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BCM4356 Advance Data Sheet
Internal Regulator Electrical Specifications
Section 18: Internal Regulator Electrical
Specifications
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
Input supply voltage (DC)
DC voltage range inclusive of
disturbances.
3.0 3.6 _5.25^a V
PWM mode switching frequency CCM, Load > 100 mA VBAT = 3.6V
2.8
PWM output current
–
–
Output current limit
–
–
Output voltage range
Programmable, 30 mV steps
1.2
Default = 1.35V
PWM output voltage
DC accuracy
Includes load and line regulation.
–4
Forced PWM mode
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,
C_out > 1.9 μF, ESL<200pH
PWM mode peak efficiency Peak Efficiency at 200 mA load
78
PFM mode efficiency
10 mA load current
70
Start-up time from
power down
VIO already ON and steady.
–
Time from REG_ON rising edge to CLDO
reaching 1.2V
4
5.2
–
600
1400
1.35 1.5
MHz
mA
mA
V
–
4
%
7
20
mVpp
86
–
%
81
–
%
–
850 μs
External inductor
0806 size, ± 30%, 0.11 ± 25% Ohms
–
2.2 –
μH
External output capacitor
External input capacitor
Input supply voltage ramp-up
time
Ceramic, X5R, 0402,
ESR <30 mΩ at 4 MHz, ± 20%, 6.3V
For SR_VDDBATP5V pin,
ceramic, X5R, 0603,
ESR < 30 mΩ at 4 MHz, ± 20%,
6.3V, 4.7 μF
0 to 4.3V
2.0^{b 4.7} 10^{c μF}
0.67^{b 4.7 –}
μF
40
–
–
μs
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 5.5V for up to 250 seconds, cumulative duration, over
the lifetime of the device are allowed.
Broadcom^®
May 8, 2015 • 4356-DS103-R
BROADCOM CONFIDENTIAL
Page 160