LP3972 datasheet(5/59 Pages) TI1

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LP3972

www.ti.com

SNVS468J – SEPTEMBER 2006 – REVISED AUGUST 2011

PIN DESCRIPTIONS (continued)

Pin No.

Name

I/O

Type(1)

Description

VIN Buck2

PWR

Battery input power to Buck2

SDA

I/O

I2C Data (Bidirectional)

SCL

I2C Clock

FB2

Buck2 input feedback terminal

nRSTO

Reset output from the PMIC to the processor

VOUT LDO5

PWR

LDO5 output

VIN LDO5

PWR

Power input to LDO5, this can be connected to VIN or to a separate 1.8V supply.

VDDA

PWR

Analog Power for VREF, BIAS

FB3

Buck3 Feedback

GPIO1 /

I/O

General Purpose I/O / Ext. backup battery charger enable pin. This pin enables

nCHG_EN

the main battery / DC source power to charge the backup battery. This pin

toggled via the application processor. By grounding this pin the DC source

continuously charges the backup battery

GPIO2

I/O

General Purpose I/O

VIN Buck3

PWR

Battery input power to Buck3

SW3

PWR

Buck3 switcher output

PGND3

Buck3 NMOS Power Ground

BGND1,2,3

Bucks 1, 2 and 3 analog Ground

SYNC

Frequency Synchronization: Connection to an external clock signal PLL to

synchronize the PMIC internal oscillator.

Input Digital enable pin for the high voltage power domain supplies. Output from

SYS_EN

the Monahans processor.

Digital enable pin for the Low Voltage domain supplies. Output signal from the

PWR_EN

Monahans processor

PGND1

Buck1 NMOS Power Ground

SW1

PWR

Buck1 Switcher output

VIN Buck1

PWR

Battery input power to Buck1

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

Absolute Maximum Ratings

(1) (2)

All Inputs

−0.3V to +6.5V

GND to GND SLUG

±0.3V

Junction Temperature (TJ-MAX)

150°C

Storage Temperature

−65°C to +150°C

Power Dissipation

(TA = 70°C)

(3)

3.2W

Junction-to-Ambient Thermal

Resistance

θJA

(3)

25°C/W

Maximum Lead Temp (Soldering)

260°C

ESD Rating (4)

Human Body Model

2 kV

Machine Model

200V

(1)

Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which

operation of the device is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits

and associated test conditions, see the Electrical Characteristics tables.

(2)

If Military/Aerospace specified devices are required, please contact the TI Sales Office/Distributors for availability and specifications.

(3)

In applications where high power dissipation and/or poor package thermal resistance is present, the maximum ambient temperature may

have to be derated. Maximum ambient temperature (TA-MAX) is dependent on the maximum operating junction temperature (TJ-MAX-

OP = 125°C), the maximum power dissipation of the device in the application (PD-MAX), and the junction-to ambient thermal resistance

of the part/package in the application (

θJA), as given by the following equation: TA-MAX = TJ-MAX-OP – (θJA x PD-MAX).

(4)

The Human body model is a 100 pF capacitor discharged through a 1.5 k

Ω resistor into each pin. (MIL-STD-883 3015.7) The machine

model is a 200 pF capacitor discharged directly into each pin. (EAIJ).

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