MIC2829 Datasheet, PDF (33/52 Pages) Micrel Semiconductor – 3G/4G HEDGE/LTE PMIC with Six Buck Converters, Eleven LDOs and SIM Card Level Translation

Micrel Inc.
MIC2829
Application Information
The MIC2829 is a Power Management Integrated Circuit
(PMIC) designed for 3G/4G (HEDGE/LTE or WiMAX)
modules. It incorporates six buck converters, eleven
LDOs and a SIM card level translator in a 5.5mm x
5.5mm package designed to support 3G/4G
(HEDGE/LTE or WiMAX) wireless modems. A typical
power source for the MIC2829 can be from a USB host
or a single cell lithium ion battery.
The MIC2829 has six integrated step-down regulators.
Four of the six integrated step-down converters
incorporate HyperLight Load^TM (HLL) technology. The
DC1, DC2, and DC4 operate at 4MHz switching
frequency range and can support 1A, 300mA and
600mA respectively. DC3 operates at 2.5MHz and can
support up to 600mA.
DC5 and DC6 operate at a 2MHz switching frequency,
can support 100% duty cycle operation and can maintain
800mA on each output. They both have adjustable
output voltages using external resistors.
The MIC2829 has eleven low dropout regulators (LDOs).
Five general purpose LDOs (LDO1 to LDO4, LDO11)
have low dropout, output accuracy of ±3% and drawing
40µA of ground current. The other six are high
performance LNRs (LNR5-LNR10) with a PSRR of over
70dB at 1kHz and 20µVrms Output Noise. The LNRs
require just 20µA to operate.
The MIC2829 also has three level shifters and a 50mA
power supply for digital SIM Card signal translations.
Input Capacitor
The MIC2829 has many input pins that are externally
connected. A 1µF ceramic capacitor or greater should
be placed close to the power input pin and ground. The
following chart indicates the minimum capacitance
needed for each input pin and their ideal grounding
points.
Pin Name
AVIN1
AVIN2
AVIN3
AVIN4
INLDO23
INLDO45
INLDO6
INLDO7
INLDO8
INLDO910
LSPWR
PVIN1
Capacitance
1 µF
1 µF
1 µF
1 µF
1 µF
1 µF
1 µF
1 µF
1 µF
1 µF
1 µF
1 µF
Ideal Ground
AGND1
AGND2
AGND3
AGND4
AGND1 or AGND2
AGND1 or AGND2
AGND1 or AGND2
AGND1 or AGND2
AGND1 or AGND2
AGND1 or AGND2
AGND1 or AGND2
PGND1
Pin Name
PVIN2
PVIN3
PVIN4
PVIN5
PVIN6
Capacitance
1 µF
1 µF
1 µF
1 µF
1 µF
Ideal Ground
PGND2
PGND3
PGND4
PGND5
PGND6
Table 3. Recommended Input Capacitance
A case size 0402, 1µF ceramic capacitor (Samsung
CL05A105KP5NNN) is recommended based upon
performance, size and cost. A X5R or X7R temperature
rating is recommended for the input capacitor. Y5V
temperature rating capacitors, aside from losing most of
their capacitance over temperature, can also become
resistive at high frequencies. This reduces their ability to
filter out high frequency noise.
Output Capacitor
The buck regulators (DC1 to DC6) are designed for use
with a 4.7µF or greater ceramic output capacitor. A case
size 0402, 4.7µF ceramic capacitor (Samsung,
CL05A475MQ5NRN) is recommended based upon
performance, size and cost. A case size 0402, 1µF
ceramic capacitor (Samsung, CL05A105KP5NNN) is
recommended for each LDO (LDO1 to LDO4, LDO11,
and SIMPWR) output. Each LNR (LNR5 to LNR10) is
designed for low noise operation; therefore, a case size
0402, 2.2µF ceramic capacitor (Samsung,
CL05A225MP5NSN) is recommended. Table 4 below
indicates the recommended capacitance needed for
each output and their ideal grounding points.
Output Capacitance Ideal Ground
LDO1
1 µF
AGND1 or AGND2
LDO2
1 µF
AGND1 or AGND2
LDO3
1 µF
AGND1 or AGND2
LDO4
1 µF
AGND1 or AGND2
LDO5
2.2 µF
AGND1 or AGND2
LDO6
2.2 µF
AGND1 or AGND2
LDO7
2.2 µF
AGND1 or AGND2
LDO8
2.2 µF
AGND1 or AGND2
LDO9
2.2 µF
AGND1 or AGND2
LDO10
2.2 µF
AGND1 or AGND2
LDO11
1 µF
AGND1 or AGND2
SIMPWR
1 µF
AGND1 or AGND2
DC1
4.7 µF
PGND1
DC2
4.7 µF
PGND2
DC3
4.7 µF
PGND3
DC4
4.7 µF
PGND4
DC5
4.7 µF
PGND5
DC6
4.7 µF
PGND6
Table 4. Recommended Output Capacitance
May 2010
33
M9999-051410-B