XC9236A33DMR Datasheet, PDF (6/33 Pages) Torex Semiconductor – 600mA Driver Tr. Built-In, Synchronous Step-Down DC/DC Converters

XC9235/XC9236/XC9237 Series
˙ELECTRICAL CHARACTERISTICS (Continued)
XC9237A18Dxx, V_OUT=1.8V, f_OSC=3.0MHz, Ta=25℃
PARAMETER
SYMBOL
CONDITIONS
MIN. TYP. MAX. UNIT CIRCUIT
Output Voltage
Operating Voltage Range
Maximum Output Current
V_OUT
V_IN
I_OUTMAX
When connected to external components,
V_IN=V_CE=5.0V, I_OUT=30mA
V_IN=V_OUT(E)+2.0V, V_CE=1.0V,
When connected to external components ^(*9)
1.764 1.800 1.836 V
ᶃ
2.0
-
6.0
V
ᶃ
600
-
-
mA
ᶃ
UVLO Voltage
Supply Current
Stand-by Current
Oscillation Frequency
PFM Switching Current
PFM Duty Limit
Maximum Duty Cycle
Minimum Duty Cycle
Efficiency
Lx SW "H" ON Resistance 1
Lx SW "H" ON Resistance 2
Lx SW "L" ON Resistance 1
Lx SW "L" ON Resistance 2
Lx SW "H" Leak Current ^(*5)
Lx SW "L" Leak Current ^(*5)
Current Limit ^(*10)
Output Voltage
Temperature Characteristics
CE "H" Voltage
CE "L" Voltage
V_UVLO
V_CE=V_IN, V_OUT=0V,
Voltage which Lx pin holding “L” level ^(*1,*11)
I_DD
V_IN=V_CE=5.0V, V_OUT=V_OUT(E)Ê·1.1V
I_STB
V_IN=5.0V, V_CE=0V, V_OUT=V_OUT(E)Ê·1.1V
f_OSC
When connected to external components,
V_IN=V_OUT(E)+2.0V, V_CE=1.0V, I_OUT=100mA
I_PFM
DTY_{LIMIT_PFM}
When connected to external components,
V_IN=V_OUT(E)+2.0V, V_CE=V_IN, I_OUT=1mA ^(*12)
V_CE=V_IN=(C-1), I_OUT=1mA ^(*12)
DTY_MAX
V_IN=V_CE=5.0V, V_OUT=V_OUT(E)Ê·0.9V
DTY_MIN
EFFI
R_LxH
R_LxH
R_LxL
R_LxL
I_LeakH
I_LeakL
I_LIM
˚V_OUT/
(V_OUTɾ˚Topr)
V_CEH
V_CEL
V_IN=V_CE=5.0V, V_OUT=V_OUT(E)Ê·0.1V
When connected to external components,
V_CE=V_INʹV_OUT(E)+1.2V, I_OUT=100mA
V_IN=V_CE=5.0V, V_OUT =0V, I_Lx=100mA ^(*3)
V_IN=V_CE=3.6V, V_OUT =0V, I_Lx=100mA ^(*3)
V_IN=V_CE=5.0V ^(*4)
V_IN=V_CE=3.6V ^(*4)
V_IN=V_OUT=5.0V, V_CE=0V, Lx=0V
V_IN=V_OUT=5.0V, V_CE=0V, Lx=5.0V
V_IN=V_CE=5.0V, V_OUT=V_OUT(E)Ê·0.9V ^(*8)
I_OUT=30mA, -40ˆʽToprʽ85ˆ
V_OUT=0V, Applied voltage to V_CE,
Voltage changes Lx to “H” level ^(*11)
V_OUT=0V, Applied voltage to V_CE,
Voltage changes Lx to “L” level ^(*11)
1.00 1.40 1.78 V
ᶅ
-
21
35 ЖA
ᶄ
-
0
1.0 ЖA
ᶄ
2550 3000 3450 kHz
ᶃ
170 220 270 mA
ᶃ
-
200 300 %
ᶃ
100
-
-
%
ᶅ
-
-
0
%
ᶅ
-
86
-
%
ᶃ
-
0.35 0.55 Њ
ᶆ
-
0.42 0.67 Њ
ᶆ
-
0.45 0.66 Њ
-
-
0.52 0.77 Њ
-
-
0.01 1.0 ЖA
ᶇ
-
0.01 1.0 ЖA
ᶇ
900 1050 1350 mA
ᶈ
- ʶ100 - ppm/ˆ ᶃ
0.65
-
6.0
V
ᶅ
V_SS
-
0.25 V
ᶅ
PWM "H" Level Voltage
When connected to external components,ç
V_PWMH
I_OUT=1mA ^(*6), Voltage which oscillation frequency
