MAX1822ESA+ Maxim Integrated Products, MAX1822ESA+ Datasheet - Page 6

• Manufacturer Part Number: MAX1822ESA+
• Description: IC POWER SUPPLY HI SIDE 8-SOIC
• Manufacturer: Maxim Integrated Products
• Type: Switched Capacitor (Charge Pump)r

Specifications of MAX1822ESA+

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 14.5 ~ 27.5 V
• Current - Output: 25mA
• Frequency - Switching: 90kHz
• Voltage - Input: 3.5 ~ 16.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Power - Output: 471mW
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Maximum Power Dissipation: 471 mW
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

High-Side Power Supply
6
Figure 3. Single MAX1822 Driving Six High-Side Switches
Figure 2. MAX1822 Quiescent Supply-Current Test Circuit
_______________________________________________________________________________________
V
SUPPLY
NOTE 1: 1µF CAPACITORS SUPPRESS SWITCHING TRANSIENTS, SIZE DEPENDS ON LOAD CURRENTS.
NOTE 2: POWER TRANSISTOR TYPE DEPENDS ON LOAD-CURRENT REQUIREMENTS.
LOW ESR
1000µF
A
C4
0.047µF
0.047µF
+5V
C2
C2
V
0.047µF
0.047µF
1
7
6
2
SW1
SW2
SW3
SW4
SW5
SW6
C1+
C1-
C2+
C2-
C2
C2
MAX1822
GND
V
1
7
6
2
CC
8
4
C1+
C1-
C2+
C2-
V
OUT
MAX1822
GND
V
5
CC
8
4
1.0µF
V
1µF
6-CHANNEL LOAD SWITCH
C4
C3
OUT
10
12
2
4
6
8
5
10µF
C3
74C906
14
7
1
3
5
9
11
13
ALL PULLUP RESISTORS = 1M
V
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 (V
must not exceed 13V) and C3 is 10µF, output ripple
typically falls to 15mV (Typical Operating Character-
istics).
Capacitor type is unimportant when selecting capaci-
tors for the MAX1822. However, when V
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
OUT
ripple is typically 50mVp-p with V
ALL TRANSISTORS = 1RF541 (NOTE 2)
ALL CAPACITORS = 1µF
Capacitor Selection
(NOTE 1)
TO 1A LOAD
TO 1A LOAD
TO 1A LOAD
TO 1A LOAD
TO 1A LOAD
TO 1A LOAD
Output Ripple
CC
CC
= +5V, C1
exceeds
CC