LY1152_12 [LYONTEK]
Inverting DC/DC Controller (SOP); 负输出DC / DC控制器（ SOP ）
| 型号： | LY1152_12 |
| 厂家： | 
Lyontek Inc. |
| 描述： | Inverting DC/DC Controller (SOP) |
| 文件： | 总5页 (文件大小：234K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
®
LY1152
Rev. 1.2
Inverting DC/DC Controller (SOP)
FEATURES
GENERAL DESCRIPTION
2.4V ~ 7.0V Power supply.
Low shutdown current at 0.1uA (Typical).
Low quiescent current at 90.0uA (Typical).
Adjustable Output Voltage to -40V.
60KHz ~ 160KHz Switching Frequency.
High Efficiency with Low Cost External PNP
Bipolar Transistor.
Pulse Frequency Modulation Maintains High
Efficiency (80%).
The LY1152 is a high performance inverting DC/DC
controller, and the LY1152 designed to drive an
external power switch to generate adjustable
negative voltages. Output voltage can be scaled to
-40V.
The LY1152 quiescent current is about 90.0uA and
shutdown mode current can be reduced to 0.1uA.
In the LCD bias contrast application, efficiency of
80% can be achieved with low cost PNP bipolar
transistor drivers.
Lead free and green package available.
(RoHS Compliant)
Space Saving Package：
The LY1152 switching frequency can be around
60KHz to 160KHz range, and small size package is
ideally suited for powered portable equipments.
- 8-pin SOP package.
APPLICATION
Negative Voltage Supply.
Negative LCD Contrast Bias for
- Portable Data Collection Terminals.
- Notebook Computers.
PIN CONFIGURATION
LY1152 SOP8 (Top View)
Lyontek Inc. reserves the rights to change the specifications and products without notice.
5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
1
®
LY1152
Rev. 1.2
Inverting DC/DC Controller (SOP)
PIN DESCRIPTION
SYMBOL
VIN
PIN NO
DESCRIPTION
1
2
3
4
5
6
7
8
Power supply input
VREF
SHUTDOWN
FB
Reference output (1.22V).(*1)
Shutdown the device.(when low level is enable)(*2)
Feedback signal input to sense ground.(*3)
Ground.
GND
DLOW
DHI
Driver sinking output.(*4)
Driver sourcing output.(*5)
CL
Current-limit input.(*6)
(*1)：Bypass with 0.047uF capacitor to GND, Sourcing capability is guaranteed to be greater than 250uA.
(*2)：>1.5V = operation mode, GND = shutdown, In shutdown mode DLOW and DHI pins are at high level.
(*3)：Connecting a resistor R2 to VOUT and a resistor R1 to VREF pin yields the output voltage:
VOUT = -(R2/R1 ) x VREF
(*4)：When using an external PNP bipolar transistor, connect a resistor R3 from this pin to DHI. R3 value
depends on VIN, inductor and PNP bipolar transistor. By adjusting the R3 value, efficiency can be
optimized.
(*5)：Connect to base of the PNP bipolar transistor.
(*6)：This pin clamps the switch peak current to prevent over-current damage to the external switch.
The RCL resistor equation:
R = V / I = 100mV(CL Threshold) / 100mA(the current(100mA) depend on user)
R= 1Ω, (so the RCL resistor use 1Ω).
APPLICATION CIRCUIT
Figure 1. Application schematic for negative LCD contrast BIOS power supply
Lyontek Inc. reserves the rights to change the specifications and products without notice.
5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
2
®
LY1152
Rev. 1.2
Inverting DC/DC Controller (SOP)
ORDERING INFORMATION
LY 1 152 VV
VV : PACKAGE TYPE
SL : 8-PIN SOP
PRODUCT NAME
A : PRODUCT LINE
LY : LYONTEK PRODUCT NUMBER PREFIX
ABSOLUTE MAXIMUM RATINGS*
PARAMETER
Supply Voltage
SYMBOL
VDD
RATING
7.0
UNIT
V
℃
Operating Temperature
Storage Temperature
TA
-40 to 85 (I grade)
-65 to 150
125
℃
TSTG
℃
Junction Temperature
TJMAX
TSOLDER
℃
Soldering Temperature (under 10 sec)
260
ELECTRICAL CHARACTERISTICS (VIN=5.0V, TA = 25℃)
Refer to Typical Application Circuit.
TEST CONDITION
MIN.
2.4
TYP.
-
MAX. UNIT
PARAMETER
Input voltage
-
7.0
V
Quiescent Current
Shutdown Current
Shutdown Threshold
CL Threshold
VREF Voltage
VFB = -50mV
VSHUTDOWN = 0V
-
-
-
-
-
-
-
90
-
uA
A
µ
V
mV
V
0.1
1.5
100
1.22
-
1.0
-
-
-
-
VREF Source Current
-
250
uA
Lyontek Inc. reserves the rights to change the specifications and products without notice.
5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
3
®
LY1152
Rev. 1.2
Inverting DC/DC Controller (SOP)
TYPICAL PERFORMANCE CHARACTERISTICS
Fig.1 Shutdown Current vs Vin
Fig.2 Efficiency vs Vin
Fig.3 Frequency vs Vin
Fig.4 Duty Cycle vs Vin
Lyontek Inc. reserves the rights to change the specifications and products without notice.
5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
4
®
LY1152
Rev. 1.2
Inverting DC/DC Controller (SOP)
PACKAGE OUTLINE DIMENSION
8-PIN SOP (150 mil) PACKAGE OUTLINE DIMENSION：
Lyontek Inc. reserves the rights to change the specifications and products without notice.
5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
5
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