CAT3616
6-Channel Charge Pump
LED Driver with EZDimt
Description
The CAT3616 is a high efficiency 1x/1.5x fractional charge pump
with programmable dimming current in six LED channels. To ensure
uniform brightness in LCD backlight applications, each LED channel
delivers an accurate regulated current.
Low noise and input ripple is achieved by operating at a constant
switching frequency of 1 MHz which allows the use of small external
ceramic capacitors. The 1x/1.5x fractional charge pump supports a
wide range of input voltages from 3 V to 5.5 V with efficiency up to
91%, and is ideal for Li−Ion battery powered devices.
Two groups of LEDs, main (MAIN1 to MAIN4) and sub (SUB1 and
SUB2) are programmable through the ENM (active low) and ENS
inputs. Independent current from 1 mA to 31 mA with a 1 mA step are
set by toggling the ENM and ENS inputs. The enable EN input pin
allows to shutdown the device with zero quiescent current.
The device is available in a 16−pad TQFN package with a max
height of 0.8 mm.
Features
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TQFN−16
HV4 SUFFIX
CASE 510AE
PIN CONNECTIONS
MAIN2
MAIN3
MAIN4
SUB1
MAIN1
ENM
ENS
EN
1
TAB
is
GND
VOUT
VIN
C1−
C1+
(Top View)
SUB2
GND
C2+
C2−
•
•
•
•
•
•
•
•
•
•
•
•
•
•
6 LED Channels with Tight Matching
Independent Main and Sub Channels
1−wire EZDimt Programmable LED Current
Accurate 1 mA Dimming Level
Power Efficiency up to 91%
Fractional Pump 1x/1.5x
Low Noise Input Ripple
Fixed High Frequency Operation 1 MHz
“Zero” Current Shutdown Mode
Soft Start and Current Limiting
Short Circuit Protection
Thermal Shutdown Protection
16−pad TQFN 4 mm x 4 mm Package
These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Main and Sub−display Backlight
Color LCD and Keypad Backlighting
Cellular Phones
Handheld Devices
Digital Cameras
MARKING DIAGRAMS
G616
AXXX
YMCC
CDAH
AXXX
YMCC
G616 = CAT3616HV4−T2
CDAH = CAT3616HV4−GT2
A = Assembly Location
XXX = Last Three Digits of Assembly Lot Number
Y = Production Year (Last Digit)
M = Production Month (1-9, A, B, C)
CC = Country of Origin (Two Digit)
Note: Two digit code for country of origin:
Thailand = TH
Malaysia = MY
Applications
•
•
•
•
•
ORDERING INFORMATION
Device
CAT3616HV4−T2
(Note 1)
CAT3616HV4−GT2
(Note 2)
Package
TQFN−16
(Pb−Free)
TQFN−16
(Pb−Free)
Shipping
2,000/
Tape & Reel
2,000/
Tape & Reel
1. Matte−Tin Plated Finish (RoHS−compliant).
2. NiPdAu Plated Finish (RoHS−compliant).
1
Publication Order Number:
CAT3616/D
©
Semiconductor Components Industries, LLC, 2010
April, 2010
−
Rev. 3
CAT3616
NOTE: Unused LED channels must be connected to VOUT.
Figure 1. Typical Application Circuit
Table 1. ABSOLUTE MAXIMUM RATINGS
Parameter
VIN, LEDxx voltage
VOUT, C1±, C2± voltage
EN, ENM, ENS voltage
Storage Temperature Range
Junction Temperature Range
Lead Temperature
Rating
6
7
VIN + 0.7 V
−65
to +160
−40
to +150
300
Unit
V
V
V
°C
°C
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
Table 2. RECOMMENDED OPERATING CONDITIONS
Parameter
VIN
Ambient Temperature Range
I
LED
per LED pin
IOUT Total Output Current
NOTE:
Typical application circuit with external components is shown above.
