MAX722CSE+ ,3.3V/5V Palmtop Computer and LCD Power-Supply Regulatorapplications that reqUIre a MAX722ESE -40°C to +85''C 16 Narrow SO
+12Voutputvoltage, refertothe M ..
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MB4752A ,SUBSCRIBER LINE INTERFACE IC" mm;
gr T$544-A874
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MB4M ,MINIATURE GLASS PASSIVATED SINGLE-PHASE BRIDGE RECTIFIERapplications0.205 (5.21)0.179 (4.55)0.195 (4.95)Mechanical Data0.049 (1.24)0.039 (0.99)0.106 (2.70) ..
MAX722CSE+
3.3V/5V Palmtop Computer and LCD Power-Supply Regulator
19-0040: Rev (t 6/92
2fly'lLai'aLflyll
Palmtop Computer and LCD
General Description
The MAX722 and MAX723 CMOS power-supply ICs Cre-
ate dual regulated DC outputs for small, battery-operated
microprocessor systems. Each device generates a main
output (3V or 5V, selectable) and a negative auxiliary
output that is adjustable for LCDs. Each device accepts
two input voltages, Power can come from a main battery
(two or three alkaline or NiCad), or an unregulated DC
source such as an AC-DC wall adapter.
The MAX722/MAX723 provide three improvements over
prior-art devices. Physical size is reduced; the high switch-
ingfrequencies(uptoO.5MHz),made possible by MOSFET
power transistors, allow for tiny (<5mm diameter) surface-
mount magnetics. Efficiency is also improved to 87% (10%
better than with low-voltage regulators made in bipolar
technology). And supply current is reduced to 60pA by
CMOS construction and a unique constant-off-lime pulse-
frequency modulation (PFM) control scheme,
The MAX722 and MAX723 differ only in the lower fixed
output voltage of the main regulator, with a 3.3V output
for the MAX722 and a 3.0V output for the MAX723.
For flash memory or PCMCIA applications that require a
+ 1 2Voutput voltage, refer to the MAX717-721 data sheet.
Applications
Palmtop Computers
LCD Contrast Control
Portable Data-Collection Equipment
Portable Data Communicators
Medical Instrumentation
Bar-Code Scanners
Pin Configure tion
Power-Supply Regulators
Features
. Low 0.9V to 5.5V Battery Input Range
. Unregulated 7V to 20V DC Input Range
. Dual Re egulated3 Out Vuts
Main utpyt;
Auxiliary Outpust: vg7, to -100V
t 87% Etticieney at 200mA
. Efficient PRAM Keep-Alive: 80% at1mA
. 8W/in3 Power Density
. 6011A Quiescent Current
. 2011A Shutdown Mode with VREF Alive
. 500kHz Maximum Switching Frequency
. _+1.5% VREF Tolerance (Over Temp.)
. Detect Output Power Failures
. 16-Pin Narrow SO Packages
Ordering Information
PART TEMP. RANGE PIN-PACKAGE
I MAX722CSE 0°C to not Iarrow so
MAX722C/D 0°C to +70°C Ulce'
MAX722ESE -40“C to +85°C 16 Narrow SO
MAX723CSE 0'C lo +70'C 16 Narrow SO
MAX723C/D (YC to +70°c Dice'
MAX723ESE -40“C to +85°C 16 Narrow SO
MAX722EVKIT-SO 00 to +70°c 2f,tatt,ti,'fSt
'Contact factory for dice specifications.
Typical Operating Circuit
MAIN I 22pH F
OUTPU ' u m w css
i MAXIM
= MAX722CS_
TOPVIEW .
m E E w Fil DHI V 33111”
NEGON 2 15 m t
J z: DLOW 47W" I
3/5 3 MAXIM El GND = tr
PF-O 4 MAX722 E LIN LIN =
WIFE Ti MAX723 E] DLOW FBN
AGND 1 DHI " f
= E VREF
F83 l E cr I
FBN E E CS" "iffflflly i CONTRELINPUTSO)
(WALL ADAPTOR) GND PFO POWER FAIL
so g DETEC TOUTPUT
MAXIM Maximlntegrated Products 1
a the latest literature: http://wwwmaxim-ic.com,
http://www.
EZAXVW/ZZAXVW
Palmtop Computer and LCD
Power-Supply Regulators
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V+ to GND) ................... +7V, -O.3V
Switch Voltage (LX3 to GND) ................... +7V, -0.3V
Linear Regulator Voltage (LIN to GND) .......... +20V, -O.3V
Auxiliary Pin Voltaggs
(NEGON, F83, 3/5, SHDN, FBN, DHI, DLOW, VREF,
PFO, CS+, CS- to GND) .............. -O.3V to (V+ + 0.3V)
Ground Voltage Difference (AGND to GND) _ _ . . . . . . . ' . t02V
Feedback Input Current (FBN) ................... +_10mA
Reference Current (|VREF) ...................... 2.5mA
Continuous Power Dissipation (TA = +70°C)
Narrow SO (derate 8.70mW/'C above +70"C) ...... 696mW
Operating Temperature Ranges:
MAX72_C_ ............................ OT) to +70''C
MAX72_ESE ........................... -40°C to +850
Junction Temperature ........................... +150'C
Storage Temperature Range ......... , , _ ' -65°C to +160''C
Lead Temperature (soldering, 10 sec) .............. +300°C
Stresses beyond those listed under "Absolute Maximum Ratings' may cauge 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 /n the operational sections of the specifications is not Implied Exposure to
absolute maximum ratmg donations for extended periods may affect device reliabmty.
ELECTRICAL CHARACTERISTICS
(CircuitofFigure1,VBATT1 = VBATT2 = 2.5V. ILOAD = OmA. TA = TMIN to TMAX, unless otherwise noted )
MAX 722/MAX 723
PARAMETER CONDITIONS MIN TYP MAX UNITS
2V < VBATT1 < 3V, 3/3 3V MAX722 3.17 3.3 343
Main Output Voltage - OmA < ILOAD < 200mA. =
Main SMPS Mode DC SOURCE = ov _ MAX723 2.88 ao 3.12 V
(Note 1) 3/5 = ov 48 5.0 5.2
3/3 3V MAX722 3.17 3.3 343
Main Output Voltage - N < DC SOURCE < 18V, =
Linear-RegulatorMode OmA < ILOAD < 500mA - MAX723 2B8 (3,0 3.12 V
3/5 = 0V 4.8 5.0 5.2
2V < VBATT2 < 5V, VBATT1 = 2.5V,
Auxiliary Output Voltage External Reference = 3V, R4 = 170k. -18 -17 -16 V
R5 = 30k, OmA < ILOAD < 5mA
FBN Input Offset Voltage 3/5 = ov or 3V t2 t20 mV
FBN Input Bias Current FBN forced to 0V -5 +_100 nA
Minimum Start-Up Supply _
Voltage (VBATT1) LOAD - omA (185 V
Minimum Start-Up Supply
Voltage (DCSOURCE) 7.3 7.6 V
Current-Sense Limit Threshold Measured at CS+, cs, 170 200 230 mV
DHI Source Current 3/5 = av 50 mA
DLOW On Resistance 3/5 = 3V 5 Q
_ = . - = 3V,
gy'esc‘fgt feugf'y Current from $5582.33! CETN (MAX722) 60 “A
OUT C) FB3 forced to 3.15v (MAX723)
Battery Quiescent Current - - -
(VBATT1 + VBATT2) NEGON - OV, 3/5 - 3V 60 pA
Shutdown Battery Current NEGON = ov, 3/3 = 3V, SHDN = ov 20 40 WA
Battery Quiescent Current - - - -
Linear-Regulator Mode DC SOURCE - TV, 3/5 - OV, measured at VBATT1 -10 10 PA
Linear-RegulalorOutput - - _
Sink Current LIN - 6V, 3/5 - 3V, measured at LIN 20 50 mA
Reference Voltage No VREF load 1.23 1.25 1.27 V
3/g 3V TA = +2S'C 1O 20
Reference Load Regulation -20}.1_A < 'REF load < 250PA TA = TMIN to 25 mV
2 IVI I] A I IVI
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