EP53A7LQ Datasheet, PDF (2/17 Pages) Enpirion, Inc. – 1000mA Synchronous Buck Regulator with Integrated Inductor

Ordering Information
EP53A7LQI/EP53A7HQI
Pin Assignments (Top View)
Part Number
EP53A7LQI
EP53A7HQI
EP53A7LQI-E
EP53A7HQI-E
Comment
Package
LOW VID Range 16-pin QFN T&R
HIGH VID Range 16-pin QFN T&R
EP53A7LQI Evaluation Board
EP53A7HQI Evaluation Board
Figure 3: EP53A7LQI Pin Out Diagram (Top View)
Pin Description
Figure 4: EP53A7HQI Pin Out Diagram (Top View)
PIN
1, 15,
16
2
3
4
5
6
7, 8
NAME
NC(SW)
PGND
LLM
VFB
NC
VSENSE
AGND
VOUT
FUNCTION
NO CONNECT – These pins are internally connected to the common switching node of the
internal MOSFETs. NC (SW) pins are not to be electrically connected to any external signal,
ground, or voltage. However, they must be soldered to the PCB. Failure to follow this
guideline may result in part malfunction or damage to the device.
Power ground. Connect this pin to the ground electrode of the Input and output filter
capacitors.
LLM ( Light load mode – “LLM”) pin. Logic-High enables automatic LLM/PWM and logic-
low places the device in fixed PWM operation.
EP53A7LQI: Feed back pin for external resistor divider option.
EP53A7HQI: No Connect
Sense pin for preset output voltages. Refer to application section for proper configuration.
Analog ground. This is the quiet ground for the internal control circuitry, and the ground
return for external feedback voltage divider
Regulated Output Voltage. Refer to application section for proper layout and decoupling.
©Enpirion 2009 all rights reserved, E&OE
01543
2
11/11/2009
www.enpirion.com
Rev:B