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
(19 strony)
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