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MAX1802
User Manual
28 pgs481.02 Kb0

Rainbow Electronics MAX1802 User Manual

General Description
The MAX1802 provides a complete power-supply solu­tion for digital still cameras and video cameras by inte­grating 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 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 sup­ports step-up, single-ended primary inductance con­verter (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
Features
♦ 2.5V to 11V Input Voltage Range
♦ Main DC-DC Controller
94% Efficiency +2.7V to +5.5V Adjustable Output Voltage Up to 100% Duty Cycle Independent Shutdown
♦ Core DC-DC Converter
94% Efficiency Up to 500mA Load Efficiency
Output Voltage Adjustable Down to 1.25V Independent Shutdown
♦ Three Auxiliary DC-DC Controllers
Adjustable Maximum Duty Cycle Independent Shutdown
♦ Power, Oscillator, and Reference Outputs to Drive
External Slave Controllers (MAX1801)
♦ Up to 1MHz Switching Frequency
♦ 3µA Supply Current in Shutdown Mode
♦ Internal Soft-Start
♦ Overload Protection for All DC-DC Converters
♦ Compact 32-Pin TQFP Package
MAX1802
Digital Camera Step-Down
Power Supply
________________________________________________________________ Maxim Integrated Products 1
Typical Operating Circuit
19-1850; Rev 0; 10/00
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.
Ordering Information
Note: Refer to the separate data sheet for MAX1801EKA in an 8­pin SOT.
Pin Configuration appears at end of data sheet.
32 TQFP
PIN-PACKAGETEMP. RANGE
-40°C to +85°CMAX1802EHJ
PART
MAIN
INPUT
2.5V TO 11V
OSC POWER REF
MAX1802
MASTER
CORE
CCD
CCFL
TFT
MAX1801
SLAVE
MOTOR
MAX1802
Digital Camera Step-Down Power Supply
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V
VDDM
= 6V, V
VDDC
= 3V, PGNDM = PGND = GND, DCON1 = REF, V
ONM
= 3V, V
ONC
= V
ON1
= V
DCON2
=
V
DCON3
= 0, TA= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°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.
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
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
GENERAL Input Voltage Range V
IN
2.5 11 V
SUPPLY CURRENT Shutdown Supply Current
(from VDDM and VDDC)
Main DC-DC Converter Supply Current (from VDDM)
Main DC-DC Converter Supply Current (from VDDC)
Main plus Core Supply Current (from VDDC)
Main plus Auxiliary 1
Supply Current (from VDDC)
Main plus Auxiliary 2
Supply Current (from VDDC)
Main plus Auxiliary 3
Supply Current (from VDDC)
Total Supply Current (from VDDC)
V
V
V
V
V
V
= 0 3 20 µA
ONM
V
= 1.5V, V
FBM
V
= 1.5V, V
FBM
= 1.5V, V
FBM
= V
FBM
FBC
= V
FBM
FB1
= V
FBM
FB2
= V
FBM
FB3
V
= V
FBM
ONC
= V
FBC
ON1
V VL REGULATOR VL Output Voltage 6V < V
VL Supply Rejection 3.5V < V VL Undervoltage Lockout
Threshold
VL Switchover Voltage to
VDDC
VL rising, 40mV hysteresis 2.25 2.40 2.50 V
VL rising, 100mV hysteresis 2.3 2.4 2.5 V
< 11V, 0.1mA < I
VDDM
VDDM
VL to VDDC Switch Resistance 7 Ω
= 0 370 600
VDDC
= 3V 35 55
VDDC
= 3V 270 450 µA
VDDC
= 1.5V, V
= 1.5V, V
= 1.5V, V
= 1.5V, V
= V
FB1
