MAX1798EGP+;MAX1798EGP+T;中文规格书,Datasheet资料

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General Description

The MAX1798/MAX1798A/MAX1799/MAX1799A system power supplies are designed specifically for CDMA cel-lular/PCS handsets. Each device contains five low-dropout linear regulators (LDOs), a 140ms (min) reset timer, a serial interface, push-on/push-off control logic,and two general-purpose open-drain outputs. Only the serial interface is different between the MAX1798/MAX1798A/MAX1799/MAX1799A: the MAX1798/MAX1798A feature an SPI?-compatible serial interface,and the MAX1799/MAX1799A feature an I 2C-compati-ble interface. The “A” parts have a -13% reset thresh-old, the non-A parts have a 9.5% threshold. The “A”parts have a 175 delay on a reset-triggered shutdown,the non-A shutdown instantly.

Each linear regulator features extremely low dropout voltage, specified at two-thirds of the maximum output current. LDO1 is rated for 300mA, while LDOs 2–5 are each rated for 150mA. All LDOs are optimized for low noise and isolation. Each LDO can be individually enabled and disabled through the serial port, as well as individually programmed to any of 32 voltages from 1.8V to 3.3V.

The MAX1798/MAX1798A/MAX1799/MAX1799As’wide 2.5V to 5.5V input voltage range makes them compati-ble with a wide range of input supplies, including a sin-gle lithium-ion (Li+) cell battery. Both devices are available in thermally-enhanced 20-pin TSSOP and TQF N exposed pad (EP) packages. Evaluation kits in TSSOP (MAX1798EVKIT and MAX1799EVKIT) are avail-able to facilitate designs.

Features

o One 300mA Low-Noise LDO o Four 150mA Low-Noise LDOs o 45μV RMS Noise from 10Hz to 100kHz o >60dB Crosstalk Isolation Below 10kHz o >60dB PSRR Below 10kHz

o 125mV (max) Dropout (OUT1 at 200mA)o 100mV (max) Dropout (OUT2–5 at 100mA)o Programmable Output Voltages

1.8V to 3.3V in 32 Steps o 140ms (min) Reset Timer

o SPI- or I 2C-Compatible Serial Interface o Push-On/Push-Off Control Logic

o Two 150mA General Purpose Open-Drain Outputs o Overcurrent and Thermal Protection (all LDOs)o 1μA Shutdown Current

o 20-Pin Thermally-Enhanced TSSOP or TQFN Packages

Applications

CDMA Cellular/PCS Handsets

PDAs, Palmtops, and Handy-Terminals Single-Cell Li+ Systems

2- or 3-Cell NiMH, NiCd, or Alkaline Systems

MAX1798/MAX1798A/MAX1799/MAX1799A

CDMA Cellular/PCS System

Power Supplies

________________________________________________________________Maxim Integrated Products

SPI is a trademark of Motorola, Inc.

Ordering Information continued and Pin Configurations appear at end of data sheet.

Typical Operating Circuit

Ordering Information

+Denotes a lead(Pb)-free/RoHS-compliant package.*EP = Exposed pad.

M A X 1798/M A X 1798A /M A X 1799/M A X 1799A

CDMA Cellular/PCS System Power Supplies 2_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

-ELECTRICAL CHARACTERISTICS

(V IN1= V IN2/3= V IN4/5= V SCLK (SCK)= V DIN (SDA)= V CS (AS)= V OFF = 3.6V; ON = GND = PGND = 0; RSO, ONO, DR1, DR2 =open; BP bypassed with 0.01μF, OUT1 bypassed with 4.7μF; OUT2, OUT3, OUT4, OUT5 bypassed with 2.2μF; OUT1–5 set to 2.98V,T A = 0°C to +85°C , unless otherwise noted. Typical values are at T A = +25°C.)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

