MAX8620YETD+T Maxim Integrated Products, MAX8620YETD+T Datasheet - Page 8

• 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

µPMIC for Microprocessors or DSPs
in Portable Equipment
The MAX8620Y µPMIC is designed to power low-core-
voltage microprocessors or DSPs in portable devices.
The µPMIC contains a fixed-frequency, high-efficiency
step-down converter; two low-dropout regulators
(LDOs); a 30ms (min) reset timer; and power-on/off
control logic (Figure 1).
The MAX8620Y step-down converter is optimized for
high-efficiency voltage conversion over a wide load
range while maintaining excellent transient response,
minimizing external component size, and minimizing
output voltage ripple. The DC-DC converter (OUT3)
also features an optimized on-resistance internal
MOSFET switch and synchronous rectifier to maximize
efficiency. The MAX8620Y utilizes a proprietary hys-
teretic-PWM control scheme that switches with nearly
Figure 1. Functional Diagram
8
_______________________________________________________________________________________
Step-Down DC-DC Control Scheme
C
BP
Detailed Description
PWR_ON
HF_PWR
SEL1
SEL2
BP
MAX8620Y
GND
IN1
REFERENCE
CONTROL
VOLTAGE
OUTPUT-
ENABLE
SELECT
LOGIC
TIMER
UVLO
SHOT
ONE-
STEP-DOWN
CONVERTER
CONTROL
GND
CONTROL
CONTROL
IN1
LDO1
RESET
LDO2
fixed frequency up to 4MHz, allowing for ultra-small
external components. The step-down converter output
current is guaranteed up to 500mA.
When the step-down converter output voltage falls
below the regulation threshold, the error comparator
begins a switching cycle by turning the high-side pFET
switch on. This switch remains on until the minimum on-
time (t
tion or the current-limit threshold (I
Once off, the high-side switch remains off until the mini-
mum off-time (t
again falls below the regulation threshold. During this
off period, the low-side synchronous rectifier turns on
and remains on until either the high-side switch turns
on or the inductor current reduces to the rectifier-off
current threshold (I
synchronous rectifier eliminates the need for an exter-
nal Schottky diode.
nFET
pFET
0.6V
ON
IN2
RESET
OUT1
OUT2
EN2
) expires and the output voltage is in regula-
LX
FB
OFF
LXOFF
) expires and the output voltage
V
C
C
IN
OUT1
IN
EN2
R1
R2
C
OUT2
C
FF
= 30mA (typ)). The internal
L
OUT2
R
RESET
PU
OUT1
OUT3
LIM3P
C
OUT3
) is exceeded.