BCM43903 Datasheet, PDF (70/87 Pages) Cypress Semiconductor – WICED™ IEEE 802.11 b/g/n SoC with an Embedded Applications Processor

BCM43903 Preliminary Data Sheet
Internal Regulator Electrical Specifications
Section 15: 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 24: Core Buck Switching Regulator (CBUCK) Specifications
Specification
Notes
Min. Typ. Max. Unit
Input supply voltage (DC)
DC voltage range inclusive of disturbances. 3.0 3.6 _4.8^a
PWM mode switching frequency CCM, load > 100 mA VBAT = 3.6V.
–
4
–
PWM output current
–
–
–
550
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 –4 –
4
mode.
PWM ripple voltage, static
Measure with 20 MHz bandwidth limit.
–
7
20
Static load. Max. ripple based on VBAT = 3.6V,
Vout = 1.35V, Fsw = 4 MHz,
2.2 μH inductor with min. effective L > 1.05 μH,
cap. + board total – ESR < 20 mΩ,
C_out > 1.9 μF, ESL<200 pH
PWM mode peak efficiency
Peak efficiency at 200 mA load.
78 86 –
PFM mode efficiency
10 mA load current.
70 81 –
Start-up time from power down VIO already ON and steady. Time from
–
REG_ON rising edge to CLDO reaching 1.2V.
400 500
External inductor
0806 size, 2.2 µH, DCR = 0.11Ω,
ACR = 1.18Ω @ 4 MHz.
–
2.2 –
External output capacitor
Ceramic, X5R, 0402, ESR <30 mΩ at 4 MHz, _2.0^b 4.7 ₁₀^c
4.7 µF ±20%, 6.3V.
External input capacitor
For SR_VDDBAT5V pin, ceramic, X5R, 0603, _0.67^b 4.7 –
ESR < 30 mΩ at 4 MHz, ±4.7 µF ±20%, 6.3V.
Input supply voltage ramp-up time 0 to 4.3V.
40 –
–
V
MHz
mA
mA
V
%
mVpp
%
%
µs
µH
µF
µF
µs
a. The maximum continuous voltage is 4.8V. 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. Minimum capacitor value refers to the residual capacitor value after taking into account the part-to-part tolerance,
DC-bias, temperature, and aging.
Broadcom^®
March 12, 2016 • 43903-DS102-R
BROADCOM CONFIDENTIAL
Page 69