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
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)
MAX1832–MAX1835
High-Efficiency Step-Up Converters with
Reverse Battery Protection
________________________________________________________________ Maxim Integrated Products 1
BATT
LXGND
16FB (RST)
5OUT
SHDN
MAX1832
MAX1834
(MAX1833EUT)
(MAX1835)
SOT23
TOP VIEW
2
34
BATT
LXGND
16RST
5OUT
SHDN
MAX1833ETT
TDFN
3mm ✕ 3mm
2
34
Pin Configurations
19-1802; Rev 1; 10/03
EVALUATION KIT
AVAILABLE
Ordering Information
PART T EM P R A N G EPIN -
PA C K A G E
TOP
MARK
MAX1832EUT-T -40°C to +85°C 6 SOT23-6 AAOT
MAX1833EUT-T -40°C to +85°C 6 SOT23-6 AAOU
M A X1 8 3 3E TT30- T -40°C to +85°C 6 TDFN-6 ABX
MAX1834EUT-T -40°C to +85°C 6 SOT23-6 AAOV
MAX1835EUT-T -40°C to +85°C 6 SOT23-6 AAOW
Selector Guide
PART OUTPUT
VOLTAGE
OUTPUT VOLTAGE
IN SHUTDOWN
MAX1832EUT-T Adjustable VBATT
MAX1833EUT-T Fixed 3.3V VBATT
MAX1833ETT30-T Fixed 3.0V VBATT
MAX1834EUT-T Adjustable VBATT - 0.7V
MAX1835EUT-T Fixed 3.3V VBATT - 0.7V
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.
MAX1832–MAX1835
High-Efficiency Step-Up Converters with
Reverse Battery Protection
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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)
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.
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 24.4mW/°C
above +70°C) ............................................................1951mW
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
Output Range VOUT MAX1832/MAX1834 2.0 5.5 V
Battery Input Range VBATT 1.5 5.5 V
TA = +25°C 1.22 1.5
Startup Battery Input Voltage VSU RLOAD = 2.6kΩ
TA = -40°C to +85°C 1.24 V
TA = +25°C 3.225 3.290 3.355
MAX1833EUT/
MAX1835EUT TA = -40°C to +85°C 3.208 3.372
TA = +25°C 2.94 3.0 3.06
Output Voltage VOUT
MAX1833ETT30 TA = -40°C to +85°C 2.925 3.075
V
TA = +25°C 1.208 1.228 1.248
FB Trip Voltage VFB MAX1832/
MAX1834 TA = -40°C to +85°C 1.204 1.252 V
TA = +25°C 3.5 20
FB Input Bias Current IFB
MAX1832/
MAX1834,
VFB = +1.3V TA = -40°C to +85°C 4.0 nA
TA = +25°C 0.4 1.2
N-Channel On-Resistance RNCH VOUT = +3.3V
ILX = 100mA TA = -40°C to +85°C 1.5
Ω
TA = +25°C 0.5 1.3
P-Channel On-Resistance RPCH VOUT = +3.3V
ILX = 100mA TA = -40°C to +85°C 1.6
Ω
P-Channel Catch-Diode Voltage ILX = 100mA, PCH off, VOUT = +3.5V,
VFB = +1.3V 0.73 V
TA = +25°C 435 525 615
N-Channel Switch Current Limit IMAX VOUT = +3.3V TA = -40°C to +85°C 400 650 mA
Switch Maximum On-Time tON 3.5 5 6.5 µs
TA = +25°C 2 17 34
Synchronous Rectifier Zero-
Crossing Current VOUT = +3.3V TA = -40°C to +85°C0 39
mA
TA = +25°C 2.5 7.0
Quiescent Current into OUT
(Note 2)
VOUT = +3.5V,
VFB = +1.3V TA = -40°C to +85°C 8.0 µA
