LD7523
1
8
2
3
4
7
6
5
TOP MARK YYWWPP
B N O
C O M P
N C
C S
+
0.85V +
1
1
1
Absolute Maximum Ratings
Supply Voltage VCC -0.3V~30V
COMP, BNO, CS -0.3V ~7V
OUT -0.3V ~Vcc+0.3V
Maximum Junction Temperature 150°C
Operating Ambient Temperature Range -40°C to 85°C
Operating Junction Temperature Range -40°C to 125°C
Storage Temperature Range -65°C to 150°C
Package Thermal Resistance (SOP-8) 160°C/W
Package Thermal Resistance (DIP-8) 100°C/W
Power Dissipation (SOP-8, at Ambient Temperature = 85°C) 400mW
Power Dissipation (DIP-8, at Ambient Temperature = 85°C) 650mW
Lead temperature (Soldering, 10sec) 260°C
ESD Voltage Protection, Human Body Model 2.5KV
ESD Voltage Protection, Machine Model 250V
Gate Output Current 500mA
Caution:
Stresses beyond the ratings specified 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.
Electrical Characteristics
(T A = +25o C unless otherwise stated, V CC =12.0V)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Supply Voltage (VCC Pin) Startup Current
20
35
μA
V COMP =0V 3.5 mA
V COMP =3V 2.7 mA Operating Current (with 1nF load on OUT pin) Protection Mode (note 1) 0.70 mA UVLO (off) 9.0 9.75 10.7 V UVLO (on)
12.0
12.75
13.5
V
Voltage Feedback (Comp Pin) Short Circuit Current
V COMP =0V 2.5 4.0 mA Green Mode Threshold VCOMP
2.35
V
Current Sensing (CS Pin)
V BNO =0V (note 2)
0.80
0.85
0.90
V
V BNO =1.30V 0.748 0.798 0.848 V
Maximum Input Voltage, V CS(OFF)
V BNO =3.75V 0.650 0.700 0.750 V
Leading Edge Blanking Time 350 nS Input impedance 1 NA M Ω Delay to Output
200
nS
Gate Drive Output (OUT Pin) Output Low Level V CC =15V, Io=20mA 1.0 V Output High Level V CC =15V, Io=20mA
9.0 V Rising Time V CC =15V,Load Cap.=1000pF 50 160 nS Falling Time V CC =15V ,Load Cap.=1000pF
30
60
nS
Oscillator Frequency
60 65 70 KHz Green Mode Frequency
20
KHz
Frequency Temp. Stability (-40°C –85°C) 3 % Frequency Voltage Stability
(VCC=12V-30V)
1
%
Electrical Characteristics (Continued)
(T A = +25o C unless otherwise stated, V CC=12.0V)
UNITS
MAX PARAMETER CONDITIONS
MIN
TYP Brownout Protection & Line Compensation (BNO Pin)
Brownout Turn-On Trip Level 1.20 1.25 1.30 V
Brownout Turn-Off Trip Level 1.05 1.10 1.15 V
V
5.0
Saturation Voltage on LINE Pin I BNO<1.5uA
Line Compensation Ratio 0.04 V/V
Over Voltage Protection (OVP Pin)
Level 2.35 2.50 2.65 V Trip
OVP
OVP de-bounce time 200 μS
V
5.0
Saturation Voltage on OVP Pin I OVP<1.5uA
OLP (Over Load Protection)
V
5.5
5.0
OLP Trip Level V COMP(OLP) 4.5
60
mS OLP Delay Time V COMP>5.0V
OLP De-Latch Counter 500 mS
Soft Start
Soft Start Duration 5 7.5 10 mS Note 1: When OVP, OLP Protection is tripped.
Note 2: Guaranteed by design because Vcs(off) can’t be measured when V BNO=0V.
∑Fig. 23
)1
2R R Non-Switching Fig. 29
Summary of Protections
There are several ways to control the on/off of LD7523.
The details are listed as the table below.
Turn
Off
Operation
COMP Comp Pin <
1.4V
Cycle by Cycle Mode
Non-latch
OLP Comp Pin > 5.0V
OVP OVP Pin >
2.5 V
Hiccup Mode
Non-latch
Re-start after next
UVLO(on)
Brownout BNO Pin <
1.25V with
Hysteresis
Cycle by cycle mode
Non-latch
Table 1
Package Information
SOP-8
Dimensions in Millimeters Dimensions in Inch
Symbols
MIN MAX MIN MAX
A 4.801 5.004 0.189 0.197
B 3.810 3.988 0.150 0.157
C 1.346 1.753 0.053 0.069
D 0.330 0.508 0.013 0.020
F 1.194 1.346 0.047 0.053
H 0.178 0.229 0.007 0.009
I 0.102 0.254 0.004 0.010
J 5.791 6.198 0.228 0.244
M 0.406 1.270 0.016 0.050
θ0° 8° 0° 8°
Package Information
DIP-8
Dimension in Millimeters Dimensions in Inches
Symbol
Min Max Min Max
A 9.017 10.160 0.355 0.400
B 6.096 7.112 0.240 0.280
C ----- 5.334 ------ 0.210
D 0.356 0.584 0.014 0.023
E 1.143 1.778 0.045 0.070
F 2.337 2.743 0.092 0.108
I 2.921 3.556 0.115 0.140
J 7.366 8.255 0.29 0.325
L 0.381 ------ 0.015 --------
Important Notice
Leadtrend Technology Corp. reserves the right to make changes or corrections to its products at any time without notice. Customers should verify the datasheets are current and complete before placing order.
Revision History
Rev. Date Change Notice
00 6/16/2009 Original Specification.