LM10506 datasheet(29/43 Pages) TI2

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LM10506

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SNVS729F – SEPTEMBER 2011 – REVISED AUGUST 2014

Typical Application (continued)

9.2.1 Design Requirements

Table 2. Output Voltage Configurations for LM10506

VOUT if

MAXIMUM

TYPICAL

REGULATOR

H/L=HIGH

H/L=LOW

STANDBY=HIGH

VOUT

OUTPUT

APPLICATIO

COMMENTS

(B2, B3)

(STANDBY MODE)

CURRENT

1.1 V to 3.6 V;

Buck 1(1)

3 V

Off

1.3 A

VCC

Flash

50-mV steps

1.1 V to 3.6 V;

Buck 2(1)

3 V

1.8 V

Off

400 mA

VCCQ

Interface

50-mV steps

0.7 V to 1.335 V;

Buck 3(1)

1.2 V

1 V

VNOM - 7%

600 mA

VCORE

Core

5-mV steps

VHOST

Reference for

LDO

3.2 V

N/A

100 mA

controller

Digital

(1)

Default voltage values are determined when working in PWM mode. Voltage may be 0.8-1.6% higher when in PFM mode.

Table 3. Output Voltage Configurations for LM10506-A

VOUT if

MAXIMUM

TYPICAL

REGULATOR

H/L=HIGH

H/L=LOW

STANDBY=HIGH

VOUT

OUTPUT

APPLICATIO

COMMENTS

(B2, B3)

(STANDBY MODE)

CURRENT

1.1 V to 3.6 V;

Buck 1(1)

3 V

Off

1.3 A

VCC

Flash

50-mV steps

1.1 V to 3.6 V;

Buck 2(1)

2 V

1.8 V

Off

400 mA

VCCQ

Interface

50-mV steps

0.7 V to 1.335 V;

Buck 3(1)

1.2 V

1 V

VNOM - 7%

600 mA

VCORE

Core

5-mV steps

VHOST

Reference for

LDO

3.2 V

N/A

100 mA

controller

Digital

(1)

Default voltage values are determined when working in PWM mode. Voltage may be 0.8-1.6% higher when in PFM mode.

9.2.2 Detailed Design Procedure

9.2.2.1 Input Voltage

VIN, VIN_B1, VIN_B2, and VIN_B3 must all be connected to the same power source.

9.2.2.2 Standby Mode

Ensure that the device is in a low power mode before entering Standby and throughout the Standby phase. In

Standby mode the device is in a low power mode in which all internal clocks are turned off to conserve power

and Buck 3 will only operate in PFM mode. While limited to PFM mode the loading on Buck 3 should be kept

below 80 mA (typ.) to remain below the PFM/PWM threshold and avoid device shutdown.

9.2.2.3 External Components Selection

All three switchers require an input capacitor and an output inductor-capacitor filter. These components are

critical to the performance of the device. All three switchers are internally compensated and do not require

external components to achieve stable operation. The output voltages of the bucks can be programmed through

the SPI pins.

9.2.2.3.1

Output Inductors & Capacitors Selection

There are several design considerations related to the selection of output inductors and capacitors:

•

Load transient response

•

Stability

•

Efficiency

•

Output ripple voltage

•

Overcurrent ruggedness

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