MAX1620EEE+ Maxim Integrated Products, MAX1620EEE+ Datasheet - Page 19

• Manufacturer Part Number: MAX1620EEE+
• Description: IC LCD BIAS SUPP DGTL ADJ 16QSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX1620EEE+

• Applications: LCD Display
• Current - Supply: 150µA
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-QSOP
• Output Current: 0.07 A
• Input Voltage: 1.8 V to 20 V
• Switching Frequency: 300 KHz
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

TRANSISTOR COUNT: 341
SUBSTRATE CONNECTED TO AGND
Figure 10. Positive Output with Bipolar Switching Transistor
___________________________________________________Simplified Block Diagram
___________________Chip Information
5.5V
12V
2V
TO
TO
3V
NOTE: CONNECTIONS TO DIGITAL INPUTS NOT SHOWN.
SHDN (SUS)
R1
360k
R2
100k
C1
0.1 F
C2
0.1 F
DN (SDA)
UP (SCL)
AGND
BATT
POK
POL
V
REF
DD
FB
______________________________________________________________________________________
R8
10k
D3 1N6263 (ANY SCHOTTKY)
11
12
3
5
7
4
1
2
6
Digitally Adjustable LCD Bias Supplies
BATT
POK
V
POL
SHDN (SUS)
DN (SDA)
UP (SCL)
REF
AGND
DD
( ) ARE FOR MAX1621.
TO REF
SHDN
MAX1620
MAX1621
U1
INTERFACE
DIGITAL
BIAS
LCDON
PGND
DOUT
DLO
DHI
LX
FB
1.5V
14
16
15
13
10
9
8
1.0V
C3
10 F
470
RS
300k
R3
REFERENCE
BANDGAP
CONTROL
ON-TIME
5-BIT
DAC
R4
300k
Q1
MMBT4401LT1
MBRS0540+
L1
220 H
D1
MAX1620
MAX1621
100pF
2.2M
C6
R5
C5
10 F
( ) ARE FOR MAX1621 ONLY.
R6
150k
R7
150k
LCDON
DOUT
LX
DHI
DLO
PGND
Q1
MMBT2907
OPTIONAL
12.5V
TO
23.5V OUT
VOUTSW
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