MAX8660BETL+ Maxim Integrated Products, MAX8660BETL+ Datasheet - Page 38

• Manufacturer Part Number: MAX8660BETL+
• Description: Other Power Management Low-IQ PMIC w/Dynamic V Mgt
• Manufacturer: Maxim Integrated Products

Specifications of MAX8660BETL+

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

High-Efficiency, Low-I
Voltage Management for Mobile Applications
Figure 11. Writing to the MAX8660/MAX8661
The REG1 and REG2 regulators each have three preset
voltages that are programmed with the SET1 and SET2
inputs. See the REG1 (VCC_IO) Step-Down DC-DC
Converter and REG2 (VCC_IO, VCC_MEM) Step-Down
DC-DC Converters sections for more information. V8 is
fixed at 3.3V and cannot be changed.
V3–V7 are set by the I
Interface section for more information. Note that while
operating in forced-PWM mode with an input voltage
greater than 4.3V, the minimum output voltage of REG3
and REG4 is limited by the minimum duty cycle. In
forced-PWM mode, the minimum output voltage for
REG3 or REG4 is:
Note that the above minimum voltage limitation does
not apply to normal-mode operation.
38
______________________________________________________________________________________
A. WRITING TO A SINGLE REGISTER WITH THE “WRITE BYTE” PROTOCOL
B. WRITING TO MULTIPLE REGISTERS WITH THE “MULTIPLE-BYTE REGISTER-DATA PAIR” PROTOCOL
1
S
S
1
MASTER TO SLAVE
SLAVE TO MASTER
V
V
SLAVE ADDRESS
SLAVE ADDRESS
4
3
Setting the Output Voltages
MIN
MIN
LEGEND
7
7
=
=
2
0 167
0 167
R/W
R/W
Design Procedure
C interface. See the I
.
.
x V
x V
1
0
1
0
A
A
A
1
1
PV
PV
3
4
REGISTER POINTER X
REGISTER POINTER n
REGISTER POINTER Z
REGISTER POINTER
8
8
8
8
Q
, PMICs with Dynamic
2
C
1
A
1
A
A
A
1
1
Calculate the inductor value (L
through REG4 as follows:
This sets the peak-to-peak inductor current ripple to 1/4
the maximum output current. The oscillator frequency,
f
Given L
is 0.25 x I
x I
inductor exceeds the peak inductor current, and the
rated maximum DC inductor current exceeds the maxi-
mum output current (I
smaller than L
size; however, if much smaller values are used, peak
inductor current rises and a larger output capacitance
may be required to suppress output ripple. Larger
OSC
OUT(MAX)
, is 2MHz, and the duty cycle, D, is:
DATA Z
DATA X
DATA n
DATA
IDEAL
8
8
8
8
OUT(MAX)
. Make sure that the saturation current of the
L
IDEAL
, the peak-to-peak inductor ripple current
IDEAL
. The peak inductor current is 1.125
1
1
1
1
A
A
A
A
=
can be used to reduce inductor
4
1
P
1
P
D
I
OUT MAX
OUT(MAX)
x V
=
IN
V
(
OUT
V
NUMBER OF BITS
IN
x D x
IDEAL
NUMBER OF BITS
NUMBER OF BITS
NUMBER OF BITS
Inductor Selection
)
). Inductance values
x f
1 (
OSC
) for each of REG1
−
D
)