Rainbow Electronics MAX1706 - Manual (Page 4)

MAX1705/MAX1706
1- to 3-Cell, High-Current, Low-Noise,
Step-Up DC-DC Converters with Linear Regulator
4 _______________________________________________________________________________________
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 = 0°C to +85°C, unless otherwise noted. Typical values are at T A = +25°C.)
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 = -40°C to +85°C, unless otherwise noted, Note 4.)
PARAMETER SYMBOL MIN TYP MAX UNITS
Minimum CLK/SEL Pulse
Internal Oscillator Frequency 260 300 340 kHz
200 ns
Maximum CLK/SEL
Rise/Fall Time
100 ns
CONDITIONS
CLK/SEL = OUT
Supply Current in
Low-Power Mode
I OUT 190 µA CLK/SEL = 0V, FB = FBLDO = 1.5V, no load
Supply Current in Shutdown I OUT 20 µA ONA = 0V, ONB = OUT, measure I OUT
OUT Voltage in Track Mode
V LDO + V LDO +
0.2 0.4
V TRACK = OUT, V LDO > 2.3V
250 570 MAX1706
MAX1706
CLK/SEL = OUT
CLK/SEL = 0V
MAX1705
CLK/SEL = OUT
CLK/SEL = 0V
0.28
MAX1705
Switch On-Resistance
0.45
Ω
N-channel, I LX = 100mA
550 950 N-Channel MOSFET
Current Limit
I LIM
1000 1700
mA
CLK/SEL = OUT
250 570
0.50
CLK/SEL = 0V
P-channel, I LX = 100mA
PARAMETER SYMBOL MIN TYP MAX
P-Channel Synchronous-
Rectifier Turn-Off Current
UNITS CONDITIONS
20 120 mA
Start-Up to Normal Mode
Transition Voltage
2.0 2.3 V
FB Regulation Voltage 1.215 1.251 V CLK/SEL = OUT
Reference Output Voltage 1.235 1.265 V I REF = 0µA
Oscillator Maximum Duty Cycle 80 86 90 %
External Oscillator
Synchronization Range
200 400 kHz
Supply Current in
Low-Noise Mode
I OUT 360 µA
CLK/SEL = OUT, V
FB
= V
FBLDO
= 1.5V,
no load
DC-DC CONVERTER
REFERENCE
DC-DC CONVERTER