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Part Number AMS34063

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Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
Advanced
AMS34063
Monolithic
DC-TO-DC CONVERTER CONTROL CIRCUIT
Systems
FEATURES
APPLICATIONS
·
·
Wide Input Voltage Operating Range from 2.5V to 40V
·
·
Step-Up Converter
·
·
Low Standby Current
·
·
Step-Down Converter
·
·
Current Limiting
·
·
Voltage Inverting Application
·
·
Output Switch Current of 1.5A
·
·
Output Voltage Adjustable from 1.25 to 40V
·
·
Frequency of Operation to 100kHz
GENERAL DESCRIPTION
The AMS34063 series is a control circuit containing the basic functions required for DC-to-DC converters. The device consists
of an internal temperature compensated reference, a comparator, a controlled duty cycle oscillator with an active current limit
circuit, a driver and a high current output switch. Designed specifically to be incorporated in Step-Up, Step-Down and Voltage
-Inverting applications, the AMS34063 requires a minimum number of external components.
The AMS34063 is available in the 8-lead plastic SOIC and 8-lead plastic DIP packages.
ORDERING INFORMATION
PACKAGE TYPE
OPER. TEMP
8 LEAD PDIP
8 LEAD SOIC
RANGE
AMS34063P
AMS34063S
-40
°
C to +85
°
C
PIN CONNECTIONS
8 LEAD SOIC/ 8 LEAD PDIP
Top View
COMPARATOR
INVERTING
INPUT
SWITCH
COLLECTOR
GND
DRIVER
COLLECTOR
TIMING
CAPACITOR
V
CC
I
PK
SENSE
SWITCH
EMITTER
1
2
8
4
3
7
5
6
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS34063
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Power Supply Voltage, V
CC
40V
Driver Collector Voltage, V
C(driver)
40V
Comparator Input Voltage Range, V
IR
-0.3V to
+40V
Switch Current, I
SW
1.5A
Switch Collector Voltage, V
C(switch)
40V
Power Dissipation
(Note 3)
Switch Emitter Voltage, V
E(switch)
40V
Maximum Junction Temperature
+125
°
C
Switch Collector to Emitter Voltage, V
CE(switch)
40V
Storage Temperature
-65
°
C to +150
°
C
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at V
CC
= 5.0V, -40
°
C
T
A
+85
°
C, unless otherwise noted.
PARAMETER
CONDITIONS
Min.
AMS34063
Typ.
Max.
Units
Oscillator
Charging Current
5.0V
V
CC
40V, T
A
= 25
°
C
20
35
50
µ
A
Discharge Current
5.0V
V
CC
40V, T
A
= 25
°
C
150
200
250
µ
A
Voltage Swing
T
A
= 25
°
C
0.5
V
P-P
Discharge to Charge Current
Ratio
I
PK(sense)
= V
CC
, T
A
= 25
°
C
6.0
_
Current Limit Sense Voltage
I
CHG
= I
DISCHG
, T
A
= 25
°
C
250
300
350
mV
Output Switch (Note 2)
Saturation Voltage, Darlington
Connection
I
SW
= 1.0A, V
C(driver)
= V
C(switch)
1.0
1.3
V
Saturation Voltage
I
SW
= 1.0A, I
C(driver)
= 50mA, (Forced
20)
0.45
0.7
V
DC Current Gain
I
SW
= 1.0A, V
CE
= 5.0V, T
A
= 25
°
C
35
120
Collector Off-State Current
V
CE
= 40V, T
A
= 25
°
C
10
nA
Comparator
Threshold Voltage
1.18
1.25
1.32
V
Threshold Voltage Line
Regulation
3.0V
V
CC
40V
0.04
0.2
mV/V
Input Bias Current
V
IN
= 0V
40
400
nA
Total Device
Supply Current
5.0V
V
CC
40V, I
PK(sense)
= V
CC
,
C
T
= 0.001
µ
F, V pin 5 > V
th
,
Pin 2 = Gnd, Remaining pins open
2.4
3.5
mA
Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. For guaranteed performance limits and associated test
conditions, see the Electrical Characteristics tables.
Note 2: To minimize power dissipation, low duty cycle pulse testing is used.
Note 3: Power dissipation at T
A
= 25
°
C is equal to 1.0W for the 8 lead P DIP package and 625mW for the SO-8 package. For operation at temperatures above
T
A
= 25
°
C derate the power dissipation at 10mW/
°
C.
