MAX8819BETI+T Maxim Integrated Products, MAX8819BETI+T Datasheet - Page 22

• Manufacturer Part Number: MAX8819BETI+T
• Description: IC PMIC W/INT CHARGER 28-TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX8819BETI+T

• Applications: Handheld/Mobile Devices
• Voltage - Supply: 2.6 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

PMIC with Integrated Chargers and Smart
Power Selector in a 4mm x 4mm TQFN
The peak-to-peak inductor ripple current during PWM
operation is calculated as follows:
where f
The peak inductor current during PWM operation is cal-
culated as follows:
Figure 5a. MAX8819A/MAX8819B Enable/Disable Logic
22
______________________________________________________________________________________
EN123
S
SYS
EN4
DC
is the 2MHz switching frequency.
I
P P
−
500mV HYST.
400mV HYST.
4.0V RISING
100mV HYST.
I
6.0V RISING
L PEAK
2.5V RISING
=
_
DIE TEMP
V
+165°C
OUT
V
SYS
(
=
V
SYS
I
LOAD
+
-
-
+
×
+
+
-
-
f
S
−
×
V
+
OUT
L
64 CYCLE
DELAY
(32µs)
I
2MHz
BIAS
AND
P P
DCUVLO
OSC
DCOVLO
REF
SYSOK
DT165
2
−
)
READY
REGON
READY
DCPOK
The maximum regulated output current from a step-down
converter is ultimately determined by the p-channel peak
current limit (I
For example, if V
L = 4.7μH, and I
I
then I
P-P
= 3V x (5.3V - 3V)/(5.3V x 2MHz x 4.7μH) = 0.138A
Step-Down Converter Maximum Output Current
OUT_MAX
REGON
PK
= 0.6A - (0.138A/2) = 0.531A.
I
). The calculation follows:
OUT_MAX
PK
SYS
MAX8819A
MAX8819B
= 0.6A:
EN
EN
EN
EN
SOFT-START
SOFT-START
SOFT-START
SOFT-START
= 5.3V, V
REG2
REG4
REG1
REG3
= I
PK
OK
OK
OK
OK
– (I
OUT
P-P
REG1OK
REG2OK
= 3V, f
REG3OK
REG4OK
/2)
S
= 2MHz,