FAN53540 Fairchild Semiconductor, FAN53540 Datasheet - Page 3

• Manufacturer Part Number: FAN53540
• Description: The FAN53540 is a step-down switching voltage regulator that delivers an adjustable output from an input voltage supply of 2
• Manufacturer: Fairchild Semiconductor

© 2011 Fairchild Semiconductor Corporation
FAN53540 • Rev. 1.0.2
Pin Configuration
Pin Definitions
Bump #
C1 – C4
D1, D2,
D3, D4,
B2, B3,
E1, E2
E3, E4
A1
A2
A3
A4
B1
B4
PGOOD
Name
MODE
AGND
VOUT
GND
VIN
SW
EN
FB
PGOOD
MODE
A1
B1
C1
D1
E1
Figure 2. Top View
VIN
Power Good. This open-drain pin pulls LOW if the output falls out of regulation or is in soft-start.
Enable. The device is in Shutdown Mode when this pin is LOW. Do not leave this pin floating. When
tying HIGH, use at least a 1kΩ series resistor if V
FB. Connect to resistor divider. The IC regulates this pin to 0.8V.
VOUT. Sense pin for V
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
use at least a 1kΩ series resistor if V
Ground. Low-side MOSFET is referenced to this pin. C
path to these pins.
Analog Ground. All signals are referenced to this pin. Avoid routing high dV/dt AC currents through
this pin.
Power Input Voltage. Connect to input power source. Connect to C
Switching Node. Connect to inductor.
EN
A2
B2
C2
D2
E2
GND
FB
A3
B3
C3
D3
E3
SW
VOUT
A4
B4
C4
D4
E4
OUT
. Connect directly to C
IN
3
is expected to exceed 4.5V.
Description
MODE
OUT
IN
is expected to exceed 4.5V.
). Do not leave this pin floating. When tying HIGH,
.
Figure 3. Top View Bottom View
IN
and C
A4
B4
C4
D4
E4
OUT
A3
B3
C3
D3
E3
should be returned with a minimal
IN
with minimal path.
A2
B2
C2
D2
E2
C1
D1
A1
B1
E1
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