Samsung RL37Lx Instrukcja Użytkownika Pobierz pdf (Strona 32)

Confidential MAX8698C, Rev08

Page 32/47

DO NOT COPY. DO NOT DISTRIBUTE 12/8/2009

MR/

nRESET

80ms

Manual reset signal

> 87% Regulation

of VLDO9

PWRHOLD

From AP S3C64xx

Automatic Power Up

Disregard PWRON during Automatic power up.

LDO2

LDO4, LDO7

Turn on by I2C

BUCK1, BUCK2, LDO3, BUCK3,

LDO9,LDO5, LDO6, LDO8

Default ON

60ms

I2C Enabled

I2C Disabled

320ms

Power Down Sequence

Within 640ms, PWRHOLD signal must be pulled

High. If not, Max8698C will be shut down.

Normal Operation

80us

<Figure 8>; timing diagram of automatic power up caused by MR/>

Internal Off-Discharge Resistors

Each regulator on the MAX8698C has an internal resistor that discharges the output capacitor when the

regulator is off (Table 5). The internal discharge resistors pull their respective output to ground when the

regulator is off, ensuring that load circuitry always powers down completely. The internal off-discharge resistors

are active when a regulator is disabled, and when the device is in UVLO with V

greater than 1.0V. With V

less than 1.0V the internal off-discharge resistors may not activate.

Table 5. Internal Off-Discharge Resistor Values

Regulator

Internal Off-Discharge

Resistor Value

BUCK1 1k Ω ±30%

BUCK2 1k Ω ±30%

BUCK3 1k Ω ±30%

LDO2/3/4/5/6/7/8/9 1k Ω ±30%

Thermal Overload Protection

Thermal overload protection limits total power dissipation in the MAX8698C. When internal thermal sensors

detect a die temperature in excess of +160°C, the corresponding regulator(s) are shut down, allowing the IC to

cool. The regulators turn on again after the junction cools by 15°C, resulting in a pulsed output during

continuous thermal-overload conditions.

A thermal overload on any of BUCK1 through BUCK2 only shuts down the overloaded regulator. During thermal

overload, Backup Charger and LDO1 are not turned off, and the I

C interface and voltage monitors remain

active.

External Components

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