NEC UPC1934GR-PJG, UPC1934GR-1JG Datasheet
DATA SHEET
BiCMOS INTEGRATED CIRCUIT
µ
µ
PC1934
µ µ
DC-DC CONVERTER CONTROL IC
DESCRIPTION
The µ PC1934 is an IC that controls a low-voltage input DC-DC conver ter. This IC is suitable for an operation with 3-V,
3.3-V input or a lithium ion secondary battery input, because the minimum operation supply voltage is 2.5 V. Because of
its wide operating voltage range, it can also be used to control DC-DC converters that use an AC adapter for input.
FEATURES
Low supply voltage: 2.5 V (MIN.)
•
Operating voltage range: 2.5 to 20 V (breakdown voltage: 30 V)
•
Timer latch circuit for short-circuit protection.
•
Ceramic capacitor with low capacitance (0.1
•
Open drain outputs (Each of the outputs can be used to control a step-down converter, a step-up converter and an
•
inverted converter.)
Can control two output channels.
•
ORDERING INFORMATION
Part Number Package
PC1934GR-1JG 16-pin plastic SSOP (5.72 mm (225))
µ
PC1934GR-PJG 16-pin plastic TSSOP (5.72 mm (225))
µ
F) can be used for short-circuit protection.
µ
The information in this document is subject to change without notice. Before using this document, please
confirm that this is the latest version.
Not all devices/types available in every country. Please check with local NEC representative for
availability and additional information.
Document No. G13567EJ3V0DS00 (3rd edition)
Date Published April 2000 NS CP (K)
Printed in Japan
The mark ★ shows major revised points.
1998
BLOCK DIAGRAM
µ
µ
PC1934
µ µ
Channel 2
DTC
V
REF
16
DLY
15
I
N2
I
I2
14 13 12 11 10
FB
2
2
OUT
2
V
CC
9
MOS output
Reference
voltage
section
Timer latch for
short-circuit
protection section
–
+
E/A
2
–
–
+
PWM
2
MOS input
MOS input
Oscillation
section
MOS output
+
–
E/A
1
+
–
–
PWM
1
12 34 56 78
FB
R
T
C
T
I
I
N1
I1
1
DTC
1
1
Channel 1
GNDOUT
2
Data Sheet G13567EJ3V0DS00
PIN CONFIGURATION (Top View)
16-pin plastic SSOP (5.72 mm (225))
••••
µµµµ
PC1934GR-1JG
16-pin plastic TSSOP (5.72 mm (225))
••••
µµµµ
PC1934GR-PJG
µ
µ
PC1934
µ µ
FB
DTC
OUT
GND
C
T
R
T
I
N1
I
I1
1
1
1
1
2
3
4
512
611
710
89
16
15
14
13
V
REF
DLY
I
N2
I
I2
FB
DTC
OUT
V
CC
2
2
2
PIN FUNCTIONS
Pin No. Symbol Function Pin No. Symbol Function
1CTFrequency setting capacitor connection 9 V
2RTFrequency setting resistor connection 10 OUT
3IN1Channel 1 error amplifier non-inverted
11 DTC
input
4II1Channel 1 error amplifier inverted input 12 FB
5FB1Channel 1 error amplifier output 13 I
6DTC1Channel 1 dead time setting 14 I
7OUT1Channel 1 open drain output 15 DLY Delay capacitor connection of short-
8 GND Ground 16 V
CC
I2
N2
Power supply
2
Channel 2 open drain output
2
Channel 2 dead time setting
2
Channel 2 error amplifier output
Channel 2 error amplifier inverted input
Channel 2 error amplifier non-inverted
input
circuit protection
REF
Reference voltage output
Data Sheet G13567EJ3V0DS00
3
µ
µ
PC1934
µ µ
CONTENTS
1. ELECTRICAL SPECIFICATIONS................................................................................................................5
2. CONFIGURATION AND OPERATION OF EACH BLOCK....................................................................10
2.1 Reference V oltage Generator ...........................................................................................................................10
2.2 Oscillator ...........................................................................................................................................................10
2.3 Under Voltage Lock-out Circuit........................................................................................................................11
2.4 Error Amplifiers.................................................................................................................................................11
2.5 PWM Comparators............................................................................................................................................11
2.6 Timer Latch-Method Short Circuit Protection Circuit....................................................................................11
2.7 Output Circuit....................................................................................................................................................11
3. NOTES ON USE........................................................................................................................................12
3.1 Setting the Output Voltage ...............................................................................................................................12
3.2 Setting the Oscillation Frequency...................................................................................................................13
3.3 Preventing Malfunction of the Timer Latch-Method Short Circuit Protection Circuit..................................13
3.4 Connecting Unused Error Amplifiers ..............................................................................................................13
3.5 ON/OFF Control.................................................................................................................................................14
3.6 Notes on Actual Pattern Wiring........................................................................................................................14
4. APPLICATION EXAMPLE ......................................................................................................................... 15
4.1 Application Example.........................................................................................................................................15
4.2 List of External Parts........................................................................................................................................15
5. PACKAGE DRAWINGS..............................................................................................................................16
6. RECOMMENDED SOLDERING CONDITIONS .......................................................................................18
4
Data Sheet G13567EJ3V0DS00
1. ELECTRICAL SPECIFICATIONS
Absolute Maximum Ratings (unless otherwise specified, TA
====
25
µ
µ
PC1934
µ µ
°°°°
C)
Parameter Symbol
Supply voltage V
Output voltage V
Output current (open drain output) I
Total power dissipation P
Operating ambient temperature T
Storage temperature T
µ
PC1934GR-1JG
CC
O
O
T
A
stg
417 400 mW
–20 to + 85
–55 to + 150
µ
PC1934GR-PJG Unit
30 V
30 V
21 mA
°
°
C
C
Caution Product quality may suffer if the absolute maximum rating is exceeded even momentarily for any
parameter. That is, the absolute maximum ratings are rated values at which the product is on the verge
of suffering physical damage, and therefore the product must be used under conditions that ensure
that the absolute maximum ratings are not exceeded.