Shutdown Current into OUT VOUT = +3.5V, V SHDN = VFB = 0V 0.05 1 µA
MAX1832–MAX1835
High-Efficiency Step-Up Converters with
Reverse Battery Protection
_______________________________________________________________________________________ 3
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.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Reverse Battery Current into
OUT VOUT = 0, VBATT = V SHDN = VLX = -3V 0 10 µA
TA = +25°C 1.8 5.0
Quiescent Current into BATT VOUT = +3.5V,
VFB = +1.3V TA = -40°C to +85°C 6.0 µA
Shutdown Current into BATT VOUT = +3.5V, VBATT = +2V, V SHDN = 0 0.001 1 µA
Reverse Battery Current into
BATT VOUT = 0, VBATT = V SHDN = VLX = -3V 0.002 10 µA
SHDN Logic Low VBATT = +1.5V to +5.5V 0.3 V
TA = +25°C 1.185 1.228 1.271
SHDN Threshold Rising edge TA = -40°C to +85°C 1.170 1.286 V
SHDN Threshold Hysteresis 0.02 V
SHDN Input Bias Current VOUT = +5.5V, V SHDN = +5.5V, TA = +25°C 13 100 nA
SHDN Reverse Battery Current VOUT = 0, VBATT = V SHDN = VLX = -3V 52 150 µA
TA = +25°C 2.830 2.980 3.110
MAX1833EUT/
MAX1835EUT,
falling edge TA = -40°C to +85°C 2.800 3.140
TA = +25°C 2.580 2.717 2.836
RST Threshold
MAX1833ETT30 TA = -40°C to +85°C 2.553 2.863
V
RST Voltage Low I RST = 1mA, VOUT = +2.5V 0.2 V
TA = +25°C 0.1 100
RST Leakage Current V RST = +5.5V TA = -40°C to +85°C1
nA
TA = +25°C 1 100
LX Leakage Current VLX = +5.5V TA = -40°C to +85°C 100 nA
LX Reverse Battery Current VOUT = 0, VBATT = V SHDN = VLX = -3V 0.001 10 µA
Maximum Load Current ILOAD VBATT = +2V, VOUT = +3.3V 150 mA
Efficiency VBATT = +2V, VOUT = +3.3V, ILOAD = 40mA 90 %
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)
Typical Operating Characteristics
(VOUT = +3.3V, VBATT = +2V, unless otherwise noted.) (Figure 1)
95
65
0.1 10 1001 1000
EFFICIENCY vs. LOAD CURRENT
(VOUT = 5.0V)
MAX1832/35 toc01
ILOAD (mA)
EFFICIENCY (%)
70
75
80
85
90
V
BATT
= +1.5V
VSHDN = VBATT
R1 = 309Ω
R2 = 100kΩ
MAX1834
V
BATT
= +2.7V
V
BATT
= +3.3V
0.1 101 100 1000
EFFICIENCY vs. LOAD CURRENT
(VOUT = 3.3V)
MAX1832/35 toc02
ILOAD (mA)
EFFICIENCY (%)
95
75
80
85
90
V
BATT
= +2.7V
V
BATT
= +1.5V
V
BATT
= +2.0V
VSHDN = VBATT
MAX1835
0.1 101 10 100
EFFICIENCY vs. LOAD CURRENT
(VOUT = 2.5V)
MAX1832/35 toc03
ILOAD (mA)
EFFICIENCY (%)
85
70
75
80
V
BATT
= +2.0V
V
BATT
= +1.5V
VSHDN = VBATT
R1 = 100kΩ
R2 = 100kΩ
CIN = 20µF
COUT = 20µF
MAX1834
0
50
150
100
200
250
132456
MAXIMUM OUTPUT CURRENT
vs. BATTERY VOLTAGE
MAX1832/35 toc04
VBATT (V)
ILOAD (mA)
V
OUT
= +3.3V
V
OUT
= +5.0V
V
OUT
= +2.5V
1.2
10 10k1k100
STARTUP BATTERY VOLTAGE
vs. LOAD RESISTANCE
1.7
1.4
1.3
1.6
1.5
MAX1832/35 toc05
RLOAD (Ω)
VBATT (V)
VSHDN = VBATT
V
OUT
= +5.0V
V
OUT
= +3.3V
V
OUT
= +2.5V
-0.2
