Maxim MAX888ECJ, MAX886ECJ Datasheet
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General Description
The MAX886/MAX888 power-management ICs are complete power systems for wireless and satellite handsets.
The devices operate from 3 to 6-cell NiCd/NiMH batteries or from 1 or 2-cell Li-Ion batteries. They incorporate a
high-efficiency, step-down DC-DC converter, a regulated
5V charge pump, and four linear regulators. The regulators supply power to the SIM, LCD, BB, DSP, and RF
sections of a cellular telephone handset. The step-down
converter and linear regulator outputs are adjustable by
internal 4-bit DACs, programmable through the I2C™compatible serial interface. A pushbutton on/off scheme
activates a 5µA low-power shutdown mode. The devices
also feature a low-battery detector output and an internal
start-up timer.
The MAX886/MAX888 differ in output voltage range and
power-on reset voltage. The MAX886 has a higher preset
voltage range and is intended for 2-cell Li-Ion or 5/6-cell
NiCd/NiMH batteries. The MAX888 has a lower preset
voltage range and is intended for 1-cell Li-Ion or 3/4-cell
NiCd/NiMH batteries. Both devices are available in a
space-saving, 32-pin TQFP package.
Applications
Satellite Phones Private Mobile Radio (PMR)
Wireless Handsets GSM Cellular/PCS Telephones
Features
♦ 90% Efficient, 500mA Step-Down Converter
♦ Two 100mA DAC-Controlled LDOs
One 200mA DAC-Controlled LDO
One 20mA DAC-Controlled LDO
♦ 3 to 6-Cell NiCd or NiMH Operation
1 or 2-Cell Li-Ion Operation
♦ +2.7V to +12V Input Voltage Range
♦ 250µA Standby (PFM) Quiescent Current
♦ 5µA Shutdown Current
♦ I2C-Compatible Serial Interface
♦ Selectable 375kHz, 535kHz, 670kHz, 925kHz
(or Synchronizable) Switching Frequency
♦ Power-On Reset and Start-Up Timer
♦ Thermal Overload Protection
♦ Pushbutton On/Off Control
♦ Space-Saving 32-Pin TQFP Package (7mm x 7mm)
MAX886/MAX888
Wireless and Satellite Handset
Power-Management ICs
________________________________________________________________
Maxim Integrated Products
1
BATT
LBO
SCL
SDA
LBI
IN
2.7V TO 12V
I
2
C-COMPATIBLE
SERIAL INTERFACE
LOW-BATTERY
DETECT
ON/OFF CONTROL
(OPTIONAL)
LX
MAIN POWER (UP TO 500mA)
PGND
OUT0
Tx SECTION POWER (UP TO 100mA)
DSP POWER (UP TO 200mA)
3V/5V SIM CARD POWER (UP TO 20mA)
LCD/VCO/TXCO POWER (UP TO 100mA)
POWER-ON RESET
Rx SECTION POWER (UP TO 100mA)
OUT1
MAX886
MAX888
OUT2
RESET
OUT3
OUT4
OUT5
ONSTAT
GND
OFF
SYNC
C+
C-
ON
ON STATUS
19-1438; Rev 0; 3/99
PART
MAX886ECJ*
MAX888ECJ
-40°C to +85°C
-40°C to +85°C
TEMP. RANGE PIN-PACKAGE
32 TQFP
32 TQFP
EVALUATION KIT MANUAL
FOLLOWS DATA SHEET
*
Future product—contact factory for availability.
Typical Operating Circuit
Ordering Information
Pin Configuration appears at end of data sheet.
I
2
C is a trademark of Philips Corp.
MAX886/MAX888
Wireless and Satellite Handset
Power-Management ICs
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
BATT
= V
IN0
= V
IN1
= +5.5V, GND = PGND = DGND, V
OFF
= V
SYNC
= 2.8V, V
IN2
= V
IN3
= V
IN4
= V
IN5
= +3.8V, V
OUT4
= +5.5V,
T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
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.
