MAX1577Z [MAXIM]
1.2A White LED Regulating Charge Pump for Camera Flashes and Movie Lights;
| 型号： | MAX1577Z |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 1.2A White LED Regulating Charge Pump for Camera Flashes and Movie Lights |
| 文件： | 总11页 (文件大小：670K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-3461; Rev 0; 11/04
1.2A White LED Regulating Charge Pump for
Camera Flashes and Movie Lights
General Description
Features
The MAX1577Y/MAX1577Z charge pumps drive white
LEDs, including camera strobes, with regulated current
up to 1.2A (guaranteed to 800mA). The very low open-
loop output resistance allows high flash brightness,
even from a low battery input voltage. The adaptive
1x/2x regulating charge-pump operation provides high
efficiency (up to 92%) while in movie mode or back-
lighting. Fast (1MHz) switching allows the use of tiny
external components.
♦ Up to 1.2A Output Drive Capability (800mA
Guaranteed)
♦ Up to 92% P
/ P
Efficiency for Movie
BATT
LED
Mode
♦ Flexible Brightness Control
Two-Bit Logic for 100%, 33%, 20%, and Off
PWM for 20% to 100%
♦ 3% Current Regulation Over Line and
Temperature
♦ Current or Voltage Regulation for Flash and
Backlighting (MAX1577Y)
♦ Current Regulation for Flash (MAX1577Z)
The MAX1577Y/MAX1577Z use an external resistor to
set the full-scale LED current. Two enable inputs (EN1
and EN2) provide simple on/off control and LED current
of 20%, 33%, or 100% full scale. If there is less than
24mV across the external resistor, the output voltage is
regulated. The MAX1577Z has fixed 5.1V output-volt-
age regulation, while the MAX1577Y has logic-con-
trolled output voltage of 3.4V, 4.6V, or 5.1V for
backlighting, keyboard, and RGB applications.
♦ Low Ripple and EMI
♦ 2.7V to 5.5V Supply Voltage Range
♦ Soft-Start Limits Inrush Current
♦ Output-Voltage Regulation Mode
♦ Thermal-Shutdown Protection
♦ 8-Pin 3mm x 3mm TDFN Package
The MAX1577Y/MAX1577Z are available in an 8-pin,
3mm x 3mm TDFN package (0.8mm max height).
Applications
White LED Flashes, Strobes, and Movie Lights
Ordering Information
LCD Backlighting
PIN-
PACKAGE
TOP
MARK
PART
TEMP RANGE
Camera Phones, Cell Phones, and Smart Phones
PDAs, Digital Cameras, and Camcorders
8 TDFN
(T833-2)
MAX1577YETA
-40°C to +85°C
AMG
AMQ
8 TDFN
(T833-2)
MAX1577ZETA
-40°C to +85°C
Typical Operating Circuit
Pin Configuration
1µF OR 2.2µF
TOP VIEW
8
7
6
5
CP
IN
CN
UP TO 1.2A
5.3V OVP
10µF
2.7V TO 5.5V
OUT
4.7µF
GND
MAX1577Y
MAX1577Z
MAX1577Z
V
OUT
- (300mV OR
100mV OR 60mV)
100%,
33%, 20%,
AND
CS
EN1
EN2
1
2
3
4
SHUTDOWN
TDFN
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1.2A White LED Regulating Charge Pump for
Camera Flashes and Movie Lights
ABSOLUTE MAXIMUM RATINGS
IN, OUT, EN1, EN2 to GND...................................-0.3V to +6.0V
Continuous Power Dissipation (T = +70°C)
A
OUT to GND During Shutdown....................-0.3V to (V + 0.3V)
