MAX619ESA+ Maxim Integrated Products, MAX619ESA+ Datasheet - Page 6

• Manufacturer Part Number: MAX619ESA+
• Description: IC DC/DC CONV CHRG PUMP 5V 8SOIC
• Manufacturer: Maxim Integrated Products
• Type: Switched Capacitor (Charge Pump)r

Specifications of MAX619ESA+

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 5V
• Current - Output: 50mA
• Frequency - Switching: 500kHz
• Voltage - Input: 2 ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Power - Output: 471mW
• Function: Step Up
• Output Voltage: 5 V
• Output Current: 50 mA
• Supply Current: 75 uA
• Maximum Operating Temperature: + 85 C
• Input Voltage: 2 V to 3.6 V
• Maximum Power Dissipation: 471 mW
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Switching Frequency: 500 KHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Regulated 5V Charge-Pump
DC-DC Converter
Table 1. Capacitor Suppliers
6
__________Applications Information
The values of charge-pump capacitors C1 and C2 are
critical to ensure adequate output current and avoid
excessive peak currents. Use values in the range of
0.22 F to 1.0 F. Larger capacitors (up to 50 F) can
be used, but larger capacitors will increase output rip-
ple. Ceramic or tantalum capacitors are recommend-
ed.
The type of input bypass capacitor (C3) and output fil-
ter capacitor (C4) used is not critical, but it does affect
performance. Tantalums, ceramics, or aluminum elec-
trolytics are suggested. For smallest size, use Sprague
595D106X0010A2 surface-mount capacitors, which
measure 3.7mm x 1.8mm (0.146in x 0.072in). For low-
est ripple, use large, low effective-series-resistance
(ESR) ceramic or tantalum capacitors. For lowest cost,
use aluminum electrolytic or tantalum capacitors.
Figure 2 shows the component values for proper oper-
ation using minimal board space. The input bypass
capacitor (C3) and output filter capacitor (C4) should
both be at least 10 F when using aluminum electrolyt-
ics or Sprague’s miniature 595D series of tantalum chip
capacitors.
* Note: (SM) denotes surface-mount component, (TH) denotes through-hole component.
Murata Erie
Sprague Electric
(smallest size)
________________________________________________________________________________________
SUPPLIER
Input and Output Capacitors, C3 and C4
Charge-Pump Capacitors C1 and C2
PHONE NUMBER
[phone]
[phone]
[phone]
Capacitor Selection
[phone]
[phone]
[phone]
FAX NUMBER
When using ceramic capacitors, the values of C3 and
C4 can be reduced to 2 F and 1 F, respectively. If the
input supply source impedance is very low, C3 may not
be necessary.
Many capacitors exhibit 40% to 50% variation over
temperature. Compensate for capacitor temperature
coefficient by selecting a larger nominal value to
ensure proper operation over temperature. Table 1 lists
capacitor suppliers.
Figure 2. Two-Cell to 5V Application Circuit
2
CELLS
RPE121Z5U104M50V
GRM42-6Z5U22M50
RPI123Z5U105M50V
GRM42-6Z5U10M50
C3
10µF
595D106X0010A2
0.22µF
CAPACITOR
C2
2
6
1
8
IN
GND
C1+
C1–
MAX619
SHDN
OUT
C2–
C2+
CAPACITOR TYPE*
0.22 F ceramic (SM)
0.1 F ceramic (SM)
10 F tantalum (SM)
1.0 F ceramic (TH)
0.1 F ceramic (TH)
3
7
4
5
C4
10µF
C1
0.22µF
5V ±4%
@ 20mA