MAX8671XETL+ Maxim Integrated Products, MAX8671XETL+ Datasheet - Page 34

• Manufacturer Part Number: MAX8671XETL+
• Description: IC PMIC W/CHARGER 40-TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX8671XETL+

• Function: Charge Management
• Battery Type: Lithium-Ion (Li-Ion), Lithium-Polymer (Li-Pol)
• Voltage - Supply: 4.1 V ~ 6.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 40-WFQFN Exposed Pad
• Mounting Style: SMD/SMT
• Input Voltage: 2.6 V to 6.6 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Output Current: 0.5 A
• Output Voltage: 0.6 V to 5 V
• Supply Current: 0.285 mA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
Choose the step-down regulator inductance to be
4.7µH. The minimum recommended saturation current
requirement is 600mA. In PWM mode, the peak induc-
tor currents are equal to the load current plus one half
of the inductor ripple current. The MAX8671X works
well with physically small inductors. See Table 6 for
suggested inductors.
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:
The three MAX8671X step-down regulators each pro-
vide at least 425mA of output current when using a rec-
ommended inductor (Table 6). To calculate the
maximum output current for a particular application and
inductor use the following two-step process (as shown
in Figure 10):
1) Use the following equation to calculate the approxi-
Table 6. Suggested Inductors
34
MANUFACTURER
mate duty cycle (D):
______________________________________________________________________________________
Taiyo Yuden
S
Sumida
TOKO
TDK
is the 2MHz switching frequency.
D
I
P P
Step-Down Converter Output Current
−
=
I
L PEAK
_
V
=
OUT
V
IN
V
OUT
+
CDRH2D11HP
+
I
V
OUTTAR
=
I
SYS
CDH2D09
OUTTAR
DE2812C
DE2810C
(
VLF3012
VLF3010
I
SERIES
NR3012
NR3010
LOAD
V
SYS
×
f
S
−
(
+
R
×
(
V
Step-Down Inductor
R
I
N
P P
OUT
L
N
2
−
−
+
R
R
)
P
L
)
INDUCTANCE
)
(µH)
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
ESR (Ω)
190
218
130
190
160
240
130
180
2) Use the following equation to calculate the maximum
where:
V
I
be more than the minimum p-channel current-limit
threshold
R
R
R
V
output current (I
where:
I
V
D = approximate duty cycle derived from step 1
f = oscillator frequency—MINIMUM
L = external inductor’s inductance—MINIMUM
R
R
LIM
OUTTAR
OUT
IN
OUT
N
P
L
N
L
= external inductor’s ESR
= external inductor’s ESR
= p-channel on-resistance
= n-channel on-resistance
= n-channel on-resistance
= input voltage—MAXIMUM
= p-channel current-limit threshold—MINIMUM
= output voltage
= output voltage
CURRENT RATING
I
= target (desired) output current—cannot
OUTMAX
(mA)
750
700
770
750
740
700
880
640
OUTMAX
=
1
I
+
LIM
(
R
):
N
−
+
V
3.0 x 3.0 x 1.2 = 10.8mm
3.0 x 3.0 x 1.2 = 10.8mm
3.0 x 2.8 x 1.2 = 10.8mm
OUT
R
3.0 x 3.0 x 1.0 = 9.0mm
3.0 x 3.0 x 1.0 = 9.0mm
2.8 x 2.6 x 1.2 = 8.7mm
2.8 x 2.6 x 1.0 = 7.3mm
3.0 x 2.8 x 1.0 = 8.4mm
2
L
DIMENSIONS (mm)
× ×
)
2
f L
(
1
1
× ×
−
−
f L
D
D
)
3
3
3
3
3
3
3
3