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19-1802; Rev 1; 10/03
KIT ATION EVALU E AILABL AV
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 current. 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 battery 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.
Features
o Reverse Battery Protection for DC-DC Converter and Load o Up to 90% Efficiency o No External Diode or FETs Needed o Internal Synchronous Rectifier o 4A Quiescent Current o <1A Shutdown Supply Current o +1.5V to +5.5V Input Voltage Range o Accurate SHDN Threshold for Low-Battery Cutoff o BATT Connected to OUT in Shutdown for Backup Power (MAX1832/MAX1833) o RST Output (MAX1833/MAX1835) o Fixed 3.3V/3.0V Output Voltage o Adjustable Output Voltage (MAX1832/MAX1834) o Up to 150mA Output Current o Tiny 6-Pin SOT23 Package o Tiny 6-Pin Thin QFN Package (MAX1833ETT30)
MAX1832-MAX1835
________________________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
Ordering Information
PART MAX1832EUT-T MAX1833EUT-T MAX1833ETT30-T MAX1834EUT-T MAX1835EUT-T TEMP RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C PINPACKAGE 6 SOT23-6 6 SOT23-6 6 TDFN-6 6 SOT23-6 6 SOT23-6 TOP MARK AAOT AAOU ABX AAOV AAOW
Pin Configurations
TOP VIEW
Selector Guide
PART 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
SHDN 1
6
FB (RST)
SHDN 1
6
RST
MAX1832EUT-T MAX1833EUT-T MAX1833ETT30-T MAX1834EUT-T MAX1835EUT-T
MAX1832 5 BATT 2 MAX1834 (MAX1833EUT) (MAX1835)
GND 3 4
OUT
BATT 2
MAX1833ETT
5
OUT
LX
GND 3
4
LX
SOT23
TDFN 3mm 3mm
________________________________________________________________ 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.
High-Efficiency Step-Up Converters with Reverse Battery Protection MAX1832-MAX1835
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 = +70C) 6-Pin SOT23 (derate 9.1mW/C above +70C) ...........727mW 6-Pin 3mm 3mm TDFN (derate 24.4mW/C above +70C) ............................................................1951mW Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) ................................+300C
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 = -40C to +85C. Typical values are at TA = +25C, unless otherwise noted.) (Note 1)
PARAMETER Output Range Battery Input Range Startup Battery Input Voltage SYMBOL VOUT VBATT VSU RLOAD = 2.6k MAX1833EUT/ MAX1835EUT Output Voltage VOUT MAX1833ETT30 FB Trip Voltage VFB MAX1832/ MAX1834 MAX1832/ MAX1834, VFB = +1.3V VOUT = +3.3V ILX = 100mA VOUT = +3.3V ILX = 100mA TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C 0.73 435 400 3.5 VOUT = +3.3V VOUT = +3.5V, VFB = +1.3V TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C 0.05 2 0 2.5 5 17 525 615 650 6.5 34 39 7.0 8.0 1 0.5 3.225 3.208 2.94 2.925 1.208 1.204 3.5 4.0 0.4 1.2 1.5 1.3 1.6 1.228 3.0 CONDITIONS MAX1832/MAX1834 MIN 2.0 1.5 1.22 1.24 3.290 3.355 3.372 3.06 3.075 1.248 1.252 20 nA V mA s mA A A V V TYP MAX 5.5 5.5 1.5 UNITS V V V
FB Input Bias Current
IFB
