CS5158 Cherry Semiconductor Corporation, CS5158 Datasheet - Page 4

• Manufacturer Part Number: CS5158
• Description: CPU 5-Bit Synchronous Buck Controller
• Manufacturer: Cherry Semiconductor Corporation

Note 1: Guaranteed by design, not 100% tested in production.
Electrical Characteristics:
PWM Comparator
Transient Response
V
Supply Current
I
I
Operating I
Operating I
C
Normal Charge Time
Extension Charge Time
Discharge Current
Time Out Timer
Time Out Time
Fault Mode Duty Cycle
CC1
CC2
FFB
OFF
16L SO Narrow
PACKAGE PIN #
No Switching
No Switching
Bias Current
PARAMETER
1,2,3,4,6
= V
10
5
7
8
9
CC1
CC2
ID0
= 1; V
ID3
= 0; CV
0°C < T
V
PIN SYMBOL
V
ID0
GATE(H)
C
V
GATE(L)
V
A
SS
OFF
CC2
FFB
– V
< +70°C; 0°C < T
V
V
V
V
V
V
V
C
V
Record V
V
FFB
CC1
FFB
FB
FB
FFB
SS
OFF
FB
FFB
ID4
= V
= COMP = V
= COMP = V
= V
and CV
= 0V
= 0 to 5V to V
= 1.5V; V
= 0V
= V
to 5V; V
TEST CONDITIONS
FFB
COMP
CC2
GATE(H)
= 0
GATE(H)
= 12V
Package Pin Description
; V
Voltage ID DAC input pins. These pins are internally pulled up to 5V
providing logic ones if left open. V
is High (logic one), the DAC range is 2.10V to 3.50V with 100mV incre-
ments. When V
with 50mV increments. V
age. Leaving all 5 DAC input pins open results in a DAC output voltage
of 1.2440V, allowing for adjustable output voltage, using a traditional
resistor divider.
Soft Start Pin. A capacitor from this pin to LGnd in conjunction with
internal 60µA current source provides soft start function for the con-
troller. This pin disables fault detect function during Soft Start. When a
fault is detected, the soft start capacitor is slowly discharged by internal
2µA 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 1.5A peak switching current. Internal cir-
cuit prevents V
ously.
FB
SS
J
FFB
>1V
< +85°C; 8V < V
= 5V
Pulse High Duration
FFB
FFB
GATE(H)
= 1nF; C
= 2V;
4
= 9V to 1V;
OFF
GATE(H)
ID4
= 330pF; C
CC1
is Low (logic zero), the DAC range is 1.30V to 2.05V
< 14V; 5V < V
and V
ID0
SS
FUNCTION
- V
= 0.1µF, unless otherwise specified.
GATE(L)
MIN
ID4
1.0
5.0
5.0
10
35
CC2
ID4
select the desired DAC output volt-
from being in high state simultane-
< 14V; DAC Code: V
selects the DAC range. When V
TYP
100
0.3
8.5
1.6
1.6
8.0
30
50
8
2
MAX
13.5
11.0
125
3.0
2.2
13
50
65
5
ID4
= V
ID2
UNIT
mA
mA
mA
mA
mA
µA
ns
µs
µs
µs
%
= V
ID4
ID1