0.2
0
0.6
0.4
1.0
0.8
1.2
-6 -4 -3 -2-5 -10123456
INPUT CURRENT AND OUTPUT VOLTAGE
vs. BATTERY VOLTAGE (SHUTDOWN, NO LOAD)
MAX1832/35 toc06
VBATT (V)
IBATT (µA)
I
BATT
VSHDN = 0
RLOAD = ∞
MAX1833
V
OUT
5
4
3
2
1
0
6
-1
V
OUT
(V)
-50
50
0
150
100
250
200
300
-6 -4 -3 -2-5 -10123456
INPUT CURRENT AND OUTPUT VOLTAGE
vs. BATTERY VOLTAGE (SHUTDOWN, LOADED)
MAX1832/35 toc07
VBATT (V)
IBATT (mA)
I
BATT
VSHDN = 0
RLOAD = 22Ω
MAX1833
V
OUT
5
4
3
2
1
0
6
-1
V
OUT
(V)
MAX1832–MAX1835
High-Efficiency Step-Up Converters with
Reverse Battery Protection
4 _______________________________________________________________________________________
-50
50
0
150
100
250
200
300
-6 -4 -3 -2-5 -10123456
INPUT CURRENT AND OUTPUT VOLTAGE
vs. BATTERY VOLTAGE (ON, LOADED)
MAX1832/35 toc09
VBATT (V)
IBATT (mA)
I
BATT
5
4
3
2
1
0
6
-1
V
OUT
(V)
V
OUT
VSHDN =
V
BATT
VOUT = 3.3V
RLOAD = 22Ω
R3 = 1MΩ
R4 = 220kΩ
C1 = 10nF
MAX1832–MAX1835
High-Efficiency Step-Up Converters with
Reverse Battery Protection in a SOT23-6
_______________________________________________________________________________________ 5
2ms/div
ON/OFF RESPONSE
VOUT
1V/div
MAX1832/35 toc10
VSHDN = VBATT = 2.0V, RLOAD = 22Ω,
VOUT = 3.3V
VBATT
1V/div
40µs/div
LOAD TRANSIENT
ILOAD
100mA/div
MAX1832/35 toc11
RLOAD = 22Ω TO 200Ω,
VOUT = +3.3V, VBATT = +2.0V
VOUT
100mV/div
0
40µs/div
LINE TRANSIENT
VOUT
50mV/div
MAX1832/35 toc12
IOUT = 100mA, VOUT = +3.3V,
VBATT = +2.0V TO +2.5V
VBATT
500mV/div
10µs/div
SWITCHING WAVEFORMS
VLX
2V/div
MAX1832/35 toc14
IOUT = 40mA, VOUT = +3.3V, VBATT = +2.0V
VLX
500mA/div
VOUT
100mV/div
40µs/div
SHUTDOWN RESPONSE
VOUT
1V/div
MAX1832/35 toc13
RLOAD = 22Ω, VBATT = 3.3V, VBATT = 2.0V
VSHDN
1V/div
0
0
MAX1833
Typical Operating Characteristics (continued)
(VOUT = +3.3V, VBATT= +2V, unless otherwise noted.) (Figure 1)
MAX1832–MAX1835
High-Efficiency Step-Up Converters with
Reverse Battery Protection
6 _______________________________________________________________________________________
10µH
GND
RST
+1.5V TO +3.3V
OUT OUTPUT
+3.3V
POWER-ON
RESET
BATT
BATTERY
SHDN
LX
MAX1833
MAX1835
100kΩ
10µF
R4
220kΩ
R3
1MΩ
C1
10nF
10µF
10µH
GND
FB
+1.5V TO +5.0V
OUT OUTPUT
+5.0V
BATT
BATTERY
SHDN
LX
MAX1832
MAX1834
R2
309kΩ
R1
100kΩ
R3
1MΩ
R4
220kΩ
C1
10nF
10µF
Pin Description
PIN
MAX1832
MAX1834
MAX1833
MAX1835
NAME FUNCTION
11
SHDN
S hutd ow n. A hi g h l og i c l evel tur ns on the d evi ce. W hen SHD N i s l ow the p ar t i s off,
and the cur r ent i nto BATT i s typ i cal l y 0.1µA. For the M AX 1832/M AX 1833, the
b atter y i s connected to OU T thr oug h an i nter nal P FE T and the exter nal i nd uctor
w hen SHD N i s l ow . SHD N can b e used for l ow - b atter y cutoff ( 1.228V thr eshol d ) .
