NPIZ datasheet(18/24 Pages) ENPIRION

18 / 24 page

06489

April 16, 2012

Rev: C

EN6360QI

Enpirion Confidential

www.enpirion.com, Page 18

capacitance from 100µF to 1000µF may be placed

beyond the voltage sensing point outside the

control loop. This additional capacitance should

have a minimum ESR of 6m

to ensure stable

operation. Most tantalum capacitors will have more

than 6m

of ESR and may be used without special

care. Adding distance in layout may help increase

the ESR between the feedback sense point and the

bulk capacitors.

Table 4: Recommended Output Capacitors

Description

MFG

P/N

47µF, 10V, 20%

X5R, 1206

(2 capacitors needed)

Taiyo Yuden

LMK316BJ476ML-T

47µF, 6.3V, 20%

X5R, 1206

(2 capacitors needed)

Murata

GRM31CR60J476ME19L

Taiyo Yuden

JMK316BJ476ML-T

10µF, 6.3V, 10%

X7R, 0805

(Optional 1 capacitor in

parallel with 2x47µF)

Murata

GRM21BR70J106KE76L

Taiyo Yuden

JMK212B7106KG-T

Output ripple voltage is primarily determined by the

aggregate output capacitor impedance. Placing

multiple

capacitors

parallel

reduces

the

impedance and hence will result in lower ripple

voltage.

Total

...

Table 5: Typical Ripple Voltages

Output Capacitor

Configuration

Typical Output Ripple (mVp-p)

2 x 47 µF

<10mV

† 20 MHz bandwidth limit measured on Evaluation Board

M/S - Ternary Pin

M/S is a ternary pin. This pin can assume 3 states

– A low state (0V to 0.7V), a high state (1.8V to

VIN) and a float state (1.1V to 1.4V). Device

operation is controlled by the state of the pin. The

pins may be pulled to ground or left floating without

any special care. When pulling high to VIN, a series

resistor is recommended. The resistor value may

be optimized to reduce the current drawn by the

pin. The resistance should not be too high as in that

case the pin may not recognize the high state. The

recommend resistance (REXT) value is given in the

following table.

Table 5: Recommended REXT Resistor

VIN (V)

IMAX (µA)

REXT (k )

2.5 – 4.0

117

4.0 – 6.6

Figure 7:

Selection of REXT to Connect M/S pin to VIN

Table 6: M/S (Master/Slave) Pin States

M/S Pin

Function

Low

(0V to 0.7V)

M/S pin is pulled to ground directly. This is

the Master mode. Switching PWM phase

will lock onto S_IN external clock if a signal

is available. S_OUT outputs a version of

the internal switching PWM signal.

Float

(1.1V to 1.4V)

M/S pin is left floating. Parallel operation is

not feasible. Switching PWM phase will

lock onto S_IN external clock if a signal is

available. S_OUT outputs a version of the

internal switching PWM signal.

High

(>1.8V)

M/S pin is pulled to VIN with REXT. This is

the Slave mode. The S_IN signal of the

Slave should connect to the S_OUT of the

Master device. This signal synchronizes

the switching frequency and duty cycle of

the Master to the Slave device.

Power-Up Sequencing

During power-up, ENABLE should not be asserted

before PVIN, and PVIN should not be asserted

before AVIN. Tying all three pins together meets

these requirements.

Technical Suport

Contact Enpirion Applications for additional support

regarding

the

use

this

product

(techsupport@enpirion.com).

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