cs5157h ON Semiconductor, cs5157h Datasheet - Page 5

• Manufacturer Part Number: cs5157h
• Description: Cpu 5-bit Synchronous Buck Controller
• Manufacturer: ON Semiconductor

ELECTRICAL CHARACTERISTICS
V
PACKAGE PIN DESCRIPTION
Supply Current
C
Time Out Timer
I
I
Operating I
Operating I
Normal Charge Time
Extension Charge Time
Discharge Current
Time Out Time
Fault Mode Duty Cycle
ID4
CC1
CC2
PACKAGE PIN #
OFF
= V
1, 2, 3, 4, 6
SOIC−16
ID2
10
12
13
14
15
16
11
5
7
8
9
= V
Characteristic
CC1
CC2
ID1
= V
ID0
PIN SYMBOL
= 1; V
V
V
V
ID0
COMP
PGND
LGND
GATE(H)
GATE(L)
C
V
V
V
V
SS
OFF
CC2
CC1
FFB
−V
ID3
FB
ID4
= 0
;
CV
(0°C < T
GATE(L)
No Switching
No Switching
V
V
V
V
C
V
Record V
V
Voltage ID DAC input pins. These pins are internally pulled up to 5.0 V providing logic ones if left
open. V
3.50 V with 100 mV increments. When V
2.05 V with 50 mV increments. V
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.
Soft−Start Pin. A capacitor from this pin to LGND in conjunction with internal 60 mA current
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 discharged by
internal 2.0 mA 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.
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.
Fast feedback connection to the PWM comparator. This pin is connected to the regulator output.
The inner feedback loop terminates on time.
Boosted power for the high side gate driver.
High FET driver pin capable of 1.5 A peak switching current. Internal circuit prevents V
and V
High current ground for the IC. The MOSFET driver is referenced to this pin. Input capacitor
ground and the source of lower FET should be tied to this pin.
Low FET driver pin capable of 1.5 A peak switching current.
Input power for the IC and low side gate driver.
Signal ground for the IC. All control circuits are referenced to this pin.
Error amplifier compensation pin. A capacitor to ground should be provided externally to
compensate the amplifier.
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.
FB
FB
FFB
SS
FB
FFB
OFF
= COMP = V
= COMP = V
= V
= V
= 1.5 V; V
= 0V
to 5.0 V; V
GATE(L)
A
and CV
COMP
ID4
FFB
< +70°C; 0°C < T
GATE(H)
selects the DAC range. When V
= 0
; V
from being in high state simultaneously.
GATE(H)
SS
FFB
FB
Test Conditions
FFB
FFB
Pulse High Duration
http://onsemi.com
= 5.0 V
> 1.0 V
= 2.0 V;
= 1.0 nF; C
CS5157H
J
< +125°C; 8.0 V < V
5
OFF
ID0
− V
= 330 pF; C
ID4
ID4
FUNCTION
ID4
select the desired DAC output voltage. Leaving all
is Low (logic zero), the DAC range is 1.30 V to
CC1
is High (logic one), the DAC range is 2.10 V to
SS
< 14 V; 5.0 V < V
= 0.1 mF, unless otherwise specified.)
Min
1.0
5.0
5.0
10
35
−
−
−
−
CC2
Typ
8.5
1.6
8.0
2.0
1.6
8.0
30
50
−
< 20 V;DAC Code:
Max
13.5
11.0
3.0
5.0
2.2
13
65
70
−
GATE(H)
Unit
mA
mA
mA
mA
mA
ms
ms
ms
%