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Part: MAX1800
Category:
Power Management
-> Regulators
-> Switching Regulators
Description: Digital Camera Step-up Power Supply
Company: Maxim Integrated Products
Datasheet: Download MAX1800 datasheet File size : 750 kB
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Datasheet text preview:
19-1833; Rev 0; 10/00
KIT ATION EVALU BLE AVAILA
Digital Camera Step-Up Power Supply
Features
o +0.7V to +5.5V Input Voltage Range o Main DC-DC Converter 95% Efficiency +2.7V to +5.5V Adjustable Output Voltage 1.5A Load Current o Uncommitted Gain Block for Linear Regulator o Three Independent Auxiliary Step-Up Controllers Adjustable Maximum Duty Cycle o Oscillator and Reference Outputs to Drive External Slave Controllers (MAX1801) o Power-Ready Output o Up to 1MHz Switching Frequency o 1µA Supply Current in Shutdown Mode o Internal Soft-Start Control o Overload Protection for all DC-DC Converters o Compact 32-Pin TQFP Package (5mm x 5mm body)
General Description
The MAX1800 provides a complete power-supply solution for digital still cameras and video cameras. The device integrates a high-efficiency main step-up DC-DC converter, three auxiliary step-up controllers, and an uncommitted gain block that drives an external P-channel MOSFET for a linear regulator. The MAX1800 is targeted for applications that use either two or three primary cells or a single lithium-ion (Li+) battery. The main DC-DC converter accepts inputs from +0.7V to +5.5V and regulates a resistor-adjustable output from 2.7V to 5.5V. It uses an internal synchronous rectifier to regulate the output with 95% efficiency. An adjustable operating frequency facilitates designs for optimum size, cost, and efficiency. The auxiliary step-up controllers can be used to power a digital camera's CCD, LCD, and backlight. The MAX1800 also features expandability by supplying power, oscillator signal, and reference to the MAX1801, a low-cost slave DC-DC controller that supports step-up, SEPIC, and flyback configurations. The MAX1800 is available in a space-saving 32-pin TQFP package (5mm x 5mm body), and the MAX1801 is availa b l e in an 8-pin SOT package. An evaluation kit (MAX1800EVKIT) featuring both devices is available to expedite designs.
MAX1800
Ordering Information
PART MAX1800EHJ TEMP. RANGE -40°C to +85°C PIN-PACKAGE 32 TQFP
________________________Applications
Digital Still Cameras Digital Video Cameras Hand-Held Devices Internet Access Tablets PDAs DVD Players
