MAX1573ETE+ Maxim Integrated Products, MAX1573ETE+ Datasheet - Page 7

• Manufacturer Part Number: MAX1573ETE+
• Description: IC LED DRVR WHITE BCKLGT 16-TQFN
• Manufacturer: Maxim Integrated Products
• Type: Backlight, White LEDr

Specifications of MAX1573ETE+

• Constant Current: Yes
• Topology: Linear (LDO), PWM, Step-Down (Buck), Step-Up (Boost), Switched Capacitor (Charge Pump)
• Number Of Outputs: 4
• Internal Driver: Yes
• Type - Primary: Backlight
• Type - Secondary: White LED
• Frequency: 1MHz
• Voltage - Supply: 2.7 V ~ 5.5 V
• Voltage - Output: 5V
• Mounting Type: Surface Mount
• Package / Case: 16-TQFN Exposed Pad
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 28mA
• Internal Switch(s): Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Efficiency: -
• Lead Free Status / Rohs Status: Details

Table 2. Typical Component Values
The MAX1573 is a high-frequency switched-capacitor
voltage regulator. For best circuit performance, use a
solid ground plane and place C
to the MAX1573 as possible. Also, place their ground
pads close together and as close as possible to GND.
See the MAX1573 EV kit for an example.
Use ceramic capacitors with an X5R dielectric or better
temperature coefficient. The transfer capacitors may be
reduced in value if the input voltage does not fall below
Figure 3. C-R-C Filter Reduces Input Ripple
TRANSISTOR COUNT: 3655
PROCESS: BiCMOS
Input/Output
Capacitors
Transfer
Capacitors
LED
R
COMPONENT
SET
V
IN
2.2μF
1Ω
R SET
2.2μF
EN1
EN2
SET
IN
VALUE (µF)
As required
PC Board Layout and Routing
_______________________________________________________________________________________
C1P C1N
0.47
0.22
—
1
1
1μF
MAX1573
GND
Component Selection
C2P C2N
Chip Information
1μF
MANUFACTURER
White LED 1x/1.5x Charge Pump in
IN
Taiyo Yuden
Taiyo Yuden
Taiyo Yuden
Taiyo Yuden
Panasonic
and C
OUT
LED1
LED2
LED3
LED4
Nichia
1μF
OUT
as close
JMK107BJ105KA
JMK107BJ105KA
LMK107BJ474KA
LMK107BJ224KA
NSCW215T
PART
—
3.4V, if only two or three LEDs are used, or if four LEDs
are used at 10mA or less. Some typical external com-
ponent values are shown in Table 2.
Under normal operating conditions, power dissipation
is low. Maximum power dissipation occurs at an input
voltage of 4.2V and all four LEDs (with V
ven with 30mA per LED. The power is calculated as:
At higher input voltages, the MAX1573 switches to 1x
mode and power dissipation decreases.
TOP VIEW
Pin Configurations (continued)
P
UCSP and Thin QFN
D
C
D
A
B
= [(1.5 x V
1µF ±10%, 6.3V X5R ceramic capacitor (0603)
1µF ±10%, 6.3V X5R ceramic capacitor (0603)
0.47µF ±10%, 10V X5R ceramic capacitor (0603)
0.22µF ±10%, 10V X7R ceramic capacitor (0603)
White LEDs
±1% resistor (0603)
C1P
C2N
C1N
IN
1
IN
) - V
UCSP 4
OUT
GND
C2P
2
DESCRIPTION
F
] x 120mA = 276mW
✕
LED4
LED3
EN1
3
4
LED2
LED1
EN2
SET
4
F
= 4V) are dri-
7