= V
DCON2
< 11V, V
= 3V 410 700 µA
ONC
= 3V 470 750 µA
ON1
= 3V 470 750 µA
DCON2
= 3V 470 750 µA
DCON3
= V
= V
FB2
= V
VDDC
= 1.5V,
FB3
= 3V
DCON3
< 10mA 2.83 3.00 3.12 V
LOAD
= 0 3 %
960 1700 µA
µA
MAX1802
Digital Camera Step-Down
Power Supply
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V
VDDM
= 6V, V
VDDC
= 3V, PGNDM = PGND = GND, DCON1 = REF, V
ONM
= 3V, V
ONC
= V
ON1
= V
DCON2
=
V
DCON3
= 0, TA= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
)
Idle Mode is a trademark of Maxim Integrated Products.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
REFERENCE Reference Output Voltage V REF Load Regulation 10µA < REF Line Rejection 2.7V < V
REF Undervoltage Lockout
Threshold
OSCILLATOR OSC Discharge Trip Level OSC rising 1.225 1.250 1.275 V OSC Input Bias Current V OSC Discharge Resistance V OSC Discharge Pulse Width 100 ns LOGIC INPUTS (ONM, ONC, ON1) Input Low Level V
Input High Level V
Input Leakage Current
MAIN DC-DC CONVERTER Main Output Voltage Adjust
Range
Main Idle Mode™ Threshold
Main Current-Sense Amplifier Voltage Gain
Main N Channel Turn-Off
Threshold
Main Slope Compensation
Gain
MAIN ERROR AMPLIFIER FBM Regulation Voltage Unity gain configuration, FBM = COMPM 1.233 1.248 1.263 V
FBM to COMPM
Transconductance
FBM Input Leakage Current V COMPM Minimum Output
Voltage
COMPM Maximum Output
Voltage
I
REF
= 20µA 1.235 1.248 1.260 V
REF
< 200µA 5 9 mV
I
REF
< 5.5V 1 5 mV
OUT
REF rising, 20mV hysteresis 0.9 1 1.1 V
= 1.1V 0.2 100 nA
OSC
= 1.5V 30 100 Ω
OSC
0.4 V ONM 1.8 ONC, ON1 1.6
ONM: V
ONC, ON1: V
= 0 or 11V;
IN
IN
= 0 or 5V
0.01 1 µA
2.7 5.5 V
V
= 0.625V, measured between VDDM
OSC
and LXM
8 20 32 mV
Measured between VDDM and LXM 8.4 9.3 10.2 V/V
V
A
VCSM
IL
IH
OUT
Measured between LXM and PGNDM -26 -17 -8 mV
A
VSWM
G
EA
V
V
COMPM (MAX
0.16 0.20 0.24 V/V
Unity gain configuration, FBM = COMPM,
-5µA < I
FBM
FBM
V
FBM
< 5µA
LOAD
= 1.35V 5 100 nA
= 1.35V, COMPM open 0.3 V
= 1.15V, COMPM open 2.00 2.14 2.27 V
70 100 160 µS
V
MAX1802
Digital Camera Step-Down Power Supply
4 _______________________________________________________________________________________
)
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V
VDDM
= 6V, V
VDDC
= 3V, PGNDM = PGND = GND, DCON1 = REF, V
ONM
= 3V, V
ONC
= V
ON1
= V
DCON2
=
V
DCON3
= 0, TA= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
MAIN SOFT-START
Soft-Start Interval OSC falling edge 1024
MAIN DRIVERS (DHM, DLM)
Output Low Voltage I
Output High Voltage I
= 10mA 0.11 V
SINK
= 10mA
SOURCE
V
VDDM
0.11
-
OSC
cycles
V
Driver Resistance I
Drive Current
CORE DC-DC CONVERTER (V Core Output Voltage Adjust
Range
= 3V)
ONC
V
OUT
Core Idle Mode Threshold V Core Current-Sense Amplifier
Transresistance Core Slope Compensation Gain A CORE ERROR AMPLIFIER (V
ONC
R
CSC
VSWC
= 3V)
= 10mA, I
DHM
Sourcing or sinking,
or VVL = V
V
DHM
= 10mA 4 11 Ω
DLM
VDDM
/ 2
400 mA
1.25 5.5 V
= 0.625V 70 190 320 mA
OSC
0.7 1.0 1.3 V/A
0.16 0.20 0.24 V/V
FBC Regulation Voltage Unity gain configuration, FBC = COMPC 1.233 1.248 1.263 V FBC to COMPC
Transconductance
