FAN53541 Datasheet, PDF (3/15 Pages) Fairchild Semiconductor – 2.4 MHz, 5 A TinyBuck Synchronous Buck Regulator

Pin Configuration
PGOOD EN
A1
A2
MODE
B1
B2
FB VOUT
A3
A4
GND
B3
B4
C1
C2
VIN
D1
D2
C3
C4
SW
D3
D4
E1
E2
E3
E4
Figure 2. Top View
A4
A3
A2
A1
B4
B3
B2
B1
C4
C3
C2
C1
D4
D3
D2
D1
E4
E3
E2
E1
Figure 3. Top View Bottom View
Pin Definitions
Bump #
A1
A2
A3
A4
B1
B2, B3,
C1 – C4
B4
D1, D2,
E1, E2
D3, D4,
E3, E4
Name
Description
PGOOD Power Good. This open-drain pin pulls LOW if the output falls out of regulation or is in soft-start.
EN Enable. The device is in Shutdown Mode when this pin is LOW. Do not leave this pin floating.
FB FB. Connect to resistor divider. The IC regulates this pin to 0.8 V.
VOUT
MODE
GND
VOUT. Sense pin for V_OUT. Connect directly to C_OUT.
MODE / SYNC. A logic 0 allows the IC to automatically switch to PFM during light loads. When held
HIGH, the IC to stays in PWM Mode. The regulator also synchronizes its switching frequency to four
times (4X) the frequency provided on this pin (f_MODE). Do not leave this pin floating.
Ground. Low-side MOSFET is referenced to this pin. C_IN and C_OUT should be returned with a minimal
path to these pins.
AGND
Analog Ground. All signals are referenced to this pin. Avoid routing high dV/dt AC currents through
this pin.
VIN Power Input Voltage. Connect to input power source. Connect to CIN with minimal path.
SW Switching Node. Connect to inductor.
© 2013 Fairchild Semiconductor Corporation
FAN53541 • Rev. 1.0.2
3
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