2
Absolute Maximum Ratings (T
A
= 25°C)
EN, LBI, . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+18V
LX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20V
V
DD
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .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: T
J
= T
C
= T
A
Electrical Specifications V
IN
= 5V, V
OUT
= 12V, I
OUT
= 0mA, R
T
= 100kΩ, T
A
= 25°C unless otherwise specified.
PARAMETER DESCRIPTION CONDITION MIN TYP MAX UNIT
IQ1 Quiescent Current - Shut-down VEN = 0 3 µA
IQ2 Quiensent Current VEN = 2V 2.5 4 mA
VFB Feedback Voltage 1.31 1.35 1.39 V
IB Feedback Input Bias Current 0.10 µA
V
IN
Input Voltage Range 2 V
D
MAX
Maximum Duty Cycle 84 90 %
I
LIM
Current Limit - Max Average Input
Current
1000 1250 1500 mA
I
SHDN
Shut-down Input Bias Current 1µA
V
LBI
LBI Threshold Voltage 180 220 250 mV
V
OL-LBO
LBO Output Low ILBO = 1mA 0.1 0.2 V
I
LEAK-LBO
LBO Output Leakage Current VLBI = 250mV, VLBO = 5V 0.02 1 µA
R
DS-ON
Switch On Resistance at 12V output 300 mΩ
I
LEAK-SWITCH
Switch Leakage Current 1µA
∆V
OUT
/∆V
IN
Line Regulation 3V < V
IN
< 6V, V
OUT
= 12V, no load 0.15 %/V
∆V
OUT
/∆I
OUT
Load Regulation I
OUT
< 250mA 0.5 %
F
OSC-MAX
Maximum Switching Frequency R
T
= 49.9kΩ 1200 kHz
F
OSC1
Switching Frequency 530 670 800 kHz
VHI_EN EN Input High Threshold 1.6 V
VLO_EN EN Input Low Threshold 0.5 V
Pin Descriptions
PIN NUMBER PIN NAME PIN FUNCTION
1 PGND Power ground; connected to the source of internal N-channel power MOSFET
2 SGND Signal ground; ground reference for all the control circuitry; needs to have only a single connection to PGND
3 RT Timing resistor to adjust the oscillation frequency of the converter
4 EN Chip enable; connects to logic HI (>1.6V) for chip to function
5 LBI Low battery input; connects to a sensing voltage, or left open if function is not used
6 LBO Low battery detection output; connected to the open drain of a MOSFET; able to sink 1mA current
7 SS Soft-start; connects to a capacitor to control the start-up of the converter
8 FB Voltage feedback input; needs to connect to resistor divider to decide V
O
9 VDD Control circuit positive supply
10 LX Inductor drive pin; connected to the drain of internal N-channel power MOSFET
EL7512