N-Channel On-Resistance P-Channel On-Resistance P-Channel Catch-Diode Voltage N-Channel Switch Current Limit Switch Maximum On-Time Synchronous Rectifier ZeroCrossing Current Quiescent Current into OUT (Note 2) Shutdown Current into OUT
RNCH RPCH
ILX = 100mA, PCH off, VOUT = +3.5V, VFB = +1.3V IMAX tON VOUT = +3.3V TA = +25C TA = -40C to +85C
VOUT = +3.5V, V SHDN = VFB = 0V
2
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High-Efficiency Step-Up Converters with Reverse Battery Protection
ELECTRICAL CHARACTERISTICS (continued)
(V SHDN = +1.5V, VOUT = +3.3V, VBATT = +2V, GND = 0, TA = -40C to +85C. Typical values are at TA = +25C, unless otherwise noted.) (Note 1)
PARAMETER Reverse Battery Current into OUT 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 VOUT = +5.5V, V SHDN = +5.5V, TA = +25C VOUT = 0, VBATT = V SHDN = VLX = -3V MAX1833EUT/ MAX1835EUT, falling edge MAX1833ETT30 RST Voltage Low RST Leakage Current LX Leakage Current LX Reverse Battery Current Maximum Load Current Efficiency ILOAD TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C 2.830 2.800 2.580 2.553 0.1 1 1 100 0.001 150 90 10 100 2.717 SYMBOL CONDITIONS VOUT = 0, VBATT = V SHDN = VLX = -3V VOUT = +3.5V, VFB = +1.3V TA = +25C TA = -40C to +85C 0.001 0.002 MIN TYP 0 1.8 MAX 10 5.0 6.0 1 10 0.3 1.185 1.170 0.02 13 52 2.980 100 150 3.110 3.140 2.836 2.863 0.2 100 V nA nA A mA % V 1.228 1.271 1.286 UNITS A A A A V V V nA A
MAX1832-MAX1835
VOUT = +3.5V, VBATT = +2V, V SHDN = 0 VOUT = 0, VBATT = V SHDN = VLX = -3V VBATT = +1.5V to +5.5V Rising edge TA = +25C TA = -40C to +85C
RST Threshold
I RST = 1mA, VOUT = +2.5V V RST = +5.5V VLX = +5.5V
VOUT = 0, VBATT = V SHDN = VLX = -3V VBATT = +2V, VOUT = +3.3V VBATT = +2V, VOUT = +3.3V, ILOAD = 40mA
Note 1: All units are 100% production tested at TA=+25C. 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 according to the step-up ratio and efficiency.
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3
High-Efficiency Step-Up Converters with Reverse Battery Protection MAX1832-MAX1835
Typical Operating Characteristics
(VOUT = +3.3V, VBATT = +2V, unless otherwise noted.) (Figure 1)
EFFICIENCY vs. LOAD CURRENT (VOUT = 5.0V)
MAX1832/35 toc01
EFFICIENCY vs. LOAD CURRENT (VOUT = 3.3V)
MAX1832/35 toc02
EFFICIENCY vs. LOAD CURRENT (VOUT = 2.5V)
VBATT = +2.0V 80
MAX1832/35 toc03
95 90 EFFICIENCY (%) 85 80 75 70 65 0.1 1 10 ILOAD (mA) 100 VBATT = +1.5V VSHDN = VBATT R1 = 309 R2 = 100k MAX1834 VBATT = +2.7V VBATT = +3.3V
95
85
90 EFFICIENCY (%)
VBATT = +2.7V
VBATT = +2.0V 85 VBATT = +1.5V 80 VSHDN = VBATT MAX1835
EFFICIENCY (%)
VBATT = +1.5V 75 VSHDN = VBATT R1 = 100k R2 = 100k CIN = 20F COUT = 20F MAX1834 0.1 1 10 ILOAD (mA) 10 100
75 1000 0.1 1 10 ILOAD (mA)
70 100 1000
MAXIMUM OUTPUT CURRENT vs. BATTERY VOLTAGE
MAX1832/35 toc04
STARTUP BATTERY VOLTAGE vs. LOAD RESISTANCE
VSHDN = VBATT 1.6
MAX1832/35 toc05
INPUT CURRENT AND OUTPUT VOLTAGE vs. BATTERY VOLTAGE (SHUTDOWN, NO LOAD)
1.2 1.0 0.8 IBATT (A)
MAX1832/35 toc06
250 VOUT = +2.5V 200 VOUT = +3.3V
