PCA9620H/Q900/1,51 NXP Semiconductors, PCA9620H/Q900/1,51 Datasheet - Page 34

• Manufacturer Part Number: PCA9620H/Q900/1,51
• Description: LCD Drivers 480 SEGMENT LCD SEGMENT DRIVER
• Manufacturer: NXP Semiconductors

Specifications of PCA9620H/Q900/1,51

• Number Of Segments: 60
• Maximum Clock Frequency: 14500 Hz
• Operating Supply Voltage: 2.5 V to 5.5 V
• Maximum Power Dissipation: 400 mW
• Maximum Operating Temperature: + 105 C
• Package / Case: LQFP-80
• Maximum Supply Current: 200 uA
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 935291899518

NXP Semiconductors
PCA9620
Product data sheet
The ratio between these two numbers determines the charge pump power efficiency:
Loading the charge pump with higher currents decreases the output voltage. This
decrease is determined by the charge pump driving capability, respectively by the output
resistance of the charge pump (see
The power efficiency calculation is only valid when the charge pump is running at its
maximum peak frequency and regulates the generated V
this case, the ripple on the V
Approximately, this could also be calculated with the parameter of the output resistance of
the charge pump (see
be provided by using
load current needed for the application.
If the application runs with V
(DC measured), and the V
power efficiency - it would be the best to have a charge pump frequency set to half
frequency.
P
η
Fig 26. Power efficiency of the charge pump
i
p
=
=
I
(1) η
(2) η
(3) V
(4) V
P
DD2
(%)
o
η
p
⁄
90
70
50
30
Charge pump set to 2 × V
P
×
p
p
LCD
LCD
i
, full charge pump frequency.
, half charge pump frequency.
0
V
, full frequency.
, half frequency.
DD2
All information provided in this document is subject to legal disclaimers.
Equation 7 on page
Rev. 1 — 9 December 2010
Table 35 on page
200
LCD
(1)
(2)
DD2
LCD
DD2
generated voltages are up to 5.0 V, then - concerning
= 3.0 V, the load currents are up to 400 μA
voltage equals the internal charge pump frequency.
; V
DD2
Table 35 on page
400
= 3 V.
55), the load current, and the voltage needed to
33. This value of I
Universal LCD driver for low multiplex rates
(3)
(4)
600
55).
LCD
load
voltage with full speed. In
800
is close to the value of the
I
load
PCA9620
001aan027
© NXP B.V. 2010. All rights reserved.
(μA)
1000
7
5
3
1
V
(V)
LCD
34 of 71
(10)
(9)