Rainbow Electronics MAX1765 - Manual (Page 5)

MAX1765
800mA, Low-Noise, Step-Up DC-DC Converter
with 500mA Linear Regulator
_______________________________________________________________________________________ 5
ELECTRICAL CHARACTERISTICS
(V OUT = V POUT = V INL = V ONA = V ONL = 3.6V, CLK/SEL = FBL = ONB = TRACK = PGND = GND, ISET = REF (bypassed with
0.22µF), LX = open, OUTL = open (bypassed with 4.7µF), T A = -40°C to +85°C, unless otherwise noted.) (Note 6)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DC-DC CONVERTER
FB Regulation Voltage V FB CLK/SEL = OUT, 0 < I LX < 0.55A 1.210 1.280 V
OUT Voltage in Track Mode V OUTL > 2.0V, INL = POUT
V OUTL
+ 0.4
V OUTL
+ 0.6
V
Startup to Normal Mode
Transition Voltage
Rising edge only (Note 2) 2.00 2.30 V
Supply Current in Normal Mode
(Note 3)
CLK/SEL = ONL = GND, no load 200 µA
Supply Current in
Low-Noise PWM Mode (Note 3
C LK/S E L = OU T, V FB = 1.5V , no l oad 200 µA
Supply Current in Shutdown ONA = ONL = GND, ONB = OUT 10 µA
DC-DC SWITCHES
POUT Leakage Current V LX = 0, V OUT = 5.5V 10 µA
LX Leakage Current V
LX
= V
OUT
= V ONB = 5.5V, ONA = GND 10 µA
N-channel 0.28
Switch On-Resistance
P-channel 0.50
Ω
N - C hannel C ur r ent Li m i t ( N ote 4) I LIM V ISET = 1.25V, CLK/SEL = GND or OUT 1000 1600 mA
P-Channel Turn-Off Current CLK/SEL = GND 5 120 mA
REFERENCE
Reference Output Voltage I REF = 0 1.225 1.275 V
LINEAR REGULATOR
Output Voltage in Internal
Feedback Mode
FBL = GND, I OUTL = 10mA 2.79 2.90 V
FBL Input Threshold 150 350 mV
FBL Regulation Voltage FBL = OUTL, I OUTL = 10mA, I REF = 0 1.225 1.275 V
LDO Startup Voltage V OUT = 2V, rising edge only 2.15 2.45 V
Dropout Resistance V FBL = 1V, I OUTL = 500mA 0.5 Ω
INL Supply Current in Shutdown OUTL = ONA = ONL = GND 10 µA
INL No-Load Supply Current I OUTL = 0, V INL = 5.5V 250 µA