1.7
VSHDN = 0 RLOAD = MAX1833 VOUT
6 5 4 3 2 VOUT (V) VOUT (V)
ILOAD (mA)
VBATT (V)
150
1.5
VOUT = +5.0V
0.6 0.4 IBATT 0.2 0
100
VOUT = +5.0V
1.4 VOUT = +3.3V 1.3
1 0 -1 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 VBATT (V)
50
0 1 2 3 4 5 6 VBATT (V)
1.2
VOUT = +2.5V 10 100 RLOAD () 1k 10k
-0.2
INPUT CURRENT AND OUTPUT VOLTAGE vs. BATTERY VOLTAGE (SHUTDOWN, LOADED)
300 250 200 IBATT (mA) 150 100 50 0 -50 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 VBATT (V) IBATT
MAX1832/35 toc07
INPUT CURRENT AND OUTPUT VOLTAGE vs. BATTERY VOLTAGE (ON, NO LOAD)
160 140 120 100 IBATT (A)
MAX1832/35 toc08
INPUT CURRENT AND OUTPUT VOLTAGE vs. BATTERY VOLTAGE (ON, LOADED)
4.0 3.5 3.0 2.5 IBATT (mA) VOUT (V) 300
MAX1832/35 toc09
VSHDN = 0 RLOAD = 22 MAX1833 VOUT
6 5 4 3 2 1 0 -1 VOUT (V)
VSHDN = VBATT RLOAD = R3 = 1M R4 = 220k C1 = 10nF IBATT VOUT
80 60 40 20 0 -20
2.0 1.5 1.0 0.5 IBATT 0 -0.5 5 6
VSHDN = VBATT V = 3.3V 250 OUT RLOAD = 22 R3 = 1M 200 R4 = 220k C1 = 10nF 150 100 50 0 -50
6 5
IBATT
4 3 VOUT 2 1 0 -1
-6 -5 -4 -3 -2 -1 0
1
2
3
4
-6 -5 -4 -3 -2 -1 0
1
2
3
4
5
6
VBATT (V)
VBATT (V)
4
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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)
MAX1832-MAX1835
ON/OFF RESPONSE
MAX1832/35 toc10
LOAD TRANSIENT
MAX1832/35 toc11
VBATT 1V/div
VOUT 100mV/div
VOUT 1V/div
ILOAD 100mA/div 0
2ms/div VSHDN = VBATT = 2.0V, RLOAD = 22, VOUT = 3.3V
40s/div RLOAD = 22 TO 200, VOUT = +3.3V, VBATT = +2.0V
LINE TRANSIENT
MAX1832/35 toc12
SHUTDOWN RESPONSE
MAX1832/35 toc13
VBATT 500mV/div
VSHDN 1V/div 0 VOUT 1V/div
VOUT 50mV/div 0 MAX1833 40s/div IOUT = 100mA, VOUT = +3.3V, VBATT = +2.0V TO +2.5V 40s/div RLOAD = 22, VBATT = 3.3V, VBATT = 2.0V
SWITCHING WAVEFORMS
MAX1832/35 toc14
VLX 500mA/div
VOUT 100mV/div
VLX 2V/div
10s/div IOUT = 40mA, VOUT = +3.3V, VBATT = +2.0V
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5
High-Efficiency Step-Up Converters with Reverse Battery Protection MAX1832-MAX1835
Pin Description
PIN MAX1832 MAX1834 MAX1833 MAX1835 NAME FUNCTION Shutdown. A high logic level turns on the device. When SHDN is low the part is off, and the current into BATT is typically 0.1A. For the MAX1832/MAX1833, the battery is connected to OUT through an internal PFET and the external inductor when SHDN is low. SHDN can be used for low-battery cutoff (1.228V threshold). See Low-Battery Cutoff. SHDN has reverse battery protection. Battery Voltage Connection. BATT has reverse battery protection. Ground Inductor Connection. N-channel MOSFET switch drain and synchronous rectifier P-channel switch drain. LX has reverse battery protection. Output Voltage. Bootstrapped supply for the device. Output sense point for MAX1833/MAX1835. MAX1832/MAX1834 Feedback Input. Set the output voltage through a resistor-divider network. See Setting the Output Voltage. MAX1833/MAX1835 Power-On Reset Open-Drain Output. RST pulls low when the output is 10% below the regulation point. If not used, connect to GND.
