EL7512CY データシートの表示（PDF） - Renesas Electronics
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EL7512CY Datasheet PDF : 8 Pages
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EL7512
Absolute Maximum Ratings (TA = 25°C)
EN, LBI, . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+18V
LX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20V
VDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12V
Storage Temperature. . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Operating Temperature . . . . . . . . . . . . . . . . . . . . . . .-40°C to +85°C
Operating Junction Temperature: . . . . . . . . . . . . . . . . . . . . . . 135°C
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typical values are for information purposes only. Unless otherwise noted, all tests
are at the specified temperature and are pulsed tests, therefore: TJ = TC = TA
Electrical Specifications VIN = 5V, VOUT = 12V, IOUT = 0mA, RT = 100k, TA = 25°C unless otherwise specified.
PARAMETER
DESCRIPTION
CONDITION
MIN
TYP
IQ1
Quiescent Current - Shut-down
VEN = 0
IQ2
Quiensent Current
VEN = 2V
2.5
VFB
Feedback Voltage
1.31 1.35
IB
Feedback Input Bias Current
VIN
DMAX
ILIM
Input Voltage Range
Maximum Duty Cycle
Current Limit - Max Average Input
Current
2
84
1000
90
1250
ISHDN
VLBI
VOL-LBO
ILEAK-LBO
RDS-ON
ILEAK-SWITCH
VOUT/VIN
VOUT/IOUT
FOSC-MAX
FOSC1
VHI_EN
Shut-down Input Bias Current
LBI Threshold Voltage
LBO Output Low
LBO Output Leakage Current
Switch On Resistance
Switch Leakage Current
Line Regulation
Load Regulation
Maximum Switching Frequency
Switching Frequency
EN Input High Threshold
ILBO = 1mA
VLBI = 250mV, VLBO = 5V
at 12V output
3V < VIN < 6V, VOUT = 12V, no load
IOUT < 250mA
RT = 49.9k
180
220
0.1
0.02
300
0.5
1200
530
670
1.6
VLO_EN
EN Input Low Threshold
MAX
3
4
1.39
0.10
1500
1
250
0.2
1
1
0.15
800
0.5
UNIT
µA
mA
V
µA
V
%
mA
µA
mV
V
µA
m
µA
%/V
%
kHz
kHz
V
V
Pin Descriptions
PIN NUMBER PIN NAME
1
PGND
2
SGND
3
RT
4
EN
5
LBI
6
LBO
7
SS
8
FB
9
VDD
10
LX
PIN FUNCTION
Power ground; connected to the source of internal N-channel power MOSFET
Signal ground; ground reference for all the control circuitry; needs to have only a single connection to PGND
Timing resistor to adjust the oscillation frequency of the converter
Chip enable; connects to logic HI (>1.6V) for chip to function
Low battery input; connects to a sensing voltage, or left open if function is not used
Low battery detection output; connected to the open drain of a MOSFET; able to sink 1mA current
Soft-start; connects to a capacitor to control the start-up of the converter
Voltage feedback input; needs to connect to resistor divider to decide VO
Control circuit positive supply
Inductor drive pin; connected to the drain of internal N-channel power MOSFET
FN7290 Rev 1.00
May 23, 2005
Page 2 of 8
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