LP3907QTLX-VXSS/NOPB National Semiconductor, LP3907QTLX-VXSS/NOPB Datasheet - Page 31

• 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

LP3907 Control Registers
INTERRUPT STATUS REGISTER (ISRA) 0X02
This register informs the System Engineer of the temperature status of the chip.
CONTROL 1 REGISTER (SCR1) 0X07
This register allows the user to select the preset delay sequence for power-on timing, to switch between PFM and PWM mode for
the bucks, and also to select between an internal and external clock for the bucks.
Name
Access
Data
Reset
Name
Access —
Data
Reset
Register
Address
0x2A
0x2B
0x3A
0x02
0x07
0x10
0x11
0x20
0x23
0x24
0x25
0x29
0x38
0x39
—
Reserved
0
BKLDOEN
BKLDOSR
LDO1VCR
LDO2VCR
Register
D7
B1TV1
B1TV2
B2TV1
B2TV2
VCCR
Name
SCR1
B1RC
B2RC
BFCR
ICRA
—
—
Reserved
0
EN_DLY
R/W
Selects the preset
delay sequence
from EN_T assertion
(shown below)
Factory-
Programmed
Default
D7-2
Read/
Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
D6-4
R
R
Temp 125°C
R
Status bit for thermal warning
PMIC T>125°C
0
0 – PMIC Temp. < 125°C
1 – PMIC Temp. > 125°C
Interrupt Status Register A
System Control 1 Register
Buck and LDO Output Voltage Enable Register
Buck and LDO Output Voltage Status Register
Voltage Change Control Register 1
Buck1 Target Voltage 1 Register
Buck1 Target Voltage 2 Register
Buck1 Ramp Control
Buck2 Target Voltage 1 Register
Buck2 Target Voltage 2 Register
Buck2 Ramp Control
Buck Function Register
LDO1 Voltage control Registers
LDO2 Voltage control Registers
—
—
Reserved
1
D3
FPWM2
R/W
Buck2 PWM /PFM
Mode select
0 – Auto Switch PFM -
PWM operation
1 – PWM Mode Only
Factory-Programmed
Default
31
D2
D1
Register Description
FPWM1
R/W
Buck 1 PWM /PFM
Mode select
0 – Auto Switch PFM -
PWM operation
1 – PWM Mode Only
Factory-Programmed
Default
D1
ECEN
R/W
Reserved
0
—
—
Reserved
0
D0
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D0