19-1655; Rev 2; 5/10
NUAL
KIT MA
ATION
EVALU
BLE
AVAILA
CDMA Cellular/PCS System
Power Supplies
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
2
C-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
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
2
C-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
TQFN exposed pad (EP) packages. Evaluation kits in
TSSOP (MAX1798EVKIT and MAX1799EVKIT) are avail-
able to facilitate designs.
MAX1798/MAX1798A/MAX1799/MAX1799A
Applications
CDMA Cellular/PCS Handsets
PDAs, Palmtops, and Handy-Terminals
Single-Cell Li+ Systems
2- or 3-Cell NiMH, NiCd, or Alkaline Systems
Typical Operating Circuit
ONO
IN4/5
2.5V
TO 5.5V
OFF
IN2/3
OUT1
IN1
RSO
ON
RESET
TX
RX
BBA
AUDIO OR
PLL + VCO
V
IN1
DR1
DR2
GND
PGND
EP
VIBRATOR
WDOUT
V
CC
IRQ
MSM CONTROLLER
Ordering Information
PART
MAX1798E
TP+
MAX1798EUP+
MAX1798A
ETP+
TEMP
RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
20 TQFN
20 TSSOP-EP*
20 TQFN
INTER-
FACE
SPI
SPI
SPI
SPI
MAX1798
MAX1798A*
MAX1799
MAX1799A*
OUT2
OUT3
OUT4
OUT5
CS (AS)
SPI OR I
2
C
SCLK (SCK)
DIN (SDA)
BP
0.01µF
MAX1798AEUP+ -40°C to +85°C
20 TSSOP-EP*
+Denotes
a lead(Pb)-free/RoHS-compliant package.
*EP
= Exposed pad.
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.
1
________________________________________________________________
Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
CDMA Cellular/PCS System
Power Supplies
MAX1798/MAX1798A/MAX1799/MAX1799A
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 (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
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
(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.)
PARAMETER
IN1, IN2/3, IN4/5 Operating
Voltage
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)
Nominal Voltage Adjust Range
Dropout Voltage
Load Regulation
Line Regulation
Current Limit
Output-Discharge Switch
Resistance in Shutdown
OUT1 Reset Threshold
Output Voltage Noise
SYMBOL
CONDITIONS
MIN
2.5
TYP
MAX
5.5
UNITS
V
V
V
V
V
µA
µA
µA
V
mV
%
%
V
mV
%/mA
V
UVLO-1
V
UVLO-2/3
V
UVLO-4/5
I
SHDN
I
ON
IN1 rising edge
IN2/3 rising edge
IN4/5 rising edge
IN1 falling edge
OFF
= 0,
ON
= IN1
OUT1 ON, other regulators OFF I
OUT1
= 0
All regulators ON, I
OUT_
= 0
I
BP
≤
1nA
2.5V
≤
V
IN1
≤
5.5V
I
OUT1
= 70mA (Note 3)
1mA
≤
I
OUT1
≤
300mA,
2.5V
≤
V
IN1
≤
5.5V, V
OUT1
= 1.8V (Note 3)
32 steps through serial interface; Tables 2, 3
I
OUT1
= 1mA (Notes 1, 3)
I
OUT1
= 200mA (Notes 1, 3)
0.1mA
≤
I
OUT1
≤
300mA
2.5V
≤
V
IN1
≤
5.5V, V
OUT1
= 1.8V (Note 3)
2.10
2.10
2.10
0.9
2.30
2.30
2.30
1
113
367
2.45
2.45
2.45
2.1
10
230
680
1.269
5
2
3
3.3
1.231
1.250
0.2
-2
-3
1.8
1
73
-0.003
-0.15
320
-0.03
500
25
-9.5
-15
-7.5
-13
125
0.11
850
300
-5.5
-11
%/V
mA
Ω
%
Regulator output turned off
OUT1 rising and
falling
(MAX1798/MAX1799)
(MAX1798A/MAX1799A)
f = 10Hz to 100kHz, C
OUT
= 4.7µF
45
µV
RMS
2
_______________________________________________________________________________________
CDMA Cellular/PCS System
Power Supplies
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
= 0°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
OUT2–5 REGULATORS
Output Accuracy
Output Accuracy
(Line and Load)
Nominal Voltage Adjust Range
Dropout Voltage
Load Regulation
Line Regulation
Current Limit
Output-Discharge Switch
Resistance
Output Voltage Noise
Reset Timer
Watchdog Timer
OUT1 Shutdown Timer
(MAX1798A/MAX1799A only)
Regulator output turned off
f = 10Hz to 100kHz, C
OUT
= 2.2µF
140
35
175
I
OUT_
= 50mA (Note 3)
1mA
≤
I
OUT_
≤
150mA,
2.5V
≤
V
IN_
≤
5.5V, V
OUT_
= 1.8V (Note 3)
32 steps through serial interface; Tables 2, 3
I
OUT_
= 1mA (Notes 1, 3)
I
OUT_
= 100mA (Notes 1, 3)
1mA
≤
I
OUT_
≤
150mA
2.5V
≤
V
IN_
≤
5.5V, V
OUT_
= 1.8V (Note 3)
-0.15
160
-2
-3
1.8
1
50
-0.005
-0.02
250
110
45
235
60
295
430
110
540
0.11
500
300
100
2
3
3.3
%
%
V
mV
%/mA
%/V
mA
Ω
µV
RMS
ms
ms
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX1798/MAX1798A/MAX1799/MAX1799A
