1- to 3-Cell, High-Current, Low-Noise,
Step-Up DC-DC Converters with Linear Regulator
MAX1705/MAX1706
ABSOLUTE MAXIMUM RATINGS
ONA,
ONB,
FBLDO, OUT, POUT to GND...................-0.3V to 6V
PGND to GND.....................................................................±0.3V
POUT to OUT ......................................................................±0.3V
LX to PGND ............................................-0.3V to (V
POUT
+ 0.3V)
CLK/SEL, REF, FB, TRACK, LDO,
LBN, LBP, LBO to GND.......................-0.3V to (V
OUT
+ 0.3V)
LDO Short Circuit .......................................................Continuous
Continuous Power Dissipation (T
A
= +70°C)
QSOP (derate 8.70mW/°C above +70°C) ...................696mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+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
(V
OUT
= V
POUT
= V
LBP
= 3.6V, CLK/SEL = FB = LBN = LBO = ONA =
ONB
= TRACK = GND, REF = open (bypassed with 0.22µF),
LX = open,
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
DC-DC CONVERTER
Minimum Start-Up Voltage
Minimum Operating Battery
Voltage
FB Regulation Voltage
FB Input Current
OUT Adjust Range
Load Regulation
MAX1705, 0A
≤
I
LX
≤
0.5A;
MAX1706, 0A
≤
I
LX
≤
0.25A;
CLK/SEL = OUT
TRACK = V
LDO
> 2.3V
f
LX
V
POUT
= V
OUT
= 1.5V
(Note 2)
I
OUT
I
OUT
ONA = GND,
ONB
= OUT, measure I
OUT
CLK/SEL = GND, V
FB
= V
FBLDO
= 1.5V,
no load
V
FB
= V
FBLDO
= 1.5V, no load
I
OUT
CLK/SEL = OUT
FB = GND (LX switching)
I
REF
= 0µA
-1µA < I
REF
< 50µA
2.5V < V
OUT
< 5.5V
1.238
2.1
1.250
4
0.2
1.262
15
5
mA
V
mV
mV
V
LDO
+ 0.2
40
2.00
T
A
= +25°C, I
LOAD
< 1mA, Figure 2
(Note 1)
CLK/SEL = OUT
V
FB
= 1.5V
2.5
0.65
V
LDO
+ 0.3
150
2.15
1
100
180
1.219
0.9
0.7
1.233
0.01
1.247
50
5.5
1.25
V
LDO
+ 0.4
300
2.30
20
190
360
1.1
V
V
V
nA
V
%
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
OUT Voltage in Track Mode
Frequency in Start-Up Mode
Start-Up to Normal Mode
Transition Voltage
Supply Current in Shutdown
Supply Current in
Low-Power Mode
Supply Current in
Low-Noise Mode
REFERENCE
Reference Output Voltage
Reference Load Regulation
Reference Supply Regulation
V
kHz
V
µA
µA
µA
2
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
