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| 型号： | ISL8510EVAL1Z |
| 厂商： | Intersil |
| 文件页数： | 14/21页 |
| 文件大小： | 0K |
| 描述： | EVALUATION BOARD FOR ISL8510 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，LDO 步降 |
| 输出及类型： | 3，非隔离 |
| 输出电压： | 3.3V，1.2V，1.8V |
| 电流 - 输出： | 1A，500mA，500mA |
| 输入电压： | 4.5 ~ 25 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 500kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ISL8510 |
ISL8510
Detailed Description
The ISL8510 combines a standard buck PWM controller with
an integrated switching MOSFET and one low dropout
(LDO) linear regulators with internal pass devices. The buck
controller drives an internal N-Channel MOSFET and
requires an external diode to deliver load current up to 1A. A
Schottky diode is recommended for improved efficiency and
performance over a standard diode. The standard buck
regulator can operate from either an unregulated DC source,
such as a battery, with a voltage ranging from +5.5V to +25V,
or from a regulated system rail of +5V. When operating from
+5.5V or greater, the controller is biased from an internal
+5V LDO voltage regulator. The converter output is
regulated down to 0.6V from either input source. The LDO
linear regulator can source up to 500mA continuous output
current with +2V or greater input supply and +1.0V or higher
output voltage. These features make the ISL8510 ideally
suited for FPGA and wireless chipset power applications.
The PWM control loop uses a single output voltage loop with
input voltage feed forward, which simplifies feedback loop
compensation and rejects input voltage variation. External
feedback loop compensation allows flexibility in output filter
component selection. The regulator switches at a fixed 500kHz.
The buck regulator and LDO are provided with independent
current limits. The current limit in the buck regulator is
achieved by monitoring the drain-to-source voltage drop of the
internal switching power MOSFET. The current limit threshold
is internally set at 2A. The part also features undervoltage
protection by latching the switching MOSFET driver to the
OFF state during an overcurrent, when the output voltage is
lower than 70% of the regulated output. This helps minimize
power dissipation during a short-circuit condition. Due to only
the switching power MOSFET integration, there is no
overvoltage protection feature for this part.
The ISL8510 monitors and controls the pass transistor ’s
gate voltage to limit the output current. The current limit for
LDO is 800mA typical. Neither LDO has over-voltage or
undervoltage protection. When the current limit in output is
reached, the output no longer regulates the voltage, but
regulates the current to the value of the current limit.
+5V Internal Bias Supply (VCC)
Voltage applied to the VIN pin with respect to GND is
regulated to +5V DC by an internal LDO regulator. The
output of the LDO, VCC, is the bias voltage used by all the
internal control and protection circuitry. The VCC pin
requires a ceramic capacitor connected to GND. The
capacitor serves to stabilize the LDO and to decouple load
transients.
The input voltage range for the ISL8510 is specified as
+5.5V to +25V or +5V ±10%. In the case of an unregulated
supply case, the power supply is connected to VIN only.
Once enabled, the linear regulator will turn-on and rise to
+5V on VCC. In the +5V supply case, the VCC and VIN pins
14
must be tied together to bypass the LDO. The external
decoupling capacitor is still required in this mode. Do not
short VCC to GND.
Operation Initialization
The power-on reset circuitry and enable inputs prevent false
startup of the PWM regulator and LDO outputs. Once all the
input criteria are met, the controller soft-starts the output
voltage to the programmed level.
Power-On Reset and Undervoltage Lockout
The PWM portion of the ISL8510 automatically initializes
upon receipt of input power. The power-on reset (POR)
function continually monitors the VCC and PVCC voltages.
While both are below their POR thresholds, the controller
inhibits switching of the internal power MOSFET. Once
exceeded, the controller initializes the internal soft-start
circuitry. If either input supply drops below their falling POR
threshold during soft-start or operation, the buck regulator
latches off.
LDO supply inputs, VIN_LDO allows flexibility in partitioning
linear regulator power. Power supplies connected to the
LDO supply input must exceed the undervoltage lockout
(UVLO) threshold before that LDO is initialized. If the input
supply drops below the falling UVLO threshold during
operation, the low dropout voltage regulator latches off.
Enable and Disable
All internal power devices are held in a high-impedance
state, which ensures they remain off while in shutdown
mode. Typically the enable input for a specific output is
toggled high after the input supply to that regulator is active
and the internal LDO has exceeded its POR threshold.
The EN_PWM pin enables the buck controller portion of the
ISL8510. When the voltage on the EN_PWM pin exceeds
the POR rising threshold, the controller initiates the soft-start
function for the PWM regulator. If the voltage on the
EN_PWM pin drops below the POR falling threshold, the
buck regulator shuts down.
ILDO enable input, EN_LDO allows independent control of
ISL8510 regulator. Make sure EN is on. When the voltage on
either pin exceeds the POR rising threshold, the linear
regulator operation is initiated for that controller. If the
voltage then drops below the hysteresis level for the enable
pin, the LDO shuts down.
Pulling the EN_PWM and EN_LDO pins low simultaneously
puts all outputs into shutdown mode, and the supply current
drops to 10μA typical.
Soft-Start
Once the input supply latch and enable threshold are met,
the soft-start function is initialized. The soft-start circuitry
begins sourcing 30μA, from an internal current source, which
charges the external soft-start capacitor. The voltage on SS
FN6516.2
December 15, 2008
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