OUT to CS .............................................................-0.6V to +0.6V
8-Pin TDFN (derate 18.2mW/°C above +70°C) ..........1455mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
IN
CS to GND................................................-0.3V to (V
+ 0.3V)
OUT
CN to GND...................................................-0.3V to (V + 0.3V)
IN
CP to GND .....-0.3V to the Greater of (V
+ 1V) or (V + 1V)
OUT
IN
OUT Short Circuit to GND ..........................................Continuous
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
IN
(V = 3.6V, circuit of Figure 2, EN1 = EN2 = IN, R = 60Ω, C = 4.7µF, C1 = 2.2µF, C
= 10µF, T = -40°C to +85°C, unless
A
CS
IN
OUT
otherwise noted. Typical values are at T = +25°C.) (Note 1)
A
PARAMETER
CONDITIONS
MIN
2.7
TYP
MAX
5.5
UNITS
IN Operating Voltage
V
V
Undervoltage-Lockout Threshold
Undervoltage-Lockout Hysteresis
V
rising
2.3
2.45
35
2.6
IN
mV
1MHz switching, no load
5
Supply Current
mA
µA
1x LDO mode, no switching
0.225
0.01
0.2
0.3
1
T
T
= +25°C
= +85°C
A
Shutdown Supply Current
EN1 = EN2 = GND
A
Soft-Start Time
0.5
ms
V
OUT Overvoltage Protection
5.3
MAX1577Z, T = +25°C,
A
EN1 or EN2 = IN
4.95
5.10
5.25
I
= 100mA
OUT
OUT Voltage Regulation Mode
EN1 = GND, EN2 = IN
EN1 = IN, EN2 = GND
EN1 = EN2 = IN
3.17
4.40
4.95
3.40
4.60
5.10
3.60
4.80
5.25
V
MAX1577Y, T = +25°C,
A
I
= 100mA
OUT
CS Voltage-Mode Threshold
24
mV
mV
(V
OUT
- V
CS
)
EN1 = GND, EN2 = IN
EN1 = IN, EN2 = GND
EN1 = EN2 = IN
60
100
300
0.5
CS Regulation Voltage
(V - V
)
CS
OUT
T
A
= +25°C
-2
-3
+2
+3
CS Threshold Accuracy
Maximum OUT Current
Open-Loop OUT Resistance
%
mA
Ω
V
= 2.7V to 5.5V, T = -40°C to +85°C
A
IN
V
V
= 3.1V
= 3.4V
600
800
900
1200
0.6
2
IN
IN
V
= 4.1V, EN1 = EN2 = IN
LED
1x LDO mode
2x mode, V = 3.4V
IN
3
OUT Internal Pulldown in
Shutdown
EN1 = EN2 = GND
5
kΩ
Switching Frequency
0.80
1.0
1.25
MHz
2
_______________________________________________________________________________________
1.2A White LED Regulating Charge Pump for
Camera Flashes and Movie Lights
ELECTRICAL CHARACTERISTICS (continued)
(V = 3.6V, circuit of Figure 2, EN1 = EN2 = IN, R = 60Ω, C = 4.7µF, C1 = 2.2µF, C
= 10µF, T = -40°C to +85°C, unless
A
IN
CS
IN
OUT
otherwise noted. Typical values are at T = +25°C.) (Note 1)
A
PARAMETER
EN_ Logic-High Voltage
EN_ Logic-Low Voltage
Logic Input Current
CONDITIONS
MIN
1.6
TYP
MAX
UNITS
V
V
V
= 4.2V to 5.5V
= 2.7V to 4.2V
= 2.7V to 5.5V
IN
IN
IN
V
V
1.4
0.4
1
T
T
= +25°C
= +85°C
0.02
0.02
+160
20
A
V
= 0V or 5.5V
µA
EN_
A
Thermal-Shutdown Threshold
Thermal-Shutdown Hysteresis
T rising
J
°C
°C
Note 1: Limits are 100% production tested at T = +25°C. Limits over the operating temperature range are guaranteed by design.
A
Typical Operating Characteristics
(V = 3.6V, circuit of Figure 2, R = 0.27Ω, Luxeon LXCL-PWF1 LED, T = +25°C, unless otherwise noted.)
