datasheet4u.com

900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1798 Datasheet

CDMA Cellular/PCS System Power Supplies

No Preview Available !

MAX1798 pdf
19-1655; Rev 1; 2/01
EVALUAATVIOANILKAIBTLMEANUAL
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.
Typical Operating Circuit
2.5V
TO 5.5V
SPI OR I2C
0.01µF
IN4/5
IN2/3
IN1
MAX1798
ON MAX1798A*
MAX1799
MAX1799A*
CS (AS)
SCLK (SCK)
DIN (SDA)
BP
ONO
OFF
OUT1
RSO
OUT2
OUT3
OUT4
OUT5
DR1
GND PGND
DR2
IRQ
WDOUT
VCC
RESET
TX
RX
BBA
AUDIO OR
PLL + VCO
VIN1
VIBRATOR
Features
o One 300mA Low-Noise LDO
o Four 150mA Low-Noise LDOs
o 45µVRMS 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 I2C-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 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
Ordering Information
PART
TEMP
RANGE
PIN-
PACKAGE
INTER-
FACE
MAX1798EGP
MAX1798EUP
MAX1798AEGP
MAX1798AEUP
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
20 QFN
20 TSSOP-EP
20 QFN
20 TSSOP-EP
SPI
SPI
SPI
SPI
Ordering Information continued and Pin Configurations
appear at end of data sheet.
BACKLIGHT
( ) ARE FOR MAX1799/MAX1799A.
*-13% RESET THRESHOLD AND SHUTDOWN RESET TIMER ADDED.
SPI is a trademark of Motorola, Inc.
I2C is a trademark of Philips Corp.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1798 Datasheet

CDMA Cellular/PCS System Power Supplies

No Preview Available !

MAX1798 pdf
CDMA Cellular/PCS System
Power Supplies
ABSOLUTE MAXIMUM RATINGS
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 (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
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.
ELECTRICAL CHARACTERISTICS
(VIN1 = VIN2/3 = VIN4/5 = VSCLK (SCK) = VDIN (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; OUT15 set to 2.98V,
TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
IN1, IN2/3, IN4/5 Operating
Voltage
2.5 5.5 V
Undervoltage Lockout IN1
Undervoltage Lockout IN2/3
Undervoltage Lockout IN4/5
Power-On Reset Threshold
Supply Current in Shutdown
Supply Current (Standby)
Supply Current (All Outputs On)
BP Voltage
BP Supply Rejection
OUT1 REGULATOR
Output Accuracy
Output Accuracy
(Line and Load)
VUVLO-1
VUVLO-2/3
VUVLO-4/5
ISHDN
ION
IN1 rising edge
IN2/3 rising edge
IN4/5 rising edge
IN1 falling edge
OFF = 0, ON = IN1
OUT1 ON, other regulators OFF IOUT1 = 0
All regulators ON, IOUT_ = 0
IBP 1nA
2.5V VIN1 5.5V
IOUT1 = 70mA (Note 3)
1mA IOUT1 300mA,
2.5V VIN1 5.5V, VOUT1 = 1.8V (Note 3)
2.10
2.10
2.10
0.9
1.231
2.30
2.30
2.30
1
113
367
1.250
0.2
2.45
2.45
2.45
2.1
10
230
680
1.269
5
V
V
V
V
µA
µA
µA
V
mV
-2 2 %
-3 3 %
Nominal Voltage Adjust Range
Dropout Voltage
Load Regulation
Line Regulation
Current Limit
32 steps through serial interface; Tables 2, 3
IOUT1 = 1mA (Notes 1, 3)
IOUT1 = 200mA (Notes 1, 3)
0.1mA IOUT1 300mA
2.5V VIN1 5.5V, VOUT1 = 1.8V (Note 3)
1.8
-0.15
320
1
73
-0.003
-0.03
500
3.3
125
0.11
850
V
mV
%/mA
%/V
mA
Output-Discharge Switch
Resistance in Shutdown
Regulator output turned off
25 300
OUT1 Reset Threshold
Output Voltage Noise
OUT1 rising and
falling
(MAX1798/MAX1799) -9.5 -7.5 -5.5
(MAX1798A/MAX1799A) -15 -13 -11
%
f = 10Hz to 100kHz, COUT = 4.7µF
45 µVRMS
2 _______________________________________________________________________________________


Part Number MAX1798
Description CDMA Cellular/PCS System Power Supplies
Maker Maxim
Total Page 20 Pages
PDF Download
MAX1798 pdf
MAX1798 Datasheet PDF
[partsNo] view html
View PDF for Mobile








Similar Datasheet

1 MAX1790 Low-Noise Step-Up DC-DC Converters Maxim Integrated Products
Maxim Integrated Products
MAX1790 pdf
2 MAX1791 High-Efficiency / 10-Pin MAX / Step-Down Controllers for Notebooks Maxim
Maxim
MAX1791 pdf
3 MAX1792 500mA Low-Dropout Linear Regulator in MAX Maxim
Maxim
MAX1792 pdf
4 MAX1793 Low-Dropout / Low IQ / 1A Linear Regulator Maxim
Maxim
MAX1793 pdf
5 MAX1795 Low Supply Current / Step-Up DC-DC Converters with True-Shutdown Maxim
Maxim
MAX1795 pdf
6 MAX1796 Low Supply Current / Step-Up DC-DC Converters with True-Shutdown Maxim
Maxim
MAX1796 pdf
7 MAX1797 Low Supply Current / Step-Up DC-DC Converters with True-Shutdown Maxim
Maxim
MAX1797 pdf
8 MAX1798 CDMA Cellular/PCS System Power Supplies Maxim
Maxim
MAX1798 pdf
9 MAX1799 CDMA Cellular/PCS System Power Supplies Maxim
Maxim
MAX1799 pdf





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy