MAX1612 Datasheet, PDF (3/12 Pages) Maxim Integrated Products – Bridge-Battery Backup Controllers for Notebooks

Bridge-Battery Backup Controllers
for Notebooks
ELECTRICAL CHARACTERISTICS (continued)
(V_LRI = V_ISET = 20V, CCMD = DCMD = BBON = LRO, V_BBATT = 3V, T_A = T_MIN to T_MAX, unless otherwise noted. Typical values are at
T_A = +25°C.) (Note 1)
PARAMETER
DC-DC CONVERTER
FB Trip Point
FB Input Current
LX Switch Current Limit
LX Off-Leakage
LX On-Resistance
SYMBOL
V_FB
I_FB
I_PEAK
R_DSON
LX Zero Crossing Trip Threshold
BBON Logic Input Low Voltage
TIMER BLOCK
CC Output Current
CD Oscillator Frequency
CC Oscillator Frequency
ISET Logic Input Low Voltage
CD to CC Current Matching
CD_OSC
CC_OSC
CONDITIONS
MIN
V_FB = 2.1V
R _BBON = 100kΩ to GND
V_LX = 12V
I_LX = 200mA
Voltage that allows a new cycle, defined as
(V_BBATT - V_LX) (see DC-DC Converter section)
1.95
0.580
-0.2
V _CCMD = 0, CC = GND
C_CD = 3.3nF
C_CC = 33nF
Resets the counter
V _DCMD = 0, CD = GND
4.35
600
60
0.4
-1
TYP
0.15
0.835
0.01
0.5
-0.1
5.00
758
75.8
MAX UNIT
2.05
V
10
nA
1.100 A
10
µA
1.5
Ω
0.2
V
2.1
V
5.65 µA
950 Hz
95
Hz
V
1
%
Logic Input Low Level
V_IL
CCMD, DCMD
0.8
V
Logic Input High Level
V_IH
CCMD, DCMD
2.2
Logic Input Leakage Current
I_(CCMD),
I_(DCMD)
V _CCMD, V _DCMD = 0 to V_LRO
Note 1: Specifications from 0°C to -40°C are guaranteed by design, not production tested.
V
1
µA
(Circuit of Figure 3, T_A = +25°C, unless otherwise noted.)
Typical Operating Characteristics
DISCHARGE TIME
vs. OUTPUT CURRENT
120
2 CELLS (SANYO N-50AAA)
100
80
V_OUT = 5V
60
V_OUT = 7V
40
20
0
0 5 10 15 20 25 30 35 40 45
OUTPUT CURRENT (mA)
OSCILLATOR FREQUENCY
vs. CAPACITANCE
100k
10k
1k
100
CD
CC
10
1
0.1
1
10
100
1000
CAPACITANCE (nF)
EFFICIENCY vs. OUTPUT CURRENT
(BBATT = 3.6V)
90
80
V_OUT = 5V
70
60
V_OUT = 7V
V_OUT = 6V
50
40
30
20
10
0
1µ
BBATT = 3.6V
R_BBON = 240kΩ
NOTE: DC-DC
CONVERTER
SUPPLIES V_LRI
10µ 100µ 1m 10m 100m 1
OUTPUT CURRENT (A)
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