S ee Low - Batter y C utoff. SHD N has r ever se b atter y p r otecti on.
2 2 BATT Battery Voltage Connection. BATT has reverse battery protection.
3 3 GND Ground
44LX
Inductor Connection. N-channel MOSFET switch drain and synchronous
rectifier P-channel switch drain. LX has reverse battery protection.
5 5 OUT Output Voltage. Bootstrapped supply for the device. Output sense point for
MAX1833/MAX1835.
6—FB MAX1832/MAX1834 Feedback Input. Set the output voltage through a
resistor-divider network. See Setting the Output Voltage.
—6RST 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.
Figure 1a. MAX1833/MAX1835 Typical Operating Circuit Figure 1b. MAX1832/MAX1834 Typical Operating Circuit
Detailed Description
The MAX1832–MAX1835 compact, high-efficiency
step-up converters feature 4µA quiescent supply cur-
rent 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 real-
time clock supply when the converter is off by eliminat-
ing the voltage drop across the PFET body diode.
The MAX1832–MAX1835 are ideal for low-power appli-
cations where ultra-small size is critical. These devices
feature built-in synchronous rectification that signifi-
cantly 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 bat-
teries are connected backwards.
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 out-
put current range. There is no oscillator. The inductor
current is limited by the 0.5A N-channel current limit or
by the 5µs 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.
Reverse Battery Protection
The MAX1832–MAX1835 have a unique proprietary
design that protects the battery, IC, and circuitry pow-
ered by the IC in the event that the input batteries are
connected backwards. When the batteries are connect-
ed 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,
protecting the device and load (Figures 2 and 3).
Previously, this level of protection required additional
circuitry and reduced efficiency due to added compo-
nents in the battery current path.
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 bat-
tery 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 pro-
vide backup power for devices such as an idled micro-
controller, 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 magni-
tude 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 back-
up 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-to-
output current path from the battery to the output,
through the PFET body diode, in shutdown.
Low-Battery Cutoff
The SHDN trip threshold of the MAX1832–MAX1835
can be used as a voltage detector, with a resistor-
divider, 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 100kΩto 1MΩ
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
MAX1832–MAX1835
High-Efficiency Step-Up Converters with
Reverse Battery Protection
_______________________________________________________________________________________ 7
MAX1832–MAX1835
High-Efficiency Step-Up Converters with
Reverse Battery Protection
8 _______________________________________________________________________________________
RESET
1.1V
RST
OUT
SHDN
N
STARTUP
CIRCUITRY
CONTROL
LOGIC DRIVER
MAX1833
MAX1835
1.228V
ERROR
COMPARATOR
P
N
LX
BATT
GND
N
ZERO-
CROSSING
DETECTOR
CURRENT
LIMIT
REVERSE BATTERY
PROTECTION MOSFET
Figure 3. MAX1833/MAX1835 Simplified Functional Diagram
FB
OUT
SHDN
STARTUP
CIRCUITRY
CONTROL
LOGIC DRIVER
MAX1832
MAX1834
1.228V
ERROR
COMPARATOR
P
N
LX
BATT
GND
N
ZERO-
CROSSING
DETECTOR
CURRENT
LIMIT
REVERSE BATTERY
PROTECTION MOSFET
Figure 2. MAX1832/MAX1834 Simplified Functional Diagram
MAX1832–MAX1835
High-Efficiency Step-Up Converters with
Reverse Battery Protection
_______________________________________________________________________________________ 9
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.
Power-On Reset
The MAX1833/MAX1835 provide a power-on reset out-
put (RST). A 100kΩto 1MΩpullup resistor from RST to
OUT provides a logic control signal. This open-drain
output pulls low when the output is 10% below its regu-
lation 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 100kΩto
1MΩ. Calculate R2 as follows:
where VFB = 1.228V.
