UNISONIC TECHNOLOGIES CO., LTD
P1696
150KHZ, 2A PWM STEP-DOWN
DC/DC CONVERTER
DESCRIPTION
The UTC
P1696
series is a step-down switching regulator able
to provide
2A
output current. The available output voltages are
2.5V 3.3V, 5V, 12V, and an adjustable
output version.
LINEAR INTEGRATED CIRCUIT
SOP-8
FEATURES
*Output load current:
2A
*Adjustable version output voltage range, 1.23V ~ 27.5V±4%
*Operating voltage can be up to
30V
(V
IN
->30V)
*Low power standby mode
*High efficiency
*Internal current and thermal limit
*Pb-free plating product number:P1696L
ORDERING INFORMATION
Order Number
Normal
Lead Free Plating
P1696-xx-S08-R
P1696L-xx-S08-R
P1696-xx-S08-T
P1696L-xx-S08-T
Package
SOP-8
SOP-8
Packing
Tape Reel
Tube
P1696L-xx-S08-R
(1)Packing Type
(2)Package Type
(3)Output Voltage Code
(4)Lead Plating
(1) R: Tape Reel, T: Tube
(2) S08: SOP-8
(3) xx:
2 5 :2 . 5 V, 3 3 : 3 .3 V ,5 0 : 5 . 0 V, 1 2 :1 2 V ,AD :AD J
(4) L: Lead Free Plating, Blank: Pb/Sn
PIN DESCRIPTION
PIN NO.
1
2
3
4
5,6,7,8
PIN NAME
V
IN
Output
FB (Feedback)
SD (Shutdown)
GND
DESCRIPTION
Operating voltage input
Switching output
Output voltage feedback control
ON/OFF shutdown
Circuit Ground
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QW-R103-035,B
P1696
BLOCK DIAGRAM
ON / OFF
LINEAR INTEGRATED CIRCUIT
V
IN
Current
Source
bias
1.235V
Reference
2.5V
Regulator
Start
up
+
Comp
-
-
Comp
+
FB
+
Amp
-
Frequency
Compe-
nsation
-
Comp
+
Pre-driver
2A
Switch
Output
150kHz
OSC.
Thermal
Shutdown
Gnd
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QW-R103-035,B
P1696
ABSOLUTE MAXIMUM RATINGS
LINEAR INTEGRATED CIRCUIT
PARAMETER
SYMBOL
RATINGS
UNIT
Maximum Supply Voltage
V
CC
40
V
Operating Voltage
V
OPR
3.8 ~ 30
V
ON/OFF Pin Input Voltage
V
ON/OFF
-0.3 ~ +25
V
Feedback Pin Voltage
V
FB
-0.3 ~ +25
V
Output Voltage to Ground (Steady State)
V
OUT
-1
V
Power Dissipation
P
D
Internally limited
mW
Junction Temperature
T
J
+150
℃
Operating Temperature
T
OPR
-40 ~ +125
℃
Storage Temperature
T
STG
-40 ~ +150
℃
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
ELECTRICAL CHARACTERISTICS
(T
J
=25
℃
, V
IN
=12V for the 2.5V 3.3V, 5V, and Adjustable version and V
IN
=24V for the 12V version, I
LOAD
=500mA.)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX UNIT
2.5V
3.8V
≦
V
IN
≦
30V, 0.2A
≦
I
LOAD
≦
2A
V
2.4
2.5
2.6
3.3V
4.75V
≦
V
IN
≦
30V, 0.2A
≦
I
LOAD
≦
2A
3.168
3.3
3.432
V
Output Voltage
V
OUT
5.0V
7V
≦
V
IN
≦
30V, 0.2A
≦
I
LOAD
≦
2A
4.8
5.0
5.2
V
12V
15V
≦
V
IN
≦
30V, 0.2A
≦
I
LOAD
≦
2A
11.52
12.0
12.48
V
2.5V
V
IN
=12V, I
LOAD
=2A
%
73
3.3V
V
IN
=12V, I
LOAD
=2A
75
%
Efficiency
η
5.0V
V
IN
=12V, I
LOAD
=2A
80
%
12V
80
%
V
IN
=25V, I
LOAD
=2A
UTC P1696-ADJ
4.5V
≦
V
IN
≦
30V, 0.2A
≦
I
LOAD
≦
2A
1.19
1.230 1.267
V
Feedback Voltage
V
FB
V
OUT
programmed for 3V
Efficiency
η
V
IN
=12V, V
OUT
=3V, I
LOAD
=2A
%
75
ALL OUTPUT VOLTAGE
Feedback Bias Current
I
BIAS
Adjustable Version Only, V
FB
=1.3V
10
50
nA
Oscillator Frequency
f
OSC
(Note 1)
127
150
173
kHz
Saturation Voltage
V
SAT
I
OUT
=2A (Note 2, 3)
1.16
1.4
V
(Note 3)
100
Max Duty Cycle (ON)
DC
%
(Note 4)
0
Min Duty Cycle (OFF)
Current Limit
I
CL
Peak Current (Notes 2, 3)
2
A
Output=0V (Notes 2, 4)
µA
50
Output Leakage Current
I
L
Output=-1V (Note 5)
2
30
mA
Quiescent Current
I
Q
(Note 4)
5
10
mA
Standby Quiescent Current
I
STBY
ON/OFF pin=5V (OFF) (Note 5)
80
200
µA
ON/OFF CONTROL
ON/OFF Pin Logic Input
V
IH
Low (Regulator ON)
1.3
0.6
V
Threshold Voltage
V
IL
High (Regulator OFF)
2.0
1.3
V
ON/OFF Pin Input Current
I
H
V
LOGIC
=2.5V (Regulator OFF)
5
15
µA
I
L
V
LOGIC
=0.5V (Regulator ON)
0.02
5
µA
Note 1: The switching frequency is reduced when the second stage current limit is activated.
