MAX8645YETI+T Maxim Integrated Products, MAX8645YETI+T Datasheet

IC LED DRVR WHITE BCKLGT 28-TQFN

MAX8645YETI+T

Manufacturer Part Number
MAX8645YETI+T
Description
IC LED DRVR WHITE BCKLGT 28-TQFN
Manufacturer
Maxim Integrated Products
Type
Backlight, White LEDr
Datasheet

Specifications of MAX8645YETI+T

Constant Current
Yes
Topology
Linear (LDO), Switched Capacitor (Charge Pump)
Number Of Outputs
8
Internal Driver
Yes
Type - Primary
Backlight
Type - Secondary
White LED
Frequency
1MHz
Voltage - Supply
2.7 V ~ 5.5 V
Voltage - Output
5.5V
Mounting Type
Surface Mount
Package / Case
28-TQFN Exposed Pad
Operating Temperature
-40°C ~ 85°C
Current - Output / Channel
200mA
Internal Switch(s)
Yes
Efficiency
85%
Number Of Segments
8
Low Level Output Current
400 mA
Operating Supply Voltage
2.7 V to 5.5 V
Maximum Supply Current
5.5 mA
Maximum Power Dissipation
1666 mW
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX8645X/MAX8645Y charge pumps drive up to
eight white LEDs with regulated constant current for uni-
form intensity. The main group of LEDs (M1–M6) can be
driven up to 30mA per LED for backlighting. The flash
group of LEDs (F1 and F2) is independently controlled
and can be driven up to 200mA per LED (or 400mA total).
Two 200mA LDOs are on-board to provide power for
camera functions. The LDOs’ output voltages are pin pro-
grammable to meet different camera-module require-
ments. The MAX8645X and MAX8645Y differ only in LDO
output voltages. By utilizing adaptive 1x/1.5x/2x charge-
pump modes and very-low-dropout current regulators,
the MAX8645X/MAX8645Y achieve high efficiency over
the full 1-cell lithium-battery voltage range. The 1MHz
fixed-frequency switching allows for tiny external compo-
nents, and the regulation scheme is optimized to ensure
low EMI and low input ripple.
The MAX8645X/MAX8645Y are available in a 28-pin TQFN,
4mm x 4mm (0.8mm max height) lead-free package.
19-3978; Rev 4; 6/08
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.
DUAL-LDO ON/OFF
AND DIMMING
MAIN ON/OFF
FLASH ON/OFF
SELECTION
DUAL-LDO
INPUT
2.7V TO 5.5V
VOLTAGE
Camera Phones and Smartphones
Backlighting and Flash
PDAs, Digital Cameras, and Camcorders
10μF
PIN
IN
GND
PGND
ENM1
ENM2
ENF
ENLDO
P1
P2
C1P
Typical Operating Circuit
SETM
1μF
________________________________________________________________ Maxim Integrated Products
1x/1.5x/2x White LED Charge Pumps with
C1N
MAX8645X
MAX8645Y
SETF
C2P
General Description
1μF
REF
C2N
LDO1
LDO2
OUT
0.01μF
M1
M2
M3
M4
M5
M6
F1
F2
UP TO 580mA
OUTPUT
10μF
1μF
Applications
1μF
Two LDOs in 4mm x 4mm TQFN
MAIN
CAMERA
MODULE
FLASH
♦ Power Up to Eight LEDs
♦ Two Internal Low-Noise 200mA LDOs
♦ 94% Max/85% Avg Efficiency (P
♦ 0.2% Typical LED Current Matching
♦ Adaptive 1x/1.5x/2x Mode Switchover
♦ Single-Wire, Serial-Pulse Interface for Brightness
♦ Thermal T
♦ Low Input Ripple and EMI
♦ 2.7V to 5.5V Supply Voltage Range
♦ Soft-Start, Overvoltage, and Thermal-Shutdown
♦ 28-Pin TQFN, 4mm x 4mm Package
EP = Exposed pad.
+ Denotes a lead-free package.
Pin Configuration appears at end of data sheet.
MAX8645XETI+
MAX8645YETI+
Battery Discharge
Control (32 Steps)
Protection
Up to 30mA/LED Drive for Backlight
Up to 400mA Total Drive for Flash
PART
A
Derating Function
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
Ordering Information
LED
PIN-PACKAGE
28 TQFN-EP
4mm x 4mm
28 TQFN-EP
4mm x 4mm
/P
BATT
Features
) over Li+
1

Related parts for MAX8645YETI+T

MAX8645YETI+T Summary of contents

Page 1

... SELECTION P2 SETM SETF REF 0.01μF ________________________________________________________________ Maxim Integrated Products 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. Two LDOs in 4mm x 4mm TQFN ♦ Power Up to Eight LEDs Up to 30mA/LED Drive for Backlight Up to 400mA Total Drive for Flash ♦ ...