OFF , DR1, DR2 to GND............................................-0.3V to +6V IN1, IN2/3, IN4/5, DIN (SDA) to GND.......................-0.3V to +6V SCLK (SCK), BP, ON to GND...................................-0.3V to +6V RSO , ONO to GND.................................-0.3V to (V OUT1+ 0.3V)PGND to GND.....................................................................±0.3V OUT1, CS (AS) to GND..............................-0.3V to (V IN1+ 0.3V)OUT2, OUT3 to GND...............................-0.3V to (V IN2/3+ 0.3V)OUT4, OUT5 to GND...............................-0.3V to (V IN4/5+ 0.3V)Continuous Sink Current

DR1, DR2...............................................................100mA RMS

RSO ................................................................................25mA Continuous Power Dissipation (T A = +70°C)

20-Pin TQFN (derate 33.8mW/°C above +70°C)...............2W 20-Pin TSSOP (derate 37.7mW/°C above +70°C).............2W Operating Temperature Range ...........................-40°C to +85°C Junction Temperature......................................................+150°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10s).................................+300°C Soldering Temperature (reflow).......................................+260°C

ELECTRICAL CHARACTERISTICS (continued)

MAX1798/MAX1798A/MAX1799/MAX1799A CDMA Cellular/PCS System Power Supplies (V IN1= V IN2/3= V IN4/5= V SCLK (SCK)= V DIN (SDA)= V CS(AS)= V OFF= 3.6V; ON= GND = PGND = 0; RSO, ONO, DR1, DR2 = open; BP bypassed with 0.01μF, OUT1 bypassed with 4.7μF; OUT2, OUT3, OUT4, OUT5 bypassed with 2.2μF; OUT1–5 set to 2.98V,

T A= 0°C to +85°C, unless otherwise noted. Typical values are at T A= +25°C.)

M A X 1798/M A X 1798A /M A X 1799/M A X 1799A

CDMA Cellular/PCS System Power Supplies 4_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

ELECTRICAL CHARACTERISTICS

T A= -40°C to +85°C,unless otherwise noted.) (Note 2)

CDMA Cellular/PCS System Power Supplies 6_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(V IN1= V IN2/3= V IN4/5= V SCLK (SCK)= V DIN (SDA)= V CS (AS)= V OFF = 3.6V; ON = GND = PGND = 0; RSO, ONO, DR1, DR2 =open; BP bypassed with 0.01μF, OUT1 bypassed with 4.7μF; OUT2, OUT3, OUT4, OUT5 bypassed with 2.2μF; OUT1–5 set to 2.98V,T A = -40°C to +85°C ,unless otherwise noted.) (Note 2)

M A X 1798/M A X 1798A /M A X 1799/M A X 1799A

MAX1798/MAX1798A/MAX1799/MAX1799A

CDMA Cellular/PCS System

Power Supplies

_______________________________________________________________________________________7

Note 1:The dropout voltage is defined as (V IN - V OUT ) when V OUT is 100mV below the value of V OUT for V IN = V OUT + 1V.Note 2:Specifications to -40°C are guaranteed by design, not production tested.

Note 3:Specifications are guaranteed by design, not production tested in the ETP (TQFN) packages.

ELECTRICAL CHARACTERISTICS (continued)

(V IN1= V IN2/3= V IN4/5= V SCLK (SCK)= V DIN (SDA)= V CS (AS)= V OFF = 3.6V; ON = GND = PGND = 0; RSO, ONO, DR1, DR2 =open; BP bypassed with 0.01μF, OUT1 bypassed with 4.7μF; OUT2, OUT3, OUT4, OUT5 bypassed with 2.2μF; OUT1–5 set to 2.98V,T A = -40°C to +85°C ,unless otherwise noted.) (Note 2)

OUTPUT VOLTAGE ACCURACY (OUT1)

vs. LOAD CURRENT

-2.0

-1.0-1.50-0.51.51.00.52.00

100

150200250300LOAD CURRENT (mA)A C C U R A C Y (%)

OUTPUT VOLTAGE ACCURACY (OUT2–5)

vs. LOAD CURRENT

-2.0

-1.0-1.50-0.51.51.00.52.00502575100125150LOAD CURRENT (mA)A C C U R A C Y (%)

-2.0

-1.0-1.50-0.51.51.00.52.0

-4010-15356085

OUTPUT VOLTAGE ACCURACY (OUT1)

vs. TEMPERATURE

TEMPERATURE (°C)

A C C U R A C Y (%)

Typical Operating Characteristics

(T A = +25°C, unless otherwise noted.)

