19-2063; Rev 0; 6/01
MAX1778 Evaluation Kit
General Description
Features
The MAX1778 evaluation kit (EV kit) is a fully assembled
and tested surface-mount circuit board that contains a
step-up switching regulator, two charge-pump voltage-
o +2.7V to +5.5V Input Range
o Output Voltages
+8V, >200mA (Step-Up Switching Regulator)
+20V, >10mA (Positive Charge-Pump Regulator)
-5V, >20mA (Negative Charge-Pump Regulator)
+2.5V, >200mA (LDO Linear Regulator)
regulator circuits, a V
buffer, and a low-drop out
COM
linear regulator (LDO). The step-up switching circuit is
configured for a +8V output that provides up to 250mA
of current from a +3.0V supply. The EV kit can be pow-
ered from a +2.7V to +5.5V supply.
+4V, >150mA Peak (V
Buffer)
COM
The positive charge-pump circuit is configured for a
+20V output that provides more than 10mA of current.
The negative charge-pump circuit is configured for a
-5V output and provides more than 20mA of current.
Power for both charge-pump inputs is provided from
the step-up switching regulator output.
o All Outputs Are Adjustable with Resistors
o >91% Efficiency
o Internal MOSFET Switches
o <1µA (typ) IC Shutdown Current
o 1MHz Step-Up Switching Regulator Frequency
The EV kit also features an LDO linear regulator circuit,
which is configured for a +2.5V output that provides
more than 200mA of current. Power for the LDO regula-
o 500kHz Charge-Pump Regulator Switching
Frequency
o Adjustable Fault-Trip Level
tor circuit is provided from the input supply. The V
COM
buffer provides a +4V output and more than 150mA of
peak current. The step-up switching regulator output
o Low-Profile External Components
o Built-In Transient Load Tester
o Surface-Mount Components
o Fully Assembled and Tested
provides power to the V
buffer.
COM
The MAX1778 EV kit demonstrates low quiescent cur-
rent and high efficiency (over 91%). High-frequency
operation (500kHz/1MHz) allows the use of tiny surface-
mount components and fast transient response. The
MAX1778 TSSOP package (1.1mm max) with low-pro-
file external components allows this circuit to be less
than 1.2mm in height. A built-in transient load tester
facilitates transient load tests. The MAX1778 EV kit can
also be used to evaluate the MAX1880, MAX1881, and
MAX1882 ICs.
Ordering Information
PART
TEMP. RANGE
IC PACKAGE
MAX1778EVKIT
0 C to +70 C
24 TSSOP
Component List
DESIGNATION
QTY
DESCRIPTION
DESIGNATION
QTY
DESCRIPTION
1µF 10%, 16V X7R ceramic
capacitors (1206)
Murata GRM42-6X7R105K016
3.3µF 10%, 10V X7R ceramic
capacitors (1210)
Taiyo Yuden LMK325BJ335KD
C5, C7, C11,
C13, C25 C29
C1, C16, C17,
C18, C21
9
5
1000pF 10%, 50V X7R
ceramic capacitor (0603)
Murata GRM39X7R102K050AD
0.47µF 10%, 10V X7R ceramic
capacitor (0603)
Taiyo Yuden LMK107BJ474KA
C8
1
C2
1
2
4
0.22µF 10%, 10V X7R ceramic
capacitor (0603)
Taiyo Yuden LMK107BJ224KA
0.01µF 10%, 50V X7R ceramic
capacitors (0603)
Murata GRM39X7R103K050AD
C9
1
0
C3, C14
0.1µF 20%, 16V X7R ceramic
capacitors (0603)
C12, C20, C24
Not installed (0603)
C4, C6, C10, C22
Taiyo Yuden EMK107BJ104MA
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.