FBC Input Leakage Current V
COMPC Minimum Output Voltage
COMPC Maximum Output Voltage
CORE SOFT-START (V
Soft-Start Interval 1024
CORE POWER SWITCHES (V
LXC Leakage Current V
Switch On-Resistance
P-Channel Current Limit V
N-Channel Turn-Off Current 18 100 180 mA
ONC
= 3V)
ONC
G
EA
V
COMPM (MAX
= 3V)
R
DSN
R
DSP
Unity gain configuration, FBC = COMPC,
-5µA < I
FBC
V
FBC
V
FBC
LXC
N-channel, I
P-channel, I
OSC
< 5µA
LOAD
= 1.35V 5 100 nA
= 1.35V, COMPC open 0.3 V
= 1.15V, COMPC open 2.00 2.14 2.27 V
= 0, 5.5V 0.01 20 µA
= 0.75A 150 350
LXC
= 0.75A 180 400
LXC
= 0.625V 0.75 A
70 100 160 µS
OSC
cycles
mΩ
MAX1802
Digital Camera Step-Down
Power Supply
_______________________________________________________________________________________ 5
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V
VDDM
= 6V, V
VDDC
= 3V, PGNDM = PGND = GND, DCON1 = REF, V
ONM
= 3V, V
ONC
= V
ON1
= V
DCON2
=
V
DCON3
= 0, TA= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
AUXILIARY DC-DC CONTROLLERS 1, 2, 3 (V
ON1
= V
_ = 3V)
CON
INTERNAL CLOCK OSC Clock Low Trip Level OSC falling edge 0.2 0.25 0.3 V
V
_ = 0.625V 0.575 0.625 0.675
DCON
OSC Clock High Trip Level
Maximum Duty Cycle Adjustment Range
Maximum Duty Cycle V
Default Maximum Duty Cycle V
DCON_ Input Leakage Current V DCON_ Input Sleep-Mode
Threshold
V
V
_ = 1.25V to V
DCON
_ = 0.625V 43 %
DCON
_ = 1.25V to V
DCON
_ = 0V to 3V 0.01 1 µA
DCON
_ rising, 50mV hysteresis 0.35 0.4 0.45 V
DCON
VL
VL
1.00 1.05 1.10
40 90
76 %
V
%
AUXILIARY ERROR AMPLIFIER FB_ Regulation Voltage Unity gain configuration, FB_ = COMP_ 1.233 1.248 1.263 V
FB_ to COMP_
Transconductance
G
FB_ Input Leakage Current V
Unity gain configuration, FB_ = COMP_,
EA
-5µA < ILOAD < 5µA
_ = 1.35V 5 100 nA
FB
70 100 160 µs
AUXILIARY DRIVERS (DL1, DL2, DL3) DL_ Driver Resistance Output high or low 4 11 Ω DL_ Drive Current Sourcing or sinking, V
DL
_ = V
/ 2 400 mA
VDDC
AUXILIARY SOFT-START
Soft-Start Interval 1024
AUXILIARY SHORT-CIRCUIT PROTECTION
Fault Interval 1024
OSC
cycles
OSC
cycles
MAX1802
Digital Camera Step-Down Power Supply
6 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V
VDDM
= 6V, V
VDDC
= 3V, PGNDM = PGND = GND, DCON1 = REF, V
ONM
= 3V, V
ONC
= V
ON1
= V
DCON2
=
V
DCON3
= 0, TA = -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER
GENERAL Input Voltage Range V SUPPLY CURRENT
Shutdown Supply Current (from VDDM and VDDC)
Main DC-DC Converter Supply Current (from VDDM)
Main DC-DC Converter Supply Current (from VDDC)
Main plus Core Supply Current (from VDDC)
Main plus Auxiliary 1 Supply
Current (from VDDC)
Main plus Auxiliary 2 Supply
Current (from VDDC)
Main plus Auxiliary 3 Supply
Current (from VDDC)
Total Supply Current (from VDDC)
VL REGULATOR
VL Output Voltage
VL Supply Rejection 3.5V < V VL Undervoltage Lockout
Threshold
VL Switchover Voltage to VDDC V VL to VDDC Switch Resistance 7 Ω REFERENCE Reference Output Voltage V REF Load Regulation 10µA < I REF Line Rejection 2.7V < V REF Undervoltage Lockout
Threshold
