MAX1835.pdf 데이터시트 (총 12 페이지) - 파일 다운로드 MAX1835 데이타시트 다운로드

No Preview Available !

19-1802; Rev 2; 4/05
EVAALVUAAILTAIOBNLEKIT
High-Efficiency Step-Up Converters with
Reverse Battery Protection
General Description
The MAX1832–MAX1835 are high-efficiency step-up
converters with complete reverse battery protection that
protects the device and the load when the battery is
reversed. They feature a built-in synchronous rectifier,
which allows for over 90% efficiency and reduces size
and cost by eliminating the need for an external
Schottky diode.
These step-up converters operate from a +1.5V to +5.5V
input voltage range and deliver up to 150mA of load cur-
rent. The MAX1833EUT/MAX1835EUT (SOT devices)
have a fixed 3.3V output voltage. The MAX1833ETT30
(TDFN device) has a fixed 3.0V output voltage. The
MAX1832/MAX1834 have adjustable outputs from +2V to
+5.5V. In shutdown, the MAX1832/MAX1833 connect the
battery input to the voltage output, allowing the input bat-
tery to be used as a backup or real-time clock supply
when the converter is off (see Selector Guide).
MAX183_EUT devices are available in a miniature 6-pin
SOT23 package. The MAX1833ETT30 is available in a
3mm 3mm thin DFN package. The MAX1832EVKIT is
available to speed designs.
________________________Applications
Medical Diagnostic Equipment
Pagers
Hand-Held Instruments
Remote Wireless Transmitters
Digital Cameras
Cordless Phones
Battery Backup
PC Cards
Local 3.3V or 5V Supply
Pin Configurations
TOP VIEW
SHDN 1
6 FB (RST)
6 54
MAX1832
BATT 2 MAX1834 5 OUT
(MAX1833EUT)
(MAX1835)
GND 3
4 LX
SOT23
MAX1833ETT
1 23
TDFN
3mm 3mm
Features
Reverse Battery Protection for DC-DC Converter
and Load
Up to 90% Efficiency
No External Diode or FETs Needed
Internal Synchronous Rectifier
4µA Quiescent Current
<1µA Shutdown Supply Current
+1.5V to +5.5V Input Voltage Range
Accurate SHDN Threshold for Low-Battery Cutoff
BATT Connected to OUT in Shutdown for Backup
Power (MAX1832/MAX1833)
RST Output (MAX1833/MAX1835)
Fixed 3.3V/3.0V Output Voltage
Adjustable Output Voltage (MAX1832/MAX1834)
Up to 150mA Output Current
Tiny 6-Pin SOT23 Package
Tiny 6-Pin Thin QFN Package (MAX1833ETT30)
Ordering Information
PART
MAX1832EUT-T
MAX1833EUT-T
MAX1833ETT30-T
MAX1834EUT-T
MAX1835EUT-T
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
6 SOT23-6
6 SOT23-6
6 TDFN-6
(T633-1)
6 SOT23-6
6 SOT23-6
TOP
MARK
AAOT
AAOU
ABX
AAOV
AAOW
PART
MAX1832EUT-T
MAX1833EUT-T
MAX1833ETT30-T
MAX1834EUT-T
MAX1835EUT-T
Selector Guide
OUTPUT
VOLTAGE
Adjustable
Fixed 3.3V
Fixed 3.0V
Adjustable
Fixed 3.3V
OUTPUT VOLTAGE
IN SHUTDOWN
VBATT
VBATT
VBATT
VBATT - 0.7V
VBATT - 0.7V
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

No Preview Available !