LOGIC AND CONTROL INPUTS (ON,
OFF, RSO,
DIN (SDA), SCLK (SCK),
CS
(AS))
ms
Input Low Level
Input High Level
SDA Output Low Level
(MAX1799 only)
OFF
Pulldown Resistance
ONO Output Low Level
ONO Output High Level
RSO
Output Low Level
RSO
Output High Level
(Internal Pullup Resistor)
RSO
Reset Resistance
DR1, DR2 Output Low Level
DR1, DR2 OFF Current
(Leakage)
THERMAL SHUTDOWN
Threshold
Hysteresis
V
IL
V
IH
I
DIN (SDA)
= 3mA
I
DIN (SDA)
= 6mA
OFF
= 5.5V
I
ONO
= 1mA
I
ONO
= -1mA
I
RSO
= 1mA, V
IN1
= 1V
I
RSO
= 0
RSO
= 2.48V
I
DR1
= I
DR2
= 100mA (Note 3)
I
OFF
V
DR1
= V
DR2
= 5.5V
-1
V
OUT1
-
0.5
9
14
0.2
V
OUT1
-
0.5
80
155
0.05
1.6
0.4
0.4
0.6
360
0.5
V
V
V
kΩ
V
V
0.5
V
V
19
0.5
1
kΩ
V
µA
160
10
°C
°C
_______________________________________________________________________________________
3
CDMA Cellular/PCS System
Power Supplies
MAX1798/MAX1798A/MAX1799/MAX1799A
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
= 0°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Clock Frequency
Bus-Free Time Between START
and STOP
Hold Time Repeated START
Condition
SCK Low Period
SCK High Period
Setup Time Repeated START
Condition
Data Hold Time
Data Setup Time
Maximum Pulse Width of Spikes
that Must Be Suppressed by the
Input Filter of Both SDA and
SCK Signals
Setup Time for STOP Condition
SCLK Clock Frequency
SCLK Low Period
SCLK High Period
Data Hold Time
Data Setup Time
CS
Assertion to SCLK Rising
Edge Setup Time
CS
Deassertion to SCLK Rising
Edge Setup Time
SCLK Rising Edge to
CS
Deassertion
SCLK Rising Edge to
CS
Assertion
CS
High Period
SPI TIMING (MAX1798/MAX1798A)
f
SCLK
t
cl
t
ch
t
HD_DAT
t
SU_DAT
t
CSS
t
CS1
t
CSH
t
CSO
t
CSW
125
125
0
125
200
200
200
200
300
2
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
SYMBOL
SCK
CONDITIONS
MIN
TYP
MAX
400
UNITS
kHz
µs
µs
µs
µs
µs
µs
ns
I
2
C (SMB) TIMING (MAX1799/MAX1799A)
t
BUF
t
HD_STA
t
LOW
t
HIGH
t
SU_STA
t
HD_DAT
t
SU_DAT
t
SP
t
SU_STO
1.3
0.6
1.3
0.6
0.6
0
100
50
ns
0.6
µs
4
_______________________________________________________________________________________
CDMA Cellular/PCS System
Power Supplies
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
= -40°C to +85°C,
unless otherwise noted.) (Note 2)
PARAMETER
IN1, IN2/3, IN4/5 Operating
Voltage
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
OUT1 REGULATOR
Output Accuracy
Output Accuracy
(Line and Load)
Nominal-Voltage Adjust Range
Dropout Voltage
Line Regulation
Current Limit
Output-Discharge Switch
Resistance in Shutdown
OUT1 Reset Threshold
Regulator output turned off
OUT1 rising and
falling
I
OUT_
= 50mA (Note 3)
1mA
≤
I
OUT_
≤
150mA,
2.5V
≤
V
IN_
≤
5.5V, V
OUT_
= 1.8V (Note 3)
32 steps through serial interface; Tables 2, 3
I
OUT_
= 100mA (Notes 1, 3)
2.5V
≤
V
IN_
≤
5.5V, V
OUT_
= 1.8V (Note 3)
-0.15
160
Regulator output turned off
MAX1798/MAX1799
MAX1798A/MAX1799A
-9.5
-15
-2.5
-3.5
1.8
I
SHDN
I
ON
V
UVLO-1
V
UVLO-2/3
V
UVLO-4/5
SYMBOL
(Note 1)
IN1 rising edge
IN2/3 rising edge
IN4/5 rising edge
IN1 falling edge
OFF
= 0,
ON
= IN1
OUT1 ON, other regulators OFF I
OUT1
= 0
All regulators ON, I
OUT_
= 0
I
BP
≤
1nA
I
OUT1
= 70mA (Note 3)
1mA
≤
I
OUT1
≤
300mA,
2.5V
≤
V
IN1
≤
5.5V, V
OUT1
= 1.8V (Note 3)
32 steps through serial interface; Tables 2, 3
I
OUT1
= 200mA (Notes 1, 3)
2.5V
≤
V
IN1
≤
5.5V, V
OUT1
= 1.8V (Note 3)
-0.15
320
1.225
-2.5
-3.5
1.8
CONDITIONS
MIN
2.5
2.10
2.10
2.10
0.9
TYP
MAX
5.5
2.45
2.45
2.45
2.1
10
230
680
1.275
2.5
3.5
3.3
125
0.11
850
300
-5.5
-11
2.5
3.5
3.3
100
0.11
500
300
UNITS
V
V
V
V
V
µA
µA
µA
V
%
%
V
mV
%/V
mA
Ω
%
MAX1798/MAX1798A/MAX1799/MAX1799A
OUT2–5 REGULATORS
Output Accuracy
Output Accuracy
(Line and Load)
Nominal-Voltage Adjust Range
Dropout Voltage
Line Regulation
Current Limit
Output-Discharge Switch
Resistance in Shutdown
%
%
V
mV
%/V
mA
Ω
_______________________________________________________________________________________
5
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