OSCILLATOR OSC Discharge Trip Level OSC rising 1.225 1.275 V OSC Input Bias Current V OSC Discharge Resistance V
SYMBOL
IN
V
V
V
V
V
V
V
REF
2.5 11 V
= 0 20 µA
ONM
V
= 1.5V, V
FBM
V
= 1.5V, V
FBM
= 1.5V, V
FBM
= V
FBM
= V
FBM
= V
FBM
= V
FBM
V
= V
FBM
= V
V
ONC
V
DCON3
6V < V
VDDM
0.1mA < I
rising, 40mV hysteresis 2.25 2.50 V
L
rising, 100mV hysteresis 2.3 2.5 V
L
I
= 20µA 1.230 1.262 V
REF
CONDITIONS
= 0 600
VDDC
= 3V 55
VDDC
= 3V 450 µA
VDDC
= 1.5V, V
FBC
= 1.5V, V
FB1
= 1.5V, V
FB2
= 1.5V, V
FB3
= V
FBC
FB1
= V
ON1
= 3V
LOAD
VDDM
REF
OUT
DCON1
< 11V,
< 10mA
< 11V, V
< 200µA 9 mV
< 5.5V 5 mV
= 3V 700 µA
ONC
= V
ON1
DCON1
= 3V 750 µA
DCON2
= 3V 750 µA
DCON3
= V
= V
FB2
= V
DCON2
= 0 3 %
VDDC
= 3V 750 µA
= 1.5V,
FB3
=
MIN
TYP MAX UNITS
1700 µA
2.83 3.12 V
REF rising, 20mV hysteresis 0.9 1.1 V
= 1.1V 100 nA
OSC
= 1.5V 100 Ω
OSC
µA
MAX1802
Digital Camera Step-Down
Power Supply
_______________________________________________________________________________________ 7
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V
VDDM
= 6V, V
VDDC
= 3V, PGNDM = PGND = GND, DCON1 = REF, V
ONM
= 3V, V
ONC
= V
ON1
= V
DCON2
=
V
DCON3
= 0, TA = -40°C to +85°C, unless otherwise noted.) (Note 1)
)
PARAMETER
LOGIC INPUTS (ONM, ONC, ON1) Input Low Level V
Input High Level V
Input Leakage Current
MAIN DC-DC CONVERTER Main Output Voltage Adjust Range V
Main Idle Mode Threshold
Main Current-Sense Amplifier Voltage Gain
Main Zero-Crossing Threshold Measured between LXM and PGNDM -20 -8 mV Main Slope Compensation Gain A MAIN ERROR AMPLIFIER FBM Regulation Voltage Unity gain configuration, FBM = COMPM 1.230 1.265 V
FBM to COMPM
Transconductance
FBM Input Leakage Current V COMPM Minimum Output
Voltage
COMPM Maximum Output Voltage
MAIN DRIVERS (DHM, DLM) Output Low Voltage I
Output High Voltage I
Driver Resistance I CORE DC-DC CONVERTER (V
Core Output Voltage Adjust
Range
Core Idle Mode Threshold V Core Current-Sense Amplifier
Transresistance Core Slope Compensation Gain A
CORE ERROR AMPLIFIER (V FBC Regulation Voltage Unity gain configuration, FBC = COMPC 1.230 1.265 V
FBC to COMPC
Transconductance
SYMBOL
IL
IH
0.4 V ONM 1.8 ONC, ON1 1.6
ONM: V
ONC, ON1: V
CONDITIONS
= 0 or 11V;
IN
IN
= 0 or 5V
MIN TYP MAX UNITS
1 µA
V
OUT
A
VCSM
VSWM
G
EA
V
V
COMPM(MAX
= 3V)
ONC
V
OUT
R
CSC
VSWC
= 3V)
ONC
G
EA
2.7 5.5 V
V
= 0.625V, measured between
OSC
VDDM and LXM
2 35 mV
Measured between VDDM and LXM 8.4 10.2 V/V
0.16 0.24 V/V
U ni ty g ai n confi g ur ati on, FBM = C OM P M ,
- 5µA < I
FBM
FBM
V
FBM
SINK
SOURCE
DHM
< 5µA
LOA D
= 1.35V 100 nA
= 1.35V, COMPM open 0.3 V
= 1.15V, COMPM open 2.00 2.27 V
= 10mA 0.11 V
= 10mA
= 10mA, I
= 10mA 11 Ω
DLM
70 160 µS
V
-
VDDM
0.11
V
1.25 5.5 V
= 0.625V 40 360 mA
OSC
0.7 1.3 V/A
0.16 0.24 V/V
U ni ty g ai n confi g ur ati on, FBC = C OM P C ,
- 5µA < I
LOA D
< 5µA
70 160 µS
MAX1802
Digital Camera Step-Down Power Supply
8 _______________________________________________________________________________________
)
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V
VDDM
= 6V, V
VDDC
= 3V, PGNDM = PGND = GND, DCON1 = REF, V
ONM
= 3V, V
ONC
= V
ON1
= V
