Under
Development
Features
Boot Strap System Chopper Regulator
Outline Dimensions
5.2
8
7
6
5
1
2
3
4
5
6
7
8
V
IN
V
B
NC
ON/OFF
V
adj
COM
COM
V
O
[PQ1CX12H2ZP]
4.4
Expansion of Chopper Regulator
System
Model No.
Efficiency
SW current(MAX)
Input voltage
Package
Outline dimension
General purpose type
Boot strap system
PQ1CY1032ZP/ZZ
PQ1CX12H2ZP
TYP 82% (12V
→
5V,2A)
TYP 87% (12V
→
5V,2A)
TYP 75% (5V
→
3.3V,2A)
TYP 85% (5V
→
3.3V,2A)
3.5 A
2.5 A
High efficiency
4.5 to 40 V
Compact package
4.5 to 20 V
TO-263type 5 -pin
SOP8 -pin
10.6
×
13.7
×
3.5 mm
5.2
×
6.2
×
1.5 mm
1
2
3
4
1.5
Unit:mm
S mark
1.25
Line-up of Chopper Regulator
Step down output
/ Reverse output
Package SW current
TO-220
0.8A
1.5A
Oscillation frequency
300kHz
PQ1CG38M2FZ/RZ
100kHz
300kHz
3.5A
TO-263
SC-63
3.5A
0.8A
1.5A
SOP8 -pin
2.5A
70kHz
150kHz
150kHz
300kHz
100kHz
300kHz
150kHz
PQ1CG21H2FZ/RZ
PQ1CG41H2FZ/RZ
PQ1CG2032FZ/RZ
PQ1CG3032FZ/RZ
PQ1CY1032ZP/ZZ
PQ1CZ38M2ZP/ZZ
PQ1CZ21H2ZP/ZZ
PQ1CZ41H2ZP/ZZ
PQ1CX12H2ZP
PQ1CX12H2ZP
Specifications
Parameter
Input voltage
Output saturation voltage
Switching current
Output OFF -state dissipation current
Stand -by current
Reference voltage
Oscillation frequency
Efficiency
Operating temperature
Symbol Characteristics
V
IN
V
SAT
I
SW
I
QS
I
SD
V
ref
f
OSC
η
T
opr
MAX 20 V
TYP 0.3 V
MAX 2.5 A
MAX 7 mA
V
IN
=20 V
MAX 400
µ
A V
IN
=20 V
TYP 1.26 V
TYP 150 kHz
TYP 87%
V
IN
=12V,V
O
=5V,I
O
=2A
-30 to +85
°
C
I
SW
=2.0 A
Conditions
■
Block Diagram
V
IN
V
B
Drive
Circuit
Voltage
regulator
ON/OFF
circuit
Comparator
Over
current
detection
circuit
Over
Heat
Detection
circuit
COM
+
-
Q
F/F
R
S
ON/OFF
Soft
Start
-
+
AMP
V
ref
Oadj
Vo
■
Feature of Bootstrap Method Chopper Regulator
Bootstrap capacitor is installed to supply higher controlled vol tage than input voltage to
switching transistor inside.
The higher efficiency is obtained due to the switching transisto r’s saturated voltage become
low by higher controlled voltage than supplied input voltage
Conventional (general purpose)
Supply from same voltage
as input voltage
½Reduction
of
switching loss
½High
efficiency
To supply from higher voltage than
input voltage Charged to bootstrap capacitor
Oscill
ator
V
IN
driver
V
CE
V
IN
V
BE
V
O
Output salutation voltage:
Large : over 1V
C
6.2
Bootstrap method
driver
•
High efficiency:TYP 87 %
(Compare to conventional model:5 % up)
•
Low dissipation current :I
QS
=MAX 7mA
(Compare to conventional model:56% down)
•
Compact package:SOP8 -pin(Outline dimension:5.2
×
6.2
×
1.5 mm)
Compare to SC -63 package (Mounting area):49 % down
Compare to TO -263 package (Mounting area):77 % down
fo Conversion
circuit
V
CE
■
Application Circuit
Boot strap
V
B
condenser
Vo
R2
Oadj
COM
D
GND
R1
GND
C
O
Vo=3.3V
Io=2A
L
V
OUT
Driver power supply and output transistor
current are supplied from the same power
supply.
Output salutation voltage:
Large (VBE +VCE = over 1V)
V
O
Output saturation voltage Low : 0.3Ｖ
Driver power and output transistor current is
supplied from the separate power supply
Output saturation voltage small
(V
CE
=0.3)
V
IN
=5V
V
IN
V
C
(ON/OFF)
C
IN
Chopper
regulator
・High
Efficiency 82% against conventional model
---> The method 87%(at V =12V- Vo=5V)
IN
Drastic improvement of efficiencyesp in dropper application below 5V
・Efficiency
improvement at low input
Conventional efficiency 75% 85% (V
IN
=5V
-
VO =3.3V)
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