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