IN
CS
A
LED CURRENT vs. SUPPLY VOLTAGE
EFFICIENCY vs. SUPPLY VOLTAGE
BATTERY CURRENT vs. SUPPLY VOLTAGE
1200
100
90
80
70
60
50
40
30
20
10
0
2500
2000
1500
1000
500
R
= 0.27Ω
R
= 0.27Ω
CS
CS
1000
800
600
400
200
0
1100mA AT 3.78V
F
1100mA AT 3.78V
F
370mA AT 3.33V
F
370mA AT 3.33V
F
220mA AT 3.15V
F
220mA AT 3.15V
F
370mA AT 3.33V
F
1100mA AT 3.78V
F
R
= 0.27Ω
220mA AT 3.15V
CS
F
0
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
SUPPLY VOLTAGE (V)
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
SUPPLY VOLTAGE (V)
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
SUPPLY VOLTAGE (V)
LED CURRENT vs. SUPPLY VOLTAGE
BATTERY CURRENT vs. SUPPLY VOLTAGE
EFFICIENCY vs. SUPPLY VOLTAGE
900
800
700
600
500
400
300
200
100
0
1800
1600
1400
1200
1000
800
100
90
80
70
60
50
40
30
20
10
0
770mA AT 3.66V
F
R
= 0.39Ω
CS
770mA AT 3.66V
F
770mA AT 3.66V
F
250mA AT 3.21V
F
250mA AT 3.21V
F
600
150mA AT 3.06V
250mA AT 3.21V
F
F
150mA AT 3.06V
F
400
200
R
= 0.39Ω
CS
150mA AT 3.06V
R
= 0.39Ω
F
CS
0
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
SUPPLY VOLTAGE (V)
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
SUPPLY VOLTAGE (V)
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
SUPPLY VOLTAGE (V)
_______________________________________________________________________________________
3
1.2A White LED Regulating Charge Pump for
Camera Flashes and Movie Lights
Typical Operating Characteristics (continued)
(V = 3.6V, circuit of Figure 2, R = 0.27Ω, Luxeon LXCL-PWF1 LED, T = +25°C, unless otherwise noted.)
IN
CS
A
TYPICAL OPERATING WAVEFORMS
LED CURRENT vs. TEMPERATURE
LED CURRENT vs. R
IN 1x MODE
CS
MAX1577 toc09
225
220
215
210
205
200
1.2
1.0
0.8
0.6
0.4
0.2
0
50mV/div
(AC-COUPLED)
V
EN1 AND EN2 HIGH
IN
50mV/div
(AC-COUPLED)
V
OUT
EN1 HIGH, EN2 LOW
EN1 LOW, EN2 HIGH
50mV/div
(AC-COUPLED)
V
CS
R
= 0.27Ω
CS
EN1 LOW
EN2 HIGH
-40
-15
10
35
60
85
0.2
0.4
0.6
(Ω)
0.8
1.0
400ns/div
TEMPERATURE (°C)
R
CS
TYPICAL OPERATING WAVEFORMS
IN 2x MODE
STARTUP AND SHUTDOWN RESPONSE
MAX1577 toc10
MAX1577 toc11
V
V
EN1,
EN2
2V/div
50mV/div
(AC-COUPLED)
V
IN
50mV/div
(AC-COUPLED)
V
2V/div
0V
OUT
V
LED
50mV/div
(AC-COUPLED)
V
CS
I
500mA/div
0mA
LED
400ns/div
400µs/div
EFFICIENCY vs. SUPPLY VOLTAGE
WITH PWM DIMMING
LED CURRENT vs. PWM DUTY CYCLE
DIMMING RESPONSE
MAX1577 toc14
80
70
60
50
40
30
20
10
0
1200
1000
800
600
400
200
0
V
V
2V/div
EN1
LED
25%
2V/div
0V
50%
75%
R
= 0.27Ω
R
= 0.27Ω
CS
CS
I
LED
500mA/div
0mA
EN1 PWM
EN2 HIGH
EN1 PWM
EN2 HIGH
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
SUPPLY VOLTAGE (V)
0
20
40
60
80
100
100µs/div
DUTY CYCLE (%)
4
_______________________________________________________________________________________
1.2A White LED Regulating Charge Pump for
Camera Flashes and Movie Lights
Pin Description
PIN
NAME
FUNCTION
1
EN1
Control Logic Input (see Table 1)
Transfer Capacitor Positive Connection. Connect a 1µF capacitor (or 2.2µF for I
CP to CN.
> 600mA) from
OUT
2
3
CP
CN
Transfer Capacitor Negative Connection. Connect a 1µF capacitor (or 2.2µF for I
CP to CN.
> 600mA) from
OUT
4
5
EN2
Control Logic Input (see Table 1)
Ground
GND
Input Supply Voltage. Connect IN to a battery or supply voltage from 2.7V to 5.5V. Connect a 4.7µF
ceramic capacitor from IN to GND.
6
7
IN
Current-Sense Input. Connect a current-sense resistor from OUT to CS to set the output current.
Connect the anodes of the LEDs to CS and the cathodes to GND.
CS
Output. Connect a 10µF ceramic capacitor from OUT to GND. In shutdown, OUT is pulled to GND
with an internal 5kΩ resistor.
