MAX8630Y.pdf 데이터시트 (총 12 페이지) - 파일 다운로드 MAX8630Y 데이타시트 다운로드

No Preview Available !

www.DataSheet4U.com
19-3689; Rev 1; 2/07
EVAALVUAAILTAIOBNLEKIT
125mA 1x/1.5x Charge Pumps for
5 White LEDs in 3mm x 3mm TDFN
General Description
The MAX8630Y/MAX8630Z charge pumps drive up to 5
white LEDs with regulated constant current up to 125mA
total. By utilizing adaptive 1x/1.5x charge-pump modes
and very low-dropout current regulators, they achieve
high efficiency over the full 1-cell Li+ battery input volt-
age range. The 1MHz fixed-frequency switching allows
for tiny external components, and the regulation scheme
is optimized to ensure low EMI and low input ripple. An
integrated derating function protects the LEDs from
overheating during high ambient temperatures.
The MAX8630Y/MAX8630Z are factory trimmed for full-
scale LED current options of 15mA, 18mA, 20mA, and
25mA. The MAX8630Z uses two enable inputs (ENM for
3 main LEDs and ENS for 2 sub LEDs) for simple on/off
control and single-wire, serial-pulse dimming in 32 linear
steps. The MAX8630Y uses a single direct PWM input
(PWM) to control all 5 LEDs with DC current proportional
to the PWM duty cycle. If both ENM and ENS (or PWM)
are kept low for more than 4ms, the MAX8630_ enters
shutdown. The MAX8630Y/MAX8630Z are available in a
14-pin, 3mm x 3mm TDFN package (0.8mm max height).
Applications
Display Backlight (Up to 5 LEDs)
Main (3 LEDs) + Sub (2 LEDs) Displays
Cell Phones and Smartphones
PDAs, Digital Cameras, and Camcorders
Typical Operating Circuit
Features
93% Max/85% Avg. Efficiency (PLED/PBATT) Over
Li+ Battery Discharge
1% LED Current Accuracy
125mA Total Drive Capability
Adaptive 1x/1.5x Mode Switchover
Single-Wire, Serial-Pulse Dimming (MAX8630Z)
Independent On/Off/Dimming for Main and Sub
Linear—Full, 31/32nd, 30/32nd, … 1/32nd
Direct-PWM Dimming (MAX8630Y)
15, 18, 20, and 25mA Full-Scale Versions
Low 0.1µA Shutdown Current
Soft-Start Eliminates Inrush Current
Output Overvoltage Protection
Thermal-Derating Function Protects LEDs
14-Pin, 3mm x 3mm TDFN Package
Ordering Information
PART
PIN-
PACKAGE
TOP
MARK
PKG
CODE
MAX8630YETD15+T
14 TDFN
(3mm x 3mm)
AAS
T1433-2
Note: All devices are specified to operate over the -40°C to
+85°C operating temperature range.
+Denotes a lead-free package.
Ordering Information continued at end of data sheet.
Selector Guide appears at end of data sheet.
Pin Configuration
INPUT
2.7V TO 5.5V
1μF
ENABLE MAIN
ON/OFF AND
DIMMING
ENABLE SUB
ON/OFF AND
DIMMING
1μF
C1P C1N
IN OUT
GND MAX8630Z
LED1
LED2
ENM LED3
LED4
ENS LED5
C2P C2N
OUTPUT
1μF
MAIN
SUB
TOP VIEW
14 13 12 11 10 9 8
MAX8630Y
MAX8630Z
1234567
1μF
TDFN
3mm × 3mm
( ) ARE FOR MAX8630Y
________________________________________________________________ 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.

No Preview Available !

