LP3907QTLX-VXSS/NOPB National Semiconductor, LP3907QTLX-VXSS/NOPB Datasheet - Page 32

• Manufacturer Part Number: LP3907QTLX-VXSS/NOPB
• Description: IC REG BUCK SYNC-2 LDO-2 25MSMD
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LP3907QTLX-VXSS/NOPB

• Topology: Step-Down (Buck) Synchronous (2), Linear (LDO) (2)
• Function: Any Function
• Number Of Outputs: 4
• Frequency - Switching: 2.1MHz
• Voltage/current - Output 1: 1.8V, 1A
• Voltage/current - Output 2: 3.3V, 600mA
• Voltage/current - Output 3: 2.8V, 300mA
• W/led Driver: No
• W/supervisor: No
• W/sequencer: Yes
• Voltage - Supply: 2.8 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 25-UFBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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EN_DLY PRESET DELAY SEQUENCE AFTER EN_T ASSERTION
BUCK AND LDO OUTPUT VOLTAGE ENABLE REGISTER (BKLDOEN) – 0X10
This register controls the enables for the Bucks and LDOs.
BUCK AND LDO STATUS REGISTER (BKLDOSR) – 0X11
This register monitors whether the Bucks and LDOs meet the voltage output specifications.
BUCK VOLTAGE CHANGE CONTROL REGISTER 1 (VCCR) – 0X20
This register selects and controls the output target voltages for the buck regulators.
Name
Access
Data
Reset
Name
Access
Data
Reset
Name
Access
Data
Reset
BKS_OK
R
0 – Buck 1-2
Not Valid
1 – Bucks
Valid
0
—
—
Reserved
00
—
—
Reserved
0
D7-6
EN_DLY<2:0>
D7
D7
000
001
010
011
100
101
110
111
B2VS
R/W
Buck2 Target Voltage
Select
0 – B2VT1
1 – B2VT2
0
LDO2EN
R/W
0 – Disable
1 – Enable
1
LDOS_OK
R
0 – LDO 1-2
Not Valid
1 – LDOs Valid
0
D6
D6
D5
—
—
Reserved
1
LDO2_OK
R
0 – LDO2 Not
Valid
1 – LDO2 Valid
0
D5
B2GO
R/W
Buck2 Voltage Ramp
CTRL
0 – Hold
1 – Ramp to B2VS
selection
0
D5
Buck1
1.5
1.5
1.5
1.5
1
1
3
2
LDO1EN
R/W
0 – Disable
1 – Enable
1
D4
LDO1_OK
R
0 – LDO1 Not
Valid
1 – LDO1 Valid
0
D4
32
D4
—
—
Reserved
00
—
—
Reserved
0
D3-2
Buck2
D3
—
—
Reserve
d
0
1.5
1.5
1
2
2
2
2
3
D3
Delay (ms)
B1VS
R/W
Buck1 Target Voltage
Select
0 – B1VT1
1 – B1VT2
0
BK2EN
R/W
0 – Disable
1 – Enable
1
BK2_OK
R
0 – Buck2 Not
Valid
1 – Buck2
Valid
0
D2
D2
D1
LDO1
1
2
3
1
3
2
1
6
—
—
Reserved
0
—
—
Reserve
d
0
D1
D1
B1GO
R/W
Buck1 Voltage Ramp
CTRL
0 – Hold
1 – Ramp to B1VS
selection
0
BK1_OK
R
0 – Buck1 Not
Valid
1 – Buck1
Valid
0
BK1EN
R/W
0 – Disable
1 – Enable
1
LDO2
D0
1.5
11
1
2
6
1
6
2
D0
D0