2: No diode, inductor or capacitor connected to output pin.
3: Feedback pin removed from output and connected to 0V to force the output transistor switch ON.
4: Feedback pin removed from output and connected to 12V for the 2.5V 3.3V, 5V, and the ADJ. version, and
15V for the 12V version, to force the output transistor switch OFF.
5: V
IN
= 30V
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QW-R103-035,B
P1696
TYPICAL APPLICATION
(Fixed Output Voltage Versions)
LINEAR INTEGRATED CIRCUIT
FB
12V
DC Input
V
IN
+
C
IN
Capacitor
1
3
UTC
P1696 -5.0V
4
on / off
Output
L1
Inductor
+
D1
Schottky Diode
Co
Capacitor
5.0V/2A
Output Load
2
5,6,7,8
Gnd
ADJUSTABLE OUTPUT VOLTAGE VERSIONS
C
FF
R1
1k
+
UNREGULATED
+
DC INPUT
R2
Locate The Programming Resistors Near The
Feedback Pin Using Short Leads
Keep Feedback Wiring Away From
Inductor Flux
Output
2
ON/OFF
3 Feedback
L1
D1
+V
IN
P 1696-ADJ
1
5,6,7,8 GND
4
C
IN
Regulated Output
+
L
O
C
OUT
A
D
Heavy Lines Must be Kept Short and Use Ground Plane
Construction for Best Results
V
OUT
×(
R1
R1 + R2
) = V
REF
V
OUT
= V
REF
(1+
R2
R1
)
Where V
REF
= 1.23V
R2 = R1(
V
OUT
V
REF
-1)
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QW-R103-035,B
P1696
TYPICAL CHARACTERISTICS
Normalized Output Voltage
5.15
V
IN
=20V,L
LOAD
=2A
Normalized at T
J
=25
℃
5.10
LINEAR INTEGRATED CIRCUIT
Line Regulation
5.15
5.10
V
OUT
=5V, I
LOAD
=100mA
Normalized at T
J
=25℃
Output Voltage (V)
Output Voltage (V)
5.05
5.05
5.00
4.95
5.00
4.95
4.90
4.85
4.90
4.85
-50
-25
0
25
50
75
100
125
0
5
10
15
20
25
30
Junction Temperature (℃)
Input Voltage (V)
Efficiency
90
2A Load
1.60
1 : -40
℃
2 : 25
℃
3 : 125℃
Switch Saturation Voltage
85
5.0V
Saturation Voltage (V)
1.40
80
Efficiency (%)
1.20
75
3.3V
70
1.00
1
2
3
65
60
0
5
10
15
20
25
30
0.80
0.60
0
0.5
1
2
Switch Current(A)
3
Input Voltage (V)
Switch Current Limit
5.00
V
IN
=12V, V
OUT
=5V
4.75
Switch Current Limit (A)
Operating Quiescent Current
30.0
4.5V< V
IN
< 30V
I
SWITCH
=0
25.0
Supply Current (mA)
4.50
20.0
Switch ON
15.0
4.25
4.00
10.0
Switch OFF
5.00
0.00
3.75
3.50
-50
-25
0
25
50
75
100
125
-50
-25
0
25
50
75
100
125
Junction Temperature (℃)
Junction Temperature (℃)
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