www.DataSheet4U.com
125mA 1x/1.5x Charge Pumps for 5 White LEDs
in 3mm x 3mm TDFN
ABSOLUTE MAXIMUM RATINGS
IN, OUT to GND.....................................................-0.3V to +6.0V
C1N, C2N, ENM, CPWM, ENS,
PWM to GND ............................................-0.3V to (VIN + 0.3V)
LED_ to GND ............................................-0.3V to (VOUT + 0.3V)
C1P, C2P to GND ...-0.3V to greater of (VOUT + 1V) or (VIN + 1V)
OUT Short Circuit to GND ..........................................Continuous
Continuous Power Dissipation (TA = +70°C)
14-Pin TDFN 3mm x 3mm
(derate 18.2mW/°C above +70°C) .............................1454mW
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
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
(VIN = 3.6V, VGND = 0V, EN_ (PWM) = IN, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
IN Operating Voltage
Undervoltage-Lockout Threshold
Undervoltage-Lockout Hysteresis
VIN rising or falling
CONDITIONS
MIN TYP MAX UNITS
2.7 5.5 V
2.20 2.45 2.65
V
100 mV
Output Overvoltage Protection
Threshold
VOUT rising, any LED_ = GND
5V
No-Load Supply Current
1/32nd setting, 1.5x mode
1/32nd setting, 1x mode
1.4
0.35
Shutdown Supply Current
ENM = ENS (PWM) = GND
TA = +25°C
TA = +85°C
0.01 2
0.1
Soft-Start Time (tSOFT-START)
MAX8630_ETD15
2
15
Full-Scale LED Current
MAX8630_ETD18
MAX8630_ETD20
18
20
MAX8630_ETD25
25
Full-Scale LED Current Accuracy TA = +25°C
TA = -40°C to derating function start temperature
-1 ±0.3 +1
-3.5 ±0.3 +3.5
Derating Function Start
Temperature
40
mA
µA
ms
mA
%
°C
Derating Function Slope
LED_ Dropout Voltage
TA = +40°C to +85°C
100% LED setting (Note 2)
-1.67
%/°C
40 75 mV
1x to 1.5x Mode Transition
Threshold
VLED_ falling
88 mV
Input Voltage Mode Transition
Hysteresis
70 mV
1.5x Mode Regulation Voltage
OUT Pulldown Resistance in
Shutdown
Minimum of VLED_
ENM = ENS (PWM) = GND
122 mV
5 kΩ
2 _______________________________________________________________________________________

No Preview Available !

www.DataSheet4U.com
125mA 1x/1.5x Charge Pumps for 5 White LEDs
in 3mm x 3mm TDFN
ELECTRICAL CHARACTERISTICS (continued)
(VIN = 3.6V, VGND = 0V, EN_ (PWM) = IN, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
Open-Loop OUT Resistance
Maximum OUT Current
OUT Short-Circuit Current Limit
Switching Frequency
Direct-PWM Dimming Filter
Corner Frequency (MAX8630Y)
EN_ (PWM) High Voltage
EN_ (PWM) Low Voltage
EN_ (PWM) Minimum Input
Slew Rate
EN_ (PWM) Input Current
EN_ (PWM) Low Shutdown Delay
(tSHDN)
EN_ tLO (See Figure 4)
EN_ tHI (See Figure 4)
Initial EN_ tHI (See Figure 4)
Thermal Shutdown
Thermal-Shutdown Hysteresis
CONDITIONS
1x mode, (VIN - VOUT) / IOUT
1.5x mode, (1.5VIN - VOUT) / IOUT
VIN 3.2V, VOUT = 3.9V
VOUT < 1.25V
CCPWM = 0.1µF, (PWM frequency of 900Hz to 200kHz
recommended)
VIN = 2.7V to 5.5V
VIN = 2.7V to 5.5V
VIN = 2.7V to 5.5V (recommended minimum slew rate)
VEN_ (PWM) = 0V or 5.5V
TA = +25°C
TA = +85°C
First EN_ (PWM) high pulse
MIN TYP MAX UNITS
0.8 1.5
3.2 7.2
Ω
125 mA
57 mA
1 MHz
10 Hz
1.4 V
0.4 V
1 V/µs
0.01 1
0.1
µA
4 ms
0.5 500.0
0.5
50
+160
20
µs
µs
µs
°C
°C
Note 1: Limits are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed by design.
Note 2: Dropout voltage is defined as the LED_ to GND voltage at which current into LED_ drops 10% from the value at VLED_ = 0.2V.
Typical Operating Characteristics
(VIN = 3.6V, ENM = ENS = IN, TA = +25°C, unless otherwise noted.)
EFFICIENCY vs. INPUT VOLTAGE
DRIVING 5 LEDs
100
90
80
70
60
50 ILED = 1.875mA
ILED = 20mA
40
30 ILED = 8.125mA
20
10
0
2.7
VIN FALLING
3.0 3.3 3.6 3.9
INPUT VOLTAGE (V)
4.2
INPUT CURRENT vs. INPUT VOLTAGE
DRIVING 5 LEDs
160
VIN FALLING
140
120 ILED = 20mA
100
ILED = 8.125mA
80
60
40 ILED = 1.875mA
20
0
2.7 3.0 3.3 3.6 3.9 4.2
INPUT VOLTAGE (V)
INPUT CURRENT vs. INPUT VOLTAGE
DRIVING 3 MAIN LEDs
160
VIN FALLING
140
120 ILED = 20mA
100
80
ILED = 8.125mA
60
40
ILED = 1.875mA
20
0
2.7 3.0 3.3 3.6 3.9 4.2
INPUT VOLTAGE (V)
_______________________________________________________________________________________ 3