High-Efficiency Step-Up Converters with
Reverse Battery Protection
ABSOLUTE MAXIMUM RATINGS
BATT, LX to GND.........................................................-6V to +6V
LX to OUT ....................................................................-6V to +1V
SHDN to GND..............................................-6V to (VOUT + 0.3V)
OUT, FB, RST TO GND ............................................-0.3V to +6V
LX Current ................................................................................1A
Continuous Power Dissipation (TA = +70°C)
6-Pin SOT23 (derate 9.1mW/°C above +70°C) ...........727mW
6-Pin 3mm 3mm TDFN (derate 18.2mW/°C
above +70°C) .........................................................1454.5mW
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
(V SHDN = +1.5V, VOUT = +3.3V, VBATT = +2V, GND = 0, TA = -40°C to +85°C. Typical values are at TA = +25°C, unless otherwise
noted.) (Note 1)
PARAMETER
Output Range
Battery Input Range
Startup Battery Input Voltage
Output Voltage
FB Trip Voltage
FB Input Bias Current
N-Channel On-Resistance
P-Channel On-Resistance
P-Channel Catch-Diode Voltage
N-Channel Switch Current Limit
Switch Maximum On-Time
Synchronous Rectifier Zero-
Crossing Current
Quiescent Current into OUT
(Note 2)
Shutdown Current into OUT
SYMBOL
VOUT
VBATT
VSU
VOUT
VFB
IFB
RNCH
RPCH
IMAX
tON
CONDITIONS
MAX1832/MAX1834
RLOAD = 2.6k
MAX1833EUT/
MAX1835EUT
MAX1833ETT30
MAX1832/
MAX1834
MAX1832/
MAX1834,
VFB = +1.3V
VOUT = +3.3V
ILX = 100mA
VOUT = +3.3V
ILX = 100mA
TA = +25°C
TA = -40°C to +85°C
TA = +25°C
TA = -40°C to +85°C
TA = +25°C
TA = -40°C to +85°C
TA = +25°C
TA = -40°C to +85°C
TA = +25°C
TA = -40°C to +85°C
TA = +25°C
TA = -40°C to +85°C
TA = +25°C
TA = -40°C to +85°C
ILX = 100mA, PCH off, VOUT = +3.5V,
VFB = +1.3V
VOUT = +3.3V
TA = +25°C
TA = -40°C to +85°C
VOUT = +3.3V
TA = +25°C
TA = -40°C to +85°C
VOUT = +3.5V,
VFB = +1.3V
TA = +25°C
TA = -40°C to +85°C
VOUT = +3.5V, VSHDN = VFB = 0V
MIN
2.0
1.5
3.225
3.208
2.94
2.925
1.208
1.204
TYP
1.22
1.24
3.290
3.0
1.228
3.5
4.0
0.4
0.5
MAX
5.5
5.5
1.5
3.355
3.372
3.06
3.075
1.248
1.252
20
1.2
1.5
1.3
1.6
UNITS
V
V
V
V
V
nA
0.73 V
435 525 615
400 650
3.5 5 6.5
2 17 34
0 39
2.5 7.0
8.0
0.05 1
mA
µs
mA
µA
µA
2 _______________________________________________________________________________________

No Preview Available !

High-Efficiency Step-Up Converters with
Reverse Battery Protection
ELECTRICAL CHARACTERISTICS (continued)
(V SHDN = +1.5V, VOUT = +3.3V, VBATT = +2V, GND = 0, TA = -40°C to +85°C. Typical values are at TA = +25°C, unless otherwise
noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Reverse Battery Current into
OUT
VOUT = 0, VBATT = VSHDN = VLX = -3V
0 10 µA
Quiescent Current into BATT
Shutdown Current into BATT
Reverse Battery Current into
BATT
SHDN Logic Low
SHDN Threshold
SHDN Threshold Hysteresis
SHDN Input Bias Current
SHDN Reverse Battery Current
RST Threshold
RST Voltage Low
RST Leakage Current
LX Leakage Current
LX Reverse Battery Current
Maximum Load Current
Efficiency
ILOAD
VOUT = +3.5V,
VFB = +1.3V
TA = +25°C
TA = -40°C to +85°C
VOUT = +3.5V, VBATT = +2V, VSHDN = 0
VOUT = 0, VBATT = VSHDN = VLX = -3V
VBATT = +1.5V to +5.5V
Rising edge
TA = +25°C
TA = -40°C to +85°C
VOUT = +5.5V, VSHDN = +5.5V, TA = +25°C
VOUT = 0, VBATT = VSHDN = VLX = -3V
MAX1833EUT/
MAX1835EUT,
falling edge
TA = +25°C
TA = -40°C to +85°C
MAX1833ETT30
TA = +25°C
TA = -40°C to +85°C
IRST = 1mA, VOUT = +2.5V
VRST = +5.5V
TA = +25°C
TA = -40°C to +85°C
VLX = +5.5V
TA = +25°C
TA = -40°C to +85°C
VOUT = 0, VBATT = VSHDN = VLX = -3V
VBATT = +2V, VOUT = +3.3V
VBATT = +2V, VOUT = +3.3V, ILOAD = 40mA
1.8
0.001
5.0
6.0
1
0.002 10
1.185
1.170
2.830
2.800
2.580
2.553
1.228
0.02
13
52
2.980
2.717
0.1
1
1
100
0.001
150
90
0.3
1.271
1.286
100
150
3.110
3.140
2.836
2.863
0.2
100
100
10
µA
µA
µA
V
V
V
nA
µA
V
V
nA
nA
µA
mA
%
Note 1: All units are 100% production tested at TA=+25°C. Limits over the operating temperature range are guaranteed by design
and not production tested.
Note 2: Supply current into OUT. This current correlates directly to the actual battery-supply current, but is reduced in value accord-
ing to the step-up ratio and efficiency.
_______________________________________________________________________________________ 3

No Preview Available !

