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MAX1910EUB+T

P1-P3P4-P6P7-P9P10-P11
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim's website at www.maxim-ic.com.
General Description
The MAX1910/MAX1912 power LEDs with a regulated
output voltage or current (up to 120mA) from an unreg-
ulated input supply (2.7V to 5.3V). These are complete
DC-DC converters requiring only four small ceramic
capacitors and no inductors. Input ripple is minimized
by a unique regulation scheme that maintains a fixed
750kHz switching frequency over a wide load range.
Also included are logic-level shutdown and soft-start to
reduce input current surges at startup.
The MAX1910 has two automatically selected operating
modes: 1.5x and 2x. 1.5x mode improves efficiency at
higher input voltages, while 2x mode maintains regula-
tion at lower input voltages. The MAX1912 operates
only in 1.5x mode.
The MAX1910 and the MAX1912 are available in a
space-saving 10-pin µMAX package.
Applications
White LED Backlighting
Cellular Phones
PDAs
Digital Still Cameras
MP3 Players
Backup-Battery Boost Converters
Features
♦ High-Efficiency 1.5x/2x Charge Pumps
♦ Low Input Ripple with 750kHz Operation
♦ 200mV Current-Sense Threshold Reduces
Power Loss
♦ Current- or Voltage-Regulated Charge Pump
♦ Up to 120mA Output Current
♦ No Inductors Required
♦ Small Ceramic Capacitors
♦ Regulated ±5% LED Current
♦ Load Disconnected in Shutdown
♦ 1µA Shutdown Current
♦ Small 10-Pin µMAX Package
MAX1910/MAX1912
1.5x/2x High-Efficiency White LED
Charge Pumps
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
1
2
3
4
5
10
9
8
7
6
SET
C1-
IN2
C2+C1+
C2-
IN1
GND
MAX1910
MAX1912
μ
MAX
TOP VIEW
OUT SHDN
Pin Configuration
19-2290; Rev 2; 3/04
PART TEMP RANGE PIN-PACKAGE
MAX1910EUB -40°C to +85°C 10 µMAX
MAX1912EUB -40°C to +85°C 10 µMAX
V
IN
C
IN
C1
C2
C
OUT
IN1
IN2
C1+
C1-
C2+
C2-
GND
SET
OUT
SHDN
MAX1910
MAX1912
Typical Operating Circuit
EVALUATION KIT
AVAILABLE
MAX1910/MAX1912
1.5x/2x High-Efficiency White LED
Charge Pumps
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= 3.6V, GND = 0, SHDN = SET = IN, C
IN
= 2.2µF, C1 = C2 = 0.47µF, C
OUT
= 2.2µF, T
A
= 0°C to +85°C. Typical values are at
T
A
= +25°C, unless otherwise noted.)
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.
IN1, IN2, OUT, SHDN, SET to GND …………………-0.3V to +6V
C1-, C2-, to GND..................................................-0.3V, V
IN
+ 1V
C1+, C2+ to GND..........-0.3V, greater of V
OUT
+ 1V or V
IN
+ 1V
OUT Short-Circuit to GND ..........................................Continuous
Continuous Power Dissipation (T
A
= +70°C)
10-Pin µMAX (derate 5.6 mW/°C above +70°C) ..........444mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) ................................ +300°C
PARAMETER CONDITIONS
MIN TYP MAX UNITS
Input Voltage Operating Range 2.7 5.3 V
Undervoltage Lockout Threshold Both rising and falling edges 2.2 2.5 V