1
1
SHDN
2 3 4 5 6 --
2 3 4 5 -- 6
BATT GND LX OUT FB RST
+1.5V TO +3.3V BATTERY 10F 10H LX R4 220k C1 10nF SHDN
+1.5V TO +5.0V BATTERY 10F
BATT OUT 100k RST POWER-ON RESET OUTPUT +3.3V 10F
10H LX
BATT
OUT R2 309k FB R1 100k
OUTPUT +5.0V
MAX1833 MAX1835
R4 220k SHDN R3 1M C1 10nF
MAX1832 MAX1834
R3 1M
GND
GND
Figure 1a. MAX1833/MAX1835 Typical Operating Circuit
Figure 1b. MAX1832/MAX1834 Typical Operating Circuit
6
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High-Efficiency Step-Up Converters with Reverse Battery Protection
Detailed Description
The MAX1832-MAX1835 compact, high-efficiency step-up converters feature 4A quiescent supply current to ensure the highest possible efficiency over a wide load range. With a minimum +1.5V input voltage, these devices are well suited for applications with two alkaline cells, two nickel-metal-hydride (NiMH) cells, or one lithium ion (Li+) cell. For the MAX1832 and MAX1833, the battery is connected to OUT through the inductor and an internal PFET when SHDN is low. This allows the input battery to be used as a backup or realtime clock supply when the converter is off by eliminating the voltage drop across the PFET body diode. The MAX1832-MAX1835 are ideal for low-power applications where ultra-small size is critical. These devices feature built-in synchronous rectification that significantly improves efficiency and reduces size and cost by eliminating the need for an external Schottky diode. Furthermore, these devices are the industry's first boost regulators to offer complete reverse battery protection. This proprietary design protects the battery, IC, and the circuitry powered by the IC in the event the input batteries are connected backwards. protecting the device and load (Figures 2 and 3). Previously, this level of protection required additional circuitry and reduced efficiency due to added components in the battery current path.
MAX1832-MAX1835
Applications Information
Shutdown
When SHDN is low, the device is off and no current is drawn from the battery. When SHDN is high, the device is on. If SHDN is driven from a logic-level output, the logic high (on) level should be referenced to VOUT to avoid intermittent turn on. If SHDN is not used at all, connect it to OUT. With SHDN connected to OUT, the MAX1834/MAX1835 startup voltage (1.65V) is slightly higher, due to the voltage across the PFET body diode. The SHDN pin has reverse battery protection. In shutdown, the MAX1832/MAX1833 connect the battery input to the output through the inductor and the internal synchronous rectifier PFET. This allows the input battery (rather than a separate backup battery) to provide backup power for devices such as an idled microcontroller, SRAM, or real-time clock, without the usual diode forward drop. If the output has a residual voltage during shutdown, a small amount of energy will be transfered from the output back to the input immediately after shutdown. This energy transfer may cause a slight momemntary "bump" in the input voltage. The magnitude and duration of the input bump are related to the ratio of CIN and COUT and the ability of the input to sink current. With battery input sources, the bump will be negligible, but with power-supply inputs (that typically cannot sink current), the bump may be 100s of mV. In shutdown, the MAX1834/MAX1835 do not turn on the internal PFET and thus do not have an output-to-input current path in shutdown. This allows a separate backup battery, such as a Li+ cell, to be diode-connected at the output, without leakage current flowing to the input. The MAX1834/MAX1835 still have the typical input-tooutput current path from the battery to the output, through the PFET body diode, in shutdown.
Control Scheme
A current-limited control scheme is a key feature of the MAX1832-MAX1835. This scheme provides ultra-low quiescent current and high efficiency over a wide output current range. There is no oscillator. The inductor current is limited by the 0.5A N-channel current limit or by the 5s switch maximum on-time. Following each on-cycle, the inductor current must ramp to zero before another cycle may start. When the error comparator senses that the output has fallen below the regulation threshold, another cycle begins. An internal synchronous rectifier eliminates the need for an external Schottky diode reducing cost and board space. While the inductor discharges, the P-channel MOSFET turns on and shunts the MOSFET body diode. As a result, the rectifier voltage drop is significantly reduced, improving efficiency without adding external components.
Low-Battery Cutoff
The SHDN trip threshold of the MAX1832-MAX1835 can be used as a voltage detector, with a resistordivider, to power down the IC when the battery voltage falls to a set level (Figure 1). The SHDN trip threshold is 1.228V. To use a resistor-divider to set the shutdown voltage, select a value for R3 in the 100k to 1M range to minimize battery drain. Calcuate R4 as follows: R4 = R3 (VOFF / VSHDN - 1) VOFF is the battery voltage at which the part will shut down and VSHDN = 1.228V. Note that input ripple can
7
Reverse Battery Protection
The MAX1832-MAX1835 have a unique proprietary design that protects the battery, IC, and circuitry powered by the IC in the event that the input batteries are connected backwards. When the batteries are connected correctly, the reverse battery protection N-channel MOSFET is on and the device operates normally. When the batteries are connected backwards, the reverse battery protection N-channel MOSFET opens,
_______________________________________________________________________________________
High-Efficiency Step-Up Converters with Reverse Battery Protection MAX1832-MAX1835
OUT
STARTUP CIRCUITRY
MAX1832 MAX1834
ZEROCROSSING DETECTOR
P SHDN CONTROL LOGIC DRIVER N REVERSE BATTERY N PROTECTION MOSFET BATT LX
FB ERROR COMPARATOR
1.228V
CURRENT LIMIT
GND
Figure 2. MAX1832/MAX1834 Simplified Functional Diagram
OUT ZEROCROSSING DETECTOR
STARTUP CIRCUITRY
MAX1833 MAX1835
P
CONTROL LOGIC ERROR COMPARATOR
DRIVER
N
LX
1.228V
REVERSE BATTERY N PROTECTION MOSFET
BATT
RST N RESET
CURRENT LIMIT
GND
1.1V
SHDN
Figure 3. MAX1833/MAX1835 Simplified Functional Diagram 8 _______________________________________________________________________________________
High-Efficiency Step-Up Converters with Reverse Battery Protection
sometimes cause false shutdowns. To minimize the effect of ripple, connect a low-value capacitor (C1) from SHDN to GND to filter out input noise. Select a C1 value such that the R4 C1 time constant is above 2ms.
MAX1832-MAX1835
Table 1. Suggested Inductors and Suppliers
MANUFACTURER Coilcraft Sumida Murata INDUCTOR DS1608C-103 DO1606T-103 CDRH4D18-100 CR43-100 LQH4N100K PHONE 847-639-6400 847-956-0666 814-237-1431
Power-On Reset
The MAX1833/MAX1835 provide a power-on reset output (RST). A 100k to 1M pullup resistor from RST to OUT provides a logic control signal. This open-drain output pulls low when the output is 10% below its regulation point. If not used, connect it to GND.
Setting the Output Voltage
The output voltage of the MAX1832/MAX1834 is adjustable from +2V to +5.5V, using external resistors R1 and R2 (Figure 1b). Since FB leakage is 20nA (max), select feedback resistor R1 to be 100k to 1M. Calculate R2 as follows: V R2 = R1 OUT - 1 VFB where VFB = 1.228V.
