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MAX863EEE+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
_______________General Description
The MAX863 dual-output DC-DC converter contains
two independent step-up controllers in a single com-
pact package. This monolithic Bi-CMOS design draws
only 85µA when both controllers are on. The input
range extends down to 1.5V, permitting use in organiz-
ers, translators, and other low-power hand-held prod-
ucts. The MAX863 provides 90% efficiency at output
loads from 20mA to over 1A. This space-saving device
is supplied in a 16-pin QSOP package that fits in the
same area as an 8-pin SOIC.
The device uses a current-limited, pulse-frequency-
modulated (PFM) control architecture that reduces start-
up surge currents and maintains low quiescent currents
for excellent low-current efficiency. Each controller
drives a low-cost, external, N-channel MOSFET switch,
whose size can be optimized for any output current or
voltage.
In larger systems, two MAX863s can be used to gener-
ate 5V, 3.3V, 12V, and 28V from just two or three bat-
tery cells. An evaluation kit (MAX863EVKIT) is available
to speed designs. For a single-output controller, refer to
the MAX608 and MAX1771 data sheets.
________________________Applications
2- and 3-Cell Portable Equipment
Organizers
Translators
Hand-Held Instruments
Palmtop Computers
Personal Digital Assistants (PDAs)
Dual Supply (Logic and LCD)
____________________________Features
♦ Smallest Dual Step-Up Converter: 16-Pin QSOP
♦ 90% Efficiency
♦ 1.5V Start-Up Voltage
♦ 85µA Max Total Quiescent Supply Current
♦ 1µA Shutdown Mode
♦ Independent Shutdown Inputs
♦ Drives Surface-Mount, Dual N-Channel MOSFETs
♦ Low-Battery Input/Output Comparator
♦ Step-Up/Down Configurable
MAX863
Dual, High-Efficiency, PFM, Step-Up
DC-DC Controller
________________________________________________________________ Maxim Integrated Products 1
MAX863
EXT2
CS2
OUT2
OUT1
V
IN
N
N
ON/OFF
FB2
SHDN1
EXT1
CS1
LBO
LOW-BATTERY
DETECTOR OUTPUT
LBI
SENSE1 V
DD
PGND
BOOT
GND
FB1
SHDN2
REF
__________________Pin Configuration
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
SENSE1 REF
SHDN2
LBI
LBO
FB2
SHDN1
CS2
EXT2
TOP VIEW
MAX863
QSOP
V
DD
FB1
EXT1
BOOT
CS1
GND
PGND
__________Typical Operating Circuit
19-1218; Rev 2; 2/98
PART
MAX863C/D
MAX863EEE -40°C to +85°C
0°C to +70°C
TEMP. RANGE PIN-PACKAGE
Dice*
16 QSOP
EVALUATION KIT MANUAL
AVAILABLE
______________Ordering Information
*Dice are tested at T
A
= +25°C.
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.
MAX863
Dual, High-Efficiency, PFM, Step-Up
DC-DC Controller
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
DD
= +5V, I
LOAD
= 0mA, 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.
V
DD
to GND............................................................-0.3V to +12V
PGND to GND .......................................................-0.3V to +0.3V
SHDN1, SHDN2, SENSE1, LBO to GND ................-0.3V to +12V
EXT1, EXT2 to PGND..................................-0.3V to (V
DD
+ 0.3V)
FB1, FB2, CS1, CS2, SEL,
LBI, BOOT to GND.................................-0.3V to (V
DD
+ 0.3V)
LBO Continuous Output Current.........................................15mA
EXT1, EXT2 Continuous Output Current .............................50mA
Continuous Power Dissipation (T
A
= +70°C)
QSOP (derate 8.30mW/°C above +70°C) ...................667mW
Operating Temperature Range
MAX863EEE ....................................................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
V
DD
