MAX8645Y Charge Pumps Datasheet

MAX8645Y Datasheet, PDF, Equivalent


Part Number

MAX8645Y

Description

(MAX8645X/Y) 1x/1.5x/2x White LED Charge Pumps

Manufacture

Maxim Integrated Products

Total Page 14 Pages
Datasheet
Download MAX8645Y Datasheet


MAX8645Y
19-3978; Rev 4; 6/08
EVAALVUAAILTAIOBNLEKIT
1x/1.5x/2x White LED Charge Pumps with
Two LDOs in 4mm x 4mm TQFN
General Description
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.
Applications
Camera Phones and Smartphones
Backlighting and Flash
PDAs, Digital Cameras, and Camcorders
Features
Power Up to Eight LEDs
Up to 30mA/LED Drive for Backlight
Up to 400mA Total Drive for Flash
Two Internal Low-Noise 200mA LDOs
94% Max/85% Avg Efficiency (PLED/PBATT) over Li+
Battery Discharge
0.2% Typical LED Current Matching
Adaptive 1x/1.5x/2x Mode Switchover
Single-Wire, Serial-Pulse Interface for Brightness
Control (32 Steps)
Thermal TA Derating Function
Low Input Ripple and EMI
2.7V to 5.5V Supply Voltage Range
Soft-Start, Overvoltage, and Thermal-Shutdown
Protection
28-Pin TQFN, 4mm x 4mm Package
Typical Operating Circuit
1μF 1μF
INPUT
2.7V TO 5.5V
10μF
MAIN ON/OFF
AND DIMMING
FLASH ON/OFF
DUAL-LDO ON/OFF
DUAL-LDO
VOLTAGE
SELECTION
C1P C1N C2P C2N
PIN OUT
IN
OUTPUT
UP TO 580mA
10μF
MAIN FLASH
GND
PGND
MAX8645X
MAX8645Y
ENM1
ENM2
ENF
ENLDO
P1
M1
M2
M3
M4
M5
M6
F1
F2
LDO1
LDO2
P2
SETM SETF
REF
0.01μF
1μF
CAMERA
MODULE
1μF
Ordering Information
PART
MAX8645XETI+
TEMP RANGE
-40°C to +85°C
MAX8645YETI+ -40°C to +85°C
EP = Exposed pad.
+Denotes a lead-free package.
PIN-PACKAGE
28 TQFN-EP
4mm x 4mm
28 TQFN-EP
4mm x 4mm
Pin Configuration appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
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.

MAX8645Y
1x/1.5x/2x 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....................-0.3V to (VIN + 0.3V)
M1, M2, M3, M4, M5, M6, F1,
F2 to GND.............................................-0.3V to (VOUT + 0.3V)
C1N, C2N to GND ......................................... -0.3V to (VIN + 1V)
C1P, C2P
to GND........ -0.3V to the greater of (VOUT + 1V) or (VIN + 1V)
PGND to GND .......................................................-0.3V to +0.3V
OUT, LDO1, LDO2 Short Circuit to GND ...................Continuous
Continuous Power Dissipation (TA = +70°C)
28-Pin TQFN 4mm x 4mm
(derate 20.8mW/°C above +70°C) .............................1666mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
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.
ELECTRICAL CHARACTERISTICS
(VIN = 3.6V, VGND = VPGND = 0V, ENM1 = ENM2 = ENF = IN, RSETM = RSETF = 6.8kΩ, P1 = P2 = unconnected, CREF = 0.01µF,
TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
CONDITIONS
IN Operating Voltage
Undervoltage-Lockout Threshold VIN rising or falling
Undervoltage-Lockout Hysteresis
1MHz switching, no load, 1.5x or 2x mode
Supply Current
1x mode 10% setting, ENF = GND, VENLDO = VIN,
ILDO1 = ILDO2 = 0A
MIN
2.7
2.25
TYP
2.45
130
4.0
0.4
MAX
5.5
2.60
5.5
UNITS
V
V
mV
mA
Shutdown Supply Current
EN_ High Voltage
EN_ Low Voltage
EN_ Input Current
ENM_ or ENF Low Shutdown
Delay tSHDN
ENM_ or ENF tLO
ENM_ or ENF tHI
Initial ENM_ or ENF tHI
P1, P2 Shutdown Input Current
P1, P2 Input Impedance
Thermal-Shutdown Threshold
Thermal-Shutdown Hysteresis
CHARGE PUMP
Overvoltage-Protection Threshold
Soft-Start Time
ENM1 = ENM2 = ENF = GND, VENLDO = VIN,
ILDO1 = ILDO2 = 0A
ENM1 = ENM2 = ENF = ENLDO = GND TA = +25°C
TA = +85°C
VIN = 2.7V to 5.5V
VIN = 2.7V to 5.5V
VEN_ = 0V or 5.5V
TA = +25°C
TA = +85°C
See Figure 1
See Figure 1
See Figure 1
Only required for first ENM_ or ENF pulse; see Figure 1
Temperature rising
VOUT rising
110 µA
0.01 5
0.1
1.4
0.4
0.01 1
0.1
µA
V
V
µA
2.5 ms
0.5 250.0
0.5
200
1
150
+160
20
µs
µs
µs
µA
kΩ
°C
°C
5V
2 ms
2 _______________________________________________________________________________________


Features 19-3978; Rev 3; 12/06 KIT ATION EVALU E L B AVAILA 1x/1.5x/2x White LED Charg e Pumps with Two LDOs in 4mm x 4mm TQFN General Description The MAX8645X/MAX86 45Y charge pumps drive up to eight whit e LEDs with regulated constant current for uniform intensity. The main group o f LEDs (M1–M6) can be driven up to 30 mA per LED for backlighting. The flash group of LEDs (F1 and F2) is independen tly controlled and can be driven up to 200mA per LED (or 400mA total). Two 200 mA LDOs are on-board to provide power f or camera functions. The LDOs’ output voltages are pin programmable to meet different camera-module requirements. T he MAX8645X and MAX8645Y differ only in LDO output voltages. By utilizing adap tive 1x/1.5x/2x chargepump modes and ve ry-low-dropout current regulators, the MAX8645X/MAX8645Y achieve high efficien cy over the full 1-cell lithium-battery voltage range. The 1MHz fixed-frequenc y switching allows for tiny external co mponents, and the regulation scheme is optimized to ensure low EMI .
Keywords MAX8645Y, datasheet, pdf, Maxim Integrated Products, MAX8645X/Y, 1x/1.5x/2x, White, LED, Charge, Pumps, AX8645Y, X8645Y, 8645Y, MAX8645, MAX864, MAX86, Equivalent, stock, pinout, distributor, price, schematic, inventory, databook, Electronic, Components, Parameters, parts, cross reference, chip, Semiconductor, circuit, Electric, manual, substitute




@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)