MAX8620YETD+T Maxim Integrated Products, MAX8620YETD+T Datasheet - Page 12

• 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

RESET is an open-drain, active-low output that indi-
cates the status of OUT1. RESET is typically pulled up
through a 100kΩ resistor to the system logic voltage.
RESET asserts at power-up. The reset timer begins
once V
deasserts 60ms after V
regulation (see the Typical Operating Characteristics).
RESET also asserts when OUT1 is disabled.
An optional 0.01µF bypass capacitor at BP creates a
lowpass filter for LDO noise reduction. OUT1 and OUT2
exhibit 45µV
0.01µF and C
V
age-lockout threshold (V
enables OUT3 to begin power-supply sequencing (see
the Power-Supply Sequencing section). The UVLO
threshold hysteresis is typically 0.5V.
The MAX8620Y 300mA LDOs limit their output current to
I
I
step-down converter limits I
Thermal-overload protection limits total power dissipa-
tion in the MAX8620Y. Independent thermal-protection
circuits monitor the step-down converter and the linear-
regulator circuits. When the MAX8620Y junction temper-
ature exceeds T
protection circuit disables the corresponding circuitry,
allowing the IC to cool. The thermal-overload protection
circuitry enables the MAX8620Y after the junction tem-
perature cools by 15°C, resulting in a pulsed output dur-
ing continuous thermal-overload conditions. Thermal-
overload protection safeguards the MAX8620Y in the
µPMIC for Microprocessors or DSPs
in Portable Equipment
12
LIM_
LIM_
IN1
, the corresponding LDO output voltage drops. The
______________________________________________________________________________________
Reference Bypass Capacitor Node (BP)
= V
= 550mA (typ). If the LDO output current exceeds
OUT1
IN2
must exceed the 2.85V typical undervolt-
RMS
OUT1
reaches 87% of regulation. RESET
J
of output-voltage noise with C
Thermal-Overload Protection
= C
= +160°C, the thermal-overload
OUT2
OUT1
UVLO
LIM3P
Undervoltage Lockout
Reset Output ( RESET )
= 4.7µF.
rises above 87% (typ) of
) before the MAX8620Y
to 675mA (min).
Current Limiting
BP
=
event of fault conditions. For continuous operation, do
not exceed the absolute-maximum junction-tempera-
ture rating of T
When the MAX8620Y is used in conjunction with a
microcontroller, HF_PWR and PWR_ON can implement
a short-key power-on closed-loop system
The MAX8620Y detects a rising edge at HF_PWR and
generates an internal 1.31s (typ) one-shot pulse that
begins power sequencing and temporarily enables
OUT1, OUT2, and OUT3 (depending on the state of
EN2). The 1.31s of power provides time for the proces-
sor to initialize and assert a logic-high at PWR_ON.
Once PWR_ON is driven high, OUT3, OUT1, and OUT2
(depending on the state of EN2) remain enabled. If the
microcontroller does not drive PWR_ON high during
t
and reenters shutdown.
Figure 5. Short-Key Power-On Closed-Loop System
HF
, the MAX8620Y disables OUT1, OUT2, and OUT3,
POWER-ON
KEY
1MΩ
J
Applications Information
= +150°C.
Power-On Closed-Loop System
HF_PWR
PWR_ON
MAX8620Y
POWER-HOLD SIGNAL
V
V
V
CORE
I/O
ANA
(Figure 5).
PWR HOLD
µP