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MAX1822ESA-T
High-Side Power Supply
_______________General Description
The MAX1822 high-side supply, using a regulated
charge pump, generates a regulated output voltage
11V greater than the input supply voltage to power
high-side switching and control circuits. The MAX1822
allows low-resistance N-channel MOSFETs (FETs) to be
used in circuits that normally require costly, less effi-
cient P-channel FETs and PNP transistors. The high-
side output also eliminates the need for logic FETs in
+5V and other low-voltage switching circuits.
A +3.5V to +16.5V input supply range and a typical qui-
escent current of only 150µA make the MAX1822 ideal
for a wide range of line- and battery-powered switching
and control applications where efficiency is crucial.
Also provided is a logic-level power-ready output (PR)
to indicate when the high-side voltage reaches the
proper level.
The MAX1822 comes in an 8-pin SO package and
requires three inexpensive external capacitors. The
MAX1822 is a pin-for-pin replacement to the MAX622.
________________________Applications
High-Side Power Control with N-Channel FETs
Low-Dropout Voltage Regulators
Power Switching from Low Supply Voltages
H-Switches
Stepper Motor Drivers
Battery-Load Management
Portable Computers
____________________________Features+3.5V to +16.5V Operating Supply Voltage RangeOutput Voltage Regulated to VCC+ 11V (typ)150µA (typ) Quiescent CurrentPower-Ready Output
MAX1822
High-Side Power Supply
C2+
VOUTGND
VCC
C1-C2-
C1+
TOP VIEW
MAX1822
Pin Configuration
MAX1822
+3.5V TO +16.5V
0.1μF
CERAMIC
GND
+12.5V TO +27.5VPR
VOUT
VCCC1
C1+
C1-
C2+
C2-C2
Typical Operating Circuit
19-1892; Rev 0; 1/01
PART
MAX1822ESA-40°C to +85°C
TEMP. RANGEPIN-PACKAGE
8 SO
Ordering Information
MAX1822
High-Side Power Supply
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VCC= +5V, TA= TMINto TMAX, unless otherwise noted.)
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.
Note 1:High-side voltage measured with respect to ground.
Note 2:For VCC> +13V on the MAX1822, use C1 = C2 = 0.01µF.
Note 3:Power-Ready Threshold is the voltage with respect to ground at VOUTwhen PR switches high (PR = VCC).
VCC......................................................................................+17V
VOUT....................................................................................+30V
IOUT...................……………………………………………….25mA
Continuous Total Power Dissipation (TA= +70°C)
8-pin SO (derate 5.88mW/°C above +70°C)...............471mW
Operating Temperature Range...........................-40°C to +85°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10s).................................+300°CPARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITSSupply Voltage VCC 3.5 16.5 VIOUT = 0, VCC = 3.5V, C1 = C2 = 0.047µF, C3 = 1µF 11.5 12.5 16.5IOUT = 0, VCC = 4.5V, C1 = C2 = 0.047µF,
C3 = 1µF 14.5 15.5 17.5IOUT = 0, VCC = 16.5V, C1 = C2 = 0.01µF,
