件大?。?/td> 541K
代理商： ISL6426IV-T
7
Pin Descriptions
CPVOUT -
This pin represents the output of the charge
pump. The voltage at this pin is the bias voltage for the IC.
Connect a decoupling capacitor from this pin to ground. The
value of the decoupling capacitor should be at least 10x the
value of the charge pump capacitor. This pin may be tied to
the bootstrap circuit as the source for creating the BOOT
voltage.
CT1 and CT2 -
These pins are the connections for the
external charge pump capacitor. A minimum of a 0.1
μ
F
ceramic capacitor is recommended for proper operation of
the IC.
OCSET -
Connect a resistor (R
OCSET
) from this pin to the
drain of the upper MOSFET (V
IN
). R
OCSET
, an internal 20
μ
A
current source (I
OCSET
), and the upper MOSFET on-
resistance (r
DS(ON)
) set the converter overcurrent (OC) trip
point according to the following equation:
An overcurrent trip cycles the soft-start function.
VOUT -
This pin provides the external switcher output
voltage to the IC as feedback for the 1.8V fixed output
voltage option. Tie this pin to 1.8V for the ISL6426 fixed 1.8V
option. Leave this pin open on the ISL6406 for the adjustable
output voltage option.
VCC -
This pin provides bias supply for the ISL6406,
ISL6426. Connect a well-coupled 3.3V supply to this pin.
PHASE -
Connect this pin to the upper MOSFET’s source.
This pin is used to monitor the voltage drop across the upper
MOSFET for overcurrent protection.
RT -
Connect an external resistor from this pin to ground for
frequency selection. Refer to RT vs Frequency curve of
Figure 3.
BOOT -
This pin provides ground referenced bias voltage to
the upper MOSFET driver. A bootstrap circuit is used to
create a voltage suitable to drive a logic-level N-Channel
MOSFET. A large (~1MOhm) resistor should be connected
from this pin to GND. The purpose of this resistor is to
discharge the BOOT pin during a shutdown condition,
SYNC/EN = LOW so that the gate drivers are quickly
powered off by this bleed resistor.
UGATE -
Connect this pin to the upper MOSFET’s gate. This
pin provides the PWM-controlled gate drive for the upper
MOSFET. This pin is also monitored by the adaptive shoot-
through protection circuitry to determine when the upper
MOSFET has turned off.
GND -
This pin represents the signal and power ground for
the IC. Tie this pin to the ground island/plane through the
lowest impedance connection available.
LGATE -
Connect this pin to the lower MOSFET’s gate. This
pin provides the PWM-controlled gate drive for the lower
MOSFET. This pin is also monitored by the adaptive shoot-
through protection circuitry to determine when the lower
MOSFET has turned off.
COMP and FB -
COMP and FB are the available external
pins of the error amplifier. The FB pin is the inverting input of
the internal error amplifier and the COMP pin is the error
amplifier output. These pins are used to compensate the
control feedback loop of the converter.
CPGND -
This pin represents the signal and power ground
for the charge pump. Tie this pin to the ground island/plane
through the lowest impedance connection available.
SYNC/EN -
This is a dual-function pin. To synchronize with
an external clock, apply a clock with a frequency 1.1 to 2.0
times higher than the part’s natural frequency to this pin. The
device may be disabled by tying this pin to ground. In this
shutdown mode, all functions are disabled and the device
will draw <50
μ
A supply current.
I
PEAK
I
---------------r
(
)
R
DS ON
(
)
)
=
ISL6406, ISL6426
相關(guān)PDF資料
PDF描述
ISL6406IVZ Single Synchronous Buck Pulse-Width Modulation (PWM) Controller
ISL6426IVZ Single Synchronous Buck Pulse-Width Modulation (PWM) Controller
ISL6406IVZ-T Single Synchronous Buck Pulse-Width Modulation (PWM) Controller
ISL6426IVZ-T Single Synchronous Buck Pulse-Width Modulation (PWM) Controller
ISL6406CBZ-T Single Synchronous Buck Pulse-Width Modulation (PWM) Controller
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