Manual

MAX8649
1.8A Step-Down Regulator with Differential
Remote Sense in 2mm x 2mm WLP
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POINTER REGISTER POR BIT7 BIT6 BIT5 BIT4 BIT3 BIT2 BIT1 BIT0
0x00 MODE0 0xB4
OPER
MODE
SYNC
MODE
OUT MODE0[5:0]
0x01 MODE1 0x1E
OPER
MODE
SYNC
MODE
OUT MODE1[5:0]
0x02 MODE2 0xB0
OPER
MODE
SYNC
MODE
OUT MODE2[5:0]
0x03 MODE3 0x9E
OPER
MODE
SYNC
MODE
OUT MODE3[5:0]
0x04 CONTROL 0xE0 EN_PD VID0_PD VID1_PD — — — — —
0x05 SYNC 0x00 SYNC[1:0] — — — — — —
0x06 RAMP 0x01 RAMP[2:0] FORC E _H Y S FORC E _OS C — RAM P _D OWN —
0x08 CHIP_ID1 0x20 DIE TYPE[7:4] DIE TYPE[3:0]
0x09 CHIP_ID2 0x0D DASH[3:0] MASK REV[3:0]
Table 2. I
2
C Register Map
REGISTER NAME MODE0
Address 0x00h
Reset Value 0xB4h
Type Read/write
Special Features Reset upon V
DD
or IN1 UVLO
BIT NAME DESCRIPTION
DEFAULT
VALUE
B7 (MSB) OPERATION_MODE0
DC-DC Step-Down Converter Operation Mode for MODE0
0 = D C - D C conver ter autom ati cal l y chang es b etw een hyster eti c m od e for
l i ght load condi ti ons and PWM mod e for m ed ium to heavy l oad cond i tions.
1 = DC-DC converter operates in forced-PWM mode.
1
B6 SYNC_MODE0
Disable/Enable Synchronization to External Clock
0 = DC-DC converter ignores the external SYNC input regardless of
operation mode.
1 = D C - D C conver ter synchr oni zes to exter nal S Y N C i np ut w hen avai l ab l e.
0
B5
B4
B3
B2
B1
B0 (LSB)
OUT_ MODE0 [5:0]
Output Voltage Selection for MODE0
000000 = 0.75V
000001 = 0.76V
110011 = 1.26V
110100 = 1.27V
110101 = 1.28V
111110 = 1.37V
111111 = 1.38V
110100
Table 3. I
2
C Register: MODE0
This register contains output voltage and operation mode control for MODE0, VID0 = GND, VID1 = GND.