DCON2
=
V
DCON3
= 0, TA = -40°C to +85°C, unless otherwise noted.) (Note 1)
Note 1: Specifications to -40°C are guaranteed by design and not production tested.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
FBC Input Leakage Current V COMPC Minimum Output
Voltage
COMPC Maximum Output
Voltage
CORE POWER SWITCHES (V LXC Leakage Current V
Switch On-Resistance
N-Channel Turn-Off Current 5 190 mA AUXILIARY DC-DC CONTROLLERS 1, 2, 3 (V INTERNAL CLOCK OSC Clock Low Trip Level OSC falling edge 0.2 0.3 V
OSC Clock High Trip Level
Maximum Duty Cycle Adjustment Range
DCON_ Input Leakage Current V DCON_ Input Sleep-Mode
Threshold
AUXILIARY ERROR AMPLIFIER
ONC
= 1.35V 100 nA
FBC
V
V
COMPC(MAX
= 3V)
R
DSN
R
DSP
ON1
V
= 1.35V, COMPC open 0.3 V
FBC
V
= 1.15V, COMPC open 2.00 2.27 V
FBC
= 0, 5.5V 20 µA
LXC
N-channel, I P-channel, I
= V
DCON
V
_ = 0.625V 0.575 0.675 V
DCON
V
_ = 1.25V to V
DCON
_ = 0V to 3V 1 µA
DCON
_ rising, 50mV hysteresis 0.35 0.45 V
DCON
= 0.75A 350
LXC
= 0.75A 400
LXC
_= 3V)
VL
1.00 1.10
40 90
mΩ
%
FB_ Regulation Voltage Unity gain configuration, FB_ = COMP_ 1.230 1.265 V
FB_ to COMP_
Transconductance
G
EA
FB_ Input Leakage Current V
Unity gain configuration, FB_ = COMP_,
LOAD
< 5µA
-5µA < I
_ = 1.35V 100 nA
FB
70 160 µs
AUXILIARY DRIVERS (DL1, DL2, DL3) DL_ Driver Resistance Output high or low 11 Ω
MAX1802
Digital Camera Step-Down
Power Supply
_______________________________________________________________________________________ 9
Typical Operating Characteristics
(Circuit of Figure 1, V
VDDM
= 6V, V
VDDC
= 3.3V, V
ONM
= 3V, V
ONC
= V
ON1
= V
DCON2
= V
DCON3
= 0, TA = +25°C, unless otherwise
noted.)
100
0
1 10 100 1000 10,000
EFFICIENCY vs. LOAD CURRENT
(MAIN CONVERTER)
20
MAX1802 toc01
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
70
50
30
10
90
V
OUT
= 3.3V
VIN = +5V
VIN = +7.2V
VIN = +11V
100
0
1 10 100 1000 10,000
EFFICIENCY vs. LOAD CURRENT
(MAIN CONVERTER)
20
MAX1802 toc02
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
70
50
30
10
90
V
OUT
= +5V
VIN = +7.2V
VIN = +11V
100
0
1 10 100 1000
EFFICIENCY vs. LOAD CURRENT
(CORE CONVERTER)
20
MAX1802 toc04
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
70
50
30
10
90
VIN = +5V
VIN = +3.3V
V
OUT
= +2.5V
0
20
60
40
80
100
0.4 0.6 0.70.5 0.8 0.9 1.0 1.1 1.2
MAXIMUM DUTY CYCLE vs. V
DCON
_
MAX1802 toc05
V
DCON
_ (V)
MAXIMUM DUTY CYCLE (%)
0
20
60
40
80
100
0 400200 600 800 1000
DEFAULT MAXIMUM DUTY CYCLE
vs. FREQUENCY
MAX1802 toc06
FREQUENCY (kHz)
DEFAULT MAXIMUM DUTY CYCLE (%)
C
OSC
= 470pF
1000
0
1 10 100 1000
OSCILLATOR FREQUENCY
vs. R
OSC
200
MAX1802 toc07
R
OSC
(kΩ)
OSCILLATOR FREQUENCY (kHz)
400
600
800
C
OSC
= 470pF
C
OSC
= 220pF
C
OSC
= 100pF
C
OSC
= 47pF
0
2
6
4
8
10
042681012
MAX1802 toc08
INPUT VOLTAGE (V)
SHUTDOWN CURRENT (µA)
SHUTDOWN CURRENT
vs. INPUT VOLTAGE
EFFICIENCY vs. LOAD CURRENT
(CORE CONVERTER)
100
90
80
70
60
50
40
EFFICIENCY (%)
30
20
10
0
1 10 100 1000
VIN = +5V
VIN = +2.5V
VIN = +3.3V
LOAD CURRENT (mA)
MAX1802 toc03
V
= +1.8V
OUT
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