MAX1705/MAX1706
1- to 3-Cell, High-Current, Low-Noise,
Step-Up DC-DC Converters with Linear Regulator
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.)
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.
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, 10s) .................................+300°C
CLK/SEL = OUT
-1µA < I
REF
< 50µA
(Note 1)
I
REF
= 0µA
CLK/SEL = GND, V
FB
= V
FBLDO
= 1.5V,
no load
ONA = GND, ONB = OUT, measure I
OUT
(Note 2)
V
POUT
= V
OUT
= 1.5V
V
FB
= 1.5V
MAX1705, 0A ≤ I
LX
≤ 0.5A;
MAX1706, 0A ≤ I
LX
≤ 0.25A;
CLK/SEL = OUT
TRACK = V
LDO
> 2.3V
CLK/SEL = OUT
CONDITIONS
mV415Reference Load Regulation
V1.238 1.250 1.262Reference Output Voltage
µA180 360
I
OUT
Supply Current in
Low-Noise Mode
V1.219 1.233 1.247FB Regulation Voltage
V0.7
Minimum Operating Battery
Voltage
µA100 190I
OUT
Supply Current in
Low-Power Mode
µA120I
OUT
Supply Current in Shutdown
V2.00 2.15 2.30
Startup to Normal Mode
Transition Voltage
kHz40 150 300f
LX
Frequency in Startup Mode
nA0.01 50FB Input Current
V2.5 5.5OUT Adjust Range
%0.65 1.25Load Regulation
V
V
LDO
V
LDO
V
LDO
+ 0.2 + 0.3 + 0.4
OUT Voltage in Track Mode
UNITSMIN TYP MAXSYMBOLPARAMETER
T
A
= +25°C, I
LOAD
< 1mA, Figure 2 V0.9 1.1Minimum Startup Voltage
2.5V < V
OUT
< 5.5V mV0.2 5Reference Supply Regulation
DC-DC CONVERTER
REFERENCE
V
FB
= V
FBLDO
= 1.5V, no load
FB = GND (LX switching) 2.1 mA