8
OUT
EP
—
Exposed Pad. Connect the exposed pad to GND directly under the IC.
Table 1. Enable, Dimming, Voltage Mode, and Overvoltage Protection
VOLTAGE MODE
MAX1577Z MAX1577Y
OVP
CS THRESHOLD
(V - V
EN1
EN2
DIMMING LEVEL
)
CS
OUT
MAX1577Z
—
MAX1577Y
—
0
0
1
1
0
1
0
1
Shutdown
20% Current
33% Current
100% Current
—
—
—
60mV
5.10V
5.10V
5.10V
3.40V
4.60V
5.10V
5.30V
5.30V
5.30V
5.15V
5.17V
5.30V
100mV
300mV
Note: A “0” indicates EN_ is logic low or connected to GND. A “1” indicates EN_ is logic high or connected to IN.
_______________________________________________________________________________________
5
1.2A White LED Regulating Charge Pump for
Camera Flashes and Movie Lights
C1
1µF*
CP
CN
OUT
IN
2.7V TO 5.5V
LDO/CHARGE PUMP
C
4.7µF
IN
C
OUT
10µF
GND
ERROR
AMP
CSVMODE
V
OUT
- V
CS
EN1
EN2
CONTROL
MAX1577Y
ONLY
R
CS
IMODE/
VMODE
1.25V
MUX
MAX1577Y
MAX1577Z
CS
D1
24mV
*2.2µF FOR MORE THAN 600mA OUTPUT.
Figure 1. Functional Diagram
6
_______________________________________________________________________________________
1.2A White LED Regulating Charge Pump for
Camera Flashes and Movie Lights
C1
2.2µF*
CP
IN
CN
R
CS
UP TO 1.2A
5.3V OVP
2.7V TO 5.5V
OUT
OR
C
C
OUT
IN
4.7µF
10µF
GND
MAX1577Z
V
OUT
- (300mV OR
100mV OR 60mV)
CS
EN1
EN2
100%, 33%, 20%,
AND SHUTDOWN
*1µF FOR LESS THAN 600mA OUTPUT.
Figure 2. Current Regulation with the MAX1577Z
C1
1µF
CP
CN
OUT
5.1V, 4.6V, OR 3.4V
2.7V TO 5.5V
IN
C
C
OUT
IN
4.7µF
10µF
GND
MAX1577Y
CS
EN1
EN2
5.1V, 4.6V, 3.4V
AND SHUTDOWN
Figure 3. Voltage Regulation with the MAX1577Y
_______________________________________________________________________________________
7
1.2A White LED Regulating Charge Pump for
Camera Flashes and Movie Lights
C1
2.2µF*
CP
IN
CN
5.3V OVP UP TO 1.2A
5.1V, 4.6V, OR 3.4V
2.7V TO 5.5V
OUT
C
C
IN
IN
4.7µF
10µF
R
CS
GND
MAX1577Y
V
- (300 OR
OUT
100 OR 60mV)
5.1V OR 100% CURRENT,
4.6V OR 33% CURRENT,
3.4V OR 20% CURRENT,
AND SHUTDOWN
CS
EN1
EN2
RGB DRIVER
ASIC
MAIN DISPLAY
BACKLIGHT
SUBDISPLAY
BACKLIGHT
CAMERA-FLASH
MOVIE LIGHT
*1µF FOR LESS THAN 600mA OUTPUT.
Figure 4. Flash and Backlighting with the MAX1577Y
start is terminated and normal operation begins in 1x
mode. Otherwise, after 500µs, the 2x charge-pump soft-
start operates until the voltage across the sense resistor
reaches the current regulation threshold, the output volt-
age is in regulation, or 500µs has elapsed, whichever
occurs first. If the output is shorted to ground, soft-start
is repeated until the output exceeds 2.3V.
Detailed Description
1x LDO to 2x Mode Switchover
When V
is greater than V
, the MAX1577Y/
OUT
IN
MAX1577Z are in 1x LDO mode and regulate the cur-
rent through R . As V decreases and the LDO
CS
IN
approaches dropout, the 2x charge pump starts boosting
the output to maintain the regulation current. When V
IN
Dimming and Shutdown
The MAX1577Y/MAX1577Z use two inputs (EN1 and
EN2) to select between three brightness levels and low-
power shutdown mode (see Table 1). By regulating the
rises enough above V
to maintain LDO regulation, the
OUT
charge pump stops and the MAX1577Y/MAX1577Z
switch back to the more efficient 1x LDO mode.