C3 = 1µF (Note 2) 26.5 27.5 29.5IOUT = 50µA, VCC = 3.5V, C1 = C2 = 0.047µF, C3 = 1µF 8.5 10.5 16.5IOUT = 250µA, VCC = 5V, C1 = C2 = 0.047µF, C3 = 1µF 15 18High-Side Voltage (Note 1) VOUTIOUT = 500µA, VCC = 16.5V, C1 = C2 = 0.01µF, C3 = 1µF (Note 2) 26.5 29.5VPower-Ready Threshold PRT IOUT = 0 (Note 3) 12 13.5 14.5 VPower-Ready Output High PROH ISOURCE = 100µA 3.8 4.3 5 VPower-Ready Output Low PROL ISINK = 1mA 0.4 VOutput Voltage Ripple VR C1 = C2 = 0.01µF, C3 = 10µF, IOUT = 1mA, VCC = 16.5V 50 mVSwitching Frequency FO 90 kHzIOUT = 0, VCC = 5V, C1 = C2 = 0.047µF,
C3 = 1µF, TA = +25°C 150 500Quiescent Supply Current IQ IOUT = 0, VCC = 16.5V, C1 = C2 = 0.047µF,
C3 = 1µF, TA = +25°C 150 350µA
MAX1822
High-Side Power Supply
MAX1822
SUPPLY CURRENT
vs. C3 CAPACITOR VALUE
MAX1822 toc01
C3 CAPACITOR VALUE (μF)
SUPPLY CURRENT (
VCC = +5V, IOUT = 0
TA = +25°C
C1 = C2 = C*
C* = 0.01μF
C* = 0.1μF
C* = 0.033μF
C* = 0.047μF
C* =
0.022μF
MAX1822 toc02
C3 CAPACITOR VALUE (μF)
SUPPLY CURRENT (
MAX1822
SUPPLY CURRENT
vs. C3 CAPACITOR VALUE
VCC = +16.5V
IOUT = 0
TA = +25°C
C1 = C2 = 0.01μF
MAX1822 toc03
VCC (V)
SUPPLY CURRENT (mA)
MAX1822
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
C1 = C2 = 0.01μF
IOUT = 0
C3 = 1μF
TA = +25°C
C1 = C2 = 0.47μF0.81.00.40.60.21.21.41.61.82.0
MAX1822 toc05
IOUT (mA)
OUT
(V)
MAX1822
OUTPUT VOLTAGE
vs. OUTPUT CURRENT
C1 = C2 = 0.01μF
VCC = +5V
C3 = 10μF
TA = +25°C
C1 = C2 = 0.22μF
C1 = C2 = 0.47μF
MAX1822 toc04
C1 = C2 CAPACITANCE VALUE (μF)
MAXIMUM I
OUT
MAX1822
MAXIMUM OUTPUT CURRENT
vs. C1 = C2 CAPACITOR VALUE
VCC = +5V
C3 = 10μF
TA = +25°C
NOTE: MAXIMUM IOUT IS THE LOAD
CURRENT AT THE POINT
WHERE VOUT BEGINS TO
LOSE REGULATION.3125678910
MAX1822 toc05
IOUT (mA)
OUT
(V)
MAX1822
OUTPUT VOLTAGE
vs. OUTPUT CURRENT
C1 = C2
0.047μF
C1 = C2
0.022μF
C1 = C2
0.01μF
VCC = +12V
C3 = 10μF
TA = +25°C
__________________________________________Typical Operating Characteristics
MAX1822
High-Side Power Supply
Pin Description
MAX1822 toc07
RESERVOIR CAPACITOR (μF)
OUT
RIPPLE (mV)
MAX1822
OUTPUT VOLTAGE RIPPLE
vs. RESERVOIR CAPACITOR C3
TA = +25°C
VCC = +5V
IOUT = 500μA
C1 = C2 = 0.047μF
VCC = +16.5V
IOUT = 1mA
C1 = C2 = 0.01μF5101520
MAX1822 toc08
VCC (V)
TURN-ON TIME (ms)
MAX1822
TURN-ON TIME
vs. SUPPLY VOLTAGE
IOUT = 0
TA = +25°C
Typical Operating Characteristics (continued)
PINNAMEFUNCTIONC1+Positive terminal to primary charge-pump capacitorC2-Negative terminal to secondary charge-pump capacitorPRPower-Ready Output. High when VOUT is ≥ VCC + 8.5V with respect to GND.GNDGround
5VOUTHigh-Side Voltage OutC2+Positive terminal to secondary charge-pump capacitorC1-Negative terminal to primary charge-pump capacitor
8VCCInput Supply
MAX1822
High-Side Power Supply
Detailed Description
Charge-Pump Operation
The MAX1822 is a multistage charge-pump power sup-
ply. Although the charge pump is capable of multiply-
ing VCCup to four times, the output is regulated to VCC
+ 11V by an internal feedback circuit for inputs above
4V. The charge pump typically operates at 90kHz, but
regulates by pulse skipping. When VOUTexceeds VCC
+ 11V, the oscillator shuts off. As VOUTdips below VCC
+ 11V, the oscillator turns on.
