ISL9113

9

FN8313.3

February 23, 2015

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Output Voltage Setting Resistor Selection

shown in the Block Diagram “ISL9113ERAZ” on page 3, set the

desired output voltage values. The output voltage can be

calculated using Equation 1:

current flowing through the divider resistors is calculated as

current into the divider and thus improve the total efficiency of

the device to prevent noise pickup.

Inductor Selection

An inductor with core material suitable for high frequency

applications (e.g., ferrite) is desirable to minimize core loss and

improve efficiency. The inductor should have a low ESR to reduce

copper loss. Moreover, the inductor saturation current should be

higher than the maximum peak current of the device; i.e., 1.5A.

The device is designed to operate with an inductor value of 2.2µH

to provide stable operation across the range of load, input and

output voltages. Stable mode switching between PWM and skip

mode operation is guaranteed at this inductor value. Table 2

shows recommended inductors.

Capacitor Selection

INPUT CAPACITOR

A minimum of a 4.7µF ceramic capacitor is recommended to

provide stable operation under typical operating conditions. For

input voltage less than 1.0V application, an additional 4.7µF

ceramic capacitor is recommended for better noise filtering and

EMI suppression. The input capacitor should be placed close to

the input pin, GND pin and the non-switching terminal of the

inductor.

OUTPUT CAPACITOR

For the output capacitor, a ceramic capacitor with small ESR is

recommended to minimize output voltage ripple. A typical 4.7µF

should be used to provide stable operation at different typical

operating conditions. The output capacitor should be placed

close to the output pin and GND pin of the device. Table 3 shows

the recommended capacitors.

TABLE 1. FAULT DETECTION AND RESPONSE

FAULT CONDITION

DETECTION DETAILS

ACTION

Low Battery Voltage

automatically restarts after 200ms.

out of regulation due to overload condition.

Short Circuit

Shut down immediately. Device automatically restarts

after 200ms.

Over-temperature Protection

Die temperature is > +150°C

Switching stops. Device automatically restarts when

temperature decreases to +125°C.

Switching stops until EN pin is toggled or power is

cycled.

TABLE 2. INDUCTOR VENDOR INFORMATION

MANUFACTURER

PART NUMBER

DIMENSIONS- W x L x H (mm)

Murata

LQH32PN2R2NN0L

3.2 x 2.5 x 1.7(max)

Toko

1239AS-H-2R2M

2.5 x 2.0 x 1.2(max)

1286AS-H-2R2M

2.0 x 1.6 x 1.2(max)

TDK

TFM201610A-2R2M

2.0 x 1.6 x 1.0(max)

Cyntec

PSE25201B-2R2MS

2.0 x 1.6 x 1.2(max)

-------

+









=

(EQ. 1)

TABLE 3. CAPACITOR VENDOR INFORMATION

MANUFACTURER

SERIES

WEBSITE

AVX

X5R

www.avx.com

Murata

X5R

www.murata.com

Taiyo Yuden

X5R

www.t-yuden.com

TDK

X5R

www.tdk.com