Datasheet

LP3972
www.ti.com SNVS468K –SEPTEMBER 2006–REVISED MAY 2013
Default Voltage Option
(1)(2)(3)
Version LP3972SQ-A514 LP3972SQ-A413
Enable Version A Version A
LDO_RTC — 2.8 — 2.8
LDO1 SYS_EN 1.8 SYS_EN 1.8
LDO2 SYS_EN 1.8D SYS_EN 1.8D
LDO3 SYS_EN 3D SYS_EN 3D
LDO4 SYS_EN 3D SYS_EN 2.8D
LDO5 PWR_EN 1.4 PWR_EN 1.4
BUCK1 PWR_EN 1.4 PWR_EN 1.4
BUCK2 SYS_EN 3.3 SYS_EN 3
BUCK3 SYS_EN 1.8 SYS_EN 1.8
Version LP3972SQ-E514 LP3972SQ-I514
Enable Version E Version I
LDO_RTC — 2.8 — 2.8
LDO1 SYS_EN 1.8 SYS_EN 1.8
LDO2 SYS_EN 1.8E SYS_EN 1.8E
LDO3 SYS_EN 3D SYS_EN 3E
LDO4 SYS_EN 3D SYS_EN 3E
LDO5 PWR_EN 1.4 PWR_EN 1.4
BUCK1 PWR_EN 1.4 PWR_EN 1.4
BUCK2 SYS_EN 3.3 SYS_EN 3.3
BUCK3 SYS_EN 1.8 SYS_EN 1.8
Version LP3972SQ-I414 LP3972SQ-0514
Enable Version I Version 0
LDO_RTC — 2.8 Tracking enabled 3.3 w/ tracking
LDO1 SYS_EN 1.8 SYS_EN 1.8
LDO2 SYS_EN 1.8E SYS_EN 1.8E
LDO3 SYS_EN 3E SYS_EN 3.3E
LDO4 SYS_EN 3E SYS_EN 3E
LDO5 PWR_EN 1.4 PWR_EN 1.4
BUCK1 PWR_EN 1.4 PWR_EN 1.4
BUCK2 SYS_EN 3.0 SYS_EN 3.3
BUCK3 SYS_EN 1.8 SYS_EN 1.8
Version LP3972SQ-5810
Enable Version 5
LDO_RTC 2.8
LDO1 SYS_EN 1.8
LDO2 SYS_EN 1.8E
LDO3 SYS_EN 2.5E
LDO4 PWR_EN 1.3E
LDO5 PWR_EN 1.1
BUCK1 PWR_EN 1.35
BUCK2 SYS_EN 1.2
BUCK3 SYS_EN 1.8
(1) All voltages are with respect to the potential at the GND pin.
(2) The Human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin. (MIL-STD-883 3015.7) The machine
model is a 200 pF capacitor discharged directly into each pin. (EAIJ).
(3) E = Regulator is ENABLED during startup. D = Regulator is DISABLED during startup.
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