Soft-Start
The MAX1577Y/MAX1577Z include soft-start circuitry to
limit inrush current at turn-on. When starting up with an
output voltage that is not near the input voltage, the out-
put capacitor is charged directly from the input with a
ramped current source (with no charge-pump action)
until the output voltage approaches the input voltage. If
current-mode or voltage-mode regulation is met, soft-
voltage across the current-sense resistor (V
- V ) to
CS
OUT
one of three levels, the MAX1577Y/MAX1577Z control the
output current, thus providing the three-level dimming. In
shutdown mode, the IC is turned off, reducing the supply
current to 0.01µA (typ). When the MAX1577Y/MAX1577Z
are shut down, C1 is discharged and the output is pulled
to GND through an internal 5kΩ resistor.
8
_______________________________________________________________________________________
1.2A White LED Regulating Charge Pump for
Camera Flashes and Movie Lights
Overvoltage Protection
Applications Information
Output overvoltage protection (OVP) protects the IC
Setting the Output Current
For applications requiring a regulated output current,
see the circuit of Figure 2. The output regulation current
and other components in case the output is open cir-
cuit. The MAX1577Z always limits the output voltage to
5.3V. With the MAX1577Y, the output OVP voltage
varies slightly depending on the state of the EN_ inputs
(see Table 1).
is set by R as follows:
CS
R
CS
= (V
- V ) / I
OUT CS OUT
where I
OUT
is the output current (up to 1200mA) and
OUT
Output-Voltage Regulation Mode
(V
- V ) is the current-sense threshold (see Table 1).
CS
When the voltage across the sense resistor (V
CS
-
OUT
V
) is less than 24mV, the MAX1577Y/MAX1577Z reg-
For camera-flash applications with a short pulse dura-
tion, a 0.25W resistor is recommended.
ulate the output voltage. For applications requiring a
fixed output voltage instead of current regulation, sim-
ply connect CS directly to OUT as shown in Figure 3.
The MAX1577Z regulates to a fixed 5.1V. The
adjustable regulation voltage (3.4V, 4.6V, or 5.1V) of
the MAX1577Y depends on the state of the EN_ inputs
(see Table 1).
Setting the Output Voltage
To regulate the output voltage instead of the current,
connect CS directly to the output as shown in Figure 3.
In this configuration the MAX1577Z regulates the output
to 5.1V. The output voltage of the MAX1577Y is set to
5.1V, 4.6V, or 3.4V using the EN1 and EN2 inputs as
shown in Table 1.
Thermal Protection
Thermal protection prevents damage to the IC during
overload conditions. When the die temperature
exceeds +160°C, the MAX1577Y/MAX1577Z turn off
until the die cools by 20°C. Once the die has cooled,
the MAX1577Y/MAX1577Z turn on and initiate soft-start.
During a continuous overload, this produces a pulsed
output. Continous operation at high-output-current set-
tings may induce thermal protection.
Driving Camera Strobe/Flash
In applications that do not require dimming, such as a
camera strobe/flash, connect EN1 and EN2 together
and drive as a single on/off control input. Pulse this
input high to generate a strobe output.
PWM Dimming
To vary the brightness from 20% to 100% using pulse-
width modulation (PWM), hold EN2 high and apply the
PWM signal (up to 5kHz) to EN1. Holding EN2 high
keeps the part enabled and prevents repeated soft-
starts. The duty cycle of the PWM signal applied to EN1
controls the brightness, where 0% duty cycle corre-
sponds to 20% brightness and 100% duty cycle corre-
sponds to 100% brightness. A PWM signal with a
logic-high voltage between 1.6V and 5.5V can be safe-
ly used regardless of the input voltage. The voltage of
the PWM signal does not affect the brightness level.
Capacitor Selection
Ceramic capacitors are recommended due to their low
equivalent series resistance (ESR), small size, and low
cost. Select capacitors that maintain their capacitance
over temperature and DC bias. Typically X5R, X7R, or
better ceramic capacitors perform well.
A 4.7µF input capacitor and 10µF output capacitor are
recommended for most applications. Larger values can
be used to reduce ripple.