Inductor Selection
The control scheme of the MAX1832–MAX1835 permits
flexibility in choosing an inductor. A 10µH inductor per-
forms well for most applications, but values from 4.7µH to
100µH may also be used. Small inductance values typi-
cally 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 (5µs) expires.
For maximum output current, choose L such that:
where RIND is the inductor series resistance, and RNCH
is the RDS(ON) of the N-channel MOSFET (0.4Ωtyp).
Capacitor Selection
Choose an output capacitor to achieve the desired out-
put ripple percentage.
where r is the desired output ripple in %. A 10µF ceramic
capacitor is a good starting value. The input capacitor
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 capaci-
tors 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.
Chip Information
TRANSISTOR COUNT: 953
PROCESS: BiCMOS
CLA
rV
OUT OUT
>××
×
05 0525 2
2
..
%
IAVARR
V
OUT MAX
BATT MIN NCH IND
OUT
()
()
.
.
=×−+
()
0 525
2
0 525
2
Vs
ALVs
A
BATT MAX BATT MIN() ()
..
1
0 525
5
0 525
µµ
()
<<
()
RR
V
V
OUT
FB
21 1=−
MANUFACTURER INDUCTOR PHONE
Coilcraft DS1608C-103
DO1606T-103 847-639-6400
Sumida CDRH4D18-100
CR43-100 847-956-0666
Murata LQH4N100K 814-237-1431
Table 1. Suggested Inductors and
Suppliers
VALUE
(µF) DESCRIPTION MANU-
FACTURER PHONE
594/595 D-
series tantalum Sprague 603-224-1961
4.7 to
47 TAJ, TPS-
series tantalum AVX 803-946-0690
4.7 to
10 X7R ceramic TDK 847-390-4373
4.7 to
22 X7R ceramic Taiyo Yuden 408-573-4150
Table 2. Suggested Surface-Mount
Capacitors and Manufacturers
MAX1832–MAX1835
High-Efficiency Step-Up Converters with
Reverse Battery Protection
10 ______________________________________________________________________________________
6LSOT.EPS
F
1
1
21-0058
PACKAGE OUTLINE, SOT-23, 6L
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.)
MAX1832–MAX1835
High-Efficiency Step-Up Converters with
Reverse Battery Protection
______________________________________________________________________________________ 11
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
PROPRIETARY INFORMATION
TITLE:
APPROVAL DOCUMENT CONTROL NO. REV.
2
1
PACKAGE OUTLINE, 6, 8 & 10L,
TDFN, EXPOSED PAD, 3x3x0.80 mm
21-0137 D
L
CL
C
SEMICONDUCTOR
DALLAS
A2
A
PIN 1
INDEX
AREA
D
E
A1
D2
b
E2 [(N/2)-1] x e
REF.
e
k
1N1
L
e
L
A
L
PIN 1 ID
C0.35
DETAIL A
e
NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY
MAX1832–MAX1835
High-Efficiency Step-Up Converters with
Reverse Battery Protection
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
© 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
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.)
DOCUMENT CONTROL NO.APPROVAL
TITLE:
PROPRIETARY INFORMATION
REV.
2
2
COMMON DIMENSIONS
SYMBOL MIN. MAX.
A0.70 0.80
D2.90 3.10
E2.90 3.10
A1 0.00 0.05
L0.20 0.40
PKG. CODE
6
N
T633-1 1.50–0.10
D2
2.30–0.10
E2
0.95 BSC
e
MO229 / WEEA
JEDEC SPEC
0.40–0.05
b
1.90 REF
[(N/2)-1] x e
1.50–0.10 MO229 / WEEC 1.95 REF0.30–0.05
0.65 BSC
2.30–0.10T833-1 8
PACKAGE VARIATIONS
21-0137
0.25–0.05 2.00 REFMO229 / WEED-30.50 BSC1.50–0.10 2.30–0.1010T1033-1
0.25 MIN.
k
A2 0.20 REF.
D
SEMICONDUCTOR
DALLAS
PACKAGE OUTLINE, 6, 8 & 10L,
TDFN, EXPOSED PAD, 3x3x0.80 mm