CAT3661 - 1-Channel Low-Power LED Driver

CAT3661
1-Channel Low-Power LED
Driver
Description
VIN
ADJH
ADJL
GND
RSET
1
C1−
nFLTB
C1+
nFLTL
C2+
EN
C2−
VOUT
Charge Pump: 1x, 1.33x, 1.5x, 2x
Drives One LED up to 5 mA
Optimized for Coin Cell Battery Operation
Open/Short LED Fault Detection
Adjustable Low Battery Detection
Low Quiescent Current 150 mA Typical
Power Efficiency up to 92%
Low Noise Input Ripple in All Modes
“Zero” Current Shutdown Mode
Soft Start and Short Circuit Current Limiting
Thermal Shutdown Protection
3 mm x 3 mm, 16−pad TQFN Package
This Device is Pb−Free, Halogen Free/BFR Free and is RoHS
Compliant
PIN CONNECTIONS
NC
•
•
•
•
•
•
•
•
•
•
•
•
•
TQFN−16
HV3 SUFFIX
CASE 510AD
NC
Features
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LED
The CAT3661 is a high efficiency low power fractional charge
pump that drives one LED with up to 5 mA of current. Soft−start
current limiting and short−circuit protection are optimized for use with
coin cell batteries.
Low noise input ripple and constant switching frequency allows the
use of small external ceramic capacitors. This makes the CAT3661
ideal for EMI sensitive applications. The charge pump supports a wide
range of input voltages from 2.0 V to 5.5 V.
The CAT3661 has a built−in circuitry to provide feedback to a
microcontroller of Open/Short LED and Low battery events. The Low
battery indicator trip point is internally fixed at 2.4 V. External
resistors can be added to raise or lower the trip voltage, if needed.
The device is packaged in the tiny 16−lead TQFN 3 mm x 3 mm
package with a max height of 0.8 mm.
The inclusion of a 1.33x fractional charge pump mode increases
device efficiency by up to 10% over traditional 1.5x tri−mode charge
pumps with no added external capacitors. The 1.33x charge pump with
two fly capacitors is a patented architecture exclusive to
ON Semiconductor.
(Top View)
See detailed description of the pins function on
page 8 of this data sheet.
MARKING DIAGRAM
JAAU
AXXX
YWW
JAAU = CAT3661HV3−GT2
A = Assembly Location
XXX = Last Three Digits of Assembly Lot Number
Y = Production Year (Last Digit)
WW = Production Week (Two Digits)
Typical Applications
• Low Power LCD Display Backlight
• Low Power Handheld Device Backlight
© Semiconductor Components Industries, LLC, 2014
August, 2014 − Rev. 2
ORDERING INFORMATION
See detailed ordering and shipping information on page 2 of
this data sheet.
1
Publication Order Number:
CAT3661/D
CAT3661
1 mF
1 mF
VIN
1 mF
1 MW
1 mF
1 MW
LED
Low Battery Fault
LED Fault
ON/OFF
60 kW
Figure 1. Typical Application Circuit
Table 1. ORDERING INFORMATION
Part Number
CAT3661HV3−GT2
Lead Finish
Package
Shipping†
NiPdAu
TQFN
(Pb−Free)
2000 / Tape & Reel
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
Table 2. ABSOLUTE MAXIMUM RATINGS
Parameter
Value
Unit
VIN voltage
GND−0.3 to 6
V
VOUT voltage
GND−0.3 to 7
V
EN, nFLTB, nFLTL, LED, RSET voltage (Note 1)
GND−0.3 to 6
V
C1±, C2± voltage
GND−0.3 to 7
V
Storage Temperature Range
−65 to +160
°C
Junction Temperature Range
−40 to +150
°C
Lead Temperature
300
°C
ESD Rating HBM (Human Body Model)
2000
V
ESD Rating MM (Machine Model)
200
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.
1. EN, nFLTL, nFLTB, LED and RSET can be driven above VIN up to the absolute maximum voltage.
Table 3. RECOMMENDED OPERATING CONDITIONS
Parameter
Value
Unit
VIN
2.0 to 5.5
V
Ambient Temperature Range
−40 to +85
°C
0.1 to 5
mA
0 to 1
mA
1.3 to 4.2
V
LED current
nFLTB, nFLTL pull−up resistor current
LED Forward Voltage Range (VF)
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.