For the transfer capacitor (C1), a 1µF capacitor is suit-
able for output currents up to 600mA. For output cur-
rents between 600mA and 1200mA, use a 2.2µF
capacitor.
For highest movie-mode efficiency, it is best to choose
CS
movie-mode current. Then, the flash current level is
adjusted by the PWM duty cycle. When the movie-
mode current is more than 33% of the flash current, it is
more efficient to apply the PWM dimming signal to EN2
while holding EN1 high.
R
so 0% PWM duty cycle provides the desired
Input Ripple
In 1x LDO mode there is no charge-pump switching,
and thus very little input ripple. The input ripple in 2x
charge-pump mode depends on the input source
impedance. Typical waveforms showing the ripple in 1x
and 2x mode are in the Typical Operating
Characteristics. In sensitive applications, increase the
input capacitance to reduce input ripple.
Ballast Resistors for Multiple LEDs
When using multiple parallel LEDs, add a ballast resis-
tor in series with each LED to help balance the current
between the LEDs. When using current regulation
_______________________________________________________________________________________
9
1.2A White LED Regulating Charge Pump for
Camera Flashes and Movie Lights
(Figure 2), the ballast resistors must be small enough to
prevent triggering the overvoltage protection:
Note that V varies as a function of I
. Typically, LED
F
LED
manufacturers provide a plot of forward voltage (V ) vs.
F
forward current (I
) in the LED data sheet.
LED
R
< (5.1V - V ) / I
F LED
BALLAST
where I
is the current through each LED and V is
F
PC Board Layout and Routing
LED
the forward voltage of the LED at I
. Within this limit,
The MAX1577Y/MAX1577Z are high-frequency
switched-capacitor regulators. For best circuit perfor-
LED
larger values of R
improve LED-to-LED match-
BALLAST
ing but also increase the input voltage where the 2x
charge pump makes the transition to the more efficient
1x LDO mode.
mance, use a solid ground plane and place C , C
,
IN
OUT
and C1 as close to the IC as possible. Connect the
exposed pad to GND directly under the IC and allow suf-
ficient copper area for cooling. Refer to the MAX1577Z
evaluation kit for an example PC board layout.
When using voltage regulation (Figure 3), select the
ballast resistors based on the full brightness setting as
follows:
Chip Information
TRANSISTOR COUNT: 2482
With EN1 high and EN2 high:
R
= (5.1V - V ) / I
F LED
PROCESS: BiCMOS
BALLAST
The LED current at the dimmed settings are calculated
as follows:
with EN1 high and EN2 low:
I
= (4.6V - V ) / R
F
LED
BALLAST
with EN1 low and EN2 high:
= (3.4V - V ) / R
I
LED
F
BALLAST
10 ______________________________________________________________________________________
1.2A White LED Regulating Charge Pump for
Camera Flashes and Movie Lights
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages.)
D
N
PIN 1
INDEX
AREA
E
E2
DETAIL A
C
C
L
L
L
L
A
e
e
PACKAGE OUTLINE, 6, 8, 10 & 14L,
TDFN, EXPOSED PAD, 3x3x0.80 mm
1
NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY
21-0137
F
2
COMMON DIMENSIONS
SYMBOL
MIN.
0.70
2.90
2.90
0.00
0.20
MAX.
0.80
3.10
3.10
0.05
0.40
A
D
E
A1
L
k
0.25 MIN.
0.20 REF.
A2
PACKAGE VARIATIONS
PKG. CODE
T633-1
N
6
D2
E2
e
JEDEC SPEC
b
[(N/2)-1] x e
1.50 0.10 2.30 0.10 0.95 BSC
1.50 0.10 2.30 0.10 0.65 BSC
MO229 / WEEA
MO229 / WEEC
0.40 0.05
0.30 0.05
1.90 REF
1.95 REF
2.00 REF
2.40 REF
2.40 REF
T833-1
8
T1033-1
T1433-1
T1433-2
10
14
14
1.50 0.10 2.30 0.10 0.50 BSC MO229 / WEED-3 0.25 0.05
1.70 0.10 2.30 0.10 0.40 BSC
1.70 0.10 2.30 0.10 0.40 BSC
- - - -
- - - -
0.20 0.03
0.20 0.03
PACKAGE OUTLINE, 6, 8, 10 & 14L,
TDFN, EXPOSED PAD, 3x3x0.80 mm
2
21-0137
F
2
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11
© 2004 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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