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MAX635ACSA+-MAX635AESA+-MAX635AESA-T-MAX636ACSA+-MAX636ACSA+T-MAX637ACPA+-MAX637ACSA+T
Preset/Adjustable Output CMOS Inverting Switching Regulators
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General Description
The MAX635/MAX636/MAX637 inverting switching regu-
lators are designed for minimum component DC-DC
conversion in the 5mW to 500mW range.
Low power applications require only a diode, output filter
capacitor, and a Iow-cost inductor. An additional
MOSFET and driver are needed for higher power appli-
cations. Low battery detection circuitry is included on
The MAX635/636/637 are preset for -5V, -12V, and -15V
outputs, respectively. However, the regulators can be
set to other levels by adding 2 resistors,
Maxim manufactures a broad line of step-up, step-down,
and inverting DC-DC converters, with features such as
logic-level shutdown, adjustable oscillator frequency,
and external MOSFET drive.
Applications
Minimum Component, High-Efficiency
DC-DC Converters
Portable Instruments
Battery Power Conversion
Board Level DC-DC Conversion
2'ly'l) 2fDtaLdflA]
Features
. Preset AW, -12V, -15V Output Voltages
t Adjustable Output with 2 Reslstors
. 85% Typ Ettleleney
0 Only 3 External Components
0 80M Typ Operating Current
. Low Battery Detector
Ordering Information
PART' TEMP. RANGE PIN-PACKAGE
MAX635XCPA 0°C to +70''C 8 Plastic DIP
MAX635XCSA 0''C to +70''C 8 Narrow SO
MAX635XC/D DC to +70''C Dice
MAX635XEPA -40°C to +85''C 8 Plastic DIP
MAX635XESA -40"C to +85''C 8 Narrow SO
MAX635XEJA -40"C to +850 8 CERDIP
MAX635XMJA -55°C to +1250 8 CERDIP
MAX636XCPA 0°C to +70''C 8 Plastic DIP
MAX636XCSA 0''C to +70°C 8 Narrow SO
MAX636XC/D 0°C to +70''C Dice
MAX636XEPA . -40''C to +85''C 8 Plastic DIP
MAX636XESA -40°C to +85°C 8 Narrow SO
MAX636XEJA -40°C to +85°C 8 CERDIP
MAX636XMJA -55°C to +125°C 8 CERDIP
££9/933’9/9I29WW
'X = A for 5% Output Accuracy, X = B for 10% Output Accuracy.
Ordering Information continued on last page.
Pin $tontiguration Typical Operating Circuit
TopView
AN -t,-'I(-n
q V 8 VFB -ll00T -157
MM 1 El Wil
MMM glqA2CL6,
L80 E MAX635 El VREF MAX637
MAX636
m E MAX637 E Ws 7 vner LX
GNU E E LX LBI GND
DlP/SO L-lo,
+5v T0 -15v CONVERTER
MAXIM Maxim Integrated Products 1
& the latest literature: http://www.maxim-ic.cam,
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ABSOLUTE MAXIMUM RATINGS
Supply Voltage, +Vs (Note 1) ..................... +18V Operating Temperature Range
Input Voltage, LBO, LBI, VFB .......... -O.3V to (+Vs + 0.3V) MAX63_ _C ............................ tYC to +70'C
LX Output Current ........................ 525mA Peak MAX63_ -.E ........................... -40°C to +85'C
LBO Output Current ............................. 50mA MAX63_ -M ......................... -55'C to +125'C
Power Dissipation Storage Temperature ................... -65'C to +160'C
Plastic DIP (derate 8.33mW/‘C above +50°C) ...... 625mW Lead Temperature (Soldering, 10 set.) ............ +300''C
Small Outline (derate 6mW/° C above +50'C) ....... 450mW T
CERDIP (derate 8mW/''C above +50 "C) ........... 800mW
Stresses be nd those listed under "Absolute Maximum Ratings' may cause permanent damage to the device. These are stress ratings only and functional
operation o 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
(TA = +25''C, unless otherwise noted.)
MM635/636/(537
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage (Note 1) +VS 8:}; gggerature lil 12.: V
' No Load, LX Off, .
Supply Current Is OivsTinlgsrature 80 1 50 PA
+vs = +15V 260 500
TA = +25''C 1.24 1.31 1.38
Reference Voltage VREF Over Temperature 1 .20 1 .42 V
No Load, VFB = VREF, +Vs = +5V
Over Temperature
. MAX6352 -4. 75 -5. 0 -5. 25
VOUT Voltage (Note 2) mxgggA 5% Output Accuracy --1141, l j 1% 8 [1152-765 v
MAX635B -4. 5 -5. 0 AM
MAX6368 10% Output Accuracy ~10. 8 -12. 0 -13. 2
MAX637B -13.5 -15.0 -16.5
Efficiency 85 ''/,
Line Regulation (Note 2) +5V<+Vs<+15V 0.5 %VOUT
Load Regulation (Note 2) POUT = OmW to 150mW 0.2 %VOUT
OsciIlatorFrequency fo +VS = +5V 'il/ef/ssl-l) tl 28 ig kHz
Oscillator Duty Cycle +Vs = +5V 40 50 60 %
LX On Resistance RON IX = 100mA, +VS l ++511s/N g lf n
+Vs = +16.5V
LX Leakage Current IXL TA = +25''C 0.01 1.0 uA
Over Temperature 30
VFB Input Bias Current IFB 0.01 10 nA
Low Battery Threshold Wm 1 .31 V
Low Battery Input Bias Current ILBI 0.01 10 nA
V2=+0.4V V3: +1.IV
Low Battery Output Current ILBo a-- - 5°C 1.0 mA
Over Temperature 0.5
Low Battery Output - -
Leakage Current ILBOL V2 - +16.6V, V3 - +1.4V 0.01 3.0 WA
Note 1: In addition to the Absolute Maximum Rating of +18V, the input voltage also must not exceed 24V- I -VOUTI.
Note 2: Guaranteed by correlation with DC pulse' measurements.
2 mnxum