Table 2. Suggested Surface-Mount Capacitors and Manufacturers
VALUE (F) DESCRIPTION 594/595 Dseries tantalum TAJ, TPSseries tantalum X7R ceramic X7R ceramic MANUFACTURER Sprague AVX TDK Taiyo Yuden PHONE 603-224-1961 803-946-0690 847-390-4373 408-573-4150
4.7 to 47
Inductor Selection
The control scheme of the MAX1832-MAX1835 permits flexibility in choosing an inductor. A 10H inductor performs well for most applications, but values from 4.7H to 100H may also be used. Small inductance values typically offer smaller physical size. Large inductance values minimize output ripple but reduce output power. Output power is reduced when the inductance is large enough to prevent the maximum current limit (525mA) from being reached before the maximum on-time (5s) expires. For maximum output current, choose L such that: VBATT(MAX) (1s) 0.525A 0.525A (RNCH + RIND ) 2 VOUT
4.7 to 10 4.7 to 22
reduces the peak current drawn from the battery and can be the same value as the input capacitor. A larger input capacitor can be used to further reduce ripple and improve efficiency.
PC Board Layout and Grounding
Careful printed circuit layout is important for minimizing ground bounce and noise. Keep the IC's GND pin and the ground leads of the input and output filter capacitors less than 0.2in (5mm) apart. In addition, keep all connections to the FB and LX pins as short as possible. In particular, when using external feedback resistors, locate them as close to FB as possible. To maximize output power and efficiency and minimize output ripple voltage, use a ground plane and solder the IC's GND directly to the ground plane.
IOUT(MAX) = 0.525A x 2
VBATT(MIN) -
where RIND is the inductor series resistance, and RNCH is the RDS(ON) of the N-channel MOSFET (0.4 typ).
Capacitor Selection
Choose an output capacitor to achieve the desired output ripple percentage. COUT > 0.5 x L x 0.525A r% x VOUT 2
2
Chip Information
TRANSISTOR COUNT: 953 PROCESS: BiCMOS
where r is the desired output ripple in %. A 10F ceramic capacitor is a good starting value. The input capacitor
_______________________________________________________________________________________ 9
High-Efficiency Step-Up Converters with Reverse Battery Protection MAX1832-MAX1835
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.)
6LSOT.EPS
PACKAGE OUTLINE, SOT-23, 6L
21-0058
F
1 1
10
______________________________________________________________________________________
High-Efficiency Step-Up Converters with Reverse Battery Protection MAX1832-MAX1835
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) 6, 8, &10L, QFN THIN.EPS
1 2
L D A A2
PIN 1 ID
D2
1
N
1
b
PIN 1 INDEX AREA
C0.35 [(N/2)-1] x e REF. e
E
DETAIL A
E2
A1
k
C L
C L
L e A e
L
SEMICONDUCTOR
PROPRIETARY INFORMATION TITLE:
DALLAS
PACKAGE OUTLINE, 6, 8 & 10L, TDFN, EXPOSED PAD, 3x3x0.80 mm
NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY
APPROVAL DOCUMENT CONTROL NO. REV.
21-0137
D
______________________________________________________________________________________
11
High-Efficiency Step-Up Converters with Reverse Battery Protection MAX1832-MAX1835
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.)
COMMON DIMENSIONS SYMBOL A D E A1 L k A2 MIN. 0.70 2.90 2.90 0.00 0.20 MAX. 0.80 3.10 3.10 0.05 0.40
0.25 MIN. 0.20 REF.
PACKAGE VARIATIONS PKG. CODE T633-1 T833-1 T1033-1 N 6 8 10 D2 1.50-0.10 1.50-0.10 1.50-0.10 E2 2.30-0.10 2.30-0.10 2.30-0.10 e 0.95 BSC 0.65 BSC 0.50 BSC JEDEC SPEC MO229 / WEEA MO229 / WEEC MO229 / WEED-3 b 0.40-0.05 0.30-0.05 0.25-0.05 [(N/2)-1] x e 1.90 REF 1.95 REF 2.00 REF
SEMICONDUCTOR
PROPRIETARY INFORMATION TITLE:
DALLAS
PACKAGE OUTLINE, 6, 8 & 10L, TDFN, EXPOSED PAD, 3x3x0.80 mm
APPROVAL DOCUMENT CONTROL NO. REV.
2 2
21-0137
D
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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