FAN2315MPX Datasheet, PDF (3/19 Pages) Fairchild Semiconductor – FAN2315 TinyBuck 15 A Integrated Synchronous Buck Regulator

Pin Configuration
Figure 3. Pin Assignments, Bottom View
Figure 4. Pin Assignments, Top View
Pin Definitions
Name
PVIN
VIN
PVCC
VCC
PGND
AGND
SW
BOOT
ILIM
FB
EN
SS
FREQ
PGOOD
NC
Pad / Pin
Description
P2, 5-11 Power input for the power stage
1
Input to the modulator for input voltage feed-forward
25
Power input for the low-side gate driver and boot diode
26
Power supply input for the controller
18-21
Power ground for the low-side power MOSFET and for the low-side gate driver
P1, 4, 23 Analog ground for the analog portions of the IC and for substrate
P3, 2, 12-17, 22 Switching node; junction between high-and low-side MOSFETs
Supply for high-side MOSFET gate driver. A capacitor from BOOT to SW supplies the
3
charge to turn on the N-channel high-side MOSFET. During the freewheeling interval
(low-side MOSFET on), the high-side capacitor is recharged by an internal diode
connected to PVCC.
24
Current limit. A resistor between ILIM and SW sets the current limit threshold.
27
Output voltage feedback to the modulator
29
Enable input to the IC. Pin must be driven logic high to enable, or logic low to disable.
31
Soft-start input to the modulator
32
On-time and frequency programming pin. Connect a resistor between FREQ and
AGND to program on-time and switching frequency.
30
28, 33-34
Power good; open-drain output indicating V_OUT is within set limits.
Leave pin open or connect to AGND.
© 2011 Fairchild Semiconductor Corporation
FAN2315 • Rev. 1.0.4
3
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