BATT, IN0, IN1 to GND...........................................-0.3V to +13V
CVH to IN0................................................................-6V to +0.3V
PGND, DGND to GND...........................................-0.3V to +0.3V
ONSTAT to GND.....................................-0.3V to (V
OUT2
+ 0.3V)
LX to PGND.............................................-0.3V to (V
OUT0
+ 0.3V)
OUT1 to GND.............................................-0.3V to (V
IN1
+ 0.3V)
OUT2 to GND.............................................-0.3V to (V
IN2
+ 0.3V)
OUT3 to GND.............................................-0.3V to (V
IN3
+ 0.3V)
OUT5 to GND.............................................-0.3V to (V
IN5
+ 0.3V)
SYNC, RESET, SCL, SDA, CVL, LBI, LBHYS, OUT0
REF, LBO, C+, C-, OUT4, IN2, IN3, IN4, IN5,
ON, OFF to GND ...................................................-0.3V to +6V
Continuous Power Dissipation (T
A
= +70°C)
TQFP (derate 11.1mW/°C above +70°C)......................889mW
Operating Temperature Range. ......................... -40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10sec).............................+300°C
V
OUT0
= 3.75V (MAX886),
V
OUT0
= 2.027V (MAX888)
MAX888
MAX886
I
OUT0
= 0
2.7V < V
OUT0
< 3.75V
f
OSC
= 375kHz
1µA < I
REF
< 100µA
I
REF
= 0
SYNC = GND
V
BATT
falling
V
BATT
rising
CONDITIONS
% of
V
OUT0
Output Ready Threshold -7.5 -5 -3
V
1.527 3.027
V
OUT0
Nominal Output Adjustment
Range
2.625 3.750
%-3 3Output Accuracy
V2.7 12V
IN0
Input Voltage Range
mV0.2 5Reference Supply Rejection
mV515Reference Load Regulation
V
1.225 1.275
V
REF
Reference Output Voltage
1.23 1.25 1.27
V2.7 5.5
V
IN2
, V
IN3
,
V
IN4
, V
IN5
IN2, IN3, IN4, IN5 Operating
Voltage Range
V2.7 12
V
BATT
, V
IN0
,
V
IN1
BATT, IN0, IN1 Operating Voltage
Range
510
2
µA250 600I
BATTPFM
Supply Current, PFM Mode
V2.35 2.45V
UVLOF
V2.55 2.65V
UVLOR
Undervoltage Lockout
UNITSMIN TYP MAXSYMBOLPARAMETER
OFF = GND
µA
15
I
STNBY
Supply Current, Shutdown Mode
TA= 0°C to +85°C
TA= -40°C to +85°C
TA= 0°C to +85°C
TA= -40°C to +85°C
f
OSC
= 535kHz 3
f
OSC
= 670kHz
f
OSC
= 925kHz
mA
5.5 12
I
BATTPWM
Supply Current, PWM Mode
4
REFERENCE
DC-DC BUCK REGULATOR 0 (IN0, OUT0)
MAX886/MAX888
Wireless and Satellite Handset
Power-Management ICs
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
BATT
= V
IN0
= V
IN1
= +5.5V, GND = PGND = DGND, V
OFF
= V
SYNC
= 2.8V, V
IN2
= V
IN3
= V
IN4
= V
IN5
= +3.8V, V
OUT4
= +5.5V,
T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
I
OUT1
= 0.1mA to 100mA
Table 4
I
OUT0
V
IN0
= 3.8V
CONDITIONS
%-3 3Output Accuracy
V2.7 12V
IN1
Input Voltage Range
%
-23 23
f
OSC
Oscillator Frequency Accuracy
-20 20
A0.6 0.9 1.2I
LIMIT
Internal Switch Current Limit
mA63 98 180PFM to PWM Threshold
Ω0.4 1R
ON
Internal Switch On-Resistance
UNITSMIN TYP MAXSYMBOLPARAMETER
V
OUT2
= 3.3V (MAX886),
V
OUT2
= 1.527V (MAX888)
MAX888
MAX886
I
OUT2
= 0.1mA to 200mA
3V < V
IN1
< 12V, 0h code
I