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CAT3661
Table 4. ELECTRICAL OPERATING CHARACTERISTICS
(Recommended operating conditions unless otherwise specified. CIN, COUT−, CFLY are 1 mF ceramic capacitors and VIN is set to 3.6 V)
Conditions
Parameter
Symbol
Min
Max
1x mode, no load, VIN = 3.4 V
1.33x mode, no load, VIN = 3.0 V
1.5x mode, no load, VIN = 2.4 V
2x mode, no load, VIN = 2.1 V
Shutdown Current
VEN = 0 V
LED Current Accuracy (Chip to Chip)
(ILED − ILEDNOM ) / ILEDNOM
LED Current Accuracy
RSET = 60 kW
Gain (ILED / IRSET)
ILED = 3 mA
Gain
RSET Regulated Voltage
ILED = 3 mA
VRSET
Output Resistance (open loop)
1x mode
1.33x mode, VIN = 3 V
1.5x mode, VIN = 2.7 V
2x mode, VIN = 2.4 V
ROUT
15
40
50
100
W
Charge Pump Frequency
1.33x and 2x mode
1.5x mode
FOSC
100
130
kHz
Input Current Limit Gain from IRSET
ILED = 3 mA
GI_MAX
1000
LED Channel Short Detection Voltage
ILED = 3 mA
VSH
1
LED Channel Short Test Current
VOUT – VLED < VSH
ISH
5
mA
LED Channel Open/Short Timeout
ILED = 3 mA
TOLED
2
ms
IQSHDN
mA
1
ILED−ACC
ILED−3
1x to 1.33x or 1.33x to 1.5x or 1.5x to 2x
Transition Thresholds at LED pin
2.7
3
mA
%
±2
3.3
mA
0.63
V
300
0.57
0.6
V
LEDTH
mV
100
ILED = 3 mA
Transition Filter Delay
nFLTB, nFLTL low voltage threshold
(Open Drain)
130
160
160
160
Unit
Quiescent Current
1x Mode Transition Hysteresis
IQ
Typ
nFLTB, nFLTL Driven low 100 mA
pull up
EN Pin
− Internal Pull−down Resistor
− Logic High Level
− Logic Low Level
VHYS
360
mV
TDF
400
ms
VFLTLO
REN
VEHI
VELO
1.3
TSD
150
Thermal Hysteresis
THYS
20
ADJH = VIN
ADJL = GND
VLB
2.30
Low Battery ADJ Trip Point (Internal)
Low Battery Divider Network Resistance
VIN = 2.4 V
VADJ
RHI + RLO
RADJ
Low Battery Resistor Divider Gain
(RHI + RLO) / RLO
GADJ
Low battery nFLTB Pulse Duration
Upon EN, VIN = 2.4 V
Undervoltage lockout (UVLO) threshold
TBATTLO
VUVLO
V
0.4
kW
V
V
200
Thermal Shutdown
Low battery Vin Trip point Voltage
0.2
_C
_C
2.40
2.50
V
0.57
0.6
0.63
V
640
800
960
kW
600
ms
4
400
500
1.9
V
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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CAT3661
TYPICAL CHARACTERISTICS
(VIN = 3 V, ILED = 3 mA, VF = 3 V, TAMB = 25°C, typical application circuit unless otherwise specified.)
6.5
2x
1.33x
180
1x
160
1.5x
140
120
5.5
5.0
1.5x
4.5
1.33x
4.0
3.5
3.4
3.2
3.0
2.8
2.6
2.4
2.2
3.0
2.0
1x
3.4
3.2
3.0
2.8
2.6
2.4
2.2
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Figure 2. Quiescent Current vs. Input Voltage
Figure 3. Total Supply Current vs. Input
Voltage
2.0
8
7
LED CURRENT (mA)
6 mA
6
5
4
3 mA
3
2
6
4
2
1
0
0
50
100
150
200
250
0
300
10
100
LED PIN VOLTAGE (mV)
RSET RESISTANCE (kW)
Figure 4. LED Current vs. LED Pin Voltage
Figure 5. LED Current vs. RSET
1.4
1.2
ENABLE VOLTAGE (V)
LED CURRENT (mA)
2x
6.0
200
SUPPLY CURRENT (mA)
QUIESCENT CURRENT (mA)
220
25°C
−40°C
1.0
0.8
85°C
0.6
0.4
0.2
0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
INPUT VOLTAGE (V)
Figure 6. Enable Voltage vs. Input Voltage
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5.5
CAT3661
TYPICAL CHARACTERISTICS
(VIN = 3 V, ILED = 3 mA, VF = 3 V, TAMB = 25°C, typical application circuit unless otherwise specified.)
140
2x
200
1.5x
175
1.33x
150
1x
125
−40
0
40
80
120
40
80
120
Figure 7. Quiescent Current vs. Temperature
Figure 8. Switching Frequency vs.
