MAX77178 데이터 시트보기 (PDF) - Maxim Integrated
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MAX77178
Maxim Integrated
MAX77178 Datasheet PDF : 17 Pages
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MAX77178 / MAX77179
High-Bandwidth LTE/WCDMA PA Power Management ICs
in a 1.75mm x 1.4mm, 0.4mm Pitch WLP
Pin Configuration
TOP VIEW
(BUMPS ON BOTTOM)
MAX77178
1
2
3
4
+ AGND
EN
AGND
IN3
A
SEL0 GSNS
FB
LX
B
SEL1 PGND
IN2
IN1
C
WLP
1
+ REF
A
MAX77179
2
3
4
EN
AGND
IN3
MODE_SEL GSNS
FB
LX
B
BYP
PGND
IN2
IN1
C
WLP
Pin Description
PIN
MAX77178 MAX77179
A1
—
—
A1
A2
A2
A3
A3
A4
A4
B1
—
—
B1
B2
B2
B3
B3
B4
B4
NAME
FUNCTION
AGND
REF
EN
AGND
Ground Connection
DAC-Controlled Analog Input. It is used to set the PA voltage. Connect REF to a
DAC for PA power control.
Enable Input. Connect EN to IN_ or logic-high for normal operation. Connect EN to
AGND or logic-low for shutdown mode.
Low-Noise Analog Ground. Connect AGND to the IN3 decoupling capacitor and
then to PGND.
Analog Supply Voltage Input. Connect IN3 to a battery or supply voltage from 2.5V
IN3
to 5.5V. Bypass IN3 to AGND with a 1FF ceramic capacitor as close as possible to
the devices. Connect IN3 to the same source as IN1/IN2.
SEL0
Output-Voltage Selection Input 0. Connect SEL0 and SEL1 to logic-high or logic-low
to set the step-down converter output voltage to one of four voltage levels. See Table
1. SEL0 is internally connected to AGND through an 800kI pulldown resistor.
MODE_SEL
GSNS
FB
LX
Mode Selection Input. MODE_SEL adjusts the FET scaling threshold. MODE_SEL is
internally connected to AGND through an 800kI pulldown resistor.
Ground Sense Node. Connect GSNS to the same ground as the DAC used to control
REF. Alternatively, GSNS can be connected directly to AGND.
Output-Voltage Feedback Input. Connect FB directly to the load, ensuring that no
current is running in FB trace.
Inductor Connection. Connect an inductor from LX to the output of the DC-DC
converter. LX is high impedance during shutdown.
Maxim Integrated
10
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