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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1802 Datasheet

Digital Camera Step-Down Power Supply

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MAX1802 pdf
19-1850; Rev 0; 10/00
Digital Camera Step-Down
Power Supply
General Description
The MAX1802 provides a complete power-supply solu-
tion for digital still cameras and video cameras by inte-
grating two high-efficiency step-down DC-DC converters
and three auxiliary step-up controllers. This complete
solution is targeted for applications that use either three
to four alkaline cells or two lithium-ion (Li+) cells.
The main step-down DC-DC controller accepts inputs
from 2.5V to 11V and regulates a resistor-adjustable out-
put from 2.7V to 5.5V. It uses a synchronous rectifier to
regulate the output with up to 94% efficiency. An
adjustable operating frequency (up to 1MHz) facilitates
designs for optimum size, cost, and efficiency.
The core step-down DC-DC converter accepts inputs
from 2.7V to 5.5V and regulates a resistor-adjustable
output from 1.25V to 5.5V. It delivers 500mA with up to
94% efficiency.
The three auxiliary step-up controllers can be used to
power the digital camera’s CCD, LCD, and backlight.
The MAX1802 also features expandability by supplying
power, an oscillator signal, and a reference to the
MAX1801, a low-cost slave DC-DC controller that sup-
ports step-up, single-ended primary inductance con-
verter (SEPIC), and fly-back configurations.
The MAX1802 is available in a space-saving 32-pin
TQFP package (5mm x 5mm body), and the MAX1801
is available in an 8-pin SOT-23 package. An evaluation
kit (MAX1802EVKIT) featuring both devices is available
to expedite designs.
________________________Applications
Digital Still Cameras
Digital Video Cameras
Hand-Held Devices
Internet Access Tablets
PDAs
DVD Players
Pin Configuration appears at end of data sheet.
Features
o 2.5V to 11V Input Voltage Range
o Main DC-DC Controller
94% Efficiency
+2.7V to +5.5V Adjustable Output Voltage
Up to 100% Duty Cycle
Independent Shutdown
o Core DC-DC Converter
94% Efficiency
Up to 500mA Load Efficiency
Output Voltage Adjustable Down to 1.25V
Independent Shutdown
o Three Auxiliary DC-DC Controllers
Adjustable Maximum Duty Cycle
Independent Shutdown
o Power, Oscillator, and Reference Outputs to Drive
External Slave Controllers (MAX1801)
o Up to 1MHz Switching Frequency
o 3µA Supply Current in Shutdown Mode
o Internal Soft-Start
o Overload Protection for All DC-DC Converters
o Compact 32-Pin TQFP Package
Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
MAX1802EHJ
-40°C to +85°C 32 TQFP
Note: Refer to the separate data sheet for MAX1801EKA in an 8-
pin SOT.
Typical Operating Circuit
INPUT
2.5V TO 11V
MAX1802
MASTER
MAIN
CORE
CCD
CCFL
TFT
OSC POWER REF
MAX1801
SLAVE
MOTOR
________________________________________________________________ Maxim Integrated Products 1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1802 Datasheet

Digital Camera Step-Down Power Supply

No Preview Available !

MAX1802 pdf
Digital Camera Step-Down
Power Supply
ABSOLUTE MAXIMUM RATINGS
VDDM, VH, ONM to GND .......................................-0.3V to +12V
PGNDM, PGND to GND ........................................-0.3V to +0.3V
VH to VDDM .............................................................-6V to +0.3V
VL to VDDM ............................................................-12V to +0.3V
VL, ONC, ON1, FB_, DCON_ to GND ......................-0.3V to +6V
VDDC, REF, OSC, COMP_ to GND ..............-0.3V to (VL + 0.3V)
DHM, DLM to PGNDM............................-0.3V to (VDDM + 0.3V)
LXM to PGNDM ......................................-0.6V to (VDDM + 0.6V)
DL1, DL2, DL3, LXC to PGND ................-0.3V to (VDDC + 0.3V)
Continuous Power Dissipation (TA = +70°C)
32-Pin TQFP (derate 11.1mW/°C above +70°C)........889mW
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
(Circuit of Figure 1, VVDDM = 6V, VVDDC = 3V, PGNDM = PGND = GND, DCON1 = REF, VONM = 3V, VONC = VON1 = VDCON2 =
VDCON3 = 0, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
GENERAL
Input Voltage Range
SUPPLY CURRENT
SYMBOL
VIN
CONDITIONS
MIN TYP MAX UNITS
2.5 11 V
Shutdown Supply Current
(from VDDM and VDDC)
VONM = 0
3 20 µA
Main DC-DC Converter
Supply Current (from VDDM)
Main DC-DC Converter
Supply Current (from VDDC)
VFBM = 1.5V, VVDDC = 0
VFBM = 1.5V, VVDDC = 3V
VFBM = 1.5V, VVDDC = 3V
370 600
35 55
270 450
µA
µA
Main plus Core Supply Current
(from VDDC)
VFBM = VFBC = 1.5V, VONC = 3V
410 700
µA
Main plus Auxiliary 1
Supply Current (from VDDC)
VFBM = VFB1 = 1.5V, VON1 = 3V
470 750
µA
Main plus Auxiliary 2
Supply Current (from VDDC)
VFBM = VFB2 = 1.5V, VDCON2 = 3V
470 750
µA
Main plus Auxiliary 3
Supply Current (from VDDC)
VFBM = VFB3 = 1.5V, VDCON3 = 3V
470 750
µA
Total Supply Current
(from VDDC)
VL REGULATOR
VL Output Voltage
VL Supply Rejection
VL Undervoltage Lockout
Threshold
VFBM = VFBC = VFB1 = VFB2 = VFB3 = 1.5V,
VONC = VON1 = VDCON2 = VDCON3 = 3V
960 1700
6V < VVDDM < 11V, 0.1mA < ILOAD < 10mA
3.5V < VVDDM < 11V, VVDDC = 0
VL rising, 40mV hysteresis
2.83
2.25
3.00
2.40
3.12
3
2.50
µA
V
%
V
VL Switchover Voltage to
VDDC
VL to VDDC Switch Resistance
VL rising, 100mV hysteresis
2.3 2.4 2.5
7
V
2 _______________________________________________________________________________________


Part Number MAX1802
Description Digital Camera Step-Down Power Supply
Maker Maxim
Total Page 28 Pages
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