Temperature
2.0
1.6
1.5
1.2
0.8
0.4
0
−0.4
−0.8
−1.2
2.0
2.5
3.0
3.5
4.0
4.5
5.0
VF = 3 V
1.0
0.5
0
−0.5
−1.0
−1.5
−2.0
−40
5.5
0
40
80
120
INPUT VOLTAGE (V)
TEMPERATURE (°C)
Figure 9. LED Current Change vs. Input
Voltage
Figure 10. LED Current Change vs.
Temperature
100
90
1.33x
1.5x
1.5x
90
EFFICIENCY (%)
1x
80
70
60
2x
50
40
0
TEMPERATURE (°C)
2.0
−1.6
−2.0
1.33x, 2x
100
TEMPERATURE (°C)
100
EFFICIENCY (%)
1.5x
80
−40
120
LED CURRENT VARIATION (%)
LED CURRENT CHANGE (%)
SWITCHING FREQUENCY (kHz)
QUIESCENT CURRENT (mA)
225
4.0
3.5
3.0
2.5
80
70
60
2x
50
VF = 3 V
4.5
1.33x
40
2.0
VF = 3 V
3.2
3.0
2.8
2.6
2.4
2.2
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Figure 11. Efficiency vs. Input Voltage
Figure 12. Efficiency vs. Lithium Coin Cell
Voltage
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2.0
CAT3661
TYPICAL CHARACTERISTICS
(VIN = 3 V, ILED = 3 mA, VF = 3 V, TAMB = 25°C, typical application circuit unless otherwise specified.)
Figure 13. Power Up in 1x Mode
Figure 14. Power Up in 1.33x Mode
Figure 15. Power Up in 1.5x Mode
Figure 16. Power Up in 2x Mode
Figure 17. Operating Waveforms in 1x Mode
Figure 18. Operating Waveforms in 1.33x
Mode
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CAT3661
TYPICAL CHARACTERISTICS
(VIN = 3 V, ILED = 3 mA, VF = 3 V, TAMB = 25°C, typical application circuit unless otherwise specified.)
Figure 19. Operating Waveforms in 1.5x Mode
Figure 20. Operating Waveforms in 2x Mode
Figure 21. Open LED
Figure 22. LED Pin Shorted to VOUT
Figure 23. Enable with Low Battery
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CAT3661
Table 5. PIN DESCRIPTION
Pin No.
Pin Name
Description
1
RSET
Connect resistor RSET to set the LED current
2
nFLTB
Battery Fault output, Open drain output. (Active low)
3
nFLTL
LED Fault output, Open drain output. (Active low)
4
EN
Device enable (Active high)
5
LED
LED cathode terminal
6
NC
Not connected inside the package
7
NC
Not connected inside the package
8
VOUT
9
C2−
Bucket capacitor 2 Negative terminal
10
C2+
Bucket capacitor 2 Positive terminal
11
C1+
Bucket capacitor 1 Positive terminal
12
C1−
Bucket capacitor 1 Negative terminal
13
VIN
Positive supply connection to battery
14
ADJH
Battery trip point threshold adjust high
15
ADJL
Battery trip point threshold adjust low
16
GND
Ground supply connection
TAB
GND
Connect to GND on the PCB
Charge pump output connected to the LED anodes
Pin Functions
TAB is the exposed pad underneath the package. For best
thermal performance, the tab should be soldered to the PCB
and connected to the ground plane.
RSET is connected to a resistor (RSET) to set the full scale
current for the LEDs. The voltage at this pin regulated to
0.6 V. The ground side of the external resistor should be star
connected back to the GND of the PCB. In shutdown mode,
RSET becomes high impedance.
nFLTL is an active low open−drain output that provides a
fault flag for an open/short LED condition. If used, this pin
requires a pull−up resistor.
nFLTB is an active low open−drain output that provides a
fault flag for a low battery condition. If used, this pin
requires a pull−up resistor. nFLTB and nFLTL can be
shorted together for one Fault output (ORed function).
ADJH is an external connection to the top of the low battery
sense resistor divider network. This pin should be shorted to
VIN if a trip point of 2.4 V is required.
ADJL is an external connection to the bottom of the low
battery sense resistor divider network. This pin should be
shorted to GND if a trip point of 2.4 V is required.
VIN is the supply pin for the device. A small 1 mF ceramic
bypass capacitor is required between the VIN pin and
ground near the device.
EN is the device enable pin. Levels of logic high and logic
low are set at 1.3 V and 0.4 V respectively to enable
interface to low voltage controllers. EN pin is compatible
with voltages higher than VIN.