-
- V_IN - 1.0 V
ᶃ
becomes 2550kHzʽf_OSCʽ3450kHz ^(*13)
PWM "L" Level Voltage
V_PWML
When connected to external components,ç
I_OUT=1mA ^(*6), Voltage which oscillation frequency
becomes f_OSCʻ2550kHz ^(*13)
V_IN –
0.25
-
-
V
ᶃ
CE "H" Current
I_CEH
V_IN=V_CE=5.0V, V_OUT=0V
- 0.1
-
0.1 ЖA
ᶇ
CE "L" Current
I_CEL
V_IN=5.0V, V_CE=0V, V_OUT=0V
- 0.1
-
0.1 ЖA
ᶇ
Soft Start Time
t_SS
When connected to external components,ç
V_CE=0V Ë  V_IN, I_OUT=1mA
0.5 0.9 2.5 ms
ᶃ
Latch Time
t_LAT
V_IN=V_CE=5.0V, V_OUT=0.8Ê·V_OUT(E),
Short Lx at 1Њ resistance ^(*7)
1.0
-
20
ms
ᶉ
Short Protection Threshold
Voltage
V_SHORT
Sweeping V_OUT, V_IN=V_CE=5.0V, Short Lx at
1Њ resistance, V_OUT voltage which Lx becomes 0.675 0.900 1.150 V
“L” level within 1ms
ᶉ
Test conditions: Unless otherwise stated, V_IN=5.0V, V_OUT(E)=Nominal Voltage
NOTE:
*1: Including hysteresis operating voltage range.
*2: EFFI = { ( output voltageʷoutput current ) öç( input voltageʷinput current) }ʷ100
*3: ON resistance (Њ)= (V_IN - Lx pin measurement voltage) öç100mA
*4: R&D value
*5: When temperature is high, a current of approximately 10ЖA (maximum) may leak.
*6: The CE/MODE pin of the XC9237A series works also as an external switching pin of PWM control and PWM/PFM control. When the IC is in the operation,
control is switched to the automatic PWM/PFM switching mode when the CE/MODE pin voltage is equal to or greater than V_IN minus 0.3V, and to the PWM
mode when the CE/MODE pin voltage is equal to or lower than V_IN minus 1.0V and equal to or greater than V_CEH.
*7: Time until it short-circuits V_OUT with GND via 1Њof resistor from an operational state and is set to Lx=0V from current limit pulse generating.
*8: When V_IN is less than 2.4V, limit current may not be reached because voltage falls caused by ON resistance.
*9: When the difference between the input and the output is small, some cycles may be skipped completely before current maximizes.
If current is further pulled from this state, output voltage will decrease because of P-ch driver ON resistance.
*10: Current limit denotes the level of detection at peak of coil current.
*11: “H”=V_IN~V_IN-1.2V, “L”=+0.1V~-0.1V
*12: XC9235 series exclude I_PFM and DTY_{LIMIT_PFM} because those are only for the PFM control’s functions.
*13: XC9235/9236 series exclude V_PWMH and V_PWML because those are only for the XC9237 series’ functions.
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