Pin Configuration
COMP3 DCON3
TOP VIEW
ON3 DL3 FB3
ONA
AO
26
32
31
30
29
28
27
Typical Operating Circuit
CCD INPUT 0.7V TO 5.5V TFT MAX1800 MASTER CCFL CORE MAIN OSC MAX1801 SLAVE REF
PGND DL1 ON1 FB1 COMP1 DCON1 POUT DL2
1 2 3 4
5 6
AI
25
24 ONM 23 RDYM 22 POUT 21 LX
MAX1800
20 LX 19 PGND 18 COMPM 17 FBM
7
8
9 ON2 MOTOR
10 FB2
11 COMP2
12 13 DCON2 OUT
14 REF
15 GND
16 OSC
TQFP
________________________________________________________________ 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.
Digital Camera Step-Up Power Supply MAX1800
ABSOLUTE MAXIMUM RATINGS
OUT, POUT, ON_, DCON_, FB_, RDYM to GND .....-0.3V to +6.0V PGND to GND ......-0.3V to +0.3V OUT to POUT_ ......-0.3V to +0.3V LX, DL_, AO to PGND .....-0.3V to (POUT + 0.3V) REF, OSC, AI, COMP_ to GND.........-0.3V to (OUT + 0.3V) Continuous Power Dissipation (TA = +70°C) 32-Pin TQFP (derate 11mW/°C above +70°C) ...880mW Operating Temperature Range MAX1800EHJ........ -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, VOUT = VPOUT = 3.3V, PGND = GND, VONM = 3.3V, VON1 = VON2 = VON3 = VONA = 0, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER GENERAL Input Voltage Range (Note 2) Minimum Startup Voltage Frequency in Startup Mode SUPPLY CURRENT Shutdown Supply Current Main DC/DC Converter Supply Current Main + Auxiliary 1 Supply Current Main + Auxiliary 2 Supply Current Main + Auxiliary 3 Supply Current Analog Gain Block Supply Current REFERENCE Reference Output Voltage REF Load Regulation REF Line Rejection OSCILLATOR OSC Discharge Trip Level OSC Input Bias Current OSC Discharge Resistance OSC Discharge Pulse Width Rising edge VOSC = 1.1V VOSC = 1.5V, IOSC = 3mA 1.225 1.250 0.01 37 100 1.275 100 75 V nA ns V REF IREF = 20µA 10µA < IREF < 200µA 2.7V < VOUT < 5.5V 0.2 1.23 1.250 1.27 10 5 V mV mV V ONM = 0 VFBM = 1.2V, VOSC = 0 VON1 = 3.3V, VFBM = 1.2V, VFB1 = 1.2V, V OSC = 0 VON2 = 3.3V, VFBM = 1.2V, VFB2 = 1.2V, V OSC = 0 VON3 = 3.3V, VFBM = 1.2V, VFB3 = 1.2V, V OSC = 0 VONA = 3.3V, VFBM = 1.2V, AI = REF, AO open, VOSC = 0 0.002 250 375 375 375 375 5 400 600 600 600 600 µA µA µA µA µA µA VIN V START ILOAD < 1mA, TA = +25oC VOUT = 1.5V 40 0.7 0.9 150 5.5 1.1 300 V V kHz SYMBOL CONDITIONS MIN TYP MAX UNITS
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Digital Camera Step-Up Power Supply
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, VOUT = VPOUT = 3.3V, PGND = GND, VONM = 3.3V, VON1 = VON2 = VON3 = VONA = 0, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS 1.1V < VOUT < 1.8V (ONM only) 1.8V < VOUT < 5.5V 1.1V < VOUT < 1.8V (ONM only) 1.8V < VOUT < 5.5V Input Leakage Current MAIN DC/DC CONVERTER Main Output Voltage Adjust Range Main Undervoltage Lockout Threshold (Note 3) Main Output Maximum Duty Cycle Idle-ModeTM Threshold ERROR AMPLIFIER FBM Regulation Voltage FBM to COMPM Transconductance FBM to COMPM Maximum Voltage Gain FBM Input Leakage Current COMPM Minimum Output Voltage COMPM Maximum Output Voltage POWER SWITCHES POUT Leakage Current LX Leakage Current Switch On- Resistance N-Channel Current Limit P-Channel Turn-Off Current POWER READY RDYM Trip Level RDYM Output High Leakage RDYM Output Voltage Low VFBM rising edge, 1% typical hysteresis VRDYM = 5.5V ISINK = 1mA 1.09 1.125 0.01 1.16 1 0.4 V µA V 40 RON VLX = 0, VPOUT = 5.5V VLX = VOUT = 5.5V N-channel P-channel 0.1 0.1 100 200 2 120 190 20 20 180 350 µA µA m A mA VFBM = 1.35V VFBM = 1.35V, COMPM open VFBM = 1.15V, COMPM open 0.1 2.00 2.15 2.30 Unity gain configuration, FBM = COMPM Unity gain configuration, FBM = COMPM, -5µA < ILOAD < +5µA 1.23 60 1.250 100 2000 0.01 100 1.27 140 V µS V/V nA V V V OUT Rising edge Measured at LX output, VFBM = 1V VOSC = 0.625V 2.7 2.2 80 2.35 85 0.3 5.5 2.6 88 V V % A VIN = 0 or VIN = VOUT = 5.5V VOUT 0.2 1.6 0.01 1 µA MIN TYP MAX 0.2 0.4 UNITS
MAX1800
LOGIC INPUTS (ONM, ON1, ON2, ON3, ONA) Input Low Level VIL V
Input High Level
VIH
V
Idle Mode is a trademark of Maxim Integrated Products.
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