CYW4343X
19. Internal Regulator Electrical Specifications
Note: Values in this data sheet are design goals and are subject to change based on device characterization results.
Functional operation is not guaranteed outside of the specification limits provided in this section.
19.1 Core Buck Switching Regulator
Table 42. Core Buck Switching Regulator (CBUCK) Specifications
Specification
Notes
Min.
2.4
Typ.
3.6
Max.
4.8a
Units
Input supply voltage (DC)
DC voltage range inclusive of disturbances.
CCM, load > 100 mA VBAT = 3.6V.
V
PWM mode switching
frequency
–
4
–
MHz
PWM output current
Output current limit
Output voltage range
–
–
–
–
370
–
mA
mA
V
–
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 mΩ,
Cout > 1.9 μF, ESL<200 pH
PWM mode peak efficiency
PFM mode efficiency
Peak efficiency at 200 mA load, inductor DCR = 200
–
85
–
%
%
µs
mΩ, VBAT = 3.6V, VOUT = 1.35V
10 mA load current, inductor DCR = 200 mΩ, VBAT = –
3.6V, VOUT = 1.35V
77
–
Start-up time from
power down
VDDIO already ON and steady.
Time from REG_ON rising edge to CLDO reaching
1.2V
–
–
400
500
External inductor
0603 size, 2.2 μH ±20%,
DCR = 0.2Ω ± 25%
2.2
4.7
4.7
–
µH
µF
µF
2.0b
10c
–
External output capacitor
External input capacitor
Ceramic, X5R, 0402,
ESR <30 mΩ at 4 MHz, 4.7 μF ±20%, 10V
0.67b
For SR_VDDBATP5V pin,
ceramic, X5R, 0603,
ESR < 30 mΩ at 4 MHz, ±4.7 μF ±20%, 10V
Input supply voltage ramp-up time
0 to 4.3V
40
–
–
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.
c. Total capacitance includes those connected at the far end of the active load.
19.2 3.3V LDO (LDO3P3)
Table 43. LDO3P3 Specifications
Specification
Input supply voltage, Vin
Notes
Min.
3.1
Typ.
3.6
Max.
4.8a
Units
Min. = Vo + 0.2V = 3.5V dropout voltage
requirement must be met under maximum load
for performance specifications.
V
Output current
–
0.001
–
–
450
–
mA
V
Nominal output voltage, Vo
Default = 3.3V.
3.3
Dropout voltage
At max. load.
–
–
200
mV
Document No. 002-14797 Rev. *H
Page 107 of 128
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