BCM4354 datasheet(159/192 Pages) CYPRESS

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Internal Regulator Electrical Specifications

BCM4354 Data Sheet

BROADCOM CONFIDENTIAL

Broadcom®

October 15, 2014 • 4354-DS109-R

Page 158

Section 18: Internal Regulator Electrical

Specifications

Functional operation is not guaranteed outside of the specification limits provided in this section.

Core Buck Switching Regulator

Note: Values in this data sheet are design goals and are subject to change based on the results of

device characterization.

Table 43: Core Buck Switching Regulator (CBUCK) Specifications

Specification

Notes

Min.

Typ.

Max.

Units

Input supply voltage (DC)

DC voltage range inclusive of

disturbances.

3.0

3.6

5.25a

PWM mode switching frequency CCM, Load > 100 mA VBAT = 3.6V

2.8

5.2

MHz

PWM output current

–

600

Output current limit

–

1400

–

Output voltage range

Programmable, 30 mV steps

Default = 1.35V

1.2

1.35

1.5

PWM output voltage

DC accuracy

Includes load and line regulation.

Forced PWM mode

–4

–4%

PWM ripple voltage, static

Measure with 20 MHz bandwidth limit.

Static Load. Max. ripple based on

VBAT = 3.6V, Vout = 1.35V,

Fsw = 4 MHz, 2.2 μH inductor L > 1.05 μH,

Cap + Board total-ESR < 20 mΩ,

Cout > 1.9 μF, ESL<200pH

–

mVpp

PWM mode peak efficiency

Peak Efficiency at 200 mA load

–

PFM mode efficiency

10 mA load current

–

Start-up time from

power down

VIO already ON and steady.

Time from REG_ON rising edge to CLDO

reaching 1.2V

–

850

µs

External inductor

0806 size, ± 30%, 0.11 ± 25% Ohms

–

2.2

–

µH

External output capacitor

Ceramic, X5R, 0402,

ESR <30 mΩ at 4 MHz, ± 20%, 6.3V

2.0b

4.7

10c

µF

External input capacitor

For SR_VDDBATP5V pin,

ceramic, X5R, 0603,

ESR < 30 mΩ at 4 MHz, ± 20%, 6.3V,

4.7 µF

0.67b

4.7

–

µF

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