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APW7098 Datasheet(PDF) 12 Page - Anpec Electronics Coropration

Part No. APW7098
Description  Two- Phase Buck PWM Controller with Integrated MOSFET Drivers
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Maker  ANPEC [Anpec Electronics Coropration]
Homepage  http://www.anpec.com.tw
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APW7098 Datasheet(HTML) 12 Page - Anpec Electronics Coropration

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Copyright
© ANPEC Electronics Corp.
Rev. A.7 - Oct., 2011
APW7098
www.anpec.com.tw
12
Pin Description (Cont.)
PIN
NO.
NAME
FUNCTION
10
DROOP
Load Line (droop) Setting. Connect a resistor between this pin and AGND to set the droop. A
sourcing current, proportional to output current is present on the DROOP pin. The droop scale
factor is set by the resistors (connected with CSP1, CSP2, and DROOP), resistance of the output
inductors, and the internal voltage divider with the ratio of 5%.
Operating Frequency Setting. The three-level input pin sets the operating frequency for each
channel.
RT
Operating Frequency (kHz)
GND
150
Floating
300
11
RT
5VCC
400
12
COMP
Error Amplifier Output. Connect the compensation network between COMP, FB, and VOUT for Type
2 or Type 3 feedback compensation.
13
FB
Feedback Voltage. This pin is the inverting input to the error comparator. A resistor divider from
the output to the AGND is used to set the regulation voltage.
14
SS
Soft-start Current Output. Connect a capacitor from this pin to the AGND to set the soft-start
interval. Pulling the voltage on this pin below 0.5V causes COMP to pull low and then shuts off the
output.
15
REFIN/EN
External Reference and Enable Input. The IC uses the voltage (VREFIN/EN) as reference voltage of
the converter with soft-start control. If this pin is driven by an external voltage ranged from 0.4V to
2V. The IC is disabled if the voltage is below 0.4V (typical). If external reference is not available,
then connect this pin to 5VCC for internal 0.6V reference.
16
REFOUT/PO
K
Power-OK and 1.5V Reference Output. This pin is a reference output used to indicate the status
of the voltages on SS pin and FB pin. REFOUT/POK provides 1.5V reference if VFB> 87.5% of
reference (VR).
17
BOOT2
Bootstrap Supply for the floating high-side gate driver of channel 2. Connect the Bootstrap
capacitor between the BOOT2 pin and the PHASE2 pin to form a bootstrap circuit. The bootstrap
capacitor provides the charge to turn on the high-side MOSFET. Typical values for CBOOT range
from 0.1
µF to 1µF. Ensure that C
BOOT is placed near the IC.
18
UGATE2
High-side Gate Driver Output for Channel 2. Connect this pin to the gate of high-side MOSFET.
This pin is monitored by the adaptive shoot-through protection circuitry to determine when the
high-side MOSFET has turned off.
19
PHASE2
Switch Node for Channel 2. Connect this pin to the source of high-side MOSFET and the drain of
the low-side MOSFET. This pin is used as sink for UGATE2 driver. This pin is also monitored by
the adaptive shoot-through protection circuitry to determine when the high-side MOSFET has
turned off. An Schottky diode between this pin and the ground is recommended to reduce
negative transient voltage that is common in a power supply system.
20
LGATE2
Low-side Gate Driver Output for Channel 2. Connect this pin to the gate of low-side MOSFET.
This pin is monitored by the adaptive shoot-through protection circuitry to determine when the
low-side MOSFET has turned off.
21
VCCDRV
Drive for External Linear Regulator. This pin is the drive output for the external linear regulator.
Connect this pin to base/gate of NPN/NMOS transistor as the pass element.
22
VCC
Supply Voltage. This pin along with VCCDRV pin and external pass element provides 8.5V
regulated bias supply, low-side gate drivers, and the bootstrap circuit for high-side drivers. This pin
can receive a well-decoupled 8V~13.2V supply voltage alone if the VCCDRV is left open. Ensure
that this pin is bypassed by a ceramic capacitor next to the pin.
23
LGATE1
Low-side Gate Driver Output for Channel 1. Connect this pin to the gate of low-side MOSFET.
This pin is monitored by the adaptive shoot-through protection circuitry to determine when the
low-side MOSFET has turned off.


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