Range
3 to 5.5
−40
to +85
0 to 31
0 to 150
Unit
V
°C
mA
mA
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CAT3616
Table 3. ELECTRICAL OPERATING CHARACTERISTICS
Symbol
I
Q
Parameter
Quiescent Current
VIN = 3.6 V, EN = High, ambient temperature of 25°C (over recommended operating conditions unless specified otherwise)
Conditions
1x mode, all LEDs Off
1x mode, all LEDs On
1.5x mode, all LEDs Off
V
EN
= 0 V
0
1 mA
≤
I
LED
≤
31 mA
(I
LED
−
I
LEDAVG
) / I
LEDAVG
1x mode, I
OUT
= 120 mA
1.5x mode, I
OUT
= 120 mA
0.8
V
OUT
< 0.5 V
1x mode, V
OUT
> 1 V
−1
1.3
165
20
2
±3
±3
0.5
2.2
1
60
300
1
0.4
1.3
Min
Typ
0.5
2.2
3.5
0
1
31
Max
Unit
mA
I
QSHDN
I
LED
I
LED−ACC
I
LED−DEV
R
OUT
F
OSC
I
SC_MAX
I
IN_MAX
I
EN/DIM
V
HI
V
LO
T
SD
T
HYS
V
UVLO
Shutdown Current
LED Current Range with 6 LEDs
LED Current Accuracy
LED Channel Matching
Output Resistance (open loop)
Charge Pump Frequency
Output short circuit Current Limit
Input Current Limit
EN/DIM Pin
−
Input Leakage
−
Logic High Level
−
Logic Low Level
Thermal Shutdown
Thermal Hysteresis
Undervoltage lock out (UVLO) threshold
mA
mA
%
%
W
MHz
mA
mA
mA
V
V
°C
°C
V
Table 4. RECOMMENDED EN, ENM AND ENS TIMING
Symbol
T
SETP
T
LO
T
HI
T
OFF
T
D
T
DEC
Parameter
EN setup from shutdown
ENM, ENS program low time
ENM, ENS program high time
EN low time to shutdown
LED current enable
LED current decrement
(For 3 V
≤
VIN
≤
5.5 V, over full ambient temperature range
−40
to +125°C.)
Conditions
Min
10
0.3
0.3
1.5
40
0.1
200
Typ
Max
Unit
ms
ms
ms
ms
ms
ms
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CAT3616
(VIN = 3.6 V, IOUT = 90 mA (6 LEDs at 15 mA), EN = VIN, ENM = ENS = GND,
C
IN
= C1 = C2 = C
OUT
= 1
mF,
T
AMB
= 25°C, unless otherwise specified.)
100
90
EFFICIENCY (%)
80
70
60
50
40
EFFICIENCY (%)
1x Mode
15 mA per LED
100
90
VIN = 4 V (1x Mode)
80
70
60
50
40
VIN = 3.2 V (1.5x Mode)
TYPICAL CHARACTERISTICS
20 mA per LED
1.5x Mode
4.2
4.0
3.8
3.6
3.4
3.2
3.0
0
50
100
150
200
INPUT VOLTAGE (V)
TOTAL LED CURRENT (mA)
Figure 3. Efficiency vs. Input Voltage
(6 LEDs On)
0.8
QUIESCENT CURRENT (mA)
QUIESCENT CURRENT (mA)
0.8
Figure 4. Efficiency vs. Total LED Current
(6 LEDs)
0.6
0.6
0.4
6 LEDs OFF
0.2
0.4
6 LEDs OFF
0.2
0
3.0
3.2
3.4
3.6
3.8
4.0
4.2
0
−40
0
40
TEMPERATURE (°C)
80
120
INPUT VOLTAGE (V)
Figure 5. Quiescent Current vs. Input Voltage
(1x Mode)
5
QUIESCENT CURRENT (mA)
4
3
2
6 LEDs OFF
1
0
QUIESCENT CURRENT (mA)
5
4
3
2
Figure 6. Quiescent Current vs. Temperature
(1x Mode)
6 LEDs OFF
1
0
−40
3.0
3.2
3.4
3.6
3.8
4.0
4.2
0
40
TEMPERATURE (°C)
80
120
INPUT VOLTAGE (V)
Figure 7. Quiescent Current vs. Input Voltage
(1.5x Mode)
Figure 8. Quiescent Current vs. Temperature
(1.5x Mode)
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