MAX8620YETD+T Maxim Integrated Products, MAX8620YETD+T Datasheet - Page 9

• Manufacturer Part Number: MAX8620YETD+T
• Description: IC UPMIC FOR MPU 14-TDFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX8620YETD+T

• Applications: Micro-Power Management Integrated Circuit (UPMIC), DSPs
• Voltage - Input: 2.7 ~ 5.5 V
• Number Of Outputs: 3
• Voltage - Output: 0.6 ~ 3.3 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 14-TDFN Exposed Pad
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 45 C
• Output Current: 500 mA
• Output Voltage: 0.6 V to 3.3 V
• Supply Current: 115 uA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

As seen in
down converter feedback network. By taking feedback
from the LX node through R1, the usual phase lag due
to the output capacitor is removed, making the loop
exceedingly stable and allowing the use of a very small
ceramic output capacitor. This configuration causes the
output voltage to shift by the inductor series resistance
multiplied by the load current. This output-voltage shift
is known as voltage-positioning load regulation.
Voltage-positioning load regulation greatly reduces
overshoot during load transients, which effectively
halves the peak-to-peak output-voltage excursions
compared to traditional step-down converters. See the
Load-Transient Response graph in the Typical
Operating Characteristics section.
Two low-dropout, low-quiescent-current, high-accuracy
linear regulators supply loads up to 300mA each. The
LDO output voltages are set using SEL1 and SEL2 (see
Table 1). As shown in Figure 3, the LDOs include an
internal reference, error amplifiers, p-channel pass tran-
sistors, internal-programmable voltage-dividers, and an
OUT1 power-good comparator. Each error amplifier
Figure 2. Typical MAX8620Y DSP or µP Application
Voltage-Positioning Load Regulation
Figure 2, the MAX8620Y uses a unique step-
_______________________________________________________________________________________
V
BATT
CELL
Li+
POWER-ON
KEY
µPMIC for Microprocessors or DSPs
1MΩ
C
10µF
IN
C
0.01µF
BP
BP
SEL2
SEL1
HF_PWR
IN2
IN1
MAX8620Y
GND
PWR_ON
RESET
OUT1
OUT2
EN2
LX
FB
R1
150kΩ
compares the reference voltage to a feedback voltage
and amplifies the difference. If the feedback voltage is
lower than the reference voltage, the pass-transistor
gate is pulled lower, allowing more current to pass to
the outputs and increasing the output voltage. If the
feedback voltage is too high, the pass-transistor gate is
pulled up, allowing less current to pass to the output.
C
4.7µF
Table 1. MAX8620Y Output-Voltage
Selection
C
4.7µF
OUT2
OUT1
in Portable Equipment
R2
75kΩ
OPEN
OPEN
OPEN
SEL1
GND
GND
GND
IN1
IN1
IN1
150pF
2.2µH
C
FF
L
100kΩ
C
2.2µF
OUT3
OPEN
OPEN
OPEN
SEL2
GND
GND
GND
OUT3,
500mA
2.6V
300mA
2.6V
300mA
IN1
IN1
IN1
I/O
RESET IN
CORE
ANALOG
ON/OFF
DSP
µP
OR
OUT1
3.00V
2.85V
3.00V
3.30V
2.80V
3.30V
2.85V
2.60V
1.80V
OUT2
2.50V
2.85V
3.00V
2.50V
2.60V
1.80V
2.60V
2.60V
2.60V
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