MAX1553：High-Efficiency, 40V Step-Up Converters for 2 to 10 White LEDs

Smallest, Highest Efficiency, 40V Driver for Up to 10 White LEDs

The MAX1553/MAX1554 drive white LEDs in series with a constant current to provide efficient display backlighting in cellular phones, PDAs, and other hand-held devices. The step-up converter includes an internal 40V, low RDSON, N-channel MOSFET switch for high efficiency and maximum battery life. The MAX1553 has a current limit of 480mA for driving two to six white LEDs, while the MAX1554 has a current limit of 970mA for driving up to 10 white LEDs. A single analog/PWM Dual Mode™ input provides two simple means of brightness adjustment. A separate enable input provides on/off control. Soft-start minimizes inrush current during startup. The MAX1553/MAX1554 are available in space-saving 8-pin TDFN 3mm x 3mm packages.

Key Features

Highly Integrated and Flexible Solution for Wide Range of Backlighting Applications
- Constant-Current Regulation for Even LED Illumination
- Internal 40V MOSFET Switch Capable of Driving 10 LEDs
- 2.7V to 5.5V Input Voltage Range
- Analog or PWM Control of LED Intensity
- Optimized for Low Input Ripple
Soft-Start Minimizes Inrush Current
High Efficiency Improves Battery Life
- Up to 88% Efficiency Driving 6 LEDs
- Up to 82% Efficiency Driving 9 LEDs (20mA, VCC = 3.6V)
Tiny 8-Pin, 3mm x 3mm TDFN Package Saves Space
- Small, Low-Profile External Components

Integrated 1-cell Li+ chargers and Smart Power Selectors™ with dual (AC adapter and USB) power inputs | Typical Operating Circuit

Applications/Uses

Cell Phones
Color Display Backlight
PDA, Palmtop, and Wireless Handhelds

DataSheet

title	Download file
MAX1553-MAX1554 Data Sheet	MAX1553-MAX1554.pdf

Parametrics

Part Number	Battery Input	Regulation Topology	Max. No. of LEDs	LED Channels	LED Configuration	I_LED per Channel (A)	PWM Dimming Freq. (kHz)	Dimming Ratio	Dimming Control	V_{CURR_SENSE} (mV)	P_OUT (W)	V_IN (V)	V_IN (V)	I_CC (mA)	LED String Volt. (V)	Oper. Freq. (kHz)	Package/Pins	Budgetary Price
Part Number	Battery Input	Regulation Topology	Max. No. of LEDs	LED Channels	LED Configuration	max	max	max	Dimming Control	V_{CURR_SENSE} (mV)	P_OUT (W)	min	max	max	max	Oper. Freq. (kHz)	Package/Pins	See Notes
MAX1553	1-Cell Li+	Inductor Based	6	1	Series	0.02	10	10	Analog PWM	200	0.5	2.7	5.5	0.35	40	250	TDFN-EP/8	$1.25 @1k
MAX1554	1-Cell Li+	Inductor Based	10	1	Series	0.02	10	10	Analog PWM	200	0.8	2.7	5.5	0.65	40	250	TDFN-EP/8	$1.35 @1k

Design kits & evaluation modules

MAX1553EVKIT

Quality and Environmental Data

MAX1553.pdf

Ordering Information

Part Number	Status	Recommended Replacement	Package	Temp	RoHS
MAX1553ETA+	Active		TDFN-EP,;8 pin;9.6 mm²	-40°C to +85°C	Lead Free
MAX1553ETA+T	Active		TDFN-EP,;8 pin;9.6 mm²	-40°C to +85°C	Lead Free
MAX1553ETA-T	No Longer Available	MAX1553ETA+T	TDFN-EP,;8 pin;9.6 mm²	-40°C to +85°C	No