BCM4354 Data Sheet
Internal Regulator Electrical Specifications
Section 18: Internal Regulator Electrical
Specifications
Note: Values in this data sheet are design goals and are subject to change based on the results of
device characterization.
Functional operation is not guaranteed outside of the specification limits provided in this section.
Core Buck Switching Regulator
Table 43: Core Buck Switching Regulator (CBUCK) Specifications
Specification
Notes
Min.
Typ.
Max. Units
5.25a
V
Input supply voltage (DC)
DC voltage range inclusive of
disturbances.
3.0
3.6
PWM mode switching frequency CCM, Load > 100 mA VBAT = 3.6V
2.8
–
4
5.2
600
–
MHz
mA
mA
V
PWM output current
Output current limit
Output voltage range
–
–
–
–
1400
1.35
Programmable, 30 mV steps
Default = 1.35V
1.2
1.5
PWM output voltage
DC accuracy
Includes load and line regulation.
Forced PWM mode
–4
–
–
7
4
%
PWM ripple voltage, static
Measure with 20 MHz bandwidth limit.
20
mVpp
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 mꢀ,
C
out > 1.9 μF, ESL<200pH
PWM mode peak efficiency
PFM mode efficiency
Peak Efficiency at 200 mA load
10 mA load current
78
70
–
86
81
–
–
%
%
µs
–
Start-up time from
power down
VIO already ON and steady.
Time from REG_ON rising edge to CLDO
reaching 1.2V
850
External inductor
0806 size, ± 30%, 0.11 ± 25% Ohms
–
2.2
4.7
–
µH
µF
2.0b
10c
External output capacitor
Ceramic, X5R, 0402,
ESR <30 mꢀ at 4 MHz, ± 20%, 6.3V
0.67b
External input capacitor
For SR_VDDBATP5V pin,
ceramic, X5R, 0603,
4.7
–
µF
ESR < 30 mꢀ at 4 MHz, ± 20%, 6.3V,
4.7 µF
Broadcom®
October 15, 2014 • 4354-DS109-R
Page 158
BROADCOM CONFIDENTIAL
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