No Preview Available !

www.DataSheet4U.com
125mA 1x/1.5x Charge Pumps for 5 White LEDs
in 3mm x 3mm TDFN
Typical Operating Characteristics (continued)
(VIN = 3.6V, ENM = ENS = IN, TA = +25°C, unless otherwise noted.)
INPUT CURRENT vs. INPUT VOLTAGE
DRIVING 2 SUB LEDs
160
VIN FALLING
140
120
100
ILED = 20mA
80
60
ILED = 8.125mA
40
20 ILED = 1.875mA
0
2.7 3.0 3.3 3.6 3.9
INPUT VOLTAGE (V)
4.2
INPUT RIPPLE VOLTAGE vs. SUPPLY
VOLTAGE DRIVING 5 WHITE LEDs
140
20mA/LED
120
100 15mA/LED
80
8mA/LED
60
40 2mA/LED
20
0
2.7 3.2 3.7 4.2
INPUT VOLTAGE (V)
LED CURRENT MATCHING vs. INPUT
VOLTAGE (25mA/LED)
28
27
26
25
24
23
22
21
20
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
INPUT VOLTAGE (V)
LED CURRENT MATCHING vs. INPUT
VOLTAGE (2.5mA/LED)
2.80
2.70
2.60
2.50
2.40
2.30
2.20
2.10
2.00
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
INPUT VOLTAGE (V)
OUTPUT CURRENT vs. TEMPERATURE
(5 LEDs AT 25mA EACH)
140
120
100
80
TEMPERATURE
60 DERATING
40
20
0
-40
-15 10 35 60
TEMPERATURE (°C)
85
1x MODE OPERATING WAVEFORMS
(VIN = 4.0V)
MAX8630Y/Z toc09
1.5x MODE OPERATING WAVEFORMS
(VIN = 3.6V)
MAX8630Y/Z toc10
VOUT
200mV/div
(AC-COUPLED)
VOUT
200mV/div
(AC-COUPLED)
VIN
200mV/div
(AC-COUPLED)
VIN
200mV/div
(AC-COUPLED)
IIN
100mA/div
IIN
100mA/div
1μs/div
1μs/div
4 _______________________________________________________________________________________

No Preview Available !

www.DataSheet4U.com
125mA 1x/1.5x Charge Pumps for 5 White LEDs
in 3mm x 3mm TDFN
Typical Operating Characteristics (continued)
(VIN = 3.6V, ENM = ENS = IN, TA = +25°C, unless otherwise noted.)
VENM AND
VENS
VOUT
IIN
IOUT
STARTUP AND SHUTDOWN
MAX8630Y/Z toc11
5V/div
2V/div
1ms/div
0
100mA/div
0
100mA/div
0
VENM AND
VENS
VOUT
STARTUP AND DIMMING
MAX8630Y/Z toc13
5V/div
1V/div
VENM
VOUT
IIN
MAIN STARTUP AND SHUTDOWN
WITH SUB ENABLED
MAX8630Y/Z toc12
5V/div
2V/div
0
100mA/div
0
IOUT 100mA/div
0
1ms/div
LINE-TRANSIENT RESPONSE WITH MODE CHANGE
(VIN = 3.8V TO 3.2V TO 3.8V)
MAX8630Y/Z toc14
VIN 1V/div
VOUT 500mV/div
3V
50mA/div
IOUT
20mA/div
IOUT
0
20ms/div
200μs/div
Pin Description
PIN
MAX8630Z
MAX8630Y
11
22
33
44
NAME
FUNCTION
GND
C1N
IN
C2N
Ground. Connect GND to system ground and the input bypass capacitor as
close to the IC as possible. Connect GND to the exposed pad directly under
the IC.
Transfer Capacitor 1 Negative Connection. Connect a 1µF ceramic capacitor
from C1P to C1N.
Supply Voltage Input. Connect a 1µF ceramic capacitor from IN to GND. The
input voltage range is 2.7V to 5.5V.
Transfer Capacitor 2 Negative Connection. Connect a 1µF ceramic capacitor
from C2P to C2N.
_______________________________________________________________________________________ 5