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CS5159 Datasheet(PDF) 5 Page - ON Semiconductor

Part # CS5159
Description  CPU 5?묪it Synchronous Buck Controller
Download  16 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CS5159 Datasheet(HTML) 5 Page - ON Semiconductor

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CS5159
http://onsemi.com
5
ELECTRICAL CHARACTERISTICS (continued) (0°C < TA < +70°C; 0°C < TJ < +85°C; 8.0 V < VCC1 < 14 V; 5.0 V < VCC2 < 18 V; DAC
Code: VID4 = VID2 = VID1 = VID0 = 1; VID3 = 0; CVGATE(L) and CVGATE(H) = 1.0 nF; COFF = 330 pF; CSS = 0.1 μF, unless otherwise specified.)
Characteristic
Unit
Max
Typ
Min
Test Conditions
Supply Current
ICC1
No Switching
8.5
13.5
mA
ICC2
No Switching
1.6
3.0
mA
Operating ICC1
VFB = COMP = VFFB
8.0
13
mA
Operating ICC2
VFB = COMP = VFFB
2.0
5.0
mA
COFF
Normal Charge Time
VFFB = 1.5 V; VSS = 5.0 V
1.0
1.6
2.2
μs
Extension Charge Time
VSS = VFFB = 0
5.0
8.0
11.0
μs
Discharge Current
COFF to 5.0 V; VFB > 1.0 V
5.0
mA
Time Out Timer
Time Out Time
VFB = VCOMP; VFFB = 2.0 V;
Record VGATE(H) Pulse High Duration
10
30
65
μs
Fault Mode Duty Cycle
VFFB = 0V
35
50
70
%
PACKAGE PIN DESCRIPTION
PACKAGE PIN #
PIN SYMBOL
FUNCTION
SO−16
1, 2, 3, 4, 6
VID0−VID4
Voltage ID DAC input pins. These pins are internally pulled up to 5.0 V providing logic
ones if left open. VID4 selects the DAC range. When VID4 is High (logic one), the DAC
range is 2.10 V to 3.50 V with 100 mV increments. When VID4 is Low (logic zero), the
DAC range is 1.30 V to 2.05 V with 50 mV increments. VID0 − VID4 select the desired
DAC output voltage. Leaving all 5 DAC input pins open results in a DAC output voltage
of 1.2440 V, allowing for adjustable output voltage, using a traditional resistor divider.
5
SS
Soft Start Pin. A capacitor from this pin to LGND in conjunction with internal 60 μA cur-
rent source provides Soft Start function for the controller. This pin disables fault detect
function during Soft Start. When a fault is detected, the Soft Start capacitor is slowly dis-
charged by internal 2.0 μA current source setting the time out before trying to restart the
IC. Charge/discharge current ratio of 30 sets the duty cycle for the IC when the regulator
output is shorted.
7
COFF
A capacitor from this pin to ground sets the time duration for the on board one shot,
which is used for the constant off time architecture.
8
VFFB
Fast feedback connection to the PWM comparator. This pin is connected to the regulator
output. The inner feedback loop terminates on time.
9
VCC2
Boosted power for the high side gate driver.
10
VGATE(H)
High FET driver pin capable of 1.5 A peak switching current. Internal circuit prevents
VGATE(H) and VGATE(L) from being in high state simultaneously.
11
PGND
High current ground for the IC. The MOSFET driver is referenced to this pin. Input capac-
itor ground and the source of lower FET should be tied to this pin.
12
VGATE(L)
Low FET driver pin capable of 1.5 A peak switching current.
13
VCC1
Input power for the IC and low side gate driver.
14
LGND
Signal ground for the IC. All control circuits are referenced to this pin.
15
COMP
Error amplifier compensation pin. A capacitor to ground should be provided externally to
compensate the amplifier.
16
VFB
Error amplifier DC feedback input. This is the master voltage feedback which sets the
output voltage. This pin can be connected directly to the output or a remote sense trace.


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