MIC2829 datasheet(33/52 Pages) MICREL

33 / 52 page

Micrel Inc.

MIC2829

May 2010

M9999-051410-B

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

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

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

Capacitance

Ideal Ground

AVIN1

1 µF

AGND1

AVIN2

1 µF

AGND2

AVIN3

1 µF

AGND3

AVIN4

1 µF

AGND4

INLDO23

1 µF

AGND1 or AGND2

INLDO45

1 µF

AGND1 or AGND2

INLDO6

1 µF

AGND1 or AGND2

INLDO7

1 µF

AGND1 or AGND2

INLDO8

1 µF

AGND1 or AGND2

INLDO910

1 µF

AGND1 or AGND2

LSPWR

1 µF

AGND1 or AGND2

PVIN1

1 µF

PGND1

Pin Name

Capacitance

Ideal Ground

PVIN2

1 µF

PGND2

PVIN3

1 µF

PGND3

PVIN4

1 µF

PGND4

PVIN5

1 µF

PGND5

PVIN6

1 µF

PGND6

Table 3. Recommended Input Capacitance

A case size 0402, 1µF ceramic capacitor (Samsung

CL05A105KP5NNN)

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)

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

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