OUT1
= 0.1mA to 100mA
I
OUT1
= 100mA
I
OUT1
= 1mA
MAX888
MAX886
V
1.527 3.027
V
OUT2
Nominal Output Adjustment
Range
2.175 3.30
%-3 3Output Accuracy
V2.7 5.5V
IN2
Input Voltage Range
mA100 250Current Limit
%/V-0.1 0 0.1Line Regulation
%/mA-0.01 0.01Output Load Regulation
mV
90 200
Dropout Voltage
1
V
1.25 3.5
V
OUT1
Nominal Output Adjustment
Range
2.70 4.95
2.7V < V
IN2
< 3.8V, 0h code
I
OUT2
= 0.1mA to 200mA
I
OUT2
= 200mA
I
OUT2
= 1mA
mA200 500Current Limit
%/V-0.3 0.3Line Regulation
%/mA-0.005 0.002Output Load Regulation
90 200
Dropout Voltage mV
1
% of
V
OUT2
-7.5 -5 -3V
RDY2
Output Ready Threshold
I
OUT3
= 0.1mA to 20mA %-3 3Output Accuracy
V2.7 5.5V
IN3
Input Voltage Range
kHz
0.8 ·
f
OSC
1.2 ·
f
OSC
f
OSC
SYNC Range
TA= 0°C to +85°C
TA= -40°C to +85°C
VLX= 12V µA0.1 10LX Leakage Current
VLX= 12V %100Maximum Duty Cycle
3V < V
IN0
< 12V %-0.3 0 0.3Line Regulation
I
OUT0
= 0.1mA to 500mA %-1.5Output Load Regulation
OSCILLATOR FREQUENCY (OUT0, OUT4)
LDO REGULATOR 1 (IN1, OUT1)
LDO REGULATOR 2 (IN2, OUT2)
LDO REGULATOR 3 (IN3, OUT3)
MAX886/MAX888
Wireless and Satellite Handset
Power-Management ICs
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
BATT
= V
IN0
= V
IN1
= +5.5V, GND = PGND = DGND, V
OFF
= V
SYNC
= 2.8V, V
IN2
= V
IN3
= V
IN4
= V
IN5
= +3.8V, V
OUT4
= +5.5V,
T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
I
OUT5
= 1mA
MAX886
I
OUT5
= 0.1mA to 100mA
No load
V
OUT3
= 2.85V or 4.65V only
3.8V < V
IN3
< 5.5V, V
OUT3
= 2.85V
CONDITIONS
1
V
2.175 3.300
V
OUT5
Nominal Output Adjustment
Range
%-3 3Output Accuracy
V2.7 5.5V
IN5
Input Voltage Range
V
5.10 5.25 5.41
V
OUT4
Output Voltage
kHzf
OSC
/ 2Switching Frequency
mA20 50Current Limit
%/V-0.3 0.3Line Regulation
UNITSMIN TYP MAXSYMBOLPARAMETER
V
LBI
= step from 1.23V to 1.27V
V
LBI
= 1.23V
2.7V < V
IN5
< 3.8V, 0h code
I
OUT5
= 0.1mA to 100mA
I
OUT5
= 100mA
µs10LBI Propagation Delay
µA-0.2 0.2LBI Input Current
mA100 250Current Limit
%/V-0.3 0.3Line Regulation
%/mA-0.01 0.01Output Load Regulation
mV
72 200
Dropout Voltage
0.4V
IL
ms28 37 47Start-Up Timeout Period
ms56 75 94Reset Timeout Period
V
1.2V
IH
ON Input Voltage
V
LBO
= I
LBHYS
= 1mA,
V
LBI
= V
REF
- 15mV
V0.5
LBO/LBHYS Output Low Voltage
V
LBO
= V
LBHYS
= 12V,
V
LBI
= V
REF
+ 15mV
µA-0.2 0.2
LBO/LBHYS Leakage Current
V
V
REF
V
REF
V
REF
+
15mV 15mV
LBI Threshold
MAX888 1.25 3.50
5.21I
OUT4
= 50mA
I
OUT3
= 0.1mA to 20mA %/mA-0.035 0.02Output Load Regulation
I
OUT3
= 20mA 20 50
I
OUT3
= 1mA
mV
1
Dropout Voltage
V
OUT2
4.65
2.85
V
IN3
= 5.5V,
Table 5
V
0
V
OUT3
Nominal Output Voltage
CHARGE-PUMP REGULATOR 4 (IN4, OUT4)
LDO REGULATOR 5 (IN5, OUT5)
LOW-BATTERY COMPARATOR
RESET AND START-UP TIMER
LOGIC AND CONTROL INPUTS
MAX886/MAX888
Wireless and Satellite Handset
Power-Management ICs
_______________________________________________________________________________________ 5
Note 1: Specifications to -40°C are guaranteed by design, not production tested.
