MAX8660ETL(2006) View Datasheet(PDF) - Maxim Integrated

Part Name

Description

MFG CO.

MAX8660ETL
(Rev.:2006)

High-Efficiency, Low-IQ, PMICs with Dynamic Voltage Management for Mobile Applications

Maxim Integrated 

High-Efficiency, Low-IQ, PMICs with Dynamic

Voltage Management for Mobile Applications

Pin Description (continued)

NAME

PIN

MAX8660 MAX8661

FUNCTION

19 AGND

AGND Analog Ground. Connect PG1, PG2, PG3, PG4, and AGND together. Refer to the MAX8660 EV kit

data sheet for more information.

20

V8

REG8 Always-On 3.3V LDO Output. REG8 is the first regulator that powers up in the

V8

MAX8660/MAX8661. REG8 is supplied from IN and supplies up to 30mA. V8 is internally pulled to

AGND through 1.5kΩ during IN undervoltage or overvoltage lockout. Connect V8 to VCC_BBATT on

Intel XScale processors.

21 LBF

Low-Battery Detect Falling Input. The LBF threshold is 1.20V. Connect LBF to LBR for 50mV

LBF hysteresis. Use a three-resistor voltage-divider for larger hysteresis. LBF sets the falling voltage at

which LBO goes low. See the Low-Battery Detector (LBO, LBF, LBR) section for more information.

22 LBR

23

MR

Low-Battery Detect Rising Input. The LBR threshold is 1.25V. Connect LBF to LBR for 50mV hysteresis.

LBR Use a three-resistor voltage-divider for larger hysteresis. LBR sets the rising voltage at which LBO

goes high. See the Low-Battery Detector (LBO, LBF, LBR) section for more information.

MR

Manual Reset Input. A low MR input causes RSO to go low and resets all serial programmed registers

to their default values. See the Reset Output (RSO) and MR Input section for more information.

24 RAMP

RAMP Ramp-Rate Input. Connect a resistor from RAMP to AGND to set the regulator ramp rates. See the

Ramp-Rate Control (RAMP) section for more information.

25 EN5

REG5 Enable Input. Drive EN5 high to turn on REG5. EN5 has hysteresis so an RC can be used to

EN5 implement manual sequencing with respect to other inputs. EN5 is typically driven by the SYS_EN

output of an Intel XScale processor.

26 PG3

PG3

REG3 Power Ground. Connect PG1, PG2, PG3, PG4, and AGND together. Refer to the MAX8660 EV kit

data sheet for more information.

27 LX3

LX3 REG3 Switching Node. Connect LX3 to the REG3 inductor. LX3 is high impedance when REG3 is shut down.

28 PV3

29 RSO

30

V3

PV3

RSO

V3

REG3 Power Input. Connect a 4.7μF ceramic capacitor from PV3 to PG3. All PV pins and IN must be

connected together externally.

Open-Drain Reset Output. RSO typically connects to the nRESET input on an Intel XScale processor.

An output low from the MAX8660/MAX8661 RSO resets all serial programmed registers to their default

values and causes the processor to enter its reset state. See the Reset Output (RSO) and MR Input

section for more information.

REG3 Voltage Sense Input. Connect V3 directly to the REG3 output voltage. The output voltage

defaults to 1.4V and is adjustable from 0.725V to 1.8V through the serial interface. V3 is internally pulled to

AGND through 550Ω when REG3 is shut down. V3 connects to VCC_APPS on Intel XScale processors.

31 EN34

EN34

REG3 and REG4 Active-High Hardware Enable Input. Drive EN34 high to enable both REG3 and

REG4. Drive EN34 low to allow the serial interface to enable REG3 and REG4 independently. EN34

has hysteresis so an RC can be used to implement manual sequencing with respect to other inputs.

EN34 is typically driven by the PWR_EN output of an Intel XScale processor. See the REG3/REG4

Enable (EN34, EN3, EN4) section for more information.

32 EN2

REG2 Enable Input. Drive EN2 high to turn on REG2. EN2 has hysteresis so that an RC can be used to

EN2 implement manual sequencing with respect to other inputs. EN2 is typically driven by the SYS_EN

output of an Intel XScale processor.

33 SRAD

SRAD

Serial-Address Input. Connect SRAD to AGND for a 7-bit slave address of 0110 100 (0x68). Connect

SRAD to IN to change the address to 0110 101 (0x6A). The eighth slave address bit is always zero

since the MAX8660/MAX8661 are write-only. See the Slave Address section for more information.

PG1

34

—

—

GND

REG1 Power Ground. Connect PG1, PG2, PG3, PG4, and AGND together. Refer to the MAX8660 EV kit

data sheet for more information.

Ground. Connect all GND pins to EP.

20 ______________________________________________________________________________________

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