13892 datasheet(82/161 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

13892

FUNCTIONAL DEVICE OPERATION

SUPPLIES

Figure 24. Boost Switcher Efficiency

LINEAR REGULATORS

This section describes the linear regulators provided. For convenience, these regulators are named to indicate their typical or

possible applications, but the supplies are not limited to these uses and may be applied to any loads within the specified regulator

capabilities.

A low power standby mode controlled by STANDBY is provided in which the bias current is aggressively reduced. This mode

is useful for deep sleep operation where certain supplies cannot be disabled, but active regulation can be tolerated with lesser

parametric requirements. The output drive capability and performance are limited in this mode. Refer to STANDBY Event

Definition and Control in Power Control System for more details.

Some dedicated regulators are covered in their related chapters rather than in the Supplies chapter (i.e., the VUSB and VUSB2

supplies are included in Connectivity).

Apart from the integrated linear regulators, there are also GPO output pins provided to enable and disable discrete regulators

or functional blocks, or to use as a general purpose output for any system need. For example, one application may be to enable

a battery pack thermistor bias in synchronization with timed ADC conversions.

All regulators use the main bandgap as the reference. The main bandgap is bypassed with a capacitor at REFCORE. The

bandgap and the rest of the core circuitry is supplied from VCORE. The performance of the regulators is directly dependent on

the performance of VCOREDIG and the bandgap. No external DC loading is allowed on VCOREDIG or REFCORE. VCOREDIG

is kept powered as long as there is a valid supply and/or coin cell. Table 53 captures the main characteristics of the core circuitry.

Table 53. Core Specifications

Reference

Parameter

Target

VCOREDIG (Digital core supply)

Output voltage in ON mode (61),(62)

1.5 V

Output voltage in Off mode(62)

1.2 V

Bypass Capacitor

2.2

μF typ (0.65 μF derated)

VCORE (Analog core supply)

Output voltage in ON mode (61),(62)

2.775 V

Output voltage in Off mode (62)

0 V

Bypass Capacitor

2.2

μF typ (0.65 μF derated)

REFCORE (Bandgap / Regulator Reference)

Output voltage (61)

1.20 V

Absolute Accuracy

0.50%

Temperature Drift

0.25%

Bypass Capacitor

100 nF typ (65 nF derated)

Notes

61.

3.0 V < BP < 4.65 V, no external loading on VCOREDIG, VCORE, or REFCORE. Extended operation down to UVDET, but no system

malfunction.

62.

The core is in On mode when charging or when the state machine of the IC is not in the Off mode nor in the power cut mode. Otherwise,

the core is in Off mode.

5V Boost Efficien cy

(Vin = 3.6V, Vout = 5V)

80.00

85.00

90.00

95.00

100.00

100

200

300

Boost Load Current (m A)

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