ADP1034ACPZ-1-R7 datasheet(37/41 Pages) AD

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Data Sheet

ADP1034

APPLICATIONS INFORMATION

analog.com

Rev. 0 | 37 of 41

BUCK REGULATOR COMPONENT SELECTION

Inductor

The value of the inductor for the ADP1034 buck regulator affects

the efficiency and the output voltage ripple. Larger value inductors

typically improve efficiency. However, for a given package size, as

load increases, the dc resistance (DCR) and core losses eventually

have an increased negative impact on efficiency. Using a smaller

value inductor reduces output voltage ripple but can decrease the

overall efficiency due to increased switching losses.

Output Capacitor

The output capacitor selection affects the output ripple voltage,

load step transient, and the loop stability of the regulator. A 10 μF

capacitor is recommended as a balance between performance and

size, but larger capacitor can be used to reduce output ripple.

INVERTING REGULATOR COMPONENT

SELECTION

Inductor

The value of the inductor for the ADP1034 inverting regulator

affects the efficiency and the output voltage ripple. Larger value

inductors typically improve efficiency. However, for a given package

size, as load increases, the DCR and core losses eventually have

an increased negative impact on efficiency. Using a smaller value

inductor reduces output voltage ripple but can decrease the overall

efficiency due to increased switching losses.

Output Capacitor

The output capacitor selection affects the output ripple voltage, load

step transient, and the loop stability of the regulator. A minimum

of 4.7 µF capacitor is recommended to maintain stability across

VOUT1 and the output load.

Inverting Regulator Stability

The ADP1034 inverting regulator uses internal compensation and

operates with an inductance of 100 µH and a typical capacitance

of 4.7 µF. Using different component values may result in instability

of VOUT3, particularly if lower capacitance and smaller inductor

values are used. Consult Analog Devices for guidance. Operating

the inverter with the recommended inductor and output capacitor,

the output is stable from no load to a 15 mA load for any output

from −24 V to −2 V. When increasing the load beyond 15 mA, use a

larger output capacitor to stabilize the feedback loop, particularly for

lower output voltages.

Table 20. Buck Regulator and Inverting Regulator Recommended Inductors

Part Number

Manufacturer

Inductance (µH)

DCR (Ω)

Saturation Current1 (mA)

Size: Length × Width ×

Height (mm)

744043101

Würth Elektronik

100

0.55

290

4.8 × 4.8 × 2.8

XFL3012-104MEB

Coilcraft

100

2.63

280

3.2 × 3.2 × 1.3

LQH3NPN101MMEL

Murata

100

1.59

260

3 × 3 × 1.4

SRN3015-101M

Bourns

100

2.92

270

3 × 3 × 1.5

SRU2016-101Y

Bourns

100

4.9

150

2.8 × 2.8 × 1.65

XFL2006-104MEB

Coilcraft

100

11.1

115

2 × 2 × 0.6

1 30% drop in inductance.

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