1.5MHz, 500mA STEP-UP DC-DC CONVERTER
Figure 1. Package Type of KT6860
The KT6860 is available in The KT6860 has built-in overvoltage protection (OVP)The KT6860 is a high power, constant frequency, cur-Aug.060
1
General Description
rent mode PWM, inductor bad, step-up (boost) con-verter. The converter operates at high frequency
(1.5MHz) so that a small, low profile inductor can be ud.
to allow the device goes into shutdown mode when the output voltage exceeds the OVP threshold of 29V .standard SOT-23-5 pack-age.
Features
·High Efficiency up to 81%
·Adjustable Output V oltage up to 29V ·Shutdown Current 1µA Typical · 1.5MHz Switching Frequency
·36V 500mA Rugged Integrated Bipolar Switch ·Built-in Soft-start to Reduce Inrush Current Dur-ing Start-up
·On-chip Overvoltage Protection
·Us Low ESR Ceramic Output Capacitor ·土豆片做法
Us Small Inductor
Applications
·LCD/OLED Display Bias Supply
·White LED Driver for LCD Display Backlights ·
Cellular Phones
SOT-23-5
208Rev.1.4
KT
68
Figure 2. Pin Configuration of KT6860 (Top View)
2
Pin Description
Pin Number
Pin Name Function
1
SW
Switch Pin. Connect inductor/diode here. The output voltage can go up to 29V but should not exceed this limit. If the voltage on this pin is higher than the overvoltage protection (OVP)threshold, the device can go into shutdown mode. It can be restarted by a low to high pul on the SHDN pin, or by a power on ret on the V IN supply 2GND Ground Pin. Connect directly to local ground plane
3
FB
Feedback Pin. Internally compares to 1.25V . Connect R1 and R2 resistor divider here. Calcu-late the Output V oltage according to the formula: V OUT =1.25V * (1+R1/R2)
4SHDN Shutdown Pin. Connect to 1.5V or higher to enable device (ON), 0.4V or lower to disable
device (OFF)
5
V IN
Input Supply Pin. Must be locally bypasd
Pin Configuration
K Package
(SOT-23-5)
SW FB
V IN
SHDN
GND Aug.060
208Rev.1.4
KT 68
Figure 12. LCD/OLED Display Bias Driver Typical Circuit
感情的话
Note: V OUT =1.25*(1+R1/R2)=1.25*19.2=24V
C: X5R or X7R Dielectric
L: SUMIDA CDTH3D14/HPNP-100NC or Equivalent
3
Functional Block Diagram
FB SHDN
V IN
Aug.060
208Rev.1.4
KT 68number, are RoHS compliant. Products with KT6860KTRP KT6860KTRG E6B
G Tape & Reel
Lead Free
Ordering Information
Package
Temperature Range
Part Number
Marking ID
Packing Type
Lead Free
电脑开机时间查询Green
Lead Free
Green
SOT-23-5
-40 to 85o C
K: SOT-23-5
G: Green
TR: Tape & Reel
Package Type灿若夏花
P
"G" suffix are available in green packages.
signated with "P" suffix in the part KINETEIC's Pb-free products, as de
4
Aug.0208Rev.1.4林永哲
使命是什么
Note 1: Stress greater than tho listed under "Absolute Maximum Ratings" may cau permanen
t damage to the device. The are stress ratings only, and functional operation of the device at the or any other conditions beyond tho indicated under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Max-imum Ratings" for extended periods may affect device reliability.
Parameter Symbol Min Max Unit Input V oltage V IN 2.616V
Operating Temperature
T OP
-40
85
o
C
Recommended Operating Conditions
Absolute Maximum Ratings (Note 1)
Parameter Symbol Value Unit Input V oltage V IN
20V SW V oltage 38V FB V oltage 5V SHDN V oltage
16
V
Thermal Resistance (Junction to Atmosphere, no Heat sink) R θJA
265o
C/W
Operating Junction Temperature 150
o C Storage Temperature Range T STG -65 to 150o C Lead Temperature (Soldering, 10c)T LEAD
260o
C
ESD (Machine Model)250V ESD (Human Body Model)
2000
V
Electrical Characteristics
(V IN=3V, V SHDN=3V, T A=25o C, unless otherwi specified.)
Parameter Symbol Conditions Min Typ Max Unit
2.6V
Minimum Operating V olt-
age
16V Maximum Operating V olt-
标准隶书字帖
age
Feedback V oltage V FB V IN=5V, V OUT=24V, I OUT=30mA 1.17 1.25 1.33V
FB Pin Bias Current V FB=1.25V1045100nA
Supply Current I CC V SHDN =V FB=V IN, No switching 2.5 3.5mA
Supply Current I Q V SHDN =0V, V FB=0V0.1 1.0µA
Switching Frequency f 1.1 1.5 1.9MHz
Maximum Duty Cycle D MAX8590%
Switching Current Limit Duty Cycle=80%500mA
Switch VCESAT V CESAT I SW=250mA300mV
好看的英文网名Switch Leakage Current V SW=5V0.015µA
SHDN V oltage High (ON)V TH 1.5
V SHDN V oltage Low (OFF)V TL0.4
SHDN Pin Bias Current55µA
OVP V oltage Threshold V OVP29V
Soft-Start Time550µS
5
208Rev.1. Aug.0
