Electrical characteristics (continued) – Rainbow Electronics MAX8625A User Manual
Page 3
MAX8625A
High-Efficiency, Seamless Transition,
Step-Up/Down DC-DC Converter
_______________________________________________________________________________________
3
Note 2: Devices are production tested at T
A
= +25°C. Specifications over the operating temperature range are guaranteed by
design and characterization.
Note 3: Limits are guaranteed by design and not production tested.
Note 4: The idle-mode current threshold is the transition point between fixed-frequency PWM operation and idle-mode operation.
The specification is given in terms of output load current for an inductor value of 3.3µH. For the step-up mode, the idle-mode
transition varies with input to the output-voltage ratios.
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 3.6V, ON = SKIP = IN, FB = GND, V
OUT
= 3.3V, LX_ unconnected, C
REF
= C5 = 0.1µF to GND, Figure 4. T
A
= -40°C to +85°C.
Typical values are at T
A
= +25°C, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
FB Dual-Mode Threshold
V
FBDM
75
100
125
mV
V
FB
= 1.3V, T
A
= +25°C
0.001
0.1
FB Leakage Current
I
FB
V
FB
= 1.3V, T
A
= +85°C
0.01
µA
ON, SKIP Input High Voltage
V
IH
2.5V < V
IN
< 5.5V
1.6
V
ON, SKIP Input Low Voltage
V
IL
2.5V < V
IN
< 5.5V
0.45
V
2.5V < V
IN
< 5.5V, T
A
= +25°C
0.001
1
ON Input Leakage Current
I
IHL
T
A
= +85°C
0.01
µA
I
SKIPH
V
SKIP
= 3.6V
3
12
SKIP Input Leakage Current
I
SKIPL
V
SKIP
= 0V
-2
-0.2
µA
Peak Current Limit
I
LIMP
LX1 PMOS
1700
2000
2300
mA
Fault Latch-Off Delay
100
ms
Each MOSFET, T
A
= +25°C
0.05
0.1
MOSFET On-Resistance
R
ON
Each MOSFET, V
IN
= 2.5V to 5.5V,
T
A
= -40°C to +85°C
0.2
Ω
Rectifier-Off Current Threshold
I
LX1OFF
SKIP = GND
125
mA
SKIP = GND, load decreasing
100
Idle-Mode Current Threshold
(Note 4)
I
SKIP
Load increasing
300
mA
V
IN
= V
OUT
= 5.5V, V
LX1
= 0V to V
IN
,
V
LX2
= 0V to V
OUT
, T
A
= +25°C
0.01
1
LX1, LX2 Leakage Current
I
LXLKG
T
A
= +85°C
0.2
µA
V
IN
= V
LX1
= V
LX2
= 0V, V
OUT
= 5.5V,
measure I (LX2), T
A
= +25°C
0.01
1
Out Reverse Current
I
LXLKGR
T
A
= +85°C
0.5
µA
Minimum T
ON
T
ONMIN
25
%
OSC Frequency
F
OSCPWM
850
1000
1150
kHz
Thermal Shutdown
15°C hysteresis
+165
°C