ADMOS AMS34063S, AMS34063P Datasheet
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
AMS34063P AMS34063S
RANGE
-40°C to +85°C
PIN CONNECTIONS
8 LEAD SOIC/ 8 LEAD PDIP
SWITCH
COLLECTOR
SWITCH
EMITTER
TIMING
CAPACITOR
GND
1
2
3
4
DRIVER
8
COLLECTOR
IPK SENSE
7
V
6
CC
COMPARATOR
5
INVERTING
INPUT
Top View
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
ABSOLUTE MAXIMUM RATINGS (Note 1)
Power Supply Voltage, V
Comparator Input Voltage Range, V
Switch Collector Voltage, V
Switch Emitter Voltage, V
CC
IR
C(switch)
E(switch)
Switch Collector to Emitter Voltage, V
-0.3V to +40V Switch Current, I
CE(switch)
40V Driver Collector Voltage, V
40V Power Dissipation (Note 3)
40V Maximum Junction Temperature
40V Storage Temperature
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at VCC = 5.0V, -40°C ≤TA ≤+85°C, unless otherwise noted.
SW
C(driver)
AMS34063
40V
1.5A
+125°C
-65°C to +150°C
PARAMETER CONDITIONS
Min.
Oscillator
Charging Current
Discharge Current
Voltage Swing
Discharge to Charge Current
Ratio
Current Limit Sense Voltage
Output Switch (Note 2)
Saturation Voltage, Darlington
Connection
Saturation Voltage
DC Current Gain
Collector Off-State Current
Comparator
Threshold Voltage 1.18 1.25 1.32 V
Threshold Voltage Line
Regulation
Input Bias Current VIN = 0V 40 400 nA
Total Device
Supply Current
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 TA = 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
TA = 25°C derate the power dissipation at 10mW/°C.
5.0V ≤ VCC ≤ 40V, TA= 25°C
5.0V ≤ VCC ≤ 40V, TA= 25°C
TA= 25°C
I
= VCC, TA= 25°C
PK(sense)
I
= I
CHG
ISW = 1.0A, V
ISW = 1.0A, I
ISW = 1.0A, V
V
CE
3.0V ≤ VCC ≤ 40V
5.0V ≤ VCC ≤ 40V, I
CT = 0.001µF, V pin 5 > Vth,
Pin 2 = Gnd, Remaining pins open
, TA= 25°C
DISCHG
C(driver)
= 50mA, (Forced β ≈ 20)
C(driver)
= 5.0V, TA= 25°C
CE
= 40V, TA= 25°C
= V
PK(sense)
C(switch)
= VCC ,
20 35 50
150 200 250
250 300 350 mV
AMS34063
Typ.
0.5 V
6.0 _
1.0 1.3 V
0.45 0.7 V
35 120
10 nA
0.04 0.2 mV/V
2.4 3.5 mA
Max.
Units
µA
µA
P-P
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
FUNCTIONAL BLOCK DIAGRAM
AMS34063
8
DRIVE
COLLECTOR
S
R
V
INPUT
7
I
PK
OSC
6
CC
+
COMP.
-
5
IPK SENSE
COMPARATOR
INVERTING
TYPICAL PERFORMANCE CHARACTERISTICS
Output Switch On-Off Time vs
Oscillator Timing Capacitor
1000
VCC = 5.0V
I
= V
PK(sense)
CC
Pin 5 = GND
100
Q Q
C
T
1
SWITCH
2
170
1.25V
REF
REG
COLLECTOR
Q
1
2
SWITCH
EMITTER
3
TIMING
CAPACITOR
4
GND
Standby Supply Current vs
Supply Voltage
3.2
CT= 0.001µF
I
= V
PK(sense)
CC
Pin 2 = GND
2.4
10
OUTPUT SWITCH ON-OFF TIME (µs)
1.0
0.1 1.0
OSCILLATOR TIMING CAPACITOR
Emitter-Follower Configuration
Output Switch Saturation Voltage
vs Emitter Current
1.6
VCC = 5.0V
1.5
Pins 1,7,8 = V
Pin 3,5 = GND
CC
1.4
1.3
1.2
1.1
SATURATION VOLTAGE (V)
1.0
0.2 0.4 0.6 0.8 1.0
0
EMITTER CURRENT (A)
10
1.2 1.4
100
1.6
0.8
SUPPLY CURRENT (mA)
0
0 5.0 10 15 20 25 30 35 40
SUPPLY VOLTAGE (V)
Common-Emitter Configuration
Output Switch Saturation Voltage
vs Collector Current
1.2
VCC = 5.0V
Pin 7 = V
1.0
0.8
0.6
CC
Pin 2,3,5 = GND
Forced Beta ≈20
Darlington Connection
0.4
0.2
SATURATION VOLTAGE (V)
0
0.2 0.4 0.6 0.8 1.0
0
COLLECTOR CURRENT (A)
1.2 1.4
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
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