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS34063
FUNCTIONAL BLOCK DIAGRAM
TYPICAL PERFORMANCE CHARACTERISTICS
OSCILLATOR TIMING CAPACITOR
OUTPUT SWITCH ON-OFF TIME (
µ
s)
1.0
1000
Output Switch On-Off Time vs
Oscillator Timing Capacitor
10
10
100
0.1
1.0
100
0
0.8
3.2
0
5.0
10
15
20
25
30
35
40
SUPPLY VOLTAGE (V)
Standby Supply Current vs
Supply Voltage
SUPPLY CURRENT (mA)
1.6
2.4
V
CC
= 5.0V
I
PK(sense)
= V
CC
Pin 5 = GND
C
T
= 0.001
µ
F
I
PK(sense)
= V
CC
Pin 2 = GND
Emitter-Follower Configuration
Output Switch Saturation Voltage
vs Emitter Current
EMITTER CURRENT (A)
SATURATION VOLTAGE (V)
0
0.2 0.4 0.6
0.8
1.0
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.2 1.4
V
CC
= 5.0V
Pins 1,7,8 = V
CC
Pin 3,5 = GND
Common-Emitter Configuration
Output Switch Saturation Voltage
vs Collector Current
COLLECTOR CURRENT (A)
SATURATION VOLTAGE (V)
0
0.2 0.4 0.6
0.8
1.0
0
0.2
0.4
0.6
0.8
1.0
1.2
1.2 1.4
V
CC
= 5.0V
Pin 7 = V
CC
Pin 2,3,5 = GND
Darlington Connection
Forced Beta
20
1.25V
REF
REG
8
7
6
5
+
-
4
1
2
3
COMP.
I
PK
C
T
OSC
R
S
Q
Q
2
Q
1
170
SWITCH
COLLECTOR
SWITCH
EMITTER
TIMING
CAPACITOR
GND
DRIVE
COLLECTOR
I
PK
SENSE
V
CC
COMPARATOR
INVERTING
INPUT
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS34063
TYPICAL APPLICATIONS
Step-Down Converter
Test
Conditions
Results
Line Regulation
V
IN
= 15 to 25V, I
O
= 500mA
15mV
Load Regulation
V
IN
= 25V, I
O
= 50 to 500mA
5.0mV
Output Ripple
V
IN
= 25V, I
O
= 500mA
40 mV
P-P
Short Circuit Current
V
IN
= 25V, R
L
= 0.1
2.3A
Efficiency
V
IN
= 25V, I
O
= 500mA
84.7%
External Current Boost Connections for I
C
Peak Greater than 1.5A
a. External NPN Switch
b. External PNP Saturated Switch
1.25V
REF
REG
8
7
6
5
+
-
+
C
O
V
OUT
5.0V/500mA
470
µ
F
470
pF
C
T
100
µ
F
+
4
1
2
3
COMP.
I
PK
C
T
OSC
R
S
Q
Q
2
Q
1
1N5822
L
220
µ
H
R
2
R
1
1.2 k
3.6 k
R
SC
0.33
V
IN
25V
8
7
6
V
OUT
1
2
R
SC
V
IN
8
7
6
1
2
R
SC
V
IN
V
OUT
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS34063
TYPICAL APPLICATIONS (Continued)
Step-Up Converter
Test
Conditions
Results
Line Regulation
V
IN
= 8 to 16V, I
O
= 175 mA
12 mV
Load Regulation
V
IN
= 12V, I
O
= 75 to 175 mA
5.0 mV
Output Ripple
V
IN
= 12V, I
O
= 175 mA
40 mV
P-P
Short Circuit Current
V
IN
= 12V, R
L
= 0.1
2.3A
Efficiency
V
IN
= 12V, I
O
= 175 mA
84.7%
External Current Boost Connections for I
C
Peak Greater than 1.5A
a. External NPN Switch
b. External NPN Saturated Switch
8
7
6
V
OUT
1
2
R
SC
V
IN
18
0
8
7
6
V
OUT
1
2
R
SC
V
IN
180
R 0 for
constant V
IN
1.25V
REF
REG
8
7
6
5
+
-
+
C
O
V
OUT
28V/175mA
150
µ
F
1500
pF
C
T
100
µ
F
+
4
1
2
3
COMP.
I
PK
C
T
OSC
R
S
Q
Q
2
Q
1
1N5819
R
2
R
1
2.2 k
47 k
R
SC
0.22
V
IN
12V
L
170
µ
H
180