LP3927 Datasheet, PDF (3/16 Pages) National Semiconductor (TI) – Cellular/PCS System Power Management IC

Pin Description
Pin
Name
Functional Description
1
VO1
150 mA, LDO1 output pin.
2
EN5
LDO5 enable input.
3
EN4
LDO4 enable input.
4
EN3
LDO3 enable input.
5
RST
Externally pulled high, open drain output to processor/memory reset.
6
IRQ
Externally pulled high, open drain output to processor interrupt indicating KYBD has gone
high.
7
PS_HOLD Input from the processor to the LP3927. A HIGH indicates a steady supply of power is
granted. Refer to ’Application Hints’ section for more detail.
8
KYBD
An active high input signal indicating the keyboard “On/Off” button has been asserted. Refer
to ’Application Hints’ section for more detail.
9
D_GND
Digital ground, used primarily for the digital and DAC circuits.
10
VEXT
Active low input indicating a battery charger insertion Refer to ’Application Hints’ section for
more detail.
11
BYP
Reference bypass pin.
12 TEST_MODE Pin used for production testing, factory use only. This pin should be grounded in applications.
13
LED_EN LED driver enable input.
14
LED
LED driver, drain connection of the LED drive MOSFET.
15
LED_PGM LED drive current programming pin.
16 OP_AMP_OUT Operational amplifier output pin.
17
IN−
− input of the Op-Amp.
18
IN+
+ input of the Op-Amp.
19 OP_AMP_V_DD Power supply pin for Op-Amp.
20
A_GND2 Ground for analog.
21
VO5
200 mA, LDO5 output pin.
22
V_DD3
Input power pin for LDO5. V_DD1, V_DD2 and V_DD3 must be tied together externally.
23
VO4
150 mA, LDO4 output pin.
24
V_DD2
Input power pin for LDO3 and LDO4. V_DD1, V_DD2 and V_DD3 must be tied together externally.
25
VO3
100 mA, LDO3 output pin.
26
A_GND1 Ground for analog.
27
VO2
200 mA, LDO2 output pin.
28
V_DD1
Input power pin for LDO1 and LDO2. V_DD1, V_DD2 and V_DD3 must be tied together externally.
3
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