Page 2

White LED Charge Pumps with Two LDOs in 4mm x 4mm TQFN ABSOLUTE MAXIMUM RATINGS PIN, IN, OUT, REFBP to GND................................-0.3V to +6.0V SETF, SETM, ENLDO, ENM1, ENM2, ENF, P1, P2, LDO1, LDO2 to GND....................-0. M1, M2, ...

Page 3

White LED Charge Pumps with Two ELECTRICAL CHARACTERISTICS (continued 3.6V 0V, ENM1 = ENM2 = ENF = IN GND PGND T = -40°C to +85°C, unless otherwise noted. Typical values are ...

Page 4

White LED Charge Pumps with Two LDOs in 4mm x 4mm TQFN ELECTRICAL CHARACTERISTICS (continued 3.6V 0V, ENM1 = ENM2 = ENF = IN GND PGND T = -40°C to +85°C, ...

Page 5

White LED Charge Pumps with ( 3.6V, circuit of Figure EN_ BATTERY CURRENT vs. SUPPLY VOLTAGE DRIVING FLASH 900 800 700 I = 400mA FLASH 600 500 I = 160mA FLASH 400 I ...

Page 6

White LED Charge Pumps with Two LDOs in 4mm x 4mm TQFN ( 3.6V, circuit of Figure EN_ INDIVIDUAL FLASH LED CURRENT vs. R 2000 200 SETF OPERATING ...

Page 7

White LED Charge Pumps with Two ( 3.6V, circuit of Figure EN_ SINGLE-WIRE DIMMING RESPONSE V ENM1, V ENM2 I OUT V OUT 10ms/div LDO OUTPUT VOLTAGE ACCURACY vs. OUTPUT CURRENT 1.0 0.8 ...

Page 8

White LED Charge Pumps with Two LDOs in 4mm x 4mm TQFN PIN NAME Supply Voltage Input. Bypass to PGND with a 10µF ceramic capacitor. The input voltage range is 1 PIN 2.7V to 5.5V. PIN is high impedance ...

Page 9

... MAX8645Y start switching in 2x mode. When the input voltage rises above 2 approximately 50mV, OUT the MAX8645X/MAX8645Y switch back to 1.5x mode. True Shutdown is a trademark of Maxim Integrated Products, Inc. _______________________________________________________________________________________ LDOs in 4mm x 4mm TQFN FUNCTION The MAX8645X/MAX8645Y include soft-start circuitry to limit inrush current at turn-on. Once the input voltage is ...

Page 10

White LED Charge Pumps with Two LDOs in 4mm x 4mm TQFN INITIAL t HI ≥ 200μ ENM1 AND ENM2 OR t SOFT-START ENF 32/ SHUTDOWN Figure 1. ENM_ and ENF Timing ...

Page 11

White LED Charge Pumps with Two INPUT 2.7V TO 5.5V C1 10μF MAIN ON/OFF AND DIMMING FLASH ON/OFF AND DIMMING ON/OFF VOLTAGE SELECTION Figure 2. Dimming Using Single-Wire, Serial-Pulse Interface INPUT 2.7V TO 5.5V 10μF ON/OFF AND VOLTAGE SELECTION ...

Page 12

White LED Charge Pumps with Two LDOs in 4mm x 4mm TQFN INPUT 2.7V TO 5.5V 10μF ON/OFF AND VOLTAGE SELECTION Figure 4. Schematic for When Fewer than 8 LEDs Are Acceptable Typical operating waveforms shown in the Typical ...

Page 13

White LED Charge Pump with Table 3. Recommended Components for Figure 2 DESIGNATION VALUE MANUFACTURER C1, C5 10µF C3, C4, C6, C7 1µF C8 0.01µF D1–D4 — D5 (D5–D8) — Panasonic SETM SETF required PCB ...

Page 14

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 14 © 2008 Maxim Integrated Products ...

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