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CAT32 PDF даташит

Спецификация CAT32 изготовлена ​​​​«ON Semiconductor» и имеет функцию, называемую «CMOS White LED Driver».

Детали детали

Номер произв CAT32
Описание CMOS White LED Driver
Производители ON Semiconductor
логотип ON Semiconductor логотип 

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CAT32 Даташит, Описание, Даташиты
CAT32
CMOS White LED Driver
Description
The CAT32 is a DC/DC step up converter that delivers a regulated
output current. Operation at a constant switching frequency of
1.2 MHz allows the device to be used with very small value external
inductor and ceramic capacitors.
The CAT32 is targeted to drive multiple white light−emitting diodes
(LEDs) connected in series and provides the necessary regulated current
to control the brightness and the color purity. An external resistor RSET
controls the output current level. LED currents of up to 40 mA can be
supported over a wide range of input supply voltages from 2 V to 7 V,
making the device ideal for battery−powered applications.
A high voltage output stage allows up to 4 White LEDs to be driven
in series. Series drive provides inherent current matching.
LED dimming can be done by using a DC voltage, a logic signal, or
a pulse width modulation (PWM) signal. The shutdown input pin
allows the device to be placed in power−down mode with “near zero”
quiescent current.
In addition to overcurrent limiting protection, the device also
includes detection circuitry to ensure protection against open−circuit
load fault conditions.
The device is available in a low profile (1 mm max height) 6−lead
TSOT−23 package.
Features
Low Quiescent Ground Current (0.5 mA Typical)
Power Efficiency Over 80%
Compatible Pinout with LT1932
Adjustable Output Current (up to 40 mA)
High Frequency 1.2 MHz Operation
Input Voltage Operation down to 2.0 V
Low Resistance (0.5 W) High Voltage Power Switch
Drives up to 4 White LEDs in Series
Shutdown Current Less than 1 mA
Load Fault Protection Against Open−circuits
Low Value External Components
Low Profile (1 mm) TSOT−23 6−lead Package
These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Applications
Color LCD and Keypad Backlighting
Cellular Phones
Handheld Terminals
Digital Cameras
PDAs/Games
Portable MP3 Players
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TSOT−23
TD SUFFIX
CASE 419AF
PIN CONNECTIONS
1
SW
VIN
GND
SHDN
LED RSET
TSOT−23
1 mm Maximum Height
qJA = 250°C/W (free air)
(Top View)
MARKING DIAGRAMS
VFYM
VF = CAT32TDI−GT3
Y = Production Year (Last Digit)
M = Production Month (1−9, A, B, C)
ORDERING INFORMATION
Device
Package
Shipping
CAT32TDI−GT3
TSOT−23
(Pb−Free)
3,000/
Tape & Reel
© Semiconductor Components Industries, LLC, 2014
April, 2014 − Rev. 5
1
Publication Order Number:
CAT32/D









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CAT32 Даташит, Описание, Даташиты
CAT32
Typical Application Circuit
VIN
2.7 V
to
4.2 V
C1
4.7 mF
L1 6.8 mH
D1
61
VIN SW
PWM
DIMMING
CONTROL
TSOT−23 Pin Numbers
CAT32
5
SHDN
3
LED
RSET
4
RSET
1.50 kW
GND
2
15 mA
C1: Taiyo Yuden JMK212BJ475
C2: Taiyo Yuden EMK212BJ105
D1: Zetez ZHCS400
L1: Sumida CLQ4D106R8
(Panasonic ELJEA6R8)
C2
1 mF
Figure 1. Li−Ion Driver for Four High−Brightness White LEDs
Table 1. PIN DESCRIPTION
Pin Number
SOT23
Pin Number
TDFN
18
25
36
44
53
62
−1
Name
SW
GND
LED
RSET
SHDN
VIN
Power
Ground
Function
Switch pin. This is the drain of the internal power switch. For minimum EMI, min-
imize the trace area connected to this pin.
Ground pin. Connect pin 2 to ground.
LED (cathode) connection pin.
RESET pin. A resistor connected from pin 4 to ground sets the LED current. This
pin is also used to dim the LEDs.
Shutdown pin.
Input supply pin. This pin should be bypassed with a capacitor to ground. A
4.7 mF capacitor mounted close to the pin is recommended.
Power Ground
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CAT32 Даташит, Описание, Даташиты
CAT32
Table 2. ABSOLUTE MAXIMUM RATINGS
Parameter
Rating
Unit
VIN, LED, SHDN voltage
SW voltage
8V
20 V
RSET voltage
1V
Storage Temperature Range
−65 to +150
°C
Junction Temperature
125 °C
Lead Soldering Temperature (10 secs)
300 °C
ESD Rating – Human Body Model
2000
V
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality
should not be assumed, damage may occur and reliability may be affected.
Table 3. RECOMMENDED OPERATING CONDITIONS
Parameter
Range
Unit
VIN
Ambient Temperature Range
2 to 7
−40 to +85
V
°C
Inductor L1
6.8 ±20% typical
mH
Input Capacitor C1
4.7 ±20% typical
mF
Output Capacitor C2
1.0 ±20% typical
mF
ILED with 1 to 4 LEDs in series
0 to 20
mA
Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond
the Recommended Operating Ranges limits may affect device reliability.
NOTE: Typical application circuit with external components is shown on page 2.
Table 4. ELECTRICAL OPERATING CHARACTERISTICS
(Over recommended operating conditions unless otherwise specified. TA = 25°C, VIN = 2 V and VSHDN = 1.2 V.)
Symbol
Parameter
Conditions
Min Typ Max Unit
IQ
IGND
VLED
ILED
ILED
Quiescent Current
Ground Current in Shutdown
LED Pin Voltage
LED Current Adjust Range
Programmed LED Current
ILED
VRSET
LED Pin Current Temperature Coefficient
RSET Pin Voltage
Shutdown Pin Logic High Level
VRSET = 0.2 V
VSHDN = 0 V
VIN < VOUT, ILED = 15 mA
RSET = 562 W
RSET = 750 W
RSET = 1.5 kW
RSET = 4.53 kW
ILED = 15 mA
RSET = 1.5 kW
0.5 0.7 mA
0.05 1
mA
120 180 mV
5 40 mA
33 38 45 mA
25 30 36
12.5 15 17.5
5
−0.01
mA/°C
100 mV
0.85 V
Shutdown Pin Logic Low Level
0.25 V
fSW
ISWL
RSW
Boost Converter Frequency
Switch Current Limit
Switch Resistance
Switch Leakage Current
Efficiency
0.8 1.2 1.6 MHz
400 550 780 mA
VIN = 2 V, ISW = 100 mA
VIN = 3 V, ISW = 100 mA
Switch Off, VSW = 5 V
Components shown on Figure 1
0.7 1.2
0.5 0.9
0.01 5
83
W
mA
%
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product
performance may not be indicated by the Electrical Characteristics if operated under different conditions.
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