MAX1705/MAX1706
1- to 3-Cell, High-Current, Low-Noise,
Step-Up DC-DC Converters with Linear Regulator
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ELECTRICAL CHARACTERISTICS (continued)
(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
= -40°C to +85°C, unless otherwise noted, Note 4.)
PARAMETER SYMBOL MIN TYP MAX UNITS
LBN, LBP Common-Mode
Input Range
0.5 1.5 V
CONDITIONS
LBN = 0.5V and 1.5V (at least one input must
be within this range)
LBO High Leakage 1 µALBO = OUT = 5V
Input Low Level
0.15V
OUT
V
1.2V < V
OUT
< 5.5V, ONA, ONB (Note 2)
0.85V
OUT
1.2V < V
OUT
< 5.5V, ONA, ONB (Note 2)
Internal Oscillator Frequency 260 340 kHzCLK/SEL = OUT
External Oscillator
Synchronization Range
200 400 kHz
0.85V
OUT
V
OUT
= 5.5V, CLK/SEL, TRACK
Note 1: Once the output is in regulation, the MAX1705/MAX1706 operate down to a 0.7V input voltage.
Note 2: The device is in startup mode when V
OUT
is below this value (see Low-Voltage Startup Oscillator section).
Note 3: ONA and ONB inputs have a hysteresis of approximately 0.15V
OUT
.
Note 4: Specifications to -40°C to are guaranteed by design, not production tested.
Input High Level
V
OUT
= 2.5V, CLK/SEL, TRACK 0.15V
OUT
V
LBN, LBP Offset -5 +5 mVLBP falling
FBLDO Regulation Voltage 1.233 1.268 VFBLDO = LDO, I
LOAD
= 1mA
Short-Circuit Current Limit 220 600 mAFBLDO = LDO = GND
FBLDO Input Current 0.01 50 nAV
FBLDO
= 1.5V
Dropout Resistance 1.2 ΩV
FBLDO
= 1V, I
LDO
= 200mA
LINEAR REGULATOR
CONTROL INPUTS
LOW-BATTERY COMPARATOR
