BCM43455 Preliminary Data Sheet
Internal Regulator Electrical Specifications
Section 18: Internal Regulator Electrical
Specifications
Core Buck Switching Regulator
Note: Values in this data sheet are design goals and are subject to change based on device
characterization results.
Note: Functional operation is not guaranteed outside of the specification limits provided in this section.
Table 44: Core Buck Switching Regulator (CBUCK) Specifications
Specification
Notes
Min. Typ. Max. Unit
a
Input supply voltage (DC)
DC voltage range inclusive of disturbances.
CCM, Load > 100 mA VBAT = 3.6V
3.0
–
3.6
4
V
5.25
–
PWM mode switching
frequency
MHz
PWM output current
Output current limit
Output voltage range
–
–
–
600 mA
–
–
1400 –
mA
V
Programmable, 30 mV steps. Default = 1.35V
1.2
–4
1.35 1.5
PWM output voltage DC
accuracy
Includes load and line regulation.
Forced PWM mode.
–
4
%
PWM ripple voltage, static
Measure with 20 MHz bandwidth limit.
–
7
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 mΩ, C > 1.9
out
μF, ESL<200 pH
PWM mode peak efficiency Peak Efficiency at 200 mA load
78
70
–
86
80
–
–
%
%
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.
400 500 μs
External inductor
0806 size, 2.2 µH, DCR=0.11Ω, ACR=1.18Ω @
4 MHz
–
2.2
4.7
4.7
–
–
μH
μF
μF
μs
b
External output capacitor
External input capacitor
Ceramic, X5R, 0402, ESR <30 mΩ at 4 MHz,
4.7 µF ±20%, 6.3V
2.0
10
b
For SR_VDDBATP5V pin, ceramic, X5R, 0603,
ESR < 30 mΩ at 4 MHz, ±4.7uF ±20%, 6.3V
–
0.67
Input supply voltage ramp-up 0 to 4.3V
time
40
–
a. The maximum continuous voltage is 5.25V. Voltages up to 6.0V for up to 10 seconds, cumulative duration, over
the lifetime of the device are allowed. Voltages as high as 5.0V for up to 250 seconds, cumulative duration, over
the lifetime of the device are allowed.
b. Total capacitance includes those connected at the far end of the active load.
Broadcom®
November 5, 2015 • 43455-DS109-R
Page 130
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