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您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄383336 > MAX1799EGP (MAXIM INTEGRATED PRODUCTS INC) CDMA Cellular/PCS System Power Supplies PDF資料下載

參數(shù)資料

型號(hào)：	MAX1799EGP
廠商：	MAXIM INTEGRATED PRODUCTS INC
元件分類(lèi)：	基準(zhǔn)電壓源/電流源
英文描述：	CDMA Cellular/PCS System Power Supplies
中文描述：	FIVE OUTPUT, ADJUSTABLE POSITIVE LDO REGULATOR, CQCC20
封裝：	5 X 5 MM, 0.90 MM HEIGHT, QFN-20
文件頁(yè)數(shù)：	14/20頁(yè)
文件大小：	642K
代理商：	MAX1799EGP

CDMA Cellular/PCS System

Power Supplies

______________________________________________________________________________________

Hard Shutdown

To shut down the MAX1798/MAX1798A/MAX1799/

MAX1799A, drive

OFF

low or allow the internal resistor

to pull down

OFF

while

is high. The device shuts

down after the watchdog timer has cleared (35ms min,

52ms typ). During shutdown, all LDO outputs and

RSO

are actively pulled to GND, the open-drain drivers are

in a high-impedance state, and the serial port and reset

timer are inactive. Previously programmed output volt-

age data is retained in the internal registers as long as

IN1

> 2.1V. If the device is turned back on by the

button, OUT1 automatically is enabled with the preshut-

down output voltage. OUT2

–

5 automatically return to

their preshutdown voltages once they are enabled

through the serial interface.

Soft Shutdown

The serial port can also be used to shut down the

MAX1798/MAX1798A/MAX1799/MAX1799A. Using the

control data byte to disable OUT1 will shut down the

entire device. Once shut down, the only means to turn

on the device is through a momentary low on the

button.

Control Data Byte

The control data byte is 8 bits long (3 command bits

and 5 data bits). The first 3 bits specify the action to be

taken, while the last 5 bits set the output voltage or

ON/OFF status. Each regulator has an individual DAC

that sets the output voltage. The DAC registers are

double buffered to allow for simultaneous updating of

all outputs. The output voltage is programmed per

Table 2 or Table 3. At power-up, if no specific voltage

is programmed, OUT1

–

5 will be set for 2.98V. All DAC

programming must be shifted from the double buffer to

the DACs with the update DAC command (Table 1,

000XXXXX) for the programmed voltages to be seen at

the LDO outputs. The DACs can be updated one at a

time or all at once after all desired outputs are pro-

grammed. The ON/OFF status of the LDOs and drivers

is not double-buffered and takes immediate effect upon

returning high (SPI compatible) or upon the ninth

rising edge of SCK during the command byte (Figure 2,

edge L). A one turns on the LDO output or driver out-

put, and a zero turns it off.

SPI-Compatible Serial Interface

Use an SPI-compatible 3-wire serial interface with the

MAX1798/MAX1798A to control the ON/OFF state and

output voltage of each regulator, the ON/OFF state of

the drivers, and to shut down the device. Figures 4a

and 4b are timing diagrams for the SPI protocol. The

MAX1798/MAX1798A is a write-only device and uses

along with SCLK and DIN to communicate. The seri-

al port operates when the device is enabled, even when

RSO

is low. The MAX1798/MAX1798A can support a

2MHz (max) data rate. This SPI-compatible port uses

the CPOL = CPHA = 0 protocol.

C-Compatible Serial Interface

Use an I

C-compatible 2-wire serial interface with the

MAX1799/MAX1799A to control the ON/OFF state and

output voltage of each regulator, the ON/OFF state of

the drivers, and to shut down the device. Use standard

C-compatible write-byte commands to program the

IC. Figure 2 is a timing diagram for the I

C protocol.

The MAX1799/MAX1799A is always a slave to the bus

master. The serial port operates when the device is

enabled, even when OUT1 and

RSO

are low. When AS

is high, the address is 0111111. When AS is low, the

address is 1001111. Two MAX1799/MAX1799A devices

can be controlled by a single bus master.

Output Voltage

The MAX1798/MAX1798A/MAX1799/MAX1799A are

supplied with factory-set output voltages. At power-up,

all DACS are set for 2.98V, while only OUT1 is enabled;

all other LDO outputs and drivers are off. OUT2

–

DR1, and DR2 must be enabled on with the serial port.

OUT2

–

5 can be individually programmed through the

serial port from 1.8V to 3.3V in 32 steps, either while on

or off. OUT1 can be programmed in 32 steps from 1.8V

to 3.3V only while on. (If OUT1 is off, the serial port is

also off, and OUT1 cannot be programmed.) If OUT1 is

turned off through the serial port or the

OFF

pin, the

entire chip, including the serial port, will be shut down.

However, all previously programmed DAC settings will

be retained as long as a valid supply voltage is main-

tained on IN1 (V

IN1

> 2.1V).

Current Limit

The MAX1798/MAX1798A/MAX1799/MAX1799A

include current limiting on each LDO output. OUT1 has

a current limit set at 500mA (320mA min), while

OUT2

–

5 have current limits set at 250mA (160mA min).

When the LDO output is in current limit, the current-lim-

iter device monitors and controls the pass transistor

’

gate voltage, limiting the output current available from

the LDO. Once the excessive load is removed, normal

function resumes automatically.

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相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
MAX1799EGP+	功能描述:PMIC 解決方案 RoHS:否制造商:Texas Instruments 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel
MAX1799EGP+T	功能描述:PMIC 解決方案 RoHS:否制造商:Texas Instruments 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel
MAX1799EGP-T	功能描述:PMIC 解決方案 RoHS:否制造商:Texas Instruments 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel
MAX1799ETP+T	制造商:Maxim Integrated Products 功能描述:
MAX1799EUP	功能描述:PMIC 解決方案 RoHS:否制造商:Texas Instruments 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel

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