High-Efficiency Step-Up Converters with
Reverse Battery Protection
(VOUT = +3.3V, VBATT = +2V, unless otherwise noted.) (Figure 1)
Typical Operating Characteristics
EFFICIENCY vs. LOAD CURRENT
(VOUT = 5.0V)
95
EFFICIENCY vs. LOAD CURRENT
(VOUT = 3.3V)
95
EFFICIENCY vs. LOAD CURRENT
(VOUT = 2.5V)
85
90 VBATT = +3.3V
85
80 VBATT = +2.7V
75
70
65
0.1
VBATT = +1.5V
VSHDN = VBATT
R1 = 309
R2 = 100k
MAX1834
1 10 100
ILOAD (mA)
1000
90 VBATT = +2.7V
VBATT = +2.0V
85
VBATT = +1.5V
80
75
0.1
VSHDN = VBATT
MAX1835
1 10 100
ILOAD (mA)
1000
VBATT = +2.0V
80
VBATT = +1.5V
75
70
0.1
1
10
ILOAD (mA)
VSHDN = VBATT
R1 = 100k
R2 = 100k
CIN = 20µF
COUT = 20µF
MAX1834
10 100
MAXIMUM OUTPUT CURRENT
vs. BATTERY VOLTAGE
250
VOUT = +2.5V
200
VOUT = +3.3V
150
100 VOUT = +5.0V
50
0
123 456
VBATT (V)
INPUT CURRENT AND OUTPUT VOLTAGE
vs. BATTERY VOLTAGE (SHUTDOWN, LOADED)
300
VSHDN = 0
250
RLOAD = 22
MAX1833
6MAX1832/35 toc07
5
200 4
VOUT
150 3
100
IBATT
2
50 1
00
-50 -1
-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6
VBATT (V)
STARTUP BATTERY VOLTAGE
vs. LOAD RESISTANCE
1.7
VSHDN = VBATT
1.6
1.5 VOUT = +5.0V
1.4
VOUT = +3.3V
1.3
VOUT = +2.5V
1.2
10 100
1k
RLOAD ()
10k
INPUT CURRENT AND OUTPUT VOLTAGE
vs. BATTERY VOLTAGE (ON, NO LOAD)
140
RLOAD =
120
VOUT
4.0MAX1832/35 toc08
3.5
100 3.0
80 2.5
60 2.0
40 1.5
20 1.0
0 0.5
-20
IBATT
0
-40 -0.5
-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6
VBATT (V)
INPUT CURRENT AND OUTPUT VOLTAGE
vs. BATTERY VOLTAGE (SHUTDOWN, NO LOAD)
1.2
VSHDN = 0
1.0 RLOAD =
MAX1833
6MAX1832/35 toc06
5
0.8
VOUT
4
0.6 3
0.4 2
IBATT
0.2 1
00
-0.2 -1
-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6
VBATT (V)
INPUT CURRENT AND OUTPUT VOLTAGE
vs. BATTERY VOLTAGE (ON, LOADED)
400
RLOAD = 22
350
VOUT
4.0MAX1832/35 toc09
3.5
300 3.0
250 2.5
200 2.0
150 1.5
100
IBATT
1.0
50 0.5
00
-50 -0.5
-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6
VBATT (V)
4 _______________________________________________________________________________________

No Preview Available !

High-Efficiency Step-Up Converters with
Reverse Battery Protection in a SOT23-6
Typical Operating Characteristics (continued)
(VOUT = +3.3V, VBATT= +2V, unless otherwise noted.) (Figure 1)
ON/OFF RESPONSE
MAX1832/35 toc10
LOAD TRANSIENT
MAX1832/35 toc11
VBATT
1V/div
VOUT
100mV/div
VOUT
1V/div
2ms/div
VSHDN = VBATT = 2.0V, RLOAD = 22,
VOUT = 3.3V
LINE TRANSIENT
MAX1832/35 toc12
ILOAD
100mA/div
0
40µs/div
RLOAD = 22TO 200,
VOUT = +3.3V, VBATT = +2.0V
SHUTDOWN RESPONSE
MAX1832/35 toc13
40µs/div
IOUT = 100mA, VOUT = +3.3V,
VBATT = +2.0V TO +2.5V
VBATT
500mV/div
VOUT
50mV/div
VSHDN
1V/div
0
VOUT
1V/div
MAX1833
40µs/div
RLOAD = 22, VBATT = 3.3V, VBATT = 2.0V
0
SWITCHING WAVEFORMS
MAX1832/35 toc14
VLX
500mA/div
VOUT
100mV/div
VLX
2V/div
10µs/div
IOUT = 40mA, VOUT = +3.3V, VBATT = +2.0V
_______________________________________________________________________________________ 5