= OUT1 = BOOT (Note 1)
CONDITIONS
1.5 11
UNITSMIN TYP MAXSYMBOLPARAMETER
(Note 2)
V
2.7 11
V
DD
V
DD
Input Voltage
SHDN1 = V
DD
, SHDN2 = GND,
measured from V
DD
µA
35 60
I
DD
Quiescent Current
SHDN1 = SHDN2 = V
DD
, measured from V
DD
50 85
V
IN
= 2.7V to 5V, V
OUT1
= 5V,
I
LOAD
= 300mA, Figure 2
mV/V8Line Regulation
V
IN
= 3.3V, V
OUT1
= 5V,
I
LOAD
= 0mA to 500mA, Figure 2
mV/A40Load Regulation
nA210I
FB
, I
LBI
FB1, FB2, LBI Input Current
V
DD
= 1.5V
V
0.7 x V
DD
V
IH
2.7V < V
DD
< 11V 1.6
SHDN1, SHDN2, SEL, BOOT
Input High Voltage
mV85 100 115V
CS
CS1, CS2 Threshold Voltage
µs14 17.5 22
Logic input = V
DD
or GND
t
ON
Maximum Switch On-Time
µA125CS1, CS2 Input Current
µA1I
I
SHDN1, SHDN2, SEL, BOOT
Input Current
V1.225 1.25 1.275V
FB
, V
LBI
FB1, FB2, LBI
Threshold Voltage (Note 4)
C
LOAD
= 1nF, 10% to 90% ns50EXT Rise/Fall Time (Note 5)
µs1.6 2 2.4t
OFF
Minimum Switch Off-Time
FB1 = GND
V
4.85 5 5.15
V
OUT1
OUT1 Output Voltage
(Note 3)
FB1 = V
DD
3.2 3.3 3.4
V
DD
= 1.5V
V
0.2 x V
DD
V
IL
2.7V < V
DD
< 11V 0.4
SHDN1, SHDN2, SEL, BOOT
Input Low Voltage
SHDN1 = SHDN2 = GND
µA1I
DD, SHDN
Shutdown Current
Ω
5EXT On-Resistance
V
LBO
= 11V, V
LBI
> 1.275V µA1I
LBO
LBO Leakage Current
I
LBO
,
SINK
= 1mA, V
LBI
< 1.225V V0.1 0.4V
LBO,L
LBO Low Level
MAX863
Dual, High-Efficiency, PFM, Step-Up
DC-DC Controller
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS
(V
DD
= +5V, I
LOAD
= 0mA, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 6)
Note 1: When bootstrapped, an internal low-voltage oscillator drives the EXT1 pin rail-to-rail for low supply voltages.
Note 2: For non-bootstrapped operation, V
DD
> 2.7V is required to allow valid operation of all internal circuitry.
Note 3: For adjustable output voltages, see the Set the Output Voltage section.
Note 4: Measured with LBI falling. Typical hysteresis is 15mV.
Note 5: EXT1 and EXT2 swing from V
DD
to GND.
Note 6: Specifications to -40°C are guaranteed by design and not production tested.
V
DD
= OUT1 (Note 1) 1.6 11
CONDITIONS
V
DD
Input Voltage
(Note 2)
V
2.8 11
V
DD
V1.21 1.285V
FB
FB1, FB2 Threshold Voltage
60
mV85 115V
CS
CS1, CS2 Threshold Voltage
UNITSMIN TYP MAXSYMBOLPARAMETER
FB1 = V
DD
3.15 3.45
OUT1 Output Voltage
(Note 3)
FB1 = GND
V
4.8 5.2
V
OUT1
SHDN1 = SHDN2 = V
DD
, measured from V
DD
85
Quiescent Current
SHDN1 = V
DD
, SHDN2 = GND,
measured from V
DD
µAI
DD
SHDN1 = SHDN2 = GND
µA1I
DD, SHDN
Shutdown Current
__________________________________________Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
0.01 0.1 1 10 100 1000
EFFICIENCY vs. OUTPUT CURRENT
(V
OUT1
= 3.3V, BOOTSTRAPPED)
MAX863 toc01
OUTPUT CURRENT (mA)
EFFICIENCY (%)
B
C
A
10
0
30
20
50
40
70
60
90
80
100
V
OUT1
= 3.3V
A: V
IN
= 1.5V
B: V
IN
= 2.4V
C: V
IN
= 2.7V
0.01 0.1
10
0
30
20
50
40
70
60
90
80
100
1 10 100 1000
EFFICIENCY vs. OUTPUT CURRENT
(V
OUT1
= 5.0V, BOOTSTRAPPED)
MAX863 toc02
OUTPUT CURRENT (mA)
EFFICIENCY (%)
V
OUT1
= 5.0V
A: V
IN
= 1.5V
B: V
IN
= 2.4V
C: V
IN
= 2.7V
D: V
IN
= 3.3V
E: V
IN
= 3.6V
F: V
IN
= 4.0V
B
C
A
D
E
F
0.01 0.1
0
10
20
30
40
50
60
70
80
90
100
1 10 100 1000
EFFICIENCY vs. OUTPUT CURRENT
(V
OUT1
= 5.0V, NON-BOOTSTRAPPED)
MAX863 toc03
OUTPUT CURRENT (mA)
EFFICIENCY (%)
V
OUT1
= 5.0V
A: V
IN
= 2.7V
B: V
IN
= 3.3V
C: V
IN
= 3.6V
D: V
IN
= 4.0V
A
B
C
D
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

MAX863EEE+

Mfr. #:
Buy MAX863EEE+
Manufacturer:
Maxim Integrated
Description:
Switching Controllers Dual PFM Step-Up DC/DC Controller
Lifecycle:
New from this manufacturer.
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