VOUT is the charge pump output that is connected to the
LED anodes. A small 1 mF ceramic bypass capacitor is
required between the VOUT pin and ground near the device.
GND is the ground reference for the charge pump. This pin
must be connected to the ground plane on the PCB.
C1+, C1− are connected to each side of the ceramic bucket
capacitor C1.
C2+, C2− are connected to each side of the ceramic bucket
capacitor C2.
LED provides the internal regulated current source for the
LED cathode. This pin enters high−impedance ‘zero’
current state whenever the device is placed in shutdown
mode.
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CAT3661
Block Diagram
Figure 24. CAT3661 Functional Block Diagram
Basic Operation
mode is called the 1x mode transition hysteresis (VHYS) and
is about 300 mV.
At power−up, the CAT3661 starts operating in 1x mode
where the output will be approximately equal to the input
supply voltage (less any internal voltage losses). If the
output voltage is sufficient to regulate the LED current, the
device remains in 1x operating mode.
If the input voltage is insufficient or falls to a level where
the LED regulated current cannot be maintained, the device
automatically switches into 1.33x mode (after a fixed delay
time of about 400 ms). In 1.33x mode, the output voltage is
approximately equal to 1.33 times the input supply voltage
(less any internal voltage losses).
This sequence repeats in the 1.33x and 1.5x mode until the
driver enters the 2x mode. In 1.5x mode, the output voltage
is approximately equal to 1.5 times the input supply voltage.
While in 2x mode, the output is approximately equal to 2
times the input supply voltage.
If the device detects a sufficient input voltage is present to
drive the LED current in 1x mode, it will change
automatically back to 1x mode. This only applies for
changing back to the 1x mode. The difference between the
input voltage when exiting 1x mode and returning to 1x
LED Current Setting
The current flowing out of the RSET pin to ground mirrors
the current in the LED channel with a gain of 300. The LED
current can be adjusted from 0.1 mA to 5 mA. Connecting
a resistor between RSET and GND allows a reference
current to flow due to the voltage on the RSET pin being
regulated to 0.6 V. The internal gain of the current mirror is
300. It is possible to calculate the current in the LED channel
by the following equation:
I LED +
0.6 V
R SET
300
Adjustable Battery Indicator
The CAT3661 contains an adjustable low battery
indicator that is active when the device is enabled. If the
voltage on the internal resistor divider trip point node is less
than VADJ (0.6 V), the nFLTB output is driven low and
remains low for 500 ms after the EN pin is driven high. The
CAT3661 will still function normally below this voltage
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CAT3661
For VLB > 2.4 V, use RL = 0 W and
RH (kW) ≅ 200 (VLB/0.6 – 1) − 600
range. Extra external resistors can be added to the top or
bottom of the internal resistor divider network to alter the
divider ratio gain factor. The low battery indicator trip point
can be calculated by the following formula:
V LB + V ADJ
For VLB < 2.4 V, use RH = 0 W and
RL (kW) ≅ 600 (0.6/(VLB – 0.6)) – 200
Figure 26 shows the external resistor value for low battery
voltage trip points (VLB) between 2 V and 3.2 V. For VLB
above 2.4 V, RL = 0 W. For VLB below 2.4 V, RH = 0 W.
G ADJ
VLB = Low Battery Voltage Trip Point
VADJ = Low Battery Comparator Trip point (0.6 V)
GADJ = Resistor Divider Gain (4 internally)
To obtain a low battery trip point of 2.4 V, the ADJH pin
is shorted to VIN, and the ADJL pin is tied to GND.
To increase the low battery trip point, insert a resistor
between ADJH and VIN. To consequently lower the low
battery trip point, insert a resistor between ADJL and GND.
The following formula shows how to calculate the modified
resistor divider gain:
240
RESISTOR (kW)
200
R ADJ ) R H
G ADJM +
(R ADJńG ADJ) ) R L
160
120
RH
80
RL
40
GADJM = Modified resistor divider gain
0
RADJ = Total resistance of divider (800 kW typ.)
RH = High external resistor (ADJH to VIN)
RL = Low external resistor (ADHL to GND)
2.0
2.2
2.4
2.6
2.8
3.0
3.2
TRIP POINT VOLTAGE (V)
Figure 26. VLB vs. RH & RL
The low battery trip point does not operate for adjustments
below 2.0 V VIN.
The inclusion of the ADJH pin allows monitoring of
supplies other than the supply to the CAT3661. Simply
connect ADJH pin directly to the supply to be monitored and
the low battery indicator will function as normal when the
device is enabled. When EN is low, no current will flow in
the resistor divider network allowing ‘zero’ current
shutdown mode.
