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MAX1574 데이터시트 PDF




Maxim Integrated에서 제조한 전자 부품 MAX1574은 전자 산업 및 응용 분야에서
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부품번호 MAX1574 기능
기능 180mA / 1x/2x / White LED Charge Pump in 3mm x 3mm TDFN
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MAX1574 데이터시트, 핀배열, 회로
19-3117; Rev 0; 12/03
EVAALVUAAILTAIOBNLEKIT
180mA, 1x/2x, White LED Charge Pump
in 3mm x 3mm TDFN
General Description
The MAX1574 charge pump drives up to three white
LEDs with regulated constant current for uniform intensity.
By utilizing adaptive 1x/2x charge-pump modes and
very-low-dropout current regulators, it achieves 180mA
output drive capability and high efficiency over the 1-cell
lithium-battery input voltage range. Fixed-frequency
(1MHz) switching allows for tiny external components,
and the regulation scheme is optimized to ensure low EMI
and low input ripple.
The MAX1574 uses an external resistor to set the full-
scale 100% LED current. An enable input (EN) is used for
simple on/off control or can be pulsed repeatedly to set
lower LED current in multiple steps down to 5%. Once the
desired brightness is set, the MAX1574 maintains con-
stant LED current as long as EN is kept high. If EN is kept
low for more than 2ms, the MAX1574 enters shutdown.
The MAX1574 is available in a 10-pin 3mm x 3mm TDFN
package (0.8mm max height).
Applications
LCD Backlighting
Camera Strobes/Flashes and Movie Lights
Cell Phones/Smart Phones
PDAs, Digital Cameras, and Camcorders
Typical Operating Circuit
0.22µF
2.7V TO 5.5V
CP
IN
CN UP TO 180mA
OUT
1µF
MAX1574
GND
1µF
LED1
ON/OFF AND
DIMMING
EN
LED2
SET LED3
Features
Up to 180mA (60mA/LED) Drive Capability
83% Average Efficiency (PLED / PBATT) Over Li+
Battery Discharge
0.5% (typ) LED Current Matching
Adaptive 1x/2x Mode Switchover
Low Input Ripple and EMI
5% to 100% Dimming Through Single-Wire Serial
Pulse Interface
Low 0.1µA Shutdown Current
2.7V to 5.5V Supply Voltage Range
Soft-Start Limits Inrush Current
Output Overvoltage Protection
Thermal-Shutdown Protection
10-Pin 3mm x 3mm TDFN Package
Ordering Information
PART
MAX1574ETB
TEMP RANGE
-40°C to +85°C
PIN-
PACKAGE
10 TDFN
3mm x 3mm
TOP
MARK
ABB
Pin Configuration
TOP VIEW
10 9 8 7 6
MAX1574
123 4 5
TDFN
3mm × 3mm
________________________________________________________________ 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.




MAX1574 pdf, 반도체, 판매, 대치품
180mA, 1x/2x, White LED Charge Pump
in 3mm x 3mm TDFN
Typical Operating Characteristics (continued)
(Circuit of Figure 2, VIN = 3.6V, EN = IN, driving three white LEDs, TA = +25°C, unless otherwise noted.)
1.0
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
2.7
LED CURRENT MATCHING
vs. INPUT SUPPLY VOLTAGE
ILED = 8mA
3.1 3.5 3.9 4.3 4.7 5.1 5.5
INPUT SUPPLY VOLTAGE (V)
LED CURRENT vs. TEMPERATURE
8.20
8.15
8.10
8.05
8.00
7.95
7.90
7.85
7.80
-40
-15 10 35 60
TEMPERATURE (°C)
85
LED CURRENT vs. RSET
100
10
100% BRIGHTNESS
SETTING
1
1 10
100
RSET (k)
1000
OPERATING WAVEFORMS (1x)
MAX1574 toc07
OPERATING WAVEFORMS (2x)
MAX1574 toc08
VOUT
50mV/div
AC-COUPLED
20mV/div
VIN AC-COUPLED
IIN 50mA/div
400ns/div
0mA
VOUT
50mV/div
AC-COUPLED
20mV/div
VIN AC-COUPLED
IIN 50mA/div
400ns/div
0mA
STARTUP AND SHUTDOWN
MAX1574 toc09
VEN 5V/div
IIN 100mA/div
0mA
VOUT 2V/div
0V
1ms/div
4 _______________________________________________________________________________________

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MAX1574 전자부품, 판매, 대치품
180mA, 1x/2x, White LED Charge Pump
in 3mm x 3mm TDFN
Table 1. Recommended Components
COMPONENT
DESIGNATION
CIN, COUT
C1
D1, D2, D3
RSET
VALUE
1µF
0.22µF
0.47µF
As Required
MANUFACTURER PART NUMBER
DESCRIPTION
Taiyo Yuden
TDK
Taiyo Yuden
TDK
Taiyo Yuden
TDK
Nichia
Citizen
Kamaya
Panasonic
JMK107BJ105KA 1µF ±10%, 6.3V X5R ceramic capacitors (0603)
C1005X5R0J105M 1µF ±20%, 6.3V X5R ceramic capacitors (0402)
JMK105BJ224KV 0.22µF ±10%, 6.3V X5R ceramic capacitor (0402)
C1005X5R0J224K 0.22µF ±10%, 6.3V X5R ceramic capacitor (0402)
JMK105BJ474KV 0.47µF ±10%, 6.3V X5R ceramic capacitor (0402)
C1005X5R0J474K 0.47µF ±10%, 6.3V X5R ceramic capacitor (0402)
NSCW215T
White LEDs
CL-470S
White LED flash module
— 1% resistor
Applications Information
Driving Fewer than Three LEDs
When driving fewer than three LEDs, connect any unused
LED_ directly to IN (Figure 3). When connected in this
manner, the corresponding LED driver is disabled.
Driving Camera Strobes/Flashes
The MAX1574’s 180mA output capability makes it suit-
able for driving white LED camera strobes/flashes. For
example, the typical operating circuit drives a 3-LED
flash module with up to 60mA/LED. To ensure 180mA
total drive capability at low input voltages, increase C1
to 0.47µF.
To drive fewer or more LEDs with regulated total cur-
rent up to 180mA or to reduce the number of connect-
ing wires, short LED1, LED2, and LED3 together. When
connected this way, some LED modules have good
LED-to-LED forward-voltage matching, while others
may require individual ballast resistors. It is a good
idea to keep the ballast resistance as low as practical
for reasonable matching because high-ballast resis-
tance reduces the output drive capability due to the
higher VOUT requirement.
Input Ripple
For LED drivers, input ripple is more important than out-
put ripple. Input ripple depends on the source supply’s
impedance. Adding a lowpass filter to the input further
reduces input ripple. Alternatively, increasing CIN to
2.2µF cuts input ripple in half with only a small increase in
footprint. The 1x mode always has very low input ripple.
Component Selection
Use only ceramic capacitors with an X5R, X7R, or better
dielectric. See Table 1 for a list of recommended parts.
PC Board Layout and Routing
The MAX1574 is a high-frequency switched-capacitor
voltage regulator. For best circuit performance, use a
solid ground plane and place CIN, COUT, and C1 as
close to the MAX1574 as possible. Refer to the
MAX1574 evaluation kit for an example.
_______________________________________________________________________________________ 7

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