M A X 1798/M A X 1798A /M A X 1799/M A X 1799A

CDMA Cellular/PCS System Power Supplies 8_______________________________________________________________________________________

100

1000

OUTPUT NOISE vs. LOAD CURRENT

LOAD CURRENT (mA)

O U

T P U T N O I S E (μV R M S )

600

1020304050100μs/div OUTPUT NOISE

V OUT , 50μV/div

700.1

10100

1000

CHANNEL-TO-CHANNEL ISOLATION

vs. FREQUENCY

FREQUENCY (kHz)

C H A N N E L -T O -C H A N N E L I S O L A T I O N (d B )

102030405060100

130120110140150160170180190

2000

10050150200250300GROUND-PIN CURRENT (OUT1)

vs. LOAD CURRENT

LOAD CURRENT (mA)G R O U N D -P I N C U R R E N T (μA )

100502001503503002504002.0 3.02.5 3.5 4.0 4.5 5.0 5.5GROUND-PIN CURRENT (OUT1) vs. SUPPLY VOLTAGE (V IN1)

SUPPLY VOLTAGE (V)G R O U N D -P I N C U R R E N T (μ

A )

140

160150180170190200-40103560-1585

GROUND-PIN CURRENT (OUT1)

vs. TEMPERATURE

TEMPERATURE (°C)

G R O U N D -P I N C U R R E N T (μA )

05025100751251500

100

150

200

250300

DROPOUT VOLTAGE (OUT1)

vs. LOAD CURRENT

LOAD CURRENT (mA)D R O P O U T V O L T A G E (m V )

25100751251500

100

125

150

DROPOUT VOLTAGE (OUT2–5)

vs. LOAD CURRENT

LOAD CURRENT (mA)

D R O P O U T V O L T A G

E (m V )

0.01

0.1

100

1000

POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY

FREQUENCY (kHz)

Typical Operating Characteristics (continued)

(T A = +25°C, unless otherwise noted.)

MAX1798/MAX1798A/MAX1799/MAX1799A

CDMA Cellular/PCS System

Power Supplies

_______________________________________________________________________________________

20μs/div

LINE-TRANSIENT RESPONSE

O U T A C -C O U P L E D 10m V /d i v

I N 500m V /d i v

2μs/div

LOAD-TRANSIENT RESPONSE

O U T 1A C -

C O U P L E

D 50m V /d i v

L O A D 100m A /d i v V IN1 = 3.5V, V OUT1 = 2.98V

I LOAD = 20mA TO 200mA, OUT2/3/4/5 = OFF

2μs/div

LOAD-TRANSIENT RESPONSE

(NEAR DROPOUT)

O U T 1A C -C O U P L E D 50m V /d i v

L O A D 100m A /d

i v

10ms/div

ENTERING SHUTDOWN

V OUT11V/div

OFF 2V/div I LOAD = 0

40ms/div STARTUP

M A X 1798/99-17

V OUT 2V/div 2V/div RSO 2V/div

TSSOP/TQFN SAFE OPERATING AREA

(POWER DISSIPATION LIMIT)

200

40030060050090080070010002.5

3.5

3.0

4.0

4.5

5.0

5.5

6.0

INPUT VOLTAGE (V)M A X I M U M O U T P U T C U R R E N T (m A )

Typical Operating Characteristics (continued)

(T A = +25°C, unless otherwise noted.)

M A X 1798/M A X 1798A /M A X 1799/M A X 1799A

CDMA Cellular/PCS System Power Supplies

分销商库存信息:

MAXIM

MAX1798EGP+MAX1798EGP+T