Datasheet

Connection Diagram and Package Mark Information

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5 Connection Diagram and Package Mark Information

Figure 2. 6-Bump Thin DSBGA Package, Large Bump

Table 1. Pin Descriptions

Pin DSBGA Name Description

A1 EN Enable pin. The device is in shutdown mode when voltage to this pin is <0.4V and enabled

when >1.2V.

Do not leave this pin floating.

B1 MODE MODE Pin: Mode = 1, Forced PWM

Mode = 0, ECO

Do not leave this pin floating.

Setting the Mode pin low (<0.4V) places the LM3691 in ECO mode. During Auto mode the

device automatically switches between ECO/PWM depending on the load. Setting mode pin

high (>1.2V) places the part in Forced PWM. The part is in forced PWM regardless of the

load.

C1 FB Feedback analog input. Connect directly to the output filter capacitor. (Figure 1)

A2 VIN Power supply input. Connect to the input filter capacitor. (Figure 1)

B2 SW Switching node connection to the internal PFET switch and NFET synchronous rectifier.

C2 GND Ground pin.

6 BOM for Common Configurations

Mfr. Part # Description Designation Quantity

Texas LM3691 DC/DC converter U1 1

Instruments

TDK C1608X5R0J475K 4.7 µF, 6.3V, 0603 ceramic C1 1

capacitor

TDK C1608X5R0J475K 4.7 µF, 6.3V, 0603 ceramic C2 1

capacitor

Murata LQM2HPN1R0MG0 1 µH Multilayer chip inductor L1 1

AN-1772 LM3691 Evaluation Board SNVA312B–May 2008–Revised April 2013

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