Recommended Operating Conditions
Parameter Symbol MIN. TYP. MAX. Unit
O
OSC
CC
O
A
2.5 20 V
020V
20 mA
−
20
20 1000 kHz
+
85
°
C
Supply voltage V
Output voltage V
Output current I
Operating temperature T
Oscillation frequency f
Caution The recommended operating range may be exceeded without causing any problems provided that the
absolute maximum ratings are not exceeded. However, if the device is operated in a way that exceeds
the recommended operating conditions, the margin between the actual conditions of use and the
absolute maximum ratings is small, and therefore thorough evaluation is necessary. The recommended
operating conditions do not imply that the device can be used with all values at their maximum values.
Data Sheet G13567EJ3V0DS00
5
µ
µ
PC1934
µ µ
Electrical Characteristics (unless otherwise specified, TA = 25
°°°°
C, VCC
====
3 V, f
OSC
= 100 kHz)
Block Parameter Symbol Conditions MIN. TYP. MAX. Unit
Under
voltage
Lock-out
section
Reference
Voltage
section
Start-up voltage V
Operation stop voltage V
Hysteresis voltage V
Reset voltage (timer latch) V
Reference voltage V
Line regulation REG
Load regulation REG
Temperature coefficient
OSC
f
setting accuracy
section
Dead time
control
section
Error
Amplifier
section
OSC
f
total stabilit y
Input bias current I
Low-level threshold voltage V
High-level threshold voltage V
Input offset voltage V
Input offset current I
Input bias current I
Common mode input voltage range V
Open loop gain A
Unity gain f
Maximum output voltage (+)
Maximum output voltage (−)
Output sink current I
Output source current I
Output
section
Drain cutoff current I
Output ON voltage V
Rise time t
Fall time t
Short-circuit
Protection
section
Input sense voltage V
UV sense voltage V
Source current on short-circuiting I
Delay time t
Overall Circuit operation current I
CC (L-H)IREF
CC (H-L)IREF
H
CCR
REF
IN
L
REF
∆
/∆T−20 °C≤T
V
OSC
∆
f
OSC
∆
f
BD
TH (L)
TH (H)
IO
IO
B
IMC
v
unity
+
OM
V
−
OM
V
Osink
Osource
LEAK
OL
r
f
TH
UV
OUV
DLY
CC
= 0.1 mA 1.57 V
= 0.1 mA 1.5 V
REF
I
= 0.1 mA 30 70 mV
REF
I
= 0.1 mA 1.0 V
REF
I
= 1 mA 2.0 2.1 2.2 V
CC
≤
2.5 V≤V
0.1 mA≤I
RT = 11 kΩ, CT = 330 pF
−
20 °C≤T
2.5 V≤V
20 V 2 12.5 mV
REF
≤
1 mA 2 7.5 mV
A
≤+
A
≤+
CC
≤
20 V
85 °C, I
85 °C,
REF
= 0 A 0.5 %
−
15
−
30
+
15 %Oscillation
+
30 %
0.4 1.0
Duty = 100 % 1.2 V
Duty = 0 % 1.6 V
−
−
−
100
100
10
+
10 mV
+
100 nA
+
100 nA
00.4V
VO = 0.3 V 70 80 dB
VO = 0.3 V 1.5 MHz
IO = −45 µA1.62V
IO = 45 µA 0.02 0.5 V
VFB = 0.5 V 0.8 1.4 mA
VFB = 1.6 V
−
70
−
45
VO = 30 V 100
RL = 150
RL = 150
RL = 150
Ω
Ω
Ω
0.2 0.6 V
50 ns
60 ns
0.5 0.63 0.75 V
0.6 0.8 0.95 V
1.0 1.6 2.5
DLY
C
= 0.1 µF50ms
VCC = 3 V 1.4 2.2 3.7 mA
µ
A
µ
A
µ
A
µ
A
Caution Connect a capacitor of 0.01 to 10
PC1934
µ
6
µ
µ
F to the V
µ µ
REF
pin.
16
8
Data Sheet G13567EJ3V0DS00
C
REF
= 0.01 to 10 F
µ
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