ELECTRICAL CHARACTERISTICS (continued)
(V
BATT
= V
IN0
= V
IN1
= +5.5V, GND = PGND = DGND, V
OFF
= V
SYNC
= 2.8V, V
IN2
= V
IN3
= V
IN4
= V
IN5
= +3.8V, V
OUT4
= +5.5V,
T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
I
RESET
= 0,
internal 10kΩ pull-up resistor to OUT2
I
RESET
= 1mA
1.2V < VON< V
OUT2
CONDITIONS
µs0.6t
HIGH
SCL High Period
µs1.3t
LOW
SCL Low Period
kHz400f
SCL
SCL Clock Frequency
°C160Threshold Temperature
V
V
OUT2
-
0.5
V
RESETH
Output High Voltage
V0.5V
RESETL
Output Low Voltage
µA
ON Input Current
-16 -40I
IL
UNITSMIN TYP MAXSYMBOLPARAMETER
I
SDA
= 3mA 0.4
0.6V
IL
µs0 0.9t
DHOLD
Data Hold Time
ns100t
DSU
Data Set-Up Time
I
SDA
= 6mA
V
0.6
SDA Output Low Voltage
V
1.4V
IH
OFF, SDA, SCL Input Voltage
V
LBO
= V
LBHYST
= 12V,
V
LBI
= V
REF
+ 15mV
µA-0.2 0.2
LBO, LBHYS Leakage Current
0 < V
ILH
< V
OUT2
1I
ILH
µA
OFF, SDA, SCL Input Current
I
ONSTAT
= 0ONSTAT Output Voltage V
V
OUT2
-
0.5
V
ONSTATH
VSYNC Input Voltage
0.8V
IL
-5 -10I
IH
2.0V
IH
0 < V
SYNC
< V
OUT2
µASYNC Input Current 0.25 1I
SYNC
I
ONSTAT
= 1mA VONSTAT Output Voltage 0.5V
ONSTATL
VON= 0
ONSTAT OUTPUT
RESET OUTPUT
THERMAL SHUTDOWN
I2C-COMPATIBLE SERIAL INTERFACE
MAX886/MAX888
Wireless and Satellite Handset
Power-Management ICs
6 _______________________________________________________________________________________
Typical Operating Characteristics
(Circuit of Figure 2, REG0 to REG5 outputs at POR states, V
OUT0
= 3.75V, V
OUT4
= 5.25V, V
OUT1
= V
OUT2
= V
OUT3
= V
OUT5
= 3.3V,
TA= +25°C, unless otherwise noted.)
1 10 100 1,000
MAX886
REG0 EFFICIENCY vs. LOAD CURRENT
(V
BATT
= 8.4V)
MAX886/88-01
LOAD CURRENT (mA)
EFFICIENCY (%)
100
50
70
60
80
90
PFM, 375kHz
PFM, 925kHz
PWM, 375kHz
PWM, 925kHz
1 10 100 1,000
MAX886
REG0 EFFICIENCY vs. LOAD CURRENT
(V
BATT
= 5.4V)
MAX886/88-02
LOAD CURRENT (mA)
EFFICIENCY (%)
100
50
70
60
80
90
PFM, 375kHz
PFM, 925kHz
PWM, 375kHz
PWM, 925kHz
0
2
1
4
3
6
5
7
9
8
10
2 4563 789 1110 12
MAX886
NO-LOAD BATTERY CURRENT
vs. BATTERY VOLTAGE
MAX886/88-03
BATTERY VOLTAGE (V)
BATTERY CURRENT (mA)
PWM, 375kHz
PWM, 925kHz
PFM MODE
1 10 100 1,000
MAX888
REG0 EFFICIENCY vs. LOAD CURRENT
(V
BATT
= 4.2V)
MAX886/88-04
LOAD CURRENT (mA)
EFFICIENCY (%)
100
50
70
60
80
90
PFM, 375kHz
PFM, 925kHz
PWM, 375kHz
PWM, 925kHz
0
40
20
60
120
100
80
140
0 20 40 60 80 100 120 140 160 180 200
DROPOUT VOLTAGE
vs. LOAD CURRENT
MAX886/88-07
LOAD CURRENT (mA)
DROPOUT VOLTAGE (mV)
V
IN1
= V
IN2
= V
IN5
= 3.3V
V
IN3
= 2.85V
REG3
REG1
REG5
REG2
1 10 100 1,000
MAX888
REG0 EFFICIENCY vs. LOAD CURRENT
(V
BATT
= 2.7V)
MAX886/88-05
LOAD CURRENT (mA)
EFFICIENCY (%)
100
50
70
60
80
90
PFM, 375kHz
PFM, 925kHz
PWM, 375kHz
PWM, 925kHz
0
2
1
4
3
6
5
7
24356
MAX888
NO LOAD BATTERY CURRENT
vs. BATTERY VOLTAGE
MAX886/88-06
BATTERY VOLTAGE (V)
BATTERY CURRENT (mA)
PWM, 375kHz
PWM, 925kHz
PFM MODE
5.12
5.14
5.16
5.18
5.20
5.22
5.24
5.26
5.28
0 20406080100
REG4 OUTPUT VOLTAGE
vs. LOAD CURRENT
MAX886/88-08
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
V
IN4
= 3.75V
0
2
1
4
3
6
5
7
9
8
10
2 4563 789 1110 12
SHUTDOWN CURRENT
vs. BATTERY VOLTAGE
MAX886/88-09
BATTERY VOLTAGE (V)
SHUTDOWN CURRENT (µA)
R1, R2, R3 NOT CONNECTED
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