MAX1686HEUA-T Maxim Integrated Products, MAX1686HEUA-T Datasheet - Page 7

• Manufacturer Part Number: MAX1686HEUA-T
• Description: Charge Pumps 3-5V Regulating Chrg Pump For SIM Cards
• Manufacturer: Maxim Integrated Products

Specifications of MAX1686HEUA-T

• Function: Step Up
• Output Voltage: 5 V
• Output Current: 12 mA
• Maximum Operating Temperature: + 85 C
• Package / Case: uMAX-8
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT

mance with different input voltages and an additional
small 0.1µF capacitor at the output. The extra 0.1µF
capacitor improves start-up capability under full load
and reduces output ripple for high input voltages. Table
2 lists the recommended capacitor manufacturers.
Low-ESR capacitors, such as surface-mount ceramics,
decrease noise and give the best efficiency. Capaci-
tance and ESR variation over temperature need to be
taken into consideration for best performance in applica-
tions with large operating temperature ranges.
For applications where the minimum input voltage is 3V
or greater, the flying capacitor, C
to 0.1µF. This provides two benefits: the inrush surge
current at start-up is reduced, and the output ripple
voltage (especially at high input voltages) is also
reduced.
Table 1. Ripple and Efficiency vs. Input
Voltage and Load Current
VOLTAGE
INPUT
(V)
2.7
2.7
3.3
3.3
3.6
3.6
4.2
4.2
CURRENT
LOAD
_______________________________________________________________________________________
(mA)
10
10
10
10
1
1
1
1
V
OUT
(mV)
120
120
30
30
60
60
80
80
RIPPLE
X
, can be decreased
EFFICIENCY
Charge Pumps for SIM Cards
84.3
86.2
69.5
70.5
63.2
63.8
52.3
52.1
(%)
High switching frequencies and large peak currents
make PC board layout an important part of design. All
capacitors should be soldered close to the IC. Con-
nect ground and power ground through a short, low-
impedance trace. Keep the extra copper on the board
and integrate it into ground as a pseudo-ground plane.
On multilayer boards, route the star ground using com-
ponent-side copper fill, then connect it to the internal
ground plane using vias. Ensure that the load is con-
nected directly across the output filter capacitor.
Table 2. Recommended Surface-Mount
Capacitor Manufacturers
TRANSISTOR COUNT: 840
0.047 to 2.2
4.7 to 47
VALUE
1 to 47
1 to10
(µF)
3V to 5V Regulating
DESCRIPTION
X7R ceramic
595D-series
TPS-series
267 series
tantalum
tantalum
tantalum
Layout Considerations
Chip Information
Sprague
Matsuo
MFR.
TDK
AVX
AVX
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