Undervoltage Lockout Hysteresis 35 mV
SET Regulation Point
0.19
0.2
0.21
V
MAX1910 Current Regulation Output current change for 2.7V < V
OUT
< 5V 0.5
%/V
MAX1912 Current Regulation Output current change for 3V < V
OUT
< 5V 0.5
%/V
MAX1910 V
IN
= 2.7V 80
Maximum Output Current
MAX1912 V
IN
= 3.6V
120
mA
No Load Input Current V
IN
=
3.6V 1.5 2.5 mA
Supply Current in Shutdown V
IN
= 5.3V, V
OUT
= 0, SHDN = 0 0.1 10 µA
Output Leakage Current in Shutdown
V
IN
= 3.6V, SHDN = 0 0.1 10 µA
Switching Frequency
V
IN
= 3.6V
625 750 875
kHz
Switching Frequency Temperature
Coefficient
f = 750kHz
250 ppm/°C
SET Input Current 1
100
nA
SHDN Input Current SHDN = 0 or 5.5V 1 µA
SHDN Input Voltage Low 2.7V < V
IN
< 5.3V 0.4 V
SHDN Input Voltage High 2.7V < V
IN
< 5.3V 1.6 V
Thermal-Shutdown Threshold Rising temperature, 15°C hysteresis typical
160
°C
ELECTRICAL CHARACTERISTICS
(V
IN
= 3.6V, GND = 0, SHDN = SET = IN, C
IN
= 2.2µF, C1 = C2 = 0.47µF, C
OUT
= 2.2µF, T
A
= -40°C to +85°C, unless otherwise
noted.) (Note 1)
PARAMETER CONDITIONS MIN MAX
UNITS
Input Voltage Operating Range 2.7 5.3 V
Undervoltage Lockout Threshold Both rising and falling edges 2.2 2.5 V
MAX1910 V
IN
= 2.7V 80
Maximum Output Current
MAX1910 V
IN
= 3.6V 120
mA
Supply Current in Shutdown V
IN
= 5.3V, V
OUT
= 0, SHDN = 0 10 µA
MAX1910/MAX1912
1.5x/2x High-Efficiency White LED
Charge Pumps
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 3.6V, GND = 0, SHDN = SET = IN, C
IN
= 2.2µF, C1 = C2 = 0.47µF, C
OUT
= 2.2µF, T
A
= -40°C to +85°C, unless otherwise
noted.) (Note 1)
PARAMETER CONDITIONS MIN MAX
UNITS
Output Leakage Current in Shutdown V
IN
= 3.6V, SHDN = 0 10 µA
SET Regulation Point 0.19 0.21 V
SET Input Current 100 nA
SHDN Input Current SHDN = 0 or 5.5V 1 µA
SHDN Input Voltage Low 2.7V < V
IN
< 5.3V 0.4 V
SHDN Input Voltage High 2.7V < V
IN
< 5.3V 1.6 V
Note 1: Limits to -40°C are guaranteed by design, not production tested.
Typical Operating Characteristics
(Circuit of Figure 2, V
IN
= 3.3V, T
A
= +25°C, unless otherwise noted.)
INPUT AND OUTPUT VOLTAGE RIPPLE
MAX1910/12 toc01
1μs/div
V
IN
V
OUT
20mV/div
I
OUT
= 60mA
START-UP INPUT CURRENT AND
OUTPUT VOLTAGE
MAX1910/12 toc03
I
IN
1ms/div
V
OUT
2V/div
50mA/div
5V/div
V
SHDN
QUIESCENT CURRENT vs. INPUT VOLTAGE
MAX1910/12 toc04
INPUT VOLTAGE (V)
QUIESCENT CURRENT (mA)
4.03.50.5 1.0 1.5 2.52.0 3.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0
04.5
LED CURRENT vs. INPUT VOLTAGE
MAX1910/12 toc05
INPUT VOLTAGE (V)
LED CURRENT (mA)
4.23.93.63.33.0
20
40
60
80
100
120
140
0
2.7 4.5
INTENSITY CHANGE STEP RESPONSE
MAX1910/12 toc06
40μs/div
V
LOGIC
I
OUT
V
SET
2V/div
100mV/div
60mA
20mA
CIRCUIT OF FIGURE 9
P1-P3P4-P6P7-P9P10-P11

MAX1910EUB+T

Mfr. #:
Buy MAX1910EUB+T
Manufacturer:
Maxim Integrated
Description:
LED Lighting Drivers 1.5x/2x White LED
Lifecycle:
New from this manufacturer.
Delivery:
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