BCM4339 Preliminary 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 45: 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
MHz
PWM output current
Output current limit
Output voltage range
–
–
–
–
600
mA
mA
V
–
1400
1.35
Programmable, 30 mV steps
Default = 1.35V
1.2
1.5
4
PWM output voltage
DC accuracy
Includes load and line regulation.
Forced PWM mode
–4
–
–
7
%
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 Peak Efficiency at 200 mA load
78
70
–
86
81
–
–
%
%
µs
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
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®
November 17, 2014 • 4339-DS106-R
Page 151
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