Under Voltage Lockout
If the voltage on VIN is less than VUVLO threshold, the
nFLTB output is driven low and the device enters a low
power state where the LED output is off.
When the device is in shutdown (EN low), the nFLTB pin
will float high to ‘zero’ current state.
Figure 25. Application Circuit with RH & RL
The resistance required for a certain trip point voltage can
be calculated by rearranging the above equations with
respect to RH or RL.
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CAT3661
Protection Mode
Lithium coin cell batteries have high internal resistances
so a robust current limit is a very important feature of the
device to prevent large voltage droops from triggering
device resets during operation of the CAT3661.
Open LED Protection
An LED is deemed open circuit if the LED current sink is
unable to regulate the LED channel to the programmed
current for greater than 2 ms. The driver will sense this
condition and the nFLTL pin will be driven low. The device
will be placed into a standby−mode until the Open LED
condition is removed or the device is re−enabled (EN goes
low then high again) at which point the Open LED condition
will be evaluated.
Over Voltage, Over Temperature Protection
As soon as VOUT is pumped above 4.5 V, the driver will
stop advancing modes if the LED sink is not in regulation.
This indicates a possible Open LED condition and stops the
device from seeing excessive voltages on the output pin
greater than the absolute maximum ratings for VOUT. An
additional fail safe over−voltage detector prevents the
VOUT output from ever exceeding 6.5 volts.
If the die temperature exceeds +150°C, the driver will
enter a thermal protection shutdown mode and the LED will
be turned off. The nFLTL pin will be driven low. Once the
device temperature drops by about 20°C, the device will
resume normal operation and nFLTL will be floated high.
Short LED Protection
An LED is deemed to be short circuit if the difference
between VOUT pin and LED pin is less than 1.0 V when the
programmed current is driven in the channel for greater than
2 ms. If this is the case, then the LED sink is turned off and
a 5 mA test current is placed in the channel. The nFLTL pin
is driven low. Once the short condition is removed normal
operation will resume and nFLTL will be floated high.
When the device is shutdown (EN low), the nFLTL pin
will float high to ‘zero’ current state.
External Components
The driver requires four external 1 mF ceramic capacitors
for decoupling input, output, and for the charge pump “fly”
capacitors. Capacitors type X5R and X7R are recommended
for the LED driver application. In all charge pump modes,
the input current ripple is kept very low by design and an
input bypass capacitor of 1 mF is sufficient. In 1x mode, the
device operates in linear mode and does not introduce
switching noise back onto the supply.
Input Current Limiting
The charge pump contains an input current limit circuit
that limits the current through the input pin. The current is
limited to 1000 times (GI_MAX) the current flowing in
RSET. Use the following formula:
I MAX +
0.6 V
R SET
1000
LED Selection
LEDs with forward voltages (VF) ranging from 1.3 V to
4.2 V may be used. Selecting LEDs with lower VF is
recommended in order to improve the efficiency by keeping
the driver in 1x mode longer as the battery voltage decreases.
For example, if a white LED with a VF of 3.3 V is selected
over one with VF of 3.5 V, the driver will stay in 1x mode to
a lower supply voltage of 0.2 V. This helps improve the
efficiency and extends battery life.
The input current limit insures the battery is never loaded
with more than 3.3 times the LED current during a short
circuit condition, Charge Pump startup condition or charge
pump mode change. The device will only ever use a
maximum of 2 times the programmed LED current plus
quiescent operating current when in normal 2x mode of
operation.
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CAT3661
PACKAGE DIMENSIONS
TQFN16, 3x3
CASE 510AD
ISSUE A
A
D
e
b
L
E2
E
PIN#1 ID
PIN#1 INDEX AREA
A1
TOP VIEW
SIDE VIEW
SYMBOL
MIN
NOM
MAX
A
0.70
0.75
0.80
A1
0.00
0.02
0.05
A3
BOTTOM VIEW
0.20 REF
b
0.18
0.25
0.30
D
2.90
3.00
3.10
D2
1.40
−−−
1.80
E
2.90
3.00
3.10
E2
1.40
−−−
1.80
e
L
D2
A
A3
A1
FRONT VIEW
0.50 BSC
0.30
0.40
0.50
Notes:
(1) All dimensions are in millimeters.
(2) Complies with JEDEC MO-220.
2. All packages are RoHS−compliant (Lead−free, Halogen−free).
3. The standard lead finish is NiPdAu.
ON Semiconductor and the
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at www.onsemi.com/site/pdf/Patent−Marking.pdf. SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation
or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and
specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets
and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each
customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended,
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