Power-Ready Output
The Power-Ready Output (PR) signals control circuitry
when the high-side voltage reaches a preset level. This
feature can be used to protect external FET switches
from excess dissipation and damage by preventing them
from turning on, except when adequate gate drive levels
are present. When power is applied, PR remains low until
VOUTreaches approximately VCC+ 8.5V. PR also goes
low if VOUTfalls below this level during operation, i.e., if
the output is overloaded. The PR high level is VCC.
Applications Information
Quiescent Supply Current
MAX1822 quiescent supply current varies with VCCand
with the values of C1, C2, and C3 (Typical Operating
Characteristics). Even with no external load, the device
must still pump to overcome internal losses. Large ratios
between C3 and C1 or C2 require more charge-pump
cycles to restore VOUT. As VCCfalls below 5V, quiescent
current rises fairly rapidly to about 1mA at 4V (Typical
Operating Characteristics). This rise occurs because
VOUTno longer pulse skips to regulate at low input volt-
ages; the oscillator runs continuously, so supply current
is higher. Figure 2shows the test circuit for the
MAX1822 quiescent supply current.
Figure 1. MAX1822 Block DiagramS2
TWO-STAGE CHARGE PUMP
(SWITCHES SHOWN IN REFRESH MODE)
RC OSCILLATOR+
CONTROL LOGIC
OVERVOLTAGE
COMPARATOR
POWER-READY
COMPARATOR
PR DRIVER
GND
VCC
11V8.5V
VOUT
VINT
MAX1822
Output Ripple
VOUTripple is typically 50mVp-p with VCC= +5V, C1
and C2 = 0.047µF, and C3 = 1µF (Typical Operating
Characteristics). Ripple can be reduced by increasing
the ratio between the output storage capacitors C3 and
C1 and C2. This is usually accomplished by increasing
C3 and keeping C1 and C2 in the 0.01µF to 0.047µF
range. For example, if C1 and C2 are 0.047µF (VCC
must not exceed 13V) and C3 is 10µF, output ripple
typically falls to 15mV (TypicalOperatingCharacter-
istics).
Capacitor Selection
Capacitor type is unimportant when selecting capaci-
tors for the MAX1822. However, when VCCexceeds
13V, C1 and C2 must be no greater than 0.01µF. Using
larger value capacitors with input voltages above 13V
causes excessive amounts of energy to pass through
High-Side Power Supply
Figure 2. MAX1822 Quiescent Supply-Current Test Circuit
MAX18221000μF
LOW ESR
GND1.0μFVOUTVCC0.047μF
C1+
VSUPPLY
C1-
C2+
C2-
0.047μF
Figure 3. Single MAX1822 Driving Six High-Side Switches
MAX1822
SW1
SW2
SW3
SW4
SW5
SW6
GND
ALL PULLUP RESISTORS = 1M
74C906
ALL TRANSISTORS = 1RF541 (NOTE 2)
1μF
10μFVOUTVCC
0.047μF
C1+
+5V
C1-
C2+
C2-
0.047μF
ALL CAPACITORS = 1μF
(NOTE 1)
NOTE 1:1μF CAPACITORS SUPPRESS SWITCHING TRANSIENTS, SIZE DEPENDS ON LOAD CURRENTS.
NOTE 2:POWER TRANSISTOR TYPE DEPENDS ON LOAD-CURRENT REQUIREMENTS.
TO 1A LOAD
TO 1A LOAD
TO 1A LOAD
TO 1A LOAD
TO 1A LOAD
TO 1A LOAD
6-CHANNEL LOAD SWITCH

Partno	Mfg	Dc	Qty	Available	Descript
MAX1822ESA-T \|MAX1822ESAT	MAXIM	N/a	4831	avai	High-Side Power Supply