MAX1798AEUP-MAX1799AEUP-MAX1799EUP Fast Delivery |IC PHOENIX CO.,LIMITED

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MAX1798AEUP-MAX1799AEUP-MAX1799EUP
CDMA Cellular/PCS System Power Supplies
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 I2C™-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 QFN
exposed pad (EP) packages. Evaluation kits in TSSOP
(MAX1798EVKIT and MAX1799EVKIT) are available to
facilitate designs.
FeaturesOne 300mA Low-Noise LDOFour 150mA Low-Noise LDOs45µVRMSNoise from 10Hz to 100kHz>60dB Crosstalk Isolation Below 10kHz>60dB PSRR Below 10kHz125mV (max) Dropout (OUT1 at 200mA)100mV (max) Dropout (OUT2–5 at 100mA)Programmable Output Voltages
1.8V to 3.3V in 32 Steps140ms (min) Reset TimerSPI- or I2C-Compatible Serial Interface Push-On/Push-Off Control LogicTwo 150mA General Purpose Open-Drain OutputsOvercurrent and Thermal Protection (all LDOs)1µA Shutdown Current20-Pin Thermally-Enhanced TSSOP or QFN
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
Typical Operating Circuit
Ordering Information
MAX1798/MAX1798A/MAX1799/MAX1799A
CDMA Cellular/PCS System
Power Supplies
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VIN1= VIN2/3= VIN4/5= VSCLK (SCK)= VDIN (SDA)= VCS(AS)= VOFF= 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,= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +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, ONto GND...................................-0.3V to +6V
RSO, ONO to GND.................................-0.3V to (VOUT1+ 0.3V)
PGND to GND.....................................................................±0.3V
OUT1, CS(AS) to GND..............................-0.3V to (VIN1+ 0.3V)
OUT2, OUT3 to GND...............................-0.3V to (VIN2/3+ 0.3V)
OUT4, OUT5 to GND...............................-0.3V to (VIN4/5+ 0.3V)
Continuous Sink Current
DR1, DR2...............................................................100mARMS
RSO................................................................................25mA
Continuous Power Dissipation (TA= +70°C)
20-Pin QFN (derate 20mW/°C above +70°C).................1.6W
20-Pin TSSOP (derate 26mW/°C above +70°C).............2.1W
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
MAX1798/MAX1798A/MAX1799/MAX1799A
CDMA Cellular/PCS System
Power Supplies
ELECTRICAL CHARACTERISTICS (continued)
(VIN1= VIN2/3= VIN4/5= VSCLK (SCK)= VDIN (SDA)= VCS(AS)= VOFF= 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,= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
MAX1798/MAX1798A/MAX1799/MAX1799A
CDMA Cellular/PCS System
Power Supplies
ELECTRICAL CHARACTERISTICS (continued)
(VIN1= VIN2/3= VIN4/5= VSCLK (SCK)= VDIN (SDA)= VCS(AS)= VOFF= 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,= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
MAX1798/MAX1798A/MAX1799/MAX1799A
CDMA Cellular/PCS System
Power Supplies
ELECTRICAL CHARACTERISTICS
(VIN1= VIN2/3= VIN4/5= VSCLK (SCK)= VDIN (SDA)= VCS(AS)= VOFF= 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,= -40°C to +85°C,unless otherwise noted.) (Note 2)
CDMA Cellular/PCS System
Power Supplies
ELECTRICAL CHARACTERISTICS (continued)
(VIN1= VIN2/3= VIN4/5= VSCLK (SCK)= VDIN (SDA)= VCS(AS)= VOFF= 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,= -40°C to +85°C,unless otherwise noted.) (Note 2)
MAX1798/MAX1798A/MAX1799/MAX1799A
MAX1798/MAX1798A/MAX1799/MAX1799A
CDMA Cellular/PCS System
Power Supplies
Note 1:The dropout voltage is defined as (VIN- VOUT) when VOUTis 100mV below the value of VOUTfor VIN= VOUT+ 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 EGP (QFN) package.
ELECTRICAL CHARACTERISTICS (continued)
(VIN1= VIN2/3= VIN4/5= VSCLK (SCK)= VDIN (SDA)= VCS(AS)= VOFF= 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,= -40°C to +85°C,unless otherwise noted.) (Note 2)
Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
MAX1798/MAX1798A/MAX1799/MAX1799A
CDMA Cellular/PCS System
Power Supplies 101001000
OUTPUT NOISE vs. LOAD CURRENT
MAX1798/99-10
LOAD CURRENT (mA)
OUTPUT NOISE (
RMS
100µs/div
OUTPUT NOISE
MAX1798/99-11
VOUT, 50µV/div
CHANNEL-TO-CHANNEL ISOLATION
vs. FREQUENCY
MAX1798/99-12
FREQUENCY (kHz)
CHANNEL-TO-CHANNEL ISOLATION (dB)
GROUND-PIN CURRENT (OUT1)
vs. LOAD CURRENT
MAX1798/99-04
LOAD CURRENT (mA)
GROUND-PIN CURRENT (
GROUND-PIN CURRENT (OUT1)
vs. SUPPLY VOLTAGE (VIN1)
MAX1798/99-05
SUPPLY VOLTAGE (V)
GROUND-PIN CURRENT (
GROUND-PIN CURRENT (OUT1)
vs. TEMPERATURE
MAX1798/99-06
TEMPERATURE (°C)
GROUND-PIN CURRENT (
DROPOUT VOLTAGE (OUT1)
vs. LOAD CURRENT
MAX1798/99-07
LOAD CURRENT (mA)
DROPOUT VOLTAGE (mV)
DROPOUT VOLTAGE (OUT2–5)
vs. LOAD CURRENT
MAX1798/99-08
LOAD CURRENT (mA)
DROPOUT VOLTAGE (mV)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX1798/99-09
FREQUENCY (kHz)
PSRR (dB)ypical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
MAX1798/MAX1798A/MAX1799/MAX1799A
CDMA Cellular/PCS System
Power Supplies
20µs/div
LINE-TRANSIENT RESPONSE
MAX1798/99-13
OUT
AC-COUPLED10mV/div
500mV/div
2µs/div
LOAD-TRANSIENT RESPONSE
MAX1798/99-14
OUT1
AC-COUPLED50mV/div
ILOAD100mA/div
2µs/div
LOAD-TRANSIENT RESPONSE
(NEAR DROPOUT)
MAX1798/99-15
OUT1
AC-COUPLED50mV/div
ILOAD100mA/div
10ms/div
ENTERING SHUTDOWN
MAX1798/99-16
VOUT1
1V/div
OFF
2V/div
40ms/div
STARTUP
MAX1798/99-17
VOUT
2V/div
2V/div
RSO
2V/div
TSSOP SAFE OPERATING AREA
(POWER DISSIPATION LIMIT)
MAX1798/99-18
INPUT VOLTAGE (V)
MAXIMUM OUTPUT CURRENT (mA)
Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
MAX1798/MAX1798A/MAX1799/MAX1799A
CDMA Cellular/PCS System
Power Supplies
Pin Description

Partno	Mfg	Dc	Qty	Available	Descript
MAX1798AEUP	MAXIM	N/a	100	avai	CDMA Cellular/PCS System Power Supplies
MAX1799AEUP	MAXIM	N/a	50	avai	CDMA Cellular/PCS System Power Supplies
MAX1799EUP	MAXIM	N/a	1275	avai	CDMA Cellular/PCS System Power Supplies