MAXIM INTEGRATED PRODUCTS MAX8645X MAX8645Y Data Sheet
Summary
This advanced charge pump is designed to power sophisticated white LED backlights and flash units in portable electronics like smartphones and digital cameras. It features high efficiency, dual low-noise LDOs, and adaptive charging modes for flexible brightness control. The manual provides detailed technical specifications, wiring diagrams, component requirements, and operating parameters necessary for system engineers developing reliable, energy-efficient illumination solutions.
Page 1 Text Content
19-3978; Rev 3; 12/06
EVALUATION KIT AVAILABLE
1x/1.5x/2x White LED Charge Pumps with
Two LDOs in 4mm x 4mm TQFN General Description Features
The MAX8645X/MAX8645Y charge pumps drive up to
Power Up to Eight LEDs
eight white LEDs with regulated constant current for uni-
Up to 30m A/LED Drive for Backlight
form intensity. The main group of LEDs (M1–M6) can be driven up to 30m A per LED for backlighting. The flash Up to 400m A Total Drive for Flash group of LEDs (F1 and F2) is independently controlled
Two Internal Low-Noise 200m A LDOs
and can be driven up to 200m A per LED (or 400m A total). Two 200m A LDOs are on-board to provide power for
94% Max/85% Avg Efficiency (PLED/PBATT) over Li+
camera functions. The LDOs’ output voltages are pin pro-
Battery Discharge
grammable to meet different camera-module require- ments. The MAX8645X and MAX8645Y differ only in LDO
0.2% Typical LED Current Matching
output voltages. By utilizing adaptive 1x/1.5x/2x charge- pump modes and very-low-dropout current regulators, Adaptive 1x/1.5x/2x Mode Switchover the MAX8645X/MAX8645Y achieve high efficiency over
Flexible Brightness Control
the full 1-cell lithium-battery voltage range. The 1MHz fixed-frequency switching allows for tiny external compo- Single-Wire, Serial-Pulse Interface (32 Steps) nents, and the regulation scheme is optimized to ensure
2-Bit Logic (Three Levels)
low EMI and low input ripple.
Thermal TA Derating Function
The MAX8645X/MAX8645Y are available in a 28-pin TQFN, 4mm x 4mm (0.8mm max height) lead-free package.
Low Input Ripple and EMI
2.7V to 5.5V Supply Voltage Range
Applications
Soft-Start, Overvoltage, and Thermal-Shutdown
Camera Phones and Smartphones
Protection
Backlighting and Flash
28-Pin TQFN, 4mm x 4mm Package
PDAs, Digital Cameras, and Camcorders
Typical Operating Circuit Ordering Information
PIN- PKG
PART TEMP RANGE
PACKAGE CODE
INPUT OUTPUT
2.7V TO 5.5V UP TO 580m A
PIN OUT 28 TQFN-EP
MAX8645XETI+ -40°C to +85°C T2844-1
10μF MAIN FLASH
IN 4mm x 4mm
MAX8645X 28 TQFN-EP GND MAX8645Y M1 MAX8645YETI+ -40°C to +85°C T2844-1
PGND 4mm x 4mm
M3 EP = Exposed paddle.
M4 +Denotes a lead-free package.
MAIN ON/OFF M5 AND DIMMING
ENM2 M6 F1
F2FLASH ON/OFF DUAL-LDO ON/OFF ENLDO LDO1 CAMERA
LDO2 MODULEDUAL-LDO
VOLTAGE 1μF1μF
SELECTION P2
SETF REFSETM Pin Configuration appears at end of data sheet.
Maxim Integrated Products
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.
Page Summary Contents For MAXIM INTEGRATED PRODUCTS MAX8645X MAX8645Y Data Sheet
Manual Details
| Brand | Maxim Integrated |
|---|---|
| Pages | 15 |
| File Size | 310.70 KB |
| Published | May 26, 2026 |
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Frequently Asked Questions
What are the maximum current limits for the LED groups?
The main group (M1–M6) handles up to 30mA/LED (totaling 150mA), while the flash group (F1 and F2) can be driven up to 400mA total.
Does this chip support different voltage requirements?
Yes, it includes two internal low-noise LDOs providing power for battery discharge, with output voltages configurable to meet various camera module needs.
What is the operational temperature range?
The typical operating temperature range is from -40°C to +85°C. The absolute maximum junction temperature is +150°C.
How does the chip ensure high efficiency across different battery levels?
It uses adaptive 1x/1.5x/2x charge-pump mode switchover and low-dropout current